Company:  MKS INSTRUMENTS INC (MKSI)
Form Type:  10-Q
Filing Date:  8/7/2009 
CIK:  0001049502 
Address:  2 TECH DRIVE
SUITE 201 
City, State, Zip:  ANDOVER, Massachusetts 01810 
Telephone:  978-645-5500 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$18.55   		Change: 
0.41 (2.26%)  
Trade Time: 
Feb 09   		Market Cap: 
$918.37M
Description of Business
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  FORM 10-Q
    PART I. FINANCIAL INFORMATION
      ITEM 1. FINANCIAL STATEMENTS.
        BALANCE SHEET
        INCOME STATEMENT
        CASH FLOW
        NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS
          CASH FLOW
      ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL ...
      ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT ...
      ITEM 4. CONTROLS AND PROCEDURES.
    PART II. OTHER INFORMATION
      ITEM 1. LEGAL PROCEEDINGS.
      ITEM 1A. RISK FACTORS.
      ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF ...
      ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.
      ITEM 6. EXHIBITS.
    SIGNATURE
  EXHIBIT 31.1
    CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
  EXHIBIT 31.2
    CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER
  EXHIBIT 32.1
    CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL ...
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