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As filed with the Securities and Exchange Commission on June 23, 2009
Registration No. 333-      
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form S-3
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
 
ALTUS PHARMACEUTICALS INC.
(Exact name of registrant as specified in its charter)
 
     
Delaware
  04-3573277
(State or other jurisdiction
of incorporation or organization)
  (I.R.S. Employer
Identification Number)
 
610 Lincoln Street,
Waltham, Massachusetts
(781) 373-6000
(Address, including zip code, and telephone number, including area code of principal executive offices)
 
Georges Gemayel
President and Chief Executive Officer
Altus Pharmaceuticals Inc.
610 Lincoln Street,
Waltham, Massachusetts
(781) 373-6000
(Name, address, including zip code, and telephone number, including area code, of agent for service)
 
 
Please send copies of all communications to:
 
Paul Kinsella
Ropes & Gray LLP
One International Place
Boston, Massachusetts 02110
(617) 951-7000
 
Approximate date of commencement of proposed sale to the public:  From time to time after the effectiveness of the Registration Statement.
 
If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box:  o
 
If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box:  þ
 
If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  o
 
If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  o
 
If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  o
 
If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  o
 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):
 
Large accelerated filer o Accelerated filer þ Non-accelerated filer o Smaller reporting company o
(Do not check if a smaller reporting company)
 
 
CALCULATION OF REGISTRATION FEE(1)
 
             
      Proposed Maximum
    Amount of
Title of Each Class of
    Aggregate
    Registration
Securities to be Registered     Offering Price(1)(2)     Fee(2)
Common Stock, $.01 par value per share(3)
           
Preferred Stock(4)
           
Warrants(5)
           
Debt securities(6)
           
Units(7)
           
Total
    $20,000,000(1)     $1,116
             
 
(1) In no event will the aggregate offering price of all securities issued from time to time by the registrant under this registration statement exceed $20,000,000 or its equivalent in any other currency, currency units, or composite currency or currencies. The securities covered by this registration statement may be sold separately, together, or as units with other securities registered under this registration statement.
 
(2) The proposed maximum aggregate price has been estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(o) under the Securities Act.
 
(3) Subject to note (1), this registration statement covers such an indeterminate amount of common stock (with accompanying purchase rights, if any), as may be sold, from time to time, at indeterminate prices, by the registrant.
 
(4) Subject to note (1), this registration statement covers such an indeterminate number of shares of preferred stock (with accompanying purchase rights, if any) as may be sold from time to time at indeterminate prices by the registrant. Also covered is such an indeterminate amount of common stock (with accompanying purchase rights, if any,) (i) as may be issuable or deliverable upon conversion of shares of preferred stock, and (ii) as may be required for delivery upon conversion of shares of preferred stock as a result of anti-dilution provisions.
 
(5) Subject to note (1), this registration statement covers such an indeterminate amount and number of warrants, representing rights to purchase common stock, preferred stock, debt securities, and other warrants registered under this registration statement as may be sold from time to time at indeterminate prices by the registrant. Also covered is such an indeterminate amount of common stock and preferred stock (in each case, with accompanying purchase rights, if any) and debt securities (i) as may be issuable or deliverable upon exercise of warrants, and (ii) as may be required for delivery upon exercise of any warrants as a result of anti-dilution provisions.
 
(6) Subject to note (1), this registration statement covers such an indeterminate amount of debt securities as may be sold from time to time at indeterminate prices by the registrant. If any debt securities are issued at an original issue discount, then the offering price shall be in such greater principal amount as shall result in an aggregate initial offering price not to exceed $20,000,000. Also covered is such an indeterminate amount of common stock and preferred stock (in each case, with accompanying purchase rights, if any) (i) as may be issuable or deliverable upon the exercise or conversion of debt securities, and (ii) as may be required for delivery upon exercise or conversion of debt securities as a result of anti-dilution provisions.
 
(7) Subject to note (1), consisting of some or all of the securities listed above, in any combination.
 
The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the Registration Statement shall become effective on such date as the Security and Exchange Commission, acting pursuant to said Section 8(a), may determine.
 


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Information contained in this prospectus is not complete and may be changed. These securities may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.
 
SUBJECT TO COMPLETION June 23, 2009
 
PROSPECTUS
 
$20,000,000
 
ALTUS PHARMACEUTICALS INC.
 
Common Stock
Preferred Stock
Warrants
Debt Securities
Units
 
 
 
 
We may offer to the public from time to time in one or more series or issuances:
 
  •  shares of our common stock;
 
  •  shares of our preferred stock;
 
  •  warrants to purchase shares of our common stock, preferred stock and/or debt securities;
 
  •  debt securities consisting of debentures, notes or other evidences of indebtedness; or
 
  •  units consisting of the combinations of the foregoing, including shares of our common stock and warrants.
 
This prospectus provides a general description of the securities we may offer. Each time we sell securities, we will provide specific terms of the securities offered in a supplement to this prospectus. The prospectus supplement may also add, update or change information contained in this prospectus. You should read this prospectus and the applicable prospectus supplement carefully before you invest in any securities. This prospectus may not be used to consummate a sale of securities unless accompanied by the applicable prospectus supplement. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information” before you make your investment decision.
 
We will sell these securities directly to our stockholders or to purchasers or through agents on our behalf or through underwriters or dealers as designated from time to time. If any agents or underwriters are involved in the sale of any of these securities, the applicable prospectus supplement will provide the names of the agents or underwriters and any applicable fees, commissions or discounts.
 
Our common stock is traded on the Nasdaq Global Market under the symbol “ALTU.” On June 19, 2009 the closing price of our common stock was $0.46.
 
Investing in our securities involves risks. See “Risk Factors” on page 3.
 
 
 
 
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.
 
 
 
 
 
The date of this prospectus is          , 2009


 

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 Ex-4.5 FORM OF INDENTURE
 Ex-5.1 OPINION OF ROPES & GRAY, LLP
 Ex-12.1 STATEMENT RE: COMPUTATION OF RATIOS
 Ex-23.2 CONSENT OF ERNST & YOUNG, LLP
 Ex-23.3 CONSENT OF DELOITTE & TOUCHE LLP
 EX-24.1 POWER OF ATTORNEY
 
You should rely only on the information contained in this prospectus. We have not authorized anyone to give you information different from that contained in this prospectus. We are not making an offer to sell these securities in any jurisdiction where the offer is not permitted. The information contained in this prospectus is accurate only as of the date on the front cover of this prospectus, regardless of when this prospectus is delivered or when any sale of our securities occurs. Our business, financial condition, results of operations and prospects may have changed since that date.


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ABOUT THIS PROSPECTUS
 
This prospectus is a part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a “shelf” registration process. Under this shelf registration process, we may offer to sell any combination of the securities described in this prospectus in one or more offerings up to a total dollar amount of $20,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities under this shelf registration, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement, including all documents incorporated herein by reference, together with additional information described under “Where You Can Find More Information.”
 
We have not authorized any dealer, salesman or other person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus and any accompanying prospectus supplement. You must not rely upon any information or representation not contained or incorporated by reference in this prospectus or an accompanying prospectus supplement. This prospectus and the accompanying prospectus supplement, if any, do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor do this prospectus and the accompanying prospectus supplement constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction. You should not assume that the information contained in this prospectus and the accompanying prospectus supplement, if any, is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the document incorporated by reference, even though this prospectus and any accompanying prospectus supplement is delivered or securities are sold on a later date.
 
Prior to filing the registration statement of which this prospectus is a part, our agent contacted a limited number of accredited investors regarding the possibility of conducting a private placement of our securities. The possible private placement would have sought to raise approximately $3 million to $5 million in gross proceeds through the sale of shares of common stock and warrants. We did not accept any offers to buy our securities, and none of our securities were sold in the possible private placement. We instructed our agent to terminate all offering activity related to the possible placement on June 16, 2009. This prospectus supersedes any offering materials used in those discussions.
 
Unless the context otherwise requires, “Altus,” “the Company,” “we,” “us,” “our” and similar names refer to Altus Pharmaceuticals Inc. and our subsidiary.


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OUR COMPANY
 
We are a biopharmaceutical company focused on the development and commercialization of oral and injectable protein therapeutics for gastrointestinal and metabolic disorders, with product candidates in clinical development. We are using our proprietary protein crystallization technology to develop protein therapies that we believe will have significant advantages over existing products and will address unmet medical needs. Our product candidates are designed to either increase the amount of a protein that is in short supply in the body or degrade and remove toxic metabolites from the blood stream. We are currently focusing our efforts on ALTU-238 for the treatment of growth hormone deficiency, for which we completed a Phase II clinical trial in adults and have begun a Phase II clinical trial in pediatric patients. Our next most advanced product candidate is ALTU-237, for which we have completed a Phase I clinical trial for the treatment of hyperoxalurias. We also have a pipeline of other product candidates in preclinical research and development.
 
Our principal executive offices are located at 610 Lincoln Street, Waltham, Massachusetts, and our telephone number is (781) 373-6000.


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RISK FACTORS
 
Investing in our securities involves a high degree of risk. The prospectus supplement applicable to each offering of our securities will contain a discussion of the risks applicable to an investment in the Company. Prior to making a decision about investing in our securities, you should carefully consider the specific factors discussed under the heading “Risk Factors” in the applicable prospectus supplement, together with all of the other information contained or incorporated by reference in the prospectus supplement or appearing or incorporated by reference in this prospectus. You should also consider the risks, uncertainties and assumptions discussed under the heading “Risk Factors” included in our most recent quarterly report on Form 10-Q, which is on file with the SEC and is incorporated herein by reference, and which may be amended, supplemented or superseded from time to time by other reports we file with the SEC in the future.
 
In addition, any capital raising transaction we are able to complete may substantially dilute the ownership of existing equity holders or may provide rights to our intellectual property or contemplate rights in liquidation that are superior to those of existing investors. Any such financing, and any sale of assets or business combination transaction, may imply a company valuation below the then-current market price of our common stock and may result in minimal proceeds to stockholders or creditors. We have ongoing discussions regarding transactions that imply low valuations for the company’s assets. Depending on our financial position, we may pursue such a transaction. If we are unable to raise capital or execute a sale or business combination transaction, we may need to cease operations or liquidate. In such a scenario, our creditors would be entitled to payment ahead of our equity holders, and there may not be sufficient assets to pay our creditors in full.
 
The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations.
 
FORWARD-LOOKING STATEMENTS
 
This prospectus, any prospectus supplement and the documents we have filed with the SEC that are incorporated herein by reference contain forward-looking statements. The forward-looking statements include statements about the time period during which existing cash resources can support our operations, our efforts to explore strategic alternatives, the financial impact of changes in interest rates, and other statements regarding our plans, estimates and beliefs. In some cases, you can identify forward-looking statements by terms such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “would” and similar expressions intended to identify forward-looking statements.
 
Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements to be materially different from any future results, performances or achievements expressed or implied by the forward-looking statements. Factors that will impact our future results include, but are not limited to:
 
  •  our ability to raise sufficient capital resources to fund operating, development and other business activities;
 
  •  the scope, rate of progress and expense of our clinical trials and other research and development activities;
 
  •  the potential benefits of our product candidates over other therapies;
 
  •  our ability to manufacture, market, commercialize and achieve market acceptance for any of our product candidates that we are developing or may develop in the future;
 
  •  the availability of the raw materials and active pharmaceutical ingredients necessary to manufacture drug product for clinical and commercialization purposes;
 
  •  our reliance on third-parties for the manufacturing, packaging and distribution of drug product;
 
  •  future clinical trial results;


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  •  the terms and time associated with seeking any collaborative, licensing and other arrangements that we may establish;
 
  •  the expense and timing of regulatory approvals;
 
  •  the outcome of our disputes with Lonza Ltd., our efforts to negotiate other potential liabilities, and the impact of such matters on our cash resources and solvency; and
 
  •  the expense of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights.
 
Furthermore, our discussions regarding strategic alternatives may result in no transactions or in transactions which result in modest proceeds to us and our security holders. In light of the Company’s financial position, we may pursue a transaction that results in proceeds to investors in the securities covered by this prospectus substantially below the purchase price for such securities.
 
Given all these uncertainties, you should not place undue reliance on forward-looking statements. You should read this document, any supplements to this document and the documents that we reference in this prospectus with the understanding that our actual future results may be materially different. Except as required by law, we do not undertake any obligation to update or revise any forward-looking statements contained in this prospectus and any supplements to this prospectus, whether as a result of new information, future events or otherwise.
 
RATIO OF EARNINGS TO FIXED CHARGES
 
Our earnings are inadequate to cover fixed charges. The following table sets forth the dollar amount of the coverage.
 
                                                 
                                  Three Months
 
                                  Ended
 
    Year Ended December 31,     March 31,
 
    2004     2005     2006     2007     2008     2009  
                (In thousands)              
 
Ratio of Earnings to Fixed Charges(1)
                                   
Deficiency of Earnings Available to Cover Fixed Charges
  $ (29,545 )   $ (38,032 )   $ (56,966 )   $ (63,457 )   $ (96,847 )   $ (20,647 )
Ratio of Combined Fixed Charges and Preferred Stock Dividends to Earnings(1)
                                   
Deficiency of Earnings available to Cover Combined Fixed Charges and Preferred Stock Dividends
  $ (35,635 )   $ (45,895 )   $ (57,848 )   $ (63,682 )   $ (97,072 )   $ (20,730 )
 
 
(1) In each of the periods presented, our earnings were insufficient to cover fixed charges and accordingly ratios are not presented.
 
USE OF PROCEEDS
 
Except as otherwise provided in the applicable prospectus supplement, we intend to use the net proceeds from the sale of the securities covered by this prospectus for general corporate purposes, which may include working capital, research and development expenditures, clinical trial expenditures, resolving disputes, and satisfying liabilities. Additional information on the use of net proceeds from the sale of securities covered by this prospectus may be set forth in the prospectus supplement relating to the specific offering.


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PLAN OF DISTRIBUTION
 
We may sell securities in any of the ways described below or in any combination:
 
  •  to or through underwriters or dealers;
 
  •  through one or more agents; or
 
  •  directly to purchasers or to a single purchaser.
 
The distribution of the securities may be effected from time to time in one or more transactions:
 
  •  at a fixed price, or prices, which may be changed from time to time;
 
  •  at market prices prevailing at the time of sale;
 
  •  at prices related to such prevailing market prices; or
 
  •  at negotiated prices.
 
Each prospectus supplement will describe the method of distribution of the securities and any applicable restrictions.
 
The prospectus supplement with respect to the securities of a particular series will describe the terms of the offering of the securities, including the following:
 
  •  the name or names of any underwriters, dealers or agents, the amounts of securities underwritten or purchased by each of them, the nature of the obligations of any underwriters and the terms of any agreements with any brokers or dealers;
 
  •  the offering price of the securities and the proceeds to us and any discounts, commissions or concessions allowed or reallowed or paid to underwriters or dealers; and
 
  •  any securities exchanges on which the securities may be listed.
 
Any offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time. Under no circumstances will any fees, discounts, commissions or concessions received by any Financial Industry Regulatory Authority (FINRA) member or independent broker-dealer exceed eight percent of the gross proceeds to us of any offering in the United States covered by this prospectus.
 
Only the agents or underwriters named in each prospectus supplement are agents or underwriters in connection with the securities being offered thereby. We may authorize underwriters, dealers or other persons acting as our agents to solicit offers by certain institutions to purchase securities from us pursuant to delayed delivery contracts providing for payment and delivery on the date stated in each applicable prospectus supplement. Each contract will be for an amount not less than, and the aggregate amount of securities sold pursuant to such contracts shall not be less nor more than, the respective amounts stated in each applicable prospectus supplement. Institutions with whom the contracts, when authorized, may be made include commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions and other institutions, but shall in all cases be subject to our approval. Delayed delivery contracts will be subject only to those conditions set forth in each applicable prospectus supplement, and each prospectus supplement will set forth any commissions we pay for solicitation of these contracts.
 
Agents, underwriters and other third parties described above may be entitled to indemnification by us against certain civil liabilities, including liabilities under the Securities Act of 1933, or to contribution with respect to payments which the agents or underwriters may be required to make in respect thereof. Agents, underwriters and such other third parties may be customers of, engage in transactions with, or perform services for us in the ordinary course of business.
 
One or more firms, referred to as “remarketing firms,” may also offer or sell the securities, if a prospectus supplement so indicates, in connection with a remarketing arrangement upon their purchase. Remarketing firms will act as principals for their own accounts or as our agents. These remarketing firms will offer or sell


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the securities in accordance with the terms of the securities. Each prospectus supplement will identify and describe any remarketing firm and the terms of its agreement, if any, with us and will describe the remarketing firm’s compensation. Remarketing firms may be deemed to be underwriters in connection with the securities they remarket. Remarketing firms may be entitled under agreements that may be entered into with us to indemnification by us against certain civil liabilities, including liabilities under the Securities Act of 1933, and may be customers of, engage in transactions with or perform services for us in the ordinary course of business.
 
Certain underwriters may use this prospectus and any accompanying prospectus supplement for offers and sales related to market-making transactions in the securities. These underwriters may act as principal or agent in these transactions, and the sales will be made at prices related to prevailing market prices at the time of sale.
 
The securities may be new issues of securities and may have no established trading market. The securities may or may not be listed on a national securities exchange. Underwriters may make a market in these securities, but will not be obligated to do so and may discontinue any market making at any time without notice. We can make no assurance as to the liquidity of, or the existence of trading markets for, any of the securities.
 
Certain persons participating in an offering may engage in overallotment, stabilizing transactions, short covering transactions and penalty bids in accordance with rules and regulations under the Exchange Act. Overallotment involves sales in excess of the offering size, which create a short position. Stabilizing transactions permit bids to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum. Short covering transactions involve purchases of the securities in the open market after the distribution is completed to cover short positions. Penalty bids permit the underwriters to reclaim a selling concession from a dealer when the securities originally sold by the dealer are purchased in a covering transaction to cover short positions. Those activities may cause the price of the securities to be higher than it would otherwise be. If commenced, the underwriters may discontinue any of the activities at any time.
 
DESCRIPTION OF COMMON STOCK
 
As of June 22, 2009, we are authorized to issue 100,000,000 shares of common stock. As of June 15, 2009, we had 31,131,056 shares of common stock outstanding.
 
The following summary of certain provisions of our common stock does not purport to be complete. You should refer to our restated certificate of incorporation and our amended and restated by-laws, both of which are included as exhibits to our most recent annual report on form 10-K incorporated by reference into this prospectus. The summary below is also qualified by provisions of applicable law.
 
General
 
Holders of common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders, and do not have cumulative voting rights. Subject to preferences that may be applicable to any outstanding shares of preferred stock, holders of common stock are entitled to receive ratably such dividends, if any, as may be declared from time to time by our board of directors out of funds legally available for dividend payments. All outstanding shares of common stock are fully paid and nonassessable, and the shares of common stock to be issued upon completion of an offering will be fully paid and nonassessable. The holders of common stock have no preferences or rights of conversion, exchange, pre-emption or other subscription rights. There are no redemption or sinking fund provisions applicable to the common stock. In the event of any liquidation, dissolution or winding-up of our affairs, holders of common stock will be entitled to share ratably in our assets that are remaining after payment or provision for payment of all of our debts and obligations and after liquidation payments to holders of outstanding shares of preferred stock, if any.


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Transfer Agent and Registrar
 
The transfer agent and registrar for our common stock is Computershare Shareholder Services, Inc.
 
Nasdaq Global Market
 
Our common stock is listed for quotation on the Nasdaq Global Market under the symbol “ALTU.”
 
DESCRIPTION OF PREFERRED STOCK
 
Our authorized preferred stock has priority over our common stock with respect to dividends and other distributions, including the distribution of assets upon liquidation.
 
We have 450,000 shares of our redeemable preferred stock authorized, issued and outstanding, which provide Vertex Pharmaceuticals Incorporated (“Vertex”), the sole holder of such shares, the option to seek redemption on or after December 31, 2010 at a price of $10.00 per share plus accrued but unpaid dividends, prior to payment of any amounts on common stock. All of the shares of redeemable preferred stock were issued on February 1, 1999 with an allocated value of $3,100,000. The redeemable preferred stock accrues dividends at an annual rate of 5% of the purchase price per year and has no voting rights other than with respect to specified changes to our certificate of incorporation. As of May 31, 2009, dividends in the amount of $2,325,000 were accrued and unpaid on our redeemable preferred stock. Upon liquidation, including deemed liquidations pursuant to a merger, consolidation or a sale of all or substantially all of our assets, the terms of the redeemable preferred stock contemplate payment of $10.00 per share plus accrued but unpaid dividends prior to payment of any amounts on the common stock. We have agreed not to declare any dividends on our common stock or to purchase, acquire, repurchase or redeem any shares of our own capital stock until after we have paid all accrued but unpaid dividends on our redeemable preferred stock.
 
In addition, our board of directors has the authority, without further stockholder authorization, to issue from time to time shares of preferred stock in one or more series and to fix the terms, limitations, relative rights and preferences and variations of each series. The issuance of shares of preferred stock, or the issuance of rights to purchase such shares, could decrease the amount of earnings and assets available for distribution to the holders of common stock, could adversely affect the rights and powers, including voting rights, of the common stock, and could have the effect of delaying, deterring or preventing a change in control of us or an unsolicited acquisition proposal.
 
If we offer a specific series of preferred stock under this prospectus, we will describe the terms of the preferred stock in the prospectus supplement for such offering and will file a copy of the certificate establishing the terms of the preferred stock with the SEC. To the extent required, this description will include:
 
  •  the title and stated value;
 
  •  the number of shares offered, the liquidation preference per share and the purchase price;
 
  •  the dividend rate(s), period(s) and/or payment date(s), or method(s) of calculation for such dividends;
 
  •  whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate;
 
  •  the procedures for any auction and remarketing, if any;
 
  •  the provisions for a sinking fund, if any;
 
  •  the provisions for redemption, if applicable;
 
  •  any listing of the preferred stock on any securities exchange or market;
 
  •  whether the preferred stock will be convertible into our common stock, and, if applicable, the conversion price (or how it will be calculated) and conversion period;


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  •  whether the preferred stock will be exchangeable into debt securities, and, if applicable, the exchange price (or how it will be calculated) and exchange period;
 
  •  voting rights, if any, of the preferred stock;
 
  •  a discussion of any material and/or special U.S. federal income tax considerations applicable to the preferred stock;
 
  •  the relative ranking and preferences of the preferred stock as to dividend rights and rights upon liquidation, dissolution or winding up of the affairs of Altus Pharmaceuticals Inc.; and
 
  •  any material limitations on issuance of any class or series of preferred stock ranking senior to or on a parity with the series of preferred stock as to dividend rights and rights upon liquidation, dissolution or winding up of Altus Pharmaceuticals Inc.
 
The preferred stock offered by this prospectus, when issued, will not have, or be subject to, any preemptive or similar rights.
 
Transfer Agent and Registrar
 
The transfer agent and registrar for any series or class of preferred stock will be set forth in each applicable prospectus supplement.
 
DESCRIPTION OF WARRANTS
 
We may issue warrants to purchase shares of our common stock, preferred stock and/or debt securities in one or more series together with other securities or separately, as described in each applicable prospectus supplement. Below is a description of certain general terms and provisions of the warrants that we may offer. Particular terms of the warrants will be described in the applicable warrant agreements and the applicable prospectus supplement to the warrants.
 
The applicable prospectus supplement will contain, where applicable, the following terms of and other information relating to the warrants:
 
  •  the specific designation and aggregate number of, and the price at which we will issue, the warrants;
 
  •  the currency or currency units in which the offering price, if any, and the exercise price are payable;
 
  •  the designation, amount and terms of the securities purchasable upon exercise of the warrants;
 
  •  if applicable, the exercise price for shares of our common stock and the number of shares of common stock to be received upon exercise of the warrants;
 
  •  if applicable, the exercise price for shares of our preferred stock, the number of shares of preferred stock to be received upon exercise of the warrants, and a description of that series of our preferred stock;
 
  •  if applicable, the exercise price for our debt securities, the amount of debt securities to be received upon exercise of the warrants, and a description of that series of debt securities;
 
  •  the date on which the right to exercise the warrants will begin and the date on which that right will expire or, if you may not continuously exercise the warrants throughout that period, the specific date or dates on which you may exercise the warrants;
 
  •  any provisions for changes to or adjustments in the exercise price of the warrants;
 
  •  whether the warrants will be issued in fully registered form or bearer form, in definitive or global form or in any combination of these forms, although, in any case, the form of a warrant included in a unit will correspond to the form of the unit and of any security included in that unit;
 
  •  any applicable material U.S. federal income tax consequences;


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  •  the identity of the warrant agent for the warrants and of any other depositaries, execution or paying agents, transfer agents, registrars or other agents;
 
  •  the proposed listing, if any, of the warrants or any securities purchasable upon exercise of the warrants on any securities exchange;
 
  •  if applicable, the date from and after which the warrants and the common stock, preferred stock and/or debt securities will be separately transferable;
 
  •  if applicable, the minimum or maximum amount of the warrants that may be exercised at any one time;
 
  •  information with respect to book-entry procedures, if any;
 
  •  the anti-dilution provisions of the warrants, if any;
 
  •  any redemption or call provisions;
 
  •  whether the warrants are to be sold separately or with other securities as parts of units; and
 
  •  any additional terms of the warrants, including terms, procedures and limitations relating to the exchange and exercise of the warrants.
 
Transfer Agent and Registrar
 
The transfer agent and registrar for any warrants will be set forth in the applicable prospectus supplement.
 
DESCRIPTION OF DEBT SECURITIES
 
We will issue the debt securities offered by this prospectus and any accompanying prospectus supplement under an indenture to be entered into between us and the trustee identified in the applicable prospectus supplement. The terms of the debt securities will include those stated in the indenture and those made part of the indenture by reference to the Trust Indenture Act of 1939, as in effect on the date of the indenture. We have filed a copy of the form of indenture as an exhibit to the registration statement in which this prospectus is included. The indenture will be subject to and governed by the terms of the Trust Indenture Act of 1939.
 
We may offer under this prospectus up to an aggregate principal amount of $20,000,000 in debt securities; or if debt securities are issued at a discount, or in a foreign currency, foreign currency units or composite currency, the principal amount as may be sold for an initial public offering price of up to $20,000,000. Unless otherwise specified in the applicable prospectus supplement, the debt securities will represent direct, unsecured obligations of Altus Pharmaceuticals Inc. and will rank equally with all of our other unsecured indebtedness.
 
The following statements relating to the debt securities and the indenture are summaries, qualified in their entirety to the detailed provisions of the indenture.
 
General
 
We may issue the debt securities in one or more series with the same or various maturities, at par, at a premium, or at a discount. We will describe the particular terms of each series of debt securities in a prospectus supplement relating to that series, which we will file with the SEC.
 
The prospectus supplement will set forth, to the extent required, the following terms of the debt securities in respect of which the prospectus supplement is delivered:
 
  •  the title of the series;
 
  •  the aggregate principal amount;
 
  •  the issue price or prices, expressed as a percentage of the aggregate principal amount of the debt securities;


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  •  any limit on the aggregate principal amount;
 
  •  the date or dates on which principal is payable;
 
  •  the interest rate or rates (which may be fixed or variable) or, if applicable, the method used to determine such rate or rates;
 
  •  the date or dates from which interest, if any, will be payable and any regular record date for the interest payable;
 
  •  the place or places where principal and, if applicable, premium and interest, is payable;
 
  •  the terms and conditions upon which we may, or the holders may require us to, redeem or repurchase the debt securities;
 
  •  the denominations in which such debt securities may be issuable, if other than denominations of $1,000 or any integral multiple of that number;
 
  •  whether the debt securities are to be issuable in the form of certificated debt securities (as described below) or global debt securities (as described below);
 
  •  the portion of principal amount that will be payable upon declaration of acceleration of the maturity date if other than the principal amount of the debt securities;
 
  •  the currency of denomination;
 
  •  the designation of the currency, currencies or currency units in which payment of principal and, if applicable, premium and interest, will be made;
 
  •  if payments of principal and, if applicable, premium or interest, on the debt securities are to be made in one or more currencies or currency units other than the currency of denomination, the manner in which the exchange rate with respect to such payments will be determined;
 
  •  if amounts of principal and, if applicable, premium and interest may be determined by reference to an index based on a currency or currencies or by reference to a commodity, commodity index, stock exchange index or financial index, then the manner in which such amounts will be determined;
 
  •  the provisions, if any, relating to any collateral provided for such debt securities;
 
  •  the provisions, if any, with respect to amortization;
 
  •  any addition to or change in the covenants and/or the acceleration provisions described in this prospectus or in the indenture;
 
  •  any events of default, if not otherwise described below under “Events of Default”;
 
  •  the terms and conditions, if any, for conversion into or exchange for shares of common stock or preferred stock;
 
  •  any terms and conditions restricting the declaration of dividends or requiring the maintenance of any asset ratio or the creation or maintenance of reserves;
 
  •  any provisions restricting the incurrence of additional debt or the issuance of additional securities;
 
  •  any depositaries, interest rate calculation agents, exchange rate calculation agents or other agents;
 
  •  the terms and conditions, if any, upon which the debt securities shall be subordinated in right of payment to our other indebtedness; and
 
  •  the priority and kind of any lien securing the securities and a brief identification of the principal properties subject to such lien.
 
We may issue discount debt securities that provide for an amount less than the stated principal amount to be due and payable upon acceleration of the maturity of such debt securities in accordance with the terms of


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the indenture. We may also issue debt securities in bearer form, with or without coupons. If we issue discount debt securities or debt securities in bearer form, we will describe material U.S. federal income tax considerations and other material special considerations which apply to these debt securities in the applicable prospectus supplement.
 
We may issue debt securities denominated in or payable in a foreign currency or currencies or a foreign currency unit or units. If we do, we will describe the restrictions, elections, and general tax considerations relating to the debt securities and the foreign currency or currencies or foreign currency unit or units in the applicable prospectus supplement.
 
Exchange and/or Conversion Rights
 
We may issue debt securities which can be exchanged for or converted into shares of common stock or preferred stock. If we do, we will describe the terms of exchange or conversion in the prospectus supplement relating to these debt securities.
 
Transfer and Exchange
 
We may issue debt securities that will be represented by either:
 
  •  “book-entry securities,” which means that there will be one or more global securities registered in the name of a depositary or a nominee of a depositary; or
 
  •  “certificated securities,” which means that they will be represented by a certificate issued in definitive registered form.
 
We will specify in the prospectus supplement applicable to a particular offering whether the debt securities offered will be book-entry or certificated securities.
 
Certificated Debt Securities
 
If you hold certificated debt securities, you may transfer or exchange such debt securities at the trustee’s office or at the paying agent’s office or agency in accordance with the terms of the indenture. You will not be charged a service charge for any transfer or exchange of certificated debt securities but may be required to pay an amount sufficient to cover any tax or other governmental charge payable in connection with such transfer or exchange.
 
You may effect the transfer of certificated debt securities and of the right to receive the principal of, premium, and/or interest, if any, on the certificated debt securities only by surrendering the certificate representing the certificated debt securities and having us or the trustee issue a new certificate to the new holder.
 
Global Securities
 
If we decide to issue debt securities in the form of one or more global securities, then we will register the global securities in the name of the depositary for the global securities or the nominee of the depositary, and the global securities will be delivered by the trustee to the depositary for credit to the accounts of the holders of beneficial interests in the debt securities.
 
The prospectus supplement will describe the specific terms of the depositary arrangement for debt securities of a series that are issued in global form. None of our company, the trustee, any payment agent or the security registrar will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in a global debt security or for maintaining, supervising or reviewing any records relating to these beneficial ownership interests.
 
No Protection in the Event of Change of Control
 
The indenture does not have any covenants or other provisions providing for a put or increased interest or otherwise that would afford holders of debt securities additional protection in the event of a recapitalization transaction, a change of control of Altus Pharmaceuticals Inc., or a highly leveraged transaction. If we offer


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any covenants or provisions of this type with respect to any debt securities covered by this prospectus, we will describe them in the applicable prospectus supplement.
 
Covenants
 
Unless otherwise indicated in this prospectus or a prospectus supplement, the debt securities will not have the benefit of any covenants that limit or restrict our business or operations, the pledging of our assets or the incurrence by us of indebtedness. We will describe in the applicable prospectus supplement any material covenants in respect of a series of debt securities.
 
Consolidation, Merger and Sale of Assets
 
The form of indenture contemplates that, if we were to issue debt securities pursuant to the indenture, we would agree that we would not consolidate with or merge into any other person or convey, transfer, sell or lease our properties and assets substantially as an entirety to any person, unless:
 
  •  the person formed by the consolidation or into or with which we are merged or the person to which our properties and assets are conveyed, transferred, sold or leased, is a corporation organized and existing under the laws of the U.S., any state or the District of Columbia or a corporation or comparable legal entity organized under the laws of a foreign jurisdiction and, if we are not the surviving person, the surviving person has expressly assumed all of our obligations, including the payment of the principal of and, premium, if any, and interest on the debt securities and the performance of the other covenants under the indenture; and
 
  •  immediately before and immediately after giving effect to the transaction, no event of default, and no event which, after notice or lapse of time or both, would become an event of default, has occurred and is continuing under the indenture.
 
Events of Default
 
Unless otherwise specified in the applicable prospectus supplement, the following events will be events of default under the indenture with respect to debt securities of any series:
 
  •  we fail to pay any principal or premium, if any, when it becomes due;
 
  •  we fail to pay any interest within 30 days after it becomes due;
 
  •  we fail to observe or perform any other covenant in the debt securities or the indenture for 60 days after written notice specifying the failure from the trustee or the holders of not less than 25% in aggregate principal amount of the outstanding debt securities of that series; and
 
  •  certain events involving bankruptcy, insolvency or reorganization of Altus Pharmaceuticals Inc. or any of our significant subsidiaries.
 
The trustee may withhold notice to the holders of the debt securities of any series of any default, except in payment of principal of or premium, if any, or interest on the debt securities of a series, if the trustee considers it to be in the best interest of the holders of the debt securities of that series to do so.
 
If an event of default (other than an event of default resulting from certain events of bankruptcy, insolvency or reorganization) occurs, and is continuing, then the trustee or the holders of not less than 25% in aggregate principal amount of the outstanding debt securities of any series may accelerate the maturity of the debt securities. If this happens, the entire principal amount, plus the premium, if any, of all the outstanding debt securities of the affected series plus accrued interest to the date of acceleration will be immediately due and payable. At any time after the acceleration, but before a judgment or decree based on such acceleration is obtained by the trustee, the holders of a majority in aggregate principal amount of outstanding debt securities of such series may rescind and annul such acceleration if:
 
  •  all events of default (other than nonpayment of accelerated principal, premium or interest) have been cured or waived;


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  •  all lawful interest on overdue interest and overdue principal has been paid; and
 
  •  the rescission would not conflict with any judgment or decree.
 
In addition, if the acceleration occurs at any time when we have outstanding indebtedness which is senior to the debt securities, the payment of the principal amount of outstanding debt securities may be subordinated in right of payment to the prior payment of any amounts due under the senior indebtedness, in which case the holders of debt securities will be entitled to payment under the terms prescribed in the instruments evidencing the senior indebtedness and the indenture.
 
If an event of default resulting from certain events of bankruptcy, insolvency or reorganization occurs, the principal, premium and interest amount with respect to all of the debt securities of any series will be due and payable immediately without any declaration or other act on the part of the trustee or the holders of the debt securities of that series.
 
The holders of a majority in principal amount of the outstanding debt securities of a series will have the right to waive any existing default or compliance with any provision of the indenture or the debt securities of that series and to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, subject to certain limitations specified in the indenture.
 
No holder of any debt security of a series will have any right to institute any proceeding with respect to the indenture or for any remedy under the indenture, unless:
 
  •  the holder gives to the trustee written notice of a continuing event of default;
 
  •  the holders of at least 25% in aggregate principal amount of the outstanding debt securities of the affected series make a written request and offer reasonable indemnity to the trustee to institute a proceeding as trustee;
 
  •  the trustee fails to institute a proceeding within 60 days after such request; and
 
  •  the holders of a majority in aggregate principal amount of the outstanding debt securities of the affected series do not give the trustee a direction inconsistent with such request during such 60-day period.
 
These limitations do not, however, apply to a suit instituted for payment on debt securities of any series on or after the due dates expressed in the debt securities.
 
We will periodically deliver certificates to the trustee regarding our compliance with our obligations under the indenture.
 
Modification and Waiver
 
From time to time, we and the trustee may, without the consent of holders of the debt securities of one or more series, amend the indenture or the debt securities of one or more series, or supplement the indenture, for certain specified purposes, including:
 
  •  to provide that the surviving entity following a change of control of Altus Pharmaceuticals Inc. permitted under the indenture will assume all of our obligations under the indenture and debt securities;
 
  •  to provide for certificated debt securities in addition to uncertificated debt securities;
 
  •  to comply with any requirements of the SEC under the Trust Indenture Act of 1939;
 
  •  to provide for the issuance of and establish the form and terms and conditions of debt securities of any series as permitted by the indenture;
 
  •  to cure any ambiguity, defect or inconsistency, or make any other change that does not materially and adversely affect the rights of any holder; and
 
  •  to appoint a successor trustee under the indenture with respect to one or more series.


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From time to time we and the trustee may, with the consent of holders of at least a majority in principal amount of an outstanding series of debt securities, amend or supplement the indenture or the debt securities series, or waive compliance in a particular instance by us with any provision of the indenture or the debt securities. We may not, however, without the consent of each holder affected by such action, modify or supplement the indenture or the debt securities or waive compliance with any provision of the indenture or the debt securities in order to:
 
  •  reduce the amount of debt securities whose holders must consent to an amendment, supplement, or waiver to the indenture or such debt security;
 
  •  reduce the rate of or change the time for payment of interest or reduce amount of or postpone the date for payment of sinking fund or analogous obligations;
 
  •  reduce the principal of or change the stated maturity of the debt securities;
 
  •  make any debt security payable in money other than that stated in the debt security;
 
  •  change the amount or time of any payment required or reduce the premium payable upon any redemption, or change the time before which no such redemption may be made;
 
  •  waive a default in the payment of the principal of, premium, if any, or interest on the debt securities or a redemption payment;
 
  •  waive a redemption payment with respect to any debt securities or change any provision with respect to redemption of debt securities; or
 
  •  take any other action otherwise prohibited by the indenture to be taken without the consent of each holder affected by the action.
 
Defeasance of Debt Securities and Certain Covenants in Certain Circumstances
 
The indenture permits us, at any time, to elect to discharge our obligations with respect to one or more series of debt securities by following certain procedures described in the indenture. These procedures will allow us either:
 
  •  to defease and be discharged from any and all of our obligations with respect to any debt securities except for the following obligations (which discharge is referred to as “legal defeasance”):
 
(1) to register the transfer or exchange of such debt securities;
 
(2) to replace temporary or mutilated, destroyed, lost or stolen debt securities;
 
(3) to compensate and indemnify the trustee; or
 
(4) to maintain an office or agency in respect of the debt securities and to hold monies for payment in trust; or
 
  •  to be released from our obligations with respect to the debt securities under certain covenants contained in the indenture, as well as any additional covenants which may be contained in the applicable supplemental indenture (which release is referred to as “covenant defeasance”).
 
In order to exercise either defeasance option, we must deposit with the trustee or other qualifying trustee, in trust for that purpose:
 
  •  money;
 
  •  U.S. Government Obligations (as described below) or Foreign Government Obligations (as described below) which through the scheduled payment of principal and interest in accordance with their terms will provide money; or


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  •  a combination of money and/or U.S. Government Obligations and/or Foreign Government Obligations sufficient in the written opinion of a nationally-recognized firm of independent accountants to provide money;
 
which in each case specified above, provides a sufficient amount to pay the principal of, premium, if any, and interest, if any, on the debt securities of the series, on the scheduled due dates or on a selected date of redemption in accordance with the terms of the indenture.
 
In addition, defeasance may be effected only if, among other things:
 
  •  in the case of either legal or covenant defeasance, we deliver to the trustee an opinion of counsel, as specified in the indenture, stating that as a result of the defeasance neither the trust nor the trustee will be required to register as an investment company under the Investment Company Act of 1940;
 
  •  in the case of legal defeasance, we deliver to the trustee an opinion of counsel stating that we have received from, or there has been published by, the Internal Revenue Service a ruling to the effect that, or there has been a change in any applicable federal income tax law with the effect that (and the opinion shall confirm that), the holders of outstanding debt securities will not recognize income, gain or loss for U.S. federal income tax purposes solely as a result of such legal defeasance and will be subject to U.S. federal income tax on the same amounts, in the same manner, including as a result of prepayment, and at the same times as would have been the case if legal defeasance had not occurred;
 
  •  in the case of covenant defeasance, we deliver to the trustee an opinion of counsel to the effect that the holders of the outstanding debt securities will not recognize income, gain or loss for U.S. federal income tax purposes as a result of covenant defeasance and will be subject to U.S. federal income tax on the same amounts, in the same manner and at the same times as would have been the case if covenant defeasance had not occurred; and
 
  •  certain other conditions described in the indenture are satisfied.
 
If we fail to comply with our remaining obligations under the indenture and applicable supplemental indenture after a covenant defeasance of the indenture and applicable supplemental indenture, and the debt securities are declared due and payable because of the occurrence of any undefeased event of default, the amount of money and/or U.S. Government Obligations and/or Foreign Government Obligations on deposit with the trustee could be insufficient to pay amounts due under the debt securities of the affected series at the time of acceleration. We will, however, remain liable in respect of these payments.
 
The term “U.S. Government Obligations” as used in the above discussion means securities which are direct obligations of or non-callable obligations guaranteed by the United States of America for the payment of which obligation or guarantee the full faith and credit of the United States of America is pledged.
 
The term “Foreign Government Obligations” as used in the above discussion means, with respect to debt securities of any series that are denominated in a currency other than U.S. dollars (1) direct obligations of the government that issued or caused to be issued such currency for the payment of which obligations its full faith and credit is pledged or (2) obligations of a person controlled or supervised by or acting as an agent or instrumentality of such government the timely payment of which is unconditionally guaranteed as a full faith and credit obligation by that government, which in either case under clauses (1) or (2), are not callable or redeemable at the option of the issuer.
 
Regarding the Trustee
 
We will identify the trustee with respect to any series of debt securities in the prospectus supplement relating to the applicable debt securities. You should note that if the trustee becomes a creditor of Altus Pharmaceuticals Inc., the indenture and the Trust Indenture Act of 1939 limit the rights of the trustee to obtain payment of claims in certain cases, or to realize on certain property received in respect of any such claim, as security or otherwise. The trustee and its affiliates may engage in, and will be permitted to continue to engage in, other transactions with us and our affiliates. If, however, the trustee acquires any “conflicting interest” within the meaning of the Trust Indenture Act of 1939, it must eliminate such conflict or resign.


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The holders of a majority in principal amount of the then outstanding debt securities of any series may direct the time, method and place of conducting any proceeding for exercising any remedy available to the trustee. If an event of default occurs and is continuing, the trustee, in the exercise of its rights and powers, must use the degree of care and skill of a prudent person in the conduct of his or her own affairs. Subject to that provision, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request of any of the holders of the debt securities, unless they have offered to the trustee reasonable indemnity or security.
 
DESCRIPTION OF UNITS
 
General
 
We may issue units comprised of any combination of our debt securities, common stock, preferred stock and warrants, as described in each applicable prospectus supplement. Below is a description of certain general terms and provisions of units that we may offer. We will issue each unit so that the holder of the unit is also the holder of each security included in the unit. As a result, the holder of a unit will have the rights and obligations of a holder of each included security. The unit agreement under which a unit is issued, if any, may provide that the securities included in the unit may not be held or transferred separately, at any time or at any time before a specified date.
 
Applicable prospectus supplements will contain, where applicable, the following terms of and other information relating to units:
 
  •  the terms of the units and of the securities comprising the units, including whether and under what circumstances those securities may be held or transferred separately;
 
  •  whether the units will be issued in fully registered or global form; and
 
  •  other material terms of the units.
 
The applicable provisions described in this section, as well as those described under “Description of Debt Securities,” “Description of Capital Stock” and “Description of Warrants,” will apply to each unit and to each security included in each unit as applicable.
 
WHERE YOU CAN FIND MORE INFORMATION
 
We have filed a registration statement on Form S-3 with the SEC for the stock we are offering by this prospectus. This prospectus does not include all of the information contained in the registration statement. You should refer to the registration statement and its exhibits for additional information.
 
We are required to file annual and quarterly reports, special reports, proxy statements, and other information with the SEC. We make these documents publicly available, free of charge, on our website at www.altus.com as soon as reasonably practicable after filing such documents with the SEC. You can read our SEC filings, including the registration statement, on the SEC’s website at http://www.sec.gov. You also may read and copy any document we file with the SEC at its public reference facility at:
 
Public Reference Room
100 F Street N.E.
Washington, DC 20549.
 
Please call the SEC at 1-800-732-0330 for further information on the operation of the public reference facilities.


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INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
The SEC allows us to “incorporate by reference” into this prospectus the information we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus, and information in documents that we file later with the SEC will automatically update and supersede information in this prospectus. We incorporate by reference the documents listed below into this prospectus, and any future filings made by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act until we close this offering, including all filings made after the date of the initial registration statement and prior to the effectiveness of the registration statement. We hereby incorporate by reference the following documents:
 
  •  Our Annual Report on Form 10-K, as amended on April 28, 2009 for the year ended December 31, 2008 (File No. 000-51711);
 
  •  Our Quarterly Report on Form 10-Q for the quarter ended March 31, 2009 (File No. 000-51711);
 
  •  Our Current Reports on Form 8-K filed on January 6, 2009, January 26, 2009, as amended April 2, 2009, February 2, 2009 , March 12, 2009, April 2, 2009, April 6, 2009, May 5, 2009, and May 21, 2009 (excluding any information furnished in such reports under Item 2.02, Item 7.01 or Item 9.01) (File No. 000-51711);
 
  •  The description of our common stock contained in our registration statements on Form 8-A (File No. 000-51711) filed January 11, 2006, under the Exchange Act, including any amendment or report filed for the purpose of updating such description; and
 
You may request a copy of these filings, at no cost, by writing or telephoning us at the following address:
 
610 Lincoln Street
Waltham, MA 02451
Attention: Investor Relations
Phone: (781) 373-6432
email: ir@altus.com
 
Copies of these filings are also available, without charge, on our Internet website at www.altus.com as soon as reasonably practicable after they are filed electronically with the SEC. The information contained on our website is not a part of this prospectus.
 
LEGAL MATTERS
 
The validity of the issuance of the securities offered hereby will be passed upon for us by Ropes & Gray LLP, Boston, Massachusetts. The validity of any securities will be passed upon for any underwriters or agents by counsel that we will name in the applicable prospectus supplement.
 
EXPERTS
 
The consolidated financial statements of Altus Pharmaceuticals Inc. incorporated by reference from Altus Pharmaceuticals Inc.’s Annual Report (Form 10-K) for the year ended December 31, 2008 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.
 
The financial statements as of December 31, 2007, and for each of the two years in the period ended December 31, 2007, incorporated in this Prospectus by reference from the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report, which is incorporated herein by reference. Such financial statements have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.


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$20,000,000
 
Altus Pharmaceuticals Inc.
 
Common Stock
Preferred Stock
Warrants
Debt Securities
Units
 
 
PROSPECTUS
 
 
 
          , 2009
 
We have not authorized any dealer, salesperson or other person to give any information or represent anything not contained in this prospectus. You must not rely on any unauthorized information. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus does not offer to sell any shares in any jurisdiction where it is unlawful. Neither the delivery of this prospectus, nor any sale made hereunder, shall create any implication that the information in this prospectus is correct after the date hereof.
 


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PART II
 
INFORMATION NOT REQUIRED IN PROSPECTUS
 
Item 14.   Other expenses of Issuance and Distribution.
 
The following table sets forth the various expenses in connection with the sale and distribution of the securities being registered. All amounts shown are estimates, except the SEC registration fee. We have agreed to pay these costs and expenses.
 
         
Securities and Exchange Commission registration fee
  $ 1,116  
Printing and engraving expenses
  $ 15,000 *
Legal fees and expenses
  $ 150,000 *
Accounting fees and expenses
  $ 100,000 *
Trustee, Transfer Agent and Registrar fees
  $ 10,000 *
Trust fees and expenses
  $ 15,000 *
Miscellaneous
  $ 33,884 *
Total
  $ 325,000 *
 
 
* Estimated
 
Item 15.   Indemnification of Directors and Officers.
 
Section 145 of the Delaware General Corporation Law (“DGCL”) provides that a corporation may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal or investigative (other than an action by or in the right of the corporation) by reason of the fact that he is or was a director, officer, employee or agent of the corporation, or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorney’s fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him in connection with such action, suit or proceeding if he acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful. Section 145 further provides that a corporation similarly may indemnify any such person serving in any such capacity who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the corporation to procure a judgment in its favor, against expenses actually and reasonably incurred in connection with the defense or settlement of such action or suit if he acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the corporation and except that no indemnification shall be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to the corporation unless and only to the extent that the Delaware Court of Chancery or such other court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Court of Chancery or such other court shall deem proper.
 
Section 102(b)(7) of the DGCL permits a corporation to include in its certificate of incorporation a provision eliminating or limiting the personal liability of a director to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, provided that such provision shall not eliminate or limit the liability of a director (i) for any breach of the director’s duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL (relating to unlawful payment of dividends and unlawful stock purchase and redemption) or (iv) for any transaction from which the director derived an improper personal benefit.
 
Our restated certificate of incorporation and restated bylaws provide that each person who was or is made a party or is threatened to be made a party to any action, suit or proceeding, whether civil, criminal,


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administrative or investigative, by reason of the fact that he or she is or was one of our directors or officers or is or was serving at our request as a director, officer, employee or agent of another corporation, or of a partnership, joint venture, trust or other enterprise, shall be indemnified by us to the fullest extent authorized by the DGCL against all expense, liability and loss (including attorneys’ fees, judgments, fines or penalties and amounts paid in settlement) reasonably incurred in connection with legal proceedings. A director or officer will not receive indemnification if he or she is found not to have acted in good faith and in a manner he or she reasonably believed to be in, or not opposed to, our best interest.
 
We carry insurance policies insuring our directors and officers against certain liabilities that they may incur in their capacity as directors and officers. In addition, we have entered into indemnification agreements with our directors and executive officers. These agreements contain presumptions and procedures designed to ensure that the indemnification and advancement rights granted to each indemnitee in these agreements will be provided on a timely basis. Each agreement provides that our obligations under the agreement will continue during the time the indemnitee serves Altus and continues thereafter so long as the indemnitee is subject to any possible proceeding by reason of the indemnitee’s service to Altus.
 
Any underwriting agreements that we may enter into will likely provide for the indemnification of us, our controlling persons, our directors and certain of our officers by the underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended.
 
Item 16.   Exhibits.
 
         
Exhibit
 
Description
 
  1 .1*   Form of underwriting agreement
  4 .1*   Form of Common Stock Warrant Agreement and Warrant Certificate
  4 .2*   Form of Preferred Stock Warrant Agreement and Warrant Certificate
  4 .3*   Form of Debt Securities Warrant Agreement and Warrant Certificate
  4 .4*   Form of Unit Warrant Agreement and Warrant Certificate
  4 .5**   Form of Indenture
  5 .1**   Opinion of Ropes & Gray, LLP
  12 .1**   Statement re: Computation of Ratios
  23 .1   Consent of Ropes & Gray LLP (included in Exhibit 5.1)
  23 .2**   Consent of Ernst & Young, LLP
  23 .3**   Consent of Deloitte & Touche LLP
  24 .1**   Power of attorney
  25 .1***   Statement of Eligibility of Trustee Under Debt Indenture
 
 
* To be filed, if necessary, subsequent to the effectiveness of this registration statement by an amendment to this registration statement or incorporated by reference pursuant to a Current Report on Form 8-K in connection with an offering of securities.
 
** Filed herewith.
 
*** To be filed separately pursuant to Section 305(b)(2) of the Trust Indenture Act of 1939.
 
Item 17.   Undertakings.
 
(a) The undersigned registrant hereby undertakes:
 
(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
 
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;
 
(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in


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the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement;
 
(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement.
 
Provided, however, that the undertakings set forth in paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) above do not apply if the registration statement is on Form S-3 or Form F-3 and the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.
 
(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
 
(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.
 
(4) That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:
 
(i) If the registrant is relying on Rule 430B:
 
(A) Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and
 
(B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.
 
(5) That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement,


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regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser: (i) Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424; (ii) any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant; (iii) the portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and (iv) any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.
 
(b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
 
(c) If and when applicable, the undersigned registrant, hereby undertakes to file an application for the purpose of determining the eligibility of the Trustee to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the Commission under Section 305(b)(2) of the Act.
 
(d) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933, and will be governed by the final adjudication of such issue.


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SIGNATURES
 
Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Waltham, Commonwealth of Massachusetts, on the 23rd day of June, 2009.
 
Altus Pharmaceuticals Inc.
 
  By: 
/s/  Georges Gemayel
Name:     Georges Gemayel, Ph.D.
  Title:  President and Chief Executive Officer
 
* * * *
 
Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated:
 
             
         
/s/  Georges Gemayel

Georges Gemayel, Ph.D
  President, Chief Executive Officer and Director
(principal executive officer)
  June 23, 2009
         
/s/  Thomas J. Phair, Jr.

Thomas J. Phair, Jr.
  Vice President, Finance and Treasurer
(principal financial and accounting officer)
  June 23, 2009
         
David D. Pendergast*

David D. Pendergast, Ph.D
  Chairman of the Board   June 23, 2009
         
Manuel A. Navia*

Manuel A. Navia, Ph.D.
  Director   June 23, 2009
         
Harry H. Penner, Jr.*

Harry H. Penner, Jr.
  Director   June 23, 2009


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John P. Richard*

John P. Richard
  Director   June 23, 2009
         
Michael S. Wyzga*

Michael S. Wyzga
  Director   June 23, 2009
             
*By:
 
/s/  Thomas J. Phair, Jr.

Thomas J. Phair, Jr.
Attorney-in-Fact
      June 23, 2009


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EXHIBIT INDEX
 
The following is a list of exhibits filed as part of this registration statement.
 
         
Exhibit
 
Description
 
  1 .1*   Form of underwriting agreement
  4 .1*   Form of Common Stock Warrant Agreement and Warrant Certificate
  4 .2*   Form of Preferred Stock Warrant Agreement and Warrant Certificate
  4 .3*   Form of Debt Securities Warrant Agreement and Warrant Certificate
  4 .4*   Form of Unit Warrant Agreement and Warrant Certificate
  4 .5**   Form of Indenture
  5 .1**   Opinion of Ropes & Gray, LLP
  12 .1**   Statement re: Computation of Ratios
  23 .1   Consent of Ropes & Gray LLP (included in Exhibit 5.1)
  23 .2**   Consent of Ernst & Young, LLP
  23 .3**   Consent of Deloitte & Touche LLP
  24 .1**   Power of attorney
  25 .1***   Statement of Eligibility of Trustee Under Debt Indenture
 
 
* To be filed, if necessary, subsequent to the effectiveness of this registration statement by an amendment to this registration statement or incorporated by reference pursuant to a Current Report on Form 8-K in connection with an offering of securities.
 
** Filed herewith.
 
*** To be filed separately pursuant to Section 305(b)(2) of the Trust Indenture Act of 1939.