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).
| 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.
| 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 |