Insider at

04

Insider transactions

05
0 buys (P) 4 sells (S) Net: $-290,169 + 25 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

25 other filings hidden
DateTickerCodeSharesPriceValue Owned afterΔ ownA/Dvs now
Sept. 1, 2026 MKSI S 10b5-1 300 $250.96 $75,288 18,845 Direct -1.57% Disposed 11.8% (price as of 2026-10-05)
June 1, 2026 MKSI S 10b5-1 300 $318.02 $95,406 19,145 Direct -1.54% Disposed -11.8% (price as of 2026-10-05)
March 2, 2026 MKSI S 10b5-1 300 $239.44 $71,832 18,663 Direct -1.58% Disposed 17.1% (price as of 2026-10-05)
Dec. 2, 2025 MKSI S 10b5-1 300 $158.81 $47,643 18,963 Direct -1.56% Disposed 76.6% (price as of 2026-10-05)
Sept. 2, 2025 MKSI S 10b5-1 300 $99.85 $29,955 19,263 Direct -1.53% Disposed 180.9% (price as of 2026-10-05)
June 2, 2025 MKSI S 10b5-1 300 $81.78 $24,534 19,563 Direct -1.51% Disposed 243.0% (price as of 2026-10-05)
March 3, 2025 MKSI S 10b5-1 275 $92.46 $25,426 17,384 Direct -1.56% Disposed 203.4% (price as of 2026-10-05)
Dec. 2, 2024 MKSI S 10b5-1 275 $113.41 $31,188 17,659 Direct -1.53% Disposed 147.3% (price as of 2026-10-05)
Sept. 3, 2024 MKSI S 10b5-1 275 $115.97 $31,892 17,934 Direct -1.51% Disposed 141.9% (price as of 2026-10-05)
June 3, 2024 MKSI S 10b5-1 275 $129.41 $35,588 18,209 Direct -1.49% Disposed 116.8% (price as of 2026-10-05)
April 1, 2024 MKSI S 10b5-1 250 $133.00 $33,250 16,862 Direct -1.46% Disposed 110.9% (price as of 2026-10-05)
Jan. 2, 2024 MKSI S 10b5-1 250 $100.90 $25,225 17,112 Direct -1.44% Disposed 178.0% (price as of 2026-10-05)
Oct. 2, 2023 MKSI S 10b5-1 250 $87.15 $21,788 17,362 Direct -1.42% Disposed 221.9% (price as of 2026-10-05)
July 3, 2023 MKSI S 10b5-1 250 $108.49 $27,122 17,612 Direct -1.40% Disposed 158.5% (price as of 2026-10-05)
June 1, 2023 MKSI S 10b5-1 200 $97.16 $19,432 17,862 Direct -1.11% Disposed 188.7% (price as of 2026-10-05)
March 15, 2023 MKSI S 10b5-1 200 $86.67 $17,334 15,693 Direct -1.26% Disposed 223.6% (price as of 2026-10-05)
Dec. 1, 2022 MKSI S 10b5-1 200 $83.86 $16,772 15,893 Direct -1.24% Disposed 234.5% (price as of 2026-10-05)
Sept. 1, 2022 MKSI S 10b5-1 200 $96.72 $19,344 16,093 Direct -1.23% Disposed 190.0% (price as of 2026-10-05)
March 1, 2022 MKSI S 10b5-1 300 $149.99 $44,997 14,548 Direct -2.02% Disposed 87.0% (price as of 2026-10-05)
Dec. 1, 2021 MKSI S 10b5-1 300 $155.91 $46,773 14,848 Direct -1.98% Disposed 79.9% (price as of 2026-10-05)
Sept. 1, 2021 MKSI S 10b5-1 300 $148.10 $44,430 15,148 Direct -1.94% Disposed 89.4% (price as of 2026-10-05)
June 1, 2021 MKSI S 10b5-1 300 $190.00 $57,000 15,448 Direct -1.91% Disposed 47.6% (price as of 2026-10-05)
March 1, 2021 MKSI S 10b5-1 450 $168.00 $75,600 14,601 Direct -2.99% Disposed 67.0% (price as of 2026-10-05)
Dec. 1, 2020 MKSI S 10b5-1 450 $139.54 $62,793 15,051 Direct -2.90% Disposed 101.0% (price as of 2026-10-05)
Sept. 1, 2020 MKSI S 10b5-1 450 $120.28 $54,126 15,501 Direct -2.82% Disposed 133.2% (price as of 2026-10-05)
June 1, 2020 MKSI S 10b5-1 450 $105.09 $47,290 15,951 Direct -2.74% Disposed 166.9% (price as of 2026-10-05)
May 5, 2020 MKSI S 1,005 $96.76 $97,244 14,413 Direct -6.52% Disposed 189.9% (price as of 2026-10-05)
March 2, 2020 MKSI S 10b5-1 400 $100.68 $40,272 15,418 Direct -2.53% Disposed 178.6% (price as of 2026-10-05)
Dec. 2, 2019 MKSI S 10b5-1 400 $106.92 $42,768 15,818 Direct -2.47% Disposed 162.3% (price as of 2026-10-05)
Sept. 3, 2019 MKSI S 10b5-1 400 $77.00 $30,800 16,218 Direct -2.41% Disposed 264.3% (price as of 2026-10-05)
June 3, 2019 MKSI S 10b5-1 400 $71.93 $28,772 16,618 Direct -2.35% Disposed 290.0% (price as of 2026-10-05)
March 1, 2019 MKSI S 10b5-1 375 $83.90 $31,462 15,037 Direct -2.43% Disposed 234.3% (price as of 2026-10-05)
Dec. 3, 2018 MKSI S 10b5-1 375 $79.90 $29,962 15,412 Direct -2.38% Disposed 251.1% (price as of 2026-10-05)
Sept. 4, 2018 MKSI S 10b5-1 375 $92.50 $34,688 15,787 Direct -2.32% Disposed 203.2% (price as of 2026-10-05)
June 1, 2018 MKSI S 10b5-1 375 $113.40 $42,525 16,162 Direct -2.27% Disposed 147.4% (price as of 2026-10-05)
May 16, 2018 MKSI S 516 $116.42 $60,073 16,537 Direct -3.03% Disposed 140.9% (price as of 2026-10-05)
March 1, 2018 MKSI S 10b5-1 300 $111.10 $33,330 15,554 Direct -1.89% Disposed 152.5% (price as of 2026-10-05)
Dec. 1, 2017 MKSI S 10b5-1 300 $94.10 $28,230 15,854 Direct -1.86% Disposed 198.1% (price as of 2026-10-05)
Sept. 1, 2017 MKSI S 10b5-1 300 $82.80 $24,840 16,154 Direct -1.82% Disposed 238.8% (price as of 2026-10-05)
June 1, 2017 MKSI S 10b5-1 300 $81.90 $24,570 16,454 Direct -1.79% Disposed 242.5% (price as of 2026-10-05)
May 3, 2017 MKSI S 10b5-1 200 $80.00 $16,000 14,765 Direct -1.34% Disposed 250.6% (price as of 2026-10-05)
Feb. 1, 2017 MKSI S 10b5-1 200 $66.60 $13,320 14,965 Direct -1.32% Disposed 321.2% (price as of 2026-10-05)
Nov. 1, 2016 MKSI S 10b5-1 200 $50.50 $10,100 15,165 Direct -1.30% Disposed 455.4% (price as of 2026-10-05)
Aug. 3, 2016 MKSI S 10b5-1 200 $45.17 $9,034 15,365 Direct -1.28% Disposed 521.0% (price as of 2026-10-05)
May 4, 2015 MKSI S 2,800 $35.39 $99,092 7,774 Direct -26.48% Disposed 692.6% (price as of 2026-10-05)
Dec. 2, 2014 MKSI S 1,875 $36.09 $67,669 10,574 Direct -15.06% Disposed 677.2% (price as of 2026-10-05)
July 28, 2014 MKSI S 2,000 $31.97 $63,940 12,449 Direct -13.84% Disposed 777.4% (price as of 2026-10-05)
Feb. 4, 2014 MKSI S 1,875 $29.75 $55,781 10,043 Direct -15.73% Disposed 842.9% (price as of 2026-10-05)

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.

Initial ownership (Form 3) 1 holding

07

Securities held when first becoming an insider, per SEC Form 3.

DateTickerSecuritySharesOwnership
May 8, 2012 MKSI Common Stock 7,500 Direct