Mks's top three insider shareholders as of September 29, 2026 are Group Inc. Carlyle (TenPercentOwner, 6.48Mn shares), Partners Vi Cayman Holdings, L.P. Carlyle (TenPercentOwner, 6.48Mn shares), John Tseng-Chung Lee (President Ceo, 134.78K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Group Inc. Carlyle | TenPercentOwner | 0 | 6,482,732 | 6,482,732 | 48.7% | 10 May, 2023 |
| 2 | Partners Vi Cayman Holdings, L.P. Carlyle | TenPercentOwner | 0 | 6,482,732 | 6,482,732 | 48.7% | 10 May, 2023 |
| 3 | John Tseng-Chung Lee | President Ceo | 134,776 | 0 | 134,776 | 1.0% | 17 Aug, 2026 |
| 4 | Kathleen Flaherty Burke | Evp, Gc Secretary | 49,439 | 0 | 49,439 | 0.4% | 12 May, 2026 |
| 5 | Gerald G Colella | Director | 0 | 20,017 | 20,017 | 0.2% | 28 May, 2026 |
| 6 | James Alan Schreiner | Evp Coo | 19,201 | 0 | 19,201 | 0.1% | 16 Jun, 2026 |
| 7 | Elizabeth Mora | Director | 18,845 | 0 | 18,845 | 0.1% | 02 Sep, 2026 |
| 8 | Raj Batra | Director | 16,227 | 0 | 16,227 | 0.1% | 12 May, 2026 |
| 9 | Mark Milton Gitin | Evp Gm, Psd | 16,134 | 0 | 16,134 | 0.1% | 16 Feb, 2024 |
| 10 | Eric Robert Taranto | Evp Gm, Vsd | 12,596 | 0 | 12,596 | 0.1% | 12 May, 2026 |
| 11 | Michelle M Warner | Director | 10,852 | 0 | 10,852 | 0.1% | 08 May, 2024 |
| 12 | David Philip Henry | Evp, Global Str Mktg Gm, Msd | 10,422 | 0 | 10,422 | 0.1% | 02 Jun, 2026 |
| 13 | Joseph B Donahue | Director | 10,033 | 0 | 10,033 | 0.1% | 28 May, 2026 |
| 14 | Jacqueline F Moloney | Director | 8,775 | 0 | 8,775 | 0.1% | 15 May, 2026 |
| 15 | Peter Iii Cannone | Director | 7,794 | 0 | 7,794 | 0.1% | 19 May, 2026 |
| 16 | Wissam G Jabre | Director | 5,270 | 0 | 5,270 | 0.0% | 12 May, 2026 |
| 17 | John Edward Williams | Evp Gm, Psd | 4,098 | 0 | 4,098 | 0.0% | 04 Aug, 2026 |
| 18 | Geoffrey Wild | Director | 1,813 | 0 | 1,813 | 0.0% | 18 Aug, 2022 |
| 19 | Michelle M Mccarthy | Svp Chief Accounting Officer | 2 | 0 | 2 | 0.0% | 08 Jun, 2026 |
| 20 | Ramakumar Mayampurath | Evp Cfo | 1 | 0 | 1 | 0.0% | 26 May, 2026 |
| 21 | Seth H Bagshaw | Evp, Cfo Treasurer | 1 | 0 | 1 | 0.0% | 26 Feb, 2024 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 01 Sep, 2026 | Elizabeth Mora | Director | Disposed S | 300 | $250.96 | $75.29K | 18,845 | Direct |
| 17 Aug, 2026 | Renee Martel Donlan | Evp, Gc Cco | Acquired A | 954 | — | — | 4,781 | Direct |
| 14 Aug, 2026 | John Tseng-Chung Lee | President Ceo | Disposed S | 10,000 | $302.01 | $3.02Mn | 134,776 | Direct |
| 03 Aug, 2026 | John Edward Williams | Evp Gm, Psd | Disposed S | 457 | $288.31 | $131.76K | 4,098 | Direct |
| 12 Jun, 2026 | James Alan Schreiner | Evp Coo | Disposed S | 2,471 | $345.52 | $853.79K | 20,230 | Direct |
| 12 Jun, 2026 | James Alan Schreiner | Evp Coo | Disposed S | 812 | $346.41 | $281.28K | 19,418 | Direct |
| 12 Jun, 2026 | James Alan Schreiner | Evp Coo | Disposed S | 217 | $347.00 | $75.30K | 19,201 | Direct |
| 10 Jun, 2026 | James Alan Schreiner | Evp Coo | Disposed S | 781 | $317.42 | $247.91K | 22,701 | Direct |
| 05 Jun, 2026 | Michelle M Mccarthy | Svp Chief Accounting Officer | Disposed S | 2,434 | $315.23 | $767.27K | 2 | Direct |
| 01 Jun, 2026 | David Philip Henry | Evp, Global Str Mktg Gm, Msd | Disposed S | 6,000 | $314.43 | $1.89Mn | 10,422 | Direct |
| 01 Jun, 2026 | Elizabeth Mora | Director | Disposed S | 300 | $318.02 | $95.41K | 19,145 | Direct |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 464 | $330.38 | $153.30K | 39,553 | Indirect |
| 27 May, 2026 | Joseph B Donahue | Director | Disposed S | 2,100 | $327.95 | $688.70K | 10,033 | Direct |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 8,210 | $331.45 | $2.72Mn | 31,343 | Indirect |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 4,876 | $332.04 | $1.62Mn | 26,467 | Indirect |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 1,811 | $335.46 | $607.51K | 24,656 | Indirect |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 1,626 | $336.54 | $547.22K | 23,030 | Indirect |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 213 | $337.05 | $71.79K | 22,817 | Indirect |
| 27 May, 2026 | Gerald G Colella | Director | Disposed S | 2,800 | $338.58 | $948.02K | 20,017 | Indirect |
| 26 May, 2026 | David Philip Henry | Evp, Global Str Mktg Gm, Msd | Disposed S | 2,500 | $330.50 | $826.25K | 16,341 | Direct |