Insider at

04

Insider transactions

05
0 buys (P) 0 sells (S) Net: $0 + 34 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

34 other filings hidden
DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
Dec. 3, 2012 MKSI S 200,000 $24.02 $4,804,000 305,841 Indirect -39.54% Disposed 1062.2% (price as of 2026-10-02)
Dec. 27, 2010 MKSI S 10b5-1 100,000 $24.14 $2,414,000 222,422 Direct -31.02% Disposed 1056.4% (price as of 2026-10-02)
Dec. 23, 2010 MKSI S 10b5-1 100,000 $24.54 $2,454,000 827,788 Indirect -10.78% Disposed 1037.5% (price as of 2026-10-02)
Dec. 7, 2010 MKSI S 37,800 $21.43 $810,054 927,788 Indirect -3.91% Disposed 1202.6% (price as of 2026-10-02)
Dec. 7, 2010 MKSI S 37,800 $21.43 $810,054 321,947 Indirect -10.51% Disposed 1202.6% (price as of 2026-10-02)
Dec. 6, 2010 MKSI S 89,000 $20.90 $1,860,100 965,588 Indirect -8.44% Disposed 1235.6% (price as of 2026-10-02)
Dec. 6, 2010 MKSI S 89,000 $20.90 $1,860,100 359,747 Indirect -19.83% Disposed 1235.6% (price as of 2026-10-02)
Dec. 3, 2010 MKSI S 63,900 $21.07 $1,346,373 1,054,588 Indirect -5.71% Disposed 1224.9% (price as of 2026-10-02)
Dec. 3, 2010 MKSI S 63,900 $21.07 $1,346,373 448,747 Indirect -12.46% Disposed 1224.9% (price as of 2026-10-02)
Dec. 2, 2010 MKSI S 9,300 $21.40 $199,020 1,118,488 Indirect -0.82% Disposed 1204.4% (price as of 2026-10-02)
Dec. 2, 2010 MKSI S 9,300 $21.40 $199,020 512,647 Indirect -1.78% Disposed 1204.4% (price as of 2026-10-02)
Nov. 30, 2010 MKSI S 10b5-1 75,000 $20.47 $1,535,250 447,422 Direct -14.36% Disposed 1263.7% (price as of 2026-10-02)
Nov. 29, 2010 MKSI S 10b5-1 75,000 $20.41 $1,530,750 1,152,788 Indirect -6.11% Disposed 1267.7% (price as of 2026-10-02)
Oct. 26, 2010 MKSI S 10b5-1 75,000 $20.74 $1,555,500 522,422 Direct -12.55% Disposed 1245.9% (price as of 2026-10-02)
Oct. 25, 2010 MKSI S 10b5-1 75,000 $20.64 $1,548,000 1,227,788 Indirect -5.76% Disposed 1252.5% (price as of 2026-10-02)
Aug. 6, 2010 MKSI S 10b5-1 75,000 $20.70 $1,552,500 597,422 Direct -11.15% Disposed 1248.6% (price as of 2026-10-02)
Aug. 5, 2010 MKSI S 10b5-1 75,000 $21.26 $1,594,500 1,302,788 Indirect -5.44% Disposed 1213.0% (price as of 2026-10-02)
July 12, 2010 MKSI S 10b5-1 50,000 $19.74 $987,000 672,422 Direct -6.92% Disposed 1314.1% (price as of 2026-10-02)
July 9, 2010 MKSI S 10b5-1 50,000 $19.71 $985,500 1,377,788 Indirect -3.50% Disposed 1316.3% (price as of 2026-10-02)
June 7, 2010 MKSI S 10b5-1 5,905 $19.03 $112,372 1,427,788 Indirect -0.41% Disposed 1366.9% (price as of 2026-10-02)
May 12, 2010 MKSI S 10b5-1 75,000 $21.45 $1,608,750 494,369 Direct -13.17% Disposed 1201.4% (price as of 2026-10-02)
May 11, 2010 MKSI S 10b5-1 75,000 $20.30 $1,522,500 1,433,693 Indirect -4.97% Disposed 1275.1% (price as of 2026-10-02)
April 15, 2010 MKSI S 10b5-1 75,000 $21.15 $1,586,250 563,369 Direct -11.75% Disposed 1219.9% (price as of 2026-10-02)
April 14, 2010 MKSI S 10b5-1 75,000 $20.80 $1,560,000 1,508,693 Indirect -4.74% Disposed 1242.1% (price as of 2026-10-02)
March 19, 2010 MKSI S 10b5-1 2,289 $19.00 $43,491 638,369 Direct -0.36% Disposed 1369.2% (price as of 2026-10-02)
March 18, 2010 MKSI S 10b5-1 11,437 $19.01 $217,417 1,583,693 Indirect -0.72% Disposed 1368.4% (price as of 2026-10-02)
Feb. 22, 2010 MKSI S 10b5-1 41,599 $19.01 $790,797 640,658 Direct -6.10% Disposed 1368.4% (price as of 2026-10-02)
Feb. 19, 2010 MKSI S 10b5-1 44,091 $19.01 $838,170 1,595,130 Indirect -2.69% Disposed 1368.4% (price as of 2026-10-02)
Oct. 16, 2009 MKSI S 10b5-1 25,000 $19.03 $475,750 812,257 Direct -2.99% Disposed 1366.9% (price as of 2026-10-02)
Oct. 15, 2009 MKSI S 10b5-1 25,540 $19.51 $498,285 1,699,221 Indirect -1.48% Disposed 1330.8% (price as of 2026-10-02)
Sept. 21, 2009 MKSI S 10b5-1 25,817 $19.87 $512,984 837,257 Direct -2.99% Disposed 1304.9% (price as of 2026-10-02)
Sept. 18, 2009 MKSI S 10b5-1 50,000 $20.08 $1,004,000 1,724,761 Indirect -2.82% Disposed 1290.2% (price as of 2026-10-02)
Aug. 18, 2009 MKSI S 10b5-1 25,000 $17.65 $441,250 863,074 Direct -2.82% Disposed 1481.6% (price as of 2026-10-02)
Aug. 17, 2009 MKSI S 10b5-1 25,000 $17.53 $438,250 1,774,761 Indirect -1.39% Disposed 1492.4% (price as of 2026-10-02)
July 22, 2009 MKSI S 10b5-1 25,000 $18.33 $458,250 888,074 Direct -2.74% Disposed 1422.9% (price as of 2026-10-02)
Oct. 15, 2008 MKSI S 10,000 $17.50 $175,000 1,659,074 Direct -0.60% Disposed 1495.1% (price as of 2026-10-02)
Oct. 14, 2008 MKSI S 25,000 $18.03 $450,750 1,799,761 Indirect -1.37% Disposed 1448.3% (price as of 2026-10-02)
Sept. 18, 2008 MKSI S 50,000 $20.16 $1,008,000 1,669,074 Direct -2.91% Disposed 1284.7% (price as of 2026-10-02)
Sept. 17, 2008 MKSI S 50,000 $20.32 $1,016,000 1,824,761 Indirect -2.67% Disposed 1273.8% (price as of 2026-10-02)
Aug. 22, 2008 MKSI S 75,000 $22.60 $1,695,000 1,719,074 Direct -4.18% Disposed 1135.2% (price as of 2026-10-02)
Aug. 21, 2008 MKSI S 75,000 $22.49 $1,686,750 1,874,761 Indirect -3.85% Disposed 1141.2% (price as of 2026-10-02)
July 28, 2008 MKSI S 10b5-1 26,700 $19.91 $531,597 1,794,074 Direct -1.47% Disposed 1302.1% (price as of 2026-10-02)
July 25, 2008 MKSI S 10b5-1 50,000 $20.48 $1,024,000 1,949,761 Indirect -2.50% Disposed 1263.0% (price as of 2026-10-02)
June 24, 2008 MKSI S 10b5-1 73,432 $22.56 $1,656,626 1,820,774 Direct -3.88% Disposed 1137.4% (price as of 2026-10-02)
June 23, 2008 MKSI S 10b5-1 70,000 $22.66 $1,586,200 1,999,761 Indirect -3.38% Disposed 1131.9% (price as of 2026-10-02)
May 28, 2008 MKSI S 10b5-1 75,000 $23.29 $1,746,750 1,894,206 Direct -3.81% Disposed 1098.6% (price as of 2026-10-02)
May 27, 2008 MKSI S 10b5-1 75,000 $23.86 $1,789,500 2,069,761 Indirect -3.50% Disposed 1069.9% (price as of 2026-10-02)
May 1, 2008 MKSI S 10b5-1 75,000 $23.72 $1,779,000 1,965,206 Direct -3.68% Disposed 1076.9% (price as of 2026-10-02)
April 30, 2008 MKSI S 10b5-1 75,000 $23.30 $1,747,500 2,144,761 Indirect -3.38% Disposed 1098.1% (price as of 2026-10-02)
April 4, 2008 MKSI S 10b5-1 75,000 $22.65 $1,698,750 2,040,206 Direct -3.55% Disposed 1132.5% (price as of 2026-10-02)
April 3, 2008 MKSI S 10b5-1 75,000 $22.78 $1,708,500 2,219,761 Indirect -3.27% Disposed 1125.4% (price as of 2026-10-02)
March 10, 2008 MKSI S 10b5-1 46,374 $19.96 $925,625 2,115,206 Direct -2.15% Disposed 1298.5% (price as of 2026-10-02)
March 7, 2008 MKSI S 10b5-1 50,000 $20.02 $1,001,000 2,294,761 Indirect -2.13% Disposed 1294.4% (price as of 2026-10-02)
Feb. 5, 2008 MKSI S 10b5-1 25,000 $18.83 $470,750 2,161,580 Direct -1.14% Disposed 1382.5% (price as of 2026-10-02)
Feb. 4, 2008 MKSI S 10b5-1 25,000 $19.24 $481,000 2,344,761 Indirect -1.05% Disposed 1350.9% (price as of 2026-10-02)
Jan. 8, 2008 MKSI S 10b5-1 900 $17.50 $15,750 2,369,761 Indirect -0.04% Disposed 1495.1% (price as of 2026-10-02)
Jan. 3, 2008 MKSI S 10b5-1 23,300 $18.35 $427,555 2,186,580 Direct -1.05% Disposed 1421.3% (price as of 2026-10-02)
Dec. 13, 2007 MKSI S 10b5-1 25,000 $18.46 $461,500 2,209,880 Direct -1.12% Disposed 1412.2% (price as of 2026-10-02)
Dec. 12, 2007 MKSI S 10b5-1 25,000 $18.67 $466,750 2,370,661 Indirect -1.04% Disposed 1395.2% (price as of 2026-10-02)
Dec. 6, 2007 MKSI S 10b5-1 25,000 $18.37 $459,250 2,234,880 Direct -1.11% Disposed 1419.6% (price as of 2026-10-02)
Dec. 5, 2007 MKSI S 10b5-1 25,000 $17.92 $448,000 2,395,661 Indirect -1.03% Disposed 1457.8% (price as of 2026-10-02)
Nov. 16, 2007 MKSI S 10b5-1 25,000 $17.75 $443,750 2,259,880 Direct -1.09% Disposed 1472.7% (price as of 2026-10-02)
Nov. 15, 2007 MKSI S 10b5-1 25,000 $17.80 $445,000 2,420,661 Indirect -1.02% Disposed 1468.3% (price as of 2026-10-02)
Nov. 8, 2007 MKSI S 10b5-1 1,700 $17.56 $29,852 2,284,880 Direct -0.07% Disposed 1489.7% (price as of 2026-10-02)
Nov. 7, 2007 MKSI S 10b5-1 25,000 $17.63 $440,750 2,445,661 Indirect -1.01% Disposed 1483.4% (price as of 2026-10-02)
Oct. 22, 2007 MKSI S 10b5-1 25,000 $19.47 $486,750 2,286,580 Direct -1.08% Disposed 1333.7% (price as of 2026-10-02)

Showing latest 100 of 259 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.

06
DateTickerSecurityUnderlying Exercise priceExpirationSharesA/D
March 1, 2007 MKSI Stock Option (right to buy) Common (2,318) · Aug. 8, 1988 2,318 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (500) · Aug. 8, 1988 500 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (400) · Aug. 8, 1988 400 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (100) · Aug. 8, 1988 100 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (400) · Aug. 8, 1988 400 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (1,700) · Aug. 8, 1988 1,700 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (500) · Aug. 8, 1988 500 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (100) · Aug. 8, 1988 100 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (500) · Aug. 8, 1988 500 Disposed
March 1, 2007 MKSI Stock Option (right to buy) Common (965) · Aug. 8, 1988 965 Disposed
Sept. 15, 2005 MKSI Stock Option (right to buy) Common (13,804) · Aug. 8, 1988 13,804 Disposed
Oct. 26, 2004 MKSI Stock Option (right to buy) Common (4,601) $0.00 Aug. 8, 1988 4,601 Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).