0001127602-11-017281.txt : 20110523 0001127602-11-017281.hdr.sgml : 20110523 20110523150629 ACCESSION NUMBER: 0001127602-11-017281 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20110519 FILED AS OF DATE: 20110523 DATE AS OF CHANGE: 20110523 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: ANDERSON ROBERT R CENTRAL INDEX KEY: 0001202728 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 000-23621 FILM NUMBER: 11864806 MAIL ADDRESS: STREET 1: MKS INSTRUMENTS, INC STREET 2: SIX SHATTUCK ROAD CITY: ANDOVER STATE: MA ZIP: 01810 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: MKS INSTRUMENTS INC CENTRAL INDEX KEY: 0001049502 STANDARD INDUSTRIAL CLASSIFICATION: INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823] IRS NUMBER: 042277512 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 2 TECH DRIVE STREET 2: SUITE 201 CITY: ANDOVER STATE: MA ZIP: 01810 BUSINESS PHONE: 978-645-5500 MAIL ADDRESS: STREET 1: 2 TECH DRIVE STREET 2: SUITE 201 CITY: ANDOVER STATE: MA ZIP: 01810 4 1 form4.xml PRIMARY DOCUMENT X0303 4 2011-05-19 0001049502 MKS INSTRUMENTS INC MKSI 0001202728 ANDERSON ROBERT R 2 TECH DRIVE ANDOVER MA 01810 1 Common Stock 2011-05-19 4 S 0 1953 26.03 D 21000 D This transaction was executed in multiple trades at prices ranging from $26.00 to $26.07 The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected. /s/Renee M. Donlan POA 2011-05-22