Janux Therapeutics Announces Closing of Underwritten Public Offering of Common Stock and Pre-Funded Warrants Including Full Exercise of Underwriters’ Option to Purchase Additional Shares for Total Gross Proceeds of $402.5 Million

Janux Therapeutics, Inc. (Nasdaq: JANX) (Janux), a clinical-stage biopharmaceutical company developing a broad pipeline of novel immunotherapies by applying its proprietary technology to its Tumor Activated T Cell Engager (TRACTr) and Tumor Activated Immunomodulator (TRACIr) platforms, today announced the closing of its previously announced underwritten public offering of 6,150,793 shares of its common stock, which includes the exercise in full by the underwriters of their option to purchase up to 833,333 additional shares of common stock, at a public offering price of $63.00 per share and pre-funded warrants to purchase 238,095 shares of common stock at a price of $62.999 per pre-funded warrant, which represents the per share price for the common stock less the $0.001 per share exercise price for each such pre-funded warrant. The aggregate gross proceeds to Janux from the offering, before deducting underwriting discounts and commissions and other estimated offering expenses and excluding the exercise of any pre-funded warrants, were approximately $402.5 million.

BofA Securities, TD Cowen, Stifel, Cantor and William Blair acted as joint book-running managers for the offering. Wedbush PacGrow, LifeSci Capital, BTIG and Jones acted as co-managers for the offering.

The Company intends to use the net proceeds from the offering to advance clinical development of its internal product pipeline and for general corporate purposes.

The securities were offered by the company pursuant to a Registration Statement on Form S-3 filed with the Securities and Exchange Commission (SEC) that became automatically effective upon filing. A final prospectus supplement and accompanying prospectus relating to the offering were filed with the SEC and are available on the SEC’s website, located at www.sec.gov. Copies of the final prospectus supplement and the accompanying prospectus relating to this offering may be obtained from BofA Securities, NC1-022-02-25, 201 North Tryon Street, Charlotte, North Carolina 28255-0001, Attention: Prospectus Department, or by email at dg.prospectus_requests@bofa.com; TD Securities (USA) LLC, 1 Vanderbilt Avenue, New York, New York 10017, by telephone at (855) 495-9846 or by email at TD.ECM_Prospectus@tdsecurities.com; Stifel, Nicolaus & Company, Incorporated, Attention: Syndicate, One Montgomery Street, Suite 3700, San Francisco, California 94104, by telephone at (415) 364-2720, or by email at syndprospectus@stifel.com; Cantor Fitzgerald & Co., Attention: Capital Markets, 110 East 59th Street, 6th Floor, New York, New York 10022, or by email at prospectus@cantor.com; or William Blair & Company, L.L.C., Attention: Prospectus Department, 150 North Riverside Plaza, Chicago, Illinois 60606, by telephone at (800) 621-0687 or by email at prospectus@williamblair.com.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction.

About Janux Therapeutics, Inc.

Janux is a clinical-stage biopharmaceutical company developing tumor-activated immunotherapies for cancer. Janux’s proprietary technology enabled the development of two distinct bispecific platforms: TRACTr and TRACIr. The goal of both platforms is to provide cancer patients with safe and effective therapeutics that direct and guide their immune system to eradicate tumors while minimizing safety concerns. Janux is currently developing a broad pipeline of TRACTr and TRACIr therapeutics directed at several targets to treat solid tumors. Janux has two TRACTr therapeutic candidates in clinical trials, the first targeting PSMA is in development for prostate cancer, and the second targeting EGFR is being developed for colorectal carcinoma, squamous cell carcinoma of the head and neck, non-small cell lung cancer, renal cell carcinoma, small cell lung cancer, pancreatic ductal adenocarcinoma and triple-negative breast cancer.

Forward-Looking Statements

Statements contained in this press release regarding matters that are not historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include statements regarding, among other things, the anticipated use of proceeds from the public offering. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. These forward-looking statements are based upon Janux’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks and uncertainties associated with market conditions, the satisfaction of customary closing conditions related to the public offering, and the other risks described in Janux’s filings with the SEC. All forward-looking statements contained in this press release speak only as of the date on which they were made. Janux undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made, except as required by law.

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