| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2005-02-15 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 9,558,000 | 17.8% | EDGAR |
| SC 13G/A | 2005-02-15 | BERTUCCI CLAIRE R | MKS INSTRUMENTS INC | 9,558,000 | 17.8% | EDGAR |
| SC 13G | 2005-02-14 | TCW GROUP INC | MKS INSTRUMENTS INC | 3,065,072 | 5.7% | EDGAR |
| SC 13G/A | 2005-02-11 | PRICE T ROWE ASSOCIATES INC /MD/ | MKS INSTRUMENTS INC | 2,769,913 | 5.1% | EDGAR |
| SC 13G/A | 2004-02-13 | BERTUCCI CLAIRE R | MKS INSTRUMENTS INC | 4,546,784 | 8.5% | EDGAR |
| SC 13G/A | 2004-02-13 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 5,219,723 | 9.8% | EDGAR |
| SC 13G/A | 2004-02-13 | SNYDER JENNIFER C | MKS INSTRUMENTS INC | 2,193,169 | 4.1% | EDGAR |
| SC 13G | 2004-02-09 | PRICE T ROWE ASSOCIATES INC /MD/ | MKS INSTRUMENTS INC | 2,968,913 | 5.7% | EDGAR |
| SC 13D/A | 2004-01-28 | EMERSON ELECTRIC CO | MKS INSTRUMENTS INC | 20,812,739 | 39.2% | EDGAR |
| SC 13D/A | 2003-10-21 | EMERSON ELECTRIC CO | MKS INSTRUMENTS INC | 26,335,134 | 51.5% | EDGAR |
| SC 13D/A | 2003-08-07 | EMERSON ELECTRIC CO | MKS INSTRUMENTS INC | 26,487,134 | 51.5% | EDGAR |
| SC 13G/A | 2003-02-12 | BERTUCCI CLAIRE R | MKS INSTRUMENTS INC | 5,453,927 | 10.6% | EDGAR |
| SC 13G/A | 2003-02-12 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 6,189,095 | 12.1% | EDGAR |
| SC 13G | 2003-02-12 | SNYDER JENNIFER C | MKS INSTRUMENTS INC | 3,456,112 | 6.7% | EDGAR |
| SC 13G/A | 2002-02-11 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 7,890,282 | 20.7% | EDGAR |
| SC 13D | 2002-02-08 | EMERSON ELECTRIC CO | MKS INSTRUMENTS INC | 26,887,542 | 54.0% | EDGAR |
| SC 13G | 2001-05-08 | KOPP INVESTMENT ADVISORS INC | MKS INSTRUMENTS INC | 911,239 | - | EDGAR |
| SC 13G/A | 2001-02-14 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 7,525,739 | 29.4% | EDGAR |
| SC 13D | 2000-10-11 | - | - | - | - | EDGAR |
| SC 13G | 2000-02-11 | BERTUCCI JOHN R | MKS INSTRUMENTS INC | 8,178,110 | 34.0% | EDGAR |