Over the 90-day window ending February 07, 2026, Mks's three dominant insider ownership positions are held by TenPercentOwner Group Inc. Carlyle (6.48Mn shares), TenPercentOwner Partners Vi Cayman Holdings, L.P. Carlyle (6.48Mn shares), President & Ceo John Tseng-Chung Lee (147.27K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Partners Vi Cayman Holdings, L.P. Carlyle | 6,482,732 | 10 May, 2023 | |
| Group Inc. Carlyle | 6,482,732 | 10 May, 2023 | |
| John Tseng-Chung Lee | President & Ceo | 147,270 | 04 Nov, 2025 |
| Gerard G Colella | 68,234 | 13 May, 2025 | |
| Kathleen Flaherty Burke | Evp And Gc & Secretary | 51,075 | 04 Nov, 2025 |
| James Alan Schreiner | Evp & Coo | 22,535 | 23 Oct, 2025 |
| Elizabeth Mora | 18,963 | 03 Dec, 2025 | |
| Eric Robert Taranto | Evp & Gm And Vsd | 17,467 | 19 Feb, 2025 |
| Mark Milton Gitin | Evp & Gm And Psd | 16,134 | 16 Feb, 2024 |
| David Philip Henry | Evp And Global Str Mktg & Gm And Msd | 15,571 | 19 Sep, 2025 |
| Raj Batra | 15,445 | 13 May, 2025 | |
| Jacqueline F Moloney | 11,562 | 02 Oct, 2025 | |
| Joseph B Donahue | 11,351 | 13 May, 2025 | |
| Michelle M Warner | 10,852 | 08 May, 2024 | |
| Peter Iii Cannone | 9,612 | 13 May, 2025 | |
| Ramakumar Mayampurath | Evp & Cfo | 5,667 | 18 Nov, 2025 |
| Wissam G Jabre | 4,488 | 13 May, 2025 | |
| John Edward Williams | Evp & Gm And Psd | 3,640 | 18 Aug, 2025 |
| Geoffrey Wild | 1,813 | 18 Aug, 2022 | |
| Michelle M Mccarthy | Vp & Chief Accounting Officer | 1,466 | 17 Apr, 2025 |
| Seth H Bagshaw | Evp And Cfo & Treasurer | 1 | 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.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Dec, 2025 | Elizabeth Mora | Common Stock | D | 300 | $158.81 | 18,963 | D | S |
| 17 Nov, 2025 | Ramakumar Mayampurath | Common Stock | A | 8,295 | - | 8,295 | D | M |
| 17 Nov, 2025 | Ramakumar Mayampurath | Common Stock | D | 2,628 | $142.74 | 5,667 | D | F |
| 31 Oct, 2025 | John Tseng-Chung Lee | Common Stock | D | 2,003 | $143.71 | 147,270 | D | F |
| 31 Oct, 2025 | John Tseng-Chung Lee | Common Stock | A | 1,651 | - | 149,273 | D | M |
| 31 Oct, 2025 | John Tseng-Chung Lee | Common Stock | A | 352 | - | 147,622 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | A | 52 | - | 51,285 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | A | 158 | - | 51,233 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | A | 82 | - | 51,367 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | A | 341 | - | 51,852 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | A | 144 | - | 51,511 | D | M |
| 31 Oct, 2025 | Kathleen Flaherty Burke | Common Stock | D | 777 | $143.71 | 51,075 | D | F |
| 22 Oct, 2025 | James Alan Schreiner | Common Stock | D | 711 | $138.68 | 22,535 | D | S |
| 01 Oct, 2025 | Jacqueline F Moloney | Common Stock | D | 300 | $122.14 | 11,562 | D | S |
| 18 Sep, 2025 | James Alan Schreiner | Common Stock | D | 838 | $124.00 | 23,246 | D | S |
| 18 Sep, 2025 | David Philip Henry | - | - | 15,571 | D | |||
| 18 Sep, 2025 | David Philip Henry | Common Stock | D | 5,000 | $130.00 | 15,571 | D | S |
| 02 Sep, 2025 | Elizabeth Mora | Common Stock | D | 300 | $99.85 | 19,263 | D | S |
| 18 Aug, 2025 | James Alan Schreiner | Common Stock | D | 1,249 | $100.22 | 24,084 | D | F |
| 18 Aug, 2025 | James Alan Schreiner | Common Stock | A | 2,641 | - | 25,333 | D | M |