Mks Inc (MKSI) Insider Ownership

Historic Insider Ownership Trends

Mks's three largest insider shareholders as of April 25, 2026 are Partners Vi Cayman Holdings, L.P. Carlyle (TenPercentOwner, 6.48Mn shares), Group Inc. Carlyle (TenPercentOwner, 6.48Mn shares), Group Inc. Carlyle (TenPercentOwner, 6.48Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Partners Vi Cayman Holdings, L.P. Carlyle - 0 6,482,732 10 May, 2023
Group Inc. Carlyle - 0 6,482,732 10 May, 2023
Group Inc. Carlyle - 0 6,482,732 10 May, 2023
Partners Vi Cayman Holdings, L.P. Carlyle - 0 6,482,732 10 May, 2023
Partners Vi Cayman Holdings, L.P. Carlyle - 0 6,482,732 10 May, 2023
Group Inc. Carlyle - 0 6,482,732 10 May, 2023
Group Inc. Carlyle - 0 6,482,732 10 May, 2023
Group Inc. Carlyle - 0 6,482,732 10 May, 2023
John Tseng-Chung Lee President Ceo 154,696 0 23 Feb, 2026
Gerard G Colella Ceo, Director 0 68,017 12 Feb, 2024
Kathleen Flaherty Burke Evp, Gc Secretary 53,794 0 23 Feb, 2026
Gerald G Colella - 0 40,017 24 Feb, 2026
James Alan Schreiner Evp Coo 23,402 0 25 Feb, 2026
James Alan Schreiner Evp Coo 23,402 0 25 Feb, 2026
James Alan Schreiner Evp Coo 23,402 0 25 Feb, 2026
David Philip Henry Evp, Global Str Mktg Gm, Msd 18,841 0 23 Feb, 2026
Mark Milton Gitin Evp Gm, Psd 16,134 0 16 Feb, 2024
Raj Batra - 15,445 0 13 May, 2025
Eric Robert Taranto Evp Gm, Vsd 15,445 0 09 Mar, 2026
Eric Robert Taranto Evp Gm, Vsd 15,445 0 09 Mar, 2026
Eric Robert Taranto Evp Gm, Vsd 15,445 0 09 Mar, 2026
Joseph B Donahue - 11,351 0 13 May, 2025
Michelle M Warner - 10,852 0 08 May, 2024
Michelle M Warner - 10,852 0 08 May, 2024
Michelle M Warner - 10,852 0 08 May, 2024
Jacqueline F Moloney - 10,393 0 13 Mar, 2026
Jacqueline F Moloney - 10,393 0 13 Mar, 2026
Jacqueline F Moloney - 10,393 0 13 Mar, 2026
Ramakumar Mayampurath Evp Cfo 8,811 0 18 Feb, 2026
Ramakumar Mayampurath Evp Cfo 8,811 0 18 Feb, 2026
Ramakumar Mayampurath Evp Cfo 8,811 0 18 Feb, 2026
Peter Iii Cannone - 8,362 0 23 Feb, 2026
Gerard G Colella Ceo, Director 8,217 0 13 May, 2025
John Edward Williams Evp Gm, Psd 4,555 0 20 Apr, 2026
Wissam G Jabre - 4,488 0 13 May, 2025
Michelle M Mccarthy Svp Chief Accounting Officer 2,436 0 16 Apr, 2026
Michelle M Mccarthy Svp Chief Accounting Officer 2,436 0 16 Apr, 2026
Geoffrey Wild - 1,813 0 18 Aug, 2022
Geoffrey Wild - 1,813 0 18 Aug, 2022
Geoffrey Wild - 1,813 0 18 Aug, 2022
Seth H Bagshaw Evp, Cfo Treasurer 1 0 26 Feb, 2024

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
17 Apr, 2026 John Edward Williams Common Stock A 1,741 - 5,381 D M
17 Apr, 2026 John Edward Williams Common Stock D 826 $269.89 4,555 D F
17 Apr, 2026 John Edward Williams Restricted Stock Unit D 1,741 - 6,812 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 968 - 968 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 968 - 968 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 1,107 - 2,075 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 1,107 - 2,075 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 1,736 - 3,811 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock A 1,736 - 3,811 D M
15 Apr, 2026 Michelle M Mccarthy Common Stock D 1,375 $274.15 2,436 D F
15 Apr, 2026 Michelle M Mccarthy Common Stock D 1,375 $274.15 2,436 D F
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit A 1,673 - 11,199 D A
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit A 1,673 - 11,199 D A
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 968 - 10,231 D M
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 968 - 10,231 D M
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 1,107 - 9,124 D M
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 1,107 - 9,124 D M
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 1,736 - 7,388 D M
15 Apr, 2026 Michelle M Mccarthy Restricted Stock Unit D 1,736 - 7,388 D M
12 Mar, 2026 Jacqueline F Moloney Common Stock D 340 $213.77 10,393 D S