SCHEDULE
14A INFORMATION
Proxy Statement Pursuant to
Section 14(a) of the Securities
Exchange Act of 1934 (Amendment
No. )
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Filed by
the
Registrant þ |
Filed by
a Party other than the
Registrant o |
Check the appropriate box:
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o
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Preliminary Proxy Statement
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Definitive Proxy Statement
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Definitive Additional Materials
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Soliciting Material Pursuant to
§240.14a-11(c)
or §240.14a-12
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Confidential, for Use of the Commission Only (as permitted by
Rule 14a-6(e)(2))
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MKS Instruments, Inc.
(Name of Registrant as Specified
In Its Charter)
(Name of Person(s) Filing Proxy
Statement)
Payment of Filing Fee (Check the appropriate box):
þ No fee required.
o Fee computed on table below
per Exchange Act Rules 14a-6(i)(1) and 0-11.
1) Title of each class of
securities to which transaction applies:
2) Aggregate number of securities
to which transaction applies:
3) Per unit price or other
underlying value of transaction computed pursuant to Exchange
Act Rule 0-11 (Set forth the amount on
which the filing fee is
calculated and state how it was determined):
4) Proposed maximum aggregate value
of transaction:
5) Total fee paid:
o Fee paid previously with
preliminary materials.
o Check box if any part of
the fee is offset as provided by Exchange Act Rule 0-11(a)(2)
and identify the filing for which the offsetting fee
was paid previously. Identify the
previous filing by registration statement number, or the Form or
Schedule and the date of its filing.
1) Amount Previously Paid:
2) Form, Schedule or Registration
Statement No.:
3) Filing Party:
4) Date Filed:
MKS Instruments, Inc. (the Company) has amended its Proxy Statement, dated March 23, 2009 as
follows. The Company has revised one feature of its proposed amendment to the Companys 2004 Stock
Incentive Plan which allows for an option exchange program. The Company has determined that any
and all options surrendered to the Company pursuant to the option exchange program shall not become
available for the grant of future awards under the 2004 Stock Incentive Plan or any other Company
plan.