MKSINasdaq · Industrial Instruments For Measurement, Display, and Control

MKS INC

Alert me on MKSI

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Sep 2 Sale Mora Elizabeth Insider

1 week

+4.2%S&P −1.0%

1 month

+11.0%S&P +0.8%

3 months

Result in27 trading days

6 months

Result in90 trading days

Aug 17 Sale Lee John Tseng-Chung Insider

1 week

−16.1%S&P −1.2%

1 month

−26.6%S&P −2.4%

3 months

Result in15 trading days

6 months

Result in78 trading days

Aug 4 Sale Williams John Edward Insider

1 week

−8.2%S&P −0.1%

1 month

−21.6%S&P −0.8%

3 months

Result in6 trading days

6 months

Result in69 trading days

Jun 17 Sale Schreiner James Alan Insider

1 week

+10.5%S&P −0.6%

1 month

−12.7%S&P +0.4%

3 months

−35.2%S&P +3.2%

6 months

Result in37 trading days

Jun 11 Sale Schreiner James Alan Insider

1 week

+17.7%S&P +1.5%

1 month

+3.8%S&P +2.2%

3 months

−22.5%S&P +3.9%

6 months

Result in33 trading days

Show all 40

Jun 8 Sale McCarthy Michelle M Insider

1 week

+20.3%S&P +2.1%

1 month

+18.2%S&P +1.9%

3 months

−14.8%S&P +3.9%

6 months

Result in30 trading days

Jun 2 Sale Henry David Philip Insider

1 week

−3.1%S&P −3.0%

1 month

+10.4%S&P −1.7%

3 months

−25.5%S&P +0.5%

6 months

Result in26 trading days

Jun 2 Sale Mora Elizabeth Insider

1 week

−3.1%S&P −3.0%

1 month

+10.4%S&P −1.7%

3 months

−25.5%S&P +0.5%

6 months

Result in26 trading days

May 28 Sale COLELLA GERALD G Insider

1 week

+2.2%S&P +0.3%

1 month

+28.7%S&P −1.6%

3 months

−16.1%S&P +2.4%

6 months

Result in23 trading days

May 28 Sale Donahue Joseph B Insider

1 week

+2.2%S&P +0.3%

1 month

+28.7%S&P −1.6%

3 months

−16.1%S&P +2.4%

6 months

Result in23 trading days

May 28 Sale Henry David Philip Insider

1 week

+2.2%S&P +0.3%

1 month

+28.7%S&P −1.6%

3 months

−16.1%S&P +2.4%

6 months

Result in23 trading days

May 26 Sale Lee John Tseng-Chung Insider

1 week

−0.8%S&P +1.2%

1 month

+22.9%S&P −1.9%

3 months

−18.9%S&P +2.3%

6 months

Result in21 trading days

May 26 Sale Mayampurath Ramakumar Insider

1 week

−0.8%S&P +1.2%

1 month

+22.9%S&P −1.9%

3 months

−18.9%S&P +2.3%

6 months

Result in21 trading days

May 19 Sale CANNONE PETER III Insider

1 week

+11.6%S&P +2.3%

1 month

+38.3%S&P +2.0%

3 months

−4.2%S&P +5.1%

6 months

Result in17 trading days

May 15 Sale Moloney Jacqueline F Insider

1 week

+5.8%S&P +0.9%

1 month

+20.9%S&P +1.5%

3 months

+5.9%S&P +4.8%

6 months

Result in15 trading days

May 14 Sale Moloney Jacqueline F Insider

1 week

−0.2%S&P −0.7%

1 month

+19.7%S&P +0.9%

3 months

−0.9%S&P +4.0%

6 months

Result in14 trading days

May 12 Sale Burke Kathleen Flaherty Insider

1 week

−5.7%S&P −0.6%

1 month

+10.9%S&P −0.1%

3 months

−1.5%S&P +4.9%

6 months

Result in12 trading days

May 12 Sale Taranto Eric Robert Insider

1 week

−5.7%S&P −0.6%

1 month

+10.9%S&P −0.1%

3 months

−1.5%S&P +4.9%

6 months

Result in12 trading days

Mar 13 Sale Moloney Jacqueline F Insider

1 week

+6.4%S&P −1.8%

1 month

+28.4%S&P +5.1%

3 months

+66.8%S&P +12.3%

6 months

+12.3%S&P +15.5%

Mar 9 Sale Taranto Eric Robert Insider

1 week

+1.6%S&P −1.4%

1 month

+17.2%S&P −0.1%

3 months

+43.0%S&P +9.3%

6 months

+21.8%S&P +13.5%

Mar 3 Sale Mora Elizabeth Insider

1 week

−3.1%S&P −0.5%

1 month

+1.5%S&P −3.4%

3 months

+42.5%S&P +12.0%

6 months

+6.1%S&P +12.6%

Feb 25 Sale Schreiner James Alan Insider

1 week

−8.1%S&P −1.2%

1 month

−12.0%S&P −6.7%

3 months

+28.2%S&P +8.6%

6 months

+6.4%S&P +11.1%

Feb 24 Sale COLELLA GERALD G Insider

1 week

−7.5%S&P −1.0%

1 month

−3.1%S&P −4.2%

3 months

+32.9%S&P +9.5%

6 months

+7.8%S&P +12.0%

Feb 23 Sale Williams John Edward Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale McCarthy Michelle M Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale Burke Kathleen Flaherty Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale Taranto Eric Robert Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale Henry David Philip Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale Lee John Tseng-Chung Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale Moloney Jacqueline F Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Feb 23 Sale CANNONE PETER III Insider

1 week

−3.7%S&P +0.6%

1 month

−4.0%S&P −4.0%

3 months

+26.4%S&P +9.6%

6 months

+6.1%S&P +12.5%

Dec 3, 2025 Sale Mora Elizabeth Insider

1 week

+2.7%S&P +0.5%

1 month

+7.8%S&P +0.9%

3 months

+28.6%S&P −1.4%

6 months

+84.9%S&P +8.5%

Nov 21, 2025 Buy Rep. Lisa McClain House

1 week

+7.3%S&P +1.9%

1 month

+9.0%S&P +3.5%

3 months

+63.3%S&P +3.4%

6 months

+115.9%S&P +13.5%

Nov 21, 2025 Sale Rep. Lisa McClain House

1 week

+7.3%S&P +1.9%

1 month

+9.0%S&P +3.5%

3 months

+63.3%S&P +3.4%

6 months

+115.9%S&P +13.5%

Oct 23, 2025 Sale Schreiner James Alan Insider

1 week

−1.0%S&P +1.2%

1 month

+2.4%S&P −1.9%

3 months

+55.7%S&P +3.4%

6 months

+98.4%S&P +7.1%

Oct 2, 2025 Sale Moloney Jacqueline F Insider

1 week

−1.7%S&P +0.3%

1 month

+5.3%S&P +1.9%

3 months

+23.5%S&P +2.4%

6 months

+74.0%S&P −1.0%

Sep 19, 2025 Sale Henry David Philip Insider

1 week

−5.3%S&P −0.3%

1 month

+10.1%S&P +1.1%

3 months

+22.3%S&P +1.9%

6 months

+83.2%S&P −0.7%

Sep 19, 2025 Sale Schreiner James Alan Insider

1 week

−5.3%S&P −0.3%

1 month

+10.1%S&P +1.1%

3 months

+22.3%S&P +1.9%

6 months

+83.2%S&P −0.7%

Sep 12, 2025 Buy Rep. Lisa McClain House

1 week

+9.9%S&P +1.2%

1 month

+14.0%S&P +0.5%

3 months

+34.0%S&P +3.4%

6 months

+97.2%S&P +2.1%

Sep 3, 2025 Sale Mora Elizabeth Insider

1 week

+10.3%S&P +1.3%

1 month

+36.2%S&P +4.2%

3 months

+60.8%S&P +6.2%

6 months

+130.5%S&P +6.4%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for MKSI

113 held · newest 5113 held · newest 2

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Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Aug 31, 2026 Schedule 13G, amended

JPMORGAN CHASE & CO.: 2.9%, 2,005,756 shares

Jun 30, 2026 Schedule 13G, amended

Victory Capital Management, Inc.: 0.9%, 604,690 shares

Jun 30, 2026 Schedule 13G

JPMORGAN CHASE & CO: 5%, 3,417,585 shares

Mar 31, 2026 Schedule 13G, amended

FMR LLC: 3.3%, 2,243,989 shares

Mar 31, 2026 Schedule 13G

Vanguard Capital Management: 5.2%, 3,528,836 shares

Mar 31, 2026 Schedule 13G

Vanguard Portfolio Management: 5.5%, 3,700,062 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

T. Rowe Price Associates, Inc.: 4.1%, 2,753,871 shares

Dec 31, 2025 Schedule 13G

Invesco Ltd.: 6.5%, 4,394,205 shares

Sep 30, 2025 Schedule 13G, amended

The Vanguard Group: 11.5%, 7,752,097 shares

Sep 30, 2025 Schedule 13G, amended

BlackRock, Inc.: 8.8%, 5,887,663 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

No lobbying reports on file.