MKS Instruments, Inc. Watch

from 10-K 3 pages MKS Instruments, Inc. Description of Capital Stock Registered Under Section 12 of the Exchange Act

from 10-K 2 pages MKS Instruments, Inc. Stockholder the Corporation Upon Written Has Request, More Than a Copy One of Class the Full of Stock Text Ofauthorized the Preferences,voting to Be Issuedpowers, . the Corporation Qualifications Willand Furnish Special Without and Relative Charge Rights to Each of the Shares of Each Class of Stock (And Any Series Thereof) Authorized to Be Issued by the Corporation. Lawsthe or Regulations: Following Abbreviations, When Used in the Inscription on the Face of This Certificate, Shall Be Construed as Though They Were Written Out in Full According to Applicable Ten Com as Tenants in Common Ten Ent as Tenants by Entireties Jt Ten as Join Tenants With Right of Survivorship and Not as Tenants in Common Unif Gift Min Act (Cust) Custodian (Minor) Under Uniform Gifts to Minors Act (State) Additional Abbreviations May Also Be Used Though Not in the Above List. for Value Received, Hereby Sell, Assign and Transfer Unto Please Identifying Insert Social Number Security of Assignee or Other (Please Print or Typewrite Name and Address, Including Zip Code, of Assignee) Shares of the Capital Stock Represented by the Within Certificate, and Do Hereby Irrevocably Constitute and Appoint Attorney to Transfer the Said Stock on the Books of the Within Named Corporation With Full Power of Substitution in the Premises. Dated (Signature) Notice: The Signature to This Assignment Must Correspond With the Name as Written Upon the Face of the Certificate in Every Particular, Without Alteration or Enlargement or Any Change Whatever

from 8-K ~20 pages Shareholders Agreement Dated January 31, 2002

from SC 13D ~5 pages Indenture or similar

from S-8 ~10 pages 1993 Stock Option Plan

from S-8 ~10 pages Amended and Restated 1995 Stock Option Plan

from S-8 ~10 pages 1994 Formula Stock Option Plan

from S-1 ~1 page Specimen Certificate Representing Common Stock

from S-1/A ~1 page Specimen Certificate Representing Common Stock