| Insiders | Shares | % | Avg Price | Total $ | |
|---|---|---|---|---|---|
| Buys | 0 | ||||
| Sells | 11 | -83,608 | 100% | $235.15 | -$19,660,508 |
| Net | -11 | -83,608 | -100% | -$19,660,508 |
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Report Date |
|---|---|---|---|---|---|
| Carlyle Group Inc. | 10%+ Owner | $713,103,113 | 08 May 2023 | ||
| Carlyle Partners VI Cayman Holdings, L.P. | 10%+ Owner | $713,103,113 | 08 May 2023 | ||
| John Tseng-Chung Lee | President & CEO, Director | $49,598,861 | -$7,703,242 | -13% | 20 Feb 2026 |
| Kathleen Flaherty Burke | EVP, GC & Secretary | $15,291,432 | -$1,063,500 | -6.5% | 20 Feb 2026 |
| Gerald G. Colella | Director | $12,166,961 | -$5,068,674 | -29% | 20 Feb 2026 |
| Geoffrey Wild | Director | $11,838,269 | 17 Aug 2022 | ||
| James Alan Schreiner | Evp & Coo | $7,453,018 | -$1,346,049 | -15% | 24 Feb 2026 |
| David Philip Henry | EVP, Global Str Mktg & GM, MSD | $6,305,526 | -$1,383,120 | -18% | 20 Feb 2026 |
| Ramakumar Mayampurath | Evp & Cfo | $4,857,795 | 17 Feb 2026 | ||
| Elizabeth Mora | Director | $4,468,763 | -$173,964 | -3.7% | 02 Mar 2026 |
| Eric Robert Taranto | Evp & Gm, Vsd | $4,363,642 | -$1,366,941 | -24% | 06 Mar 2026 |
| Mark Milton Gitin | Evp & Gm, Psd | $3,328,164 | 15 Feb 2024 | ||
| Seth H. Bagshaw | EVP, CFO & Treasurer | $3,135,791 | 22 Feb 2024 | ||
| Jacqueline F. Moloney | Director | $2,221,771 | -$342,196 | -13% | 12 Mar 2026 |
| Peter Cannone III | Director | $2,157,915 | -$322,575 | -13% | 20 Feb 2026 |
| John Edward Williams | Evp & Gm, Psd | $1,501,118 | -$523,744 | -26% | 20 Feb 2026 |
| Michelle M. Warner | Director | $1,443,294 | 07 May 2024 | ||
| Raj Batra | Director | $1,130,598 | 12 May 2025 | ||
| Michelle M. McCarthy | VP & Chief Accounting Officer | $880,802 | -$366,503 | -29% | 20 Feb 2026 |
| Joseph B. Donahue | Director | $830,874 | 12 May 2025 | ||
| Wissam G. Jabre | Director | $328,519 | 12 May 2025 |
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Jacqueline F. Moloney | MKSI | Common Stock | Sale | -3.17% | $72,705 | $213.77 | -340 | 10,393 | 12 Mar 2026 | Direct |
| Eric Robert Taranto | MKSI | Common Stock | Sale | -22.8% | $1,007,318 | $220.52 | -4,568 | 15,445 | 06 Mar 2026 | Direct |
| Elizabeth Mora | MKSI | Common Stock | Sale | -1.58% | $71,832 | $239.44 | -300 | 18,663 | 02 Mar 2026 | Direct |
| James Alan Schreiner | MKSI | Common Stock | Sale | -14.9% | $1,045,500 | $255.00 | -4,100 | 23,402 | 24 Feb 2026 | Direct |
| Gerald G. Colella | MKSI | Common Stock | Sale | -20% | $2,539,675 | $253.97 | -10,000 | 40,017 | 24 Feb 2026 | By The Gerald G. Colella 2019 Trust |
| Gerald G. Colella | MKSI | Common Stock | Sale | -16.7% | $2,528,999 | $252.90 | -10,000 | 50,017 | 20 Feb 2026 | By The Gerald G. Colella 2019 Trust |
| Peter Cannone III | MKSI | Common Stock | Sale | -13% | $322,574 | $258.06 | -1,250 | 8,362 | 20 Feb 2026 | Direct |
| Eric Robert Taranto | MKSI | Common Stock | Sale | -6.77% | $359,623 | $247.55 | -1,453 | 20,013 | 20 Feb 2026 | Direct |
| David Philip Henry | MKSI | Common Stock | Sale | -9.6% | $523,120 | $261.56 | -2,000 | 18,841 | 20 Feb 2026 | Direct |
| Michelle M. McCarthy | MKSI | Common Stock | Sale | -100% | $366,503 | $250.00 | -1,466 | 0 | 20 Feb 2026 | Direct |
| Jacqueline F. Moloney | MKSI | Common Stock | Sale | -7.17% | $205,219 | $247.55 | -829 | 10,733 | 20 Feb 2026 | Direct |
| John Edward Williams | MKSI | Common Stock | Sale | -35.9% | $523,744 | $256.41 | -2,043 | 3,640 | 20 Feb 2026 | Direct |
| Kathleen Flaherty Burke | MKSI | Common Stock | Sale | -7.33% | $1,063,500 | $250.00 | -4,254 | 53,794 | 20 Feb 2026 | Direct |
| John Tseng-Chung Lee | MKSI | Common Stock | Sale | -16.2% | $7,703,242 | $256.77 | -30,000 | 154,696 | 20 Feb 2026 | Direct |
| Eric Robert Taranto | MKSI | Common Stock | Tax liability | -11.2% | -2,712 | 21,465 | 17 Feb 2026 | Direct | ||
| Eric Robert Taranto | MKSI | Common Stock | Options Exercise | 36.6% | 6,473 | 24,177 | 17 Feb 2026 | Direct | ||
| Eric Robert Taranto | MKSI | Restricted Stock Unit | Options Exercise | -44.6% | -6,473 | 8,029 | 17 Feb 2026 | Direct | ||
| Eric Robert Taranto | MKSI | Restricted Stock Unit | Award | 13.8% | 1,759 | 14,502 | 17 Feb 2026 | Direct | ||
| David Philip Henry | MKSI | Common Stock | Tax liability | -16.4% | -4,097 | 20,841 | 17 Feb 2026 | Direct | ||
| David Philip Henry | MKSI | Common Stock | Options Exercise | 59.3% | 9,282 | 24,939 | 17 Feb 2026 | Direct | ||
| David Philip Henry | MKSI | Restricted Stock Unit | Options Exercise | -43.4% | -9,282 | 12,093 | 17 Feb 2026 | Direct | ||
| David Philip Henry | MKSI | Restricted Stock Unit | Award | 13.6% | 2,567 | 21,375 | 17 Feb 2026 | Direct | ||
| James Alan Schreiner | MKSI | Common Stock | Tax liability | -13.6% | -4,344 | 27,502 | 17 Feb 2026 | Direct | ||
| James Alan Schreiner | MKSI | Common Stock | Options Exercise | 40.8% | 9,225 | 31,846 | 17 Feb 2026 | Direct | ||
| James Alan Schreiner | MKSI | Restricted Stock Unit | Options Exercise | -44.7% | -9,225 | 11,396 | 17 Feb 2026 | Direct | ||
| James Alan Schreiner | MKSI | Restricted Stock Unit | Award | 13% | 2,377 | 20,622 | 17 Feb 2026 | Direct | ||
| John Edward Williams | MKSI | Common Stock | Tax liability | -17.4% | -1,195 | 5,683 | 17 Feb 2026 | Direct | ||
| John Edward Williams | MKSI | Common Stock | Options Exercise | 89% | 3,238 | 6,878 | 17 Feb 2026 | Direct | ||
| John Edward Williams | MKSI | Restricted Stock Unit | Options Exercise | -27.5% | -3,238 | 8,553 | 17 Feb 2026 | Direct | ||
| John Edward Williams | MKSI | Restricted Stock Unit | Award | 14.3% | 1,474 | 11,791 | 17 Feb 2026 | Direct | ||
| Ramakumar Mayampurath | MKSI | Common Stock | Tax liability | -22.2% | -2,516 | 8,811 | 17 Feb 2026 | Direct | ||
| Ramakumar Mayampurath | MKSI | Common Stock | Options Exercise | 99.9% | 5,660 | 11,327 | 17 Feb 2026 | Direct | ||
| Ramakumar Mayampurath | MKSI | Restricted Stock Unit | Options Exercise | -19.2% | -5,660 | 23,898 | 17 Feb 2026 | Direct | ||
| Ramakumar Mayampurath | MKSI | Restricted Stock Unit | Award | 16.9% | 4,279 | 29,559 | 17 Feb 2026 | Direct | ||
| Kathleen Flaherty Burke | MKSI | Common Stock | Tax liability | -8.39% | -5,318 | 58,048 | 17 Feb 2026 | Direct | ||
| Kathleen Flaherty Burke | MKSI | Common Stock | Options Exercise | 23.9% | 12,206 | 63,366 | 17 Feb 2026 | Direct | ||
| Kathleen Flaherty Burke | MKSI | Restricted Stock Unit | Options Exercise | -44.6% | -12,206 | 15,129 | 17 Feb 2026 | Direct | ||
| Kathleen Flaherty Burke | MKSI | Restricted Stock Unit | Award | 13.9% | 3,328 | 27,335 | 17 Feb 2026 | Direct | ||
| John Tseng-Chung Lee | MKSI | Common Stock | Tax liability | -15% | -32,548 | 184,696 | 17 Feb 2026 | Direct | ||
| John Tseng-Chung Lee | MKSI | Common Stock | Options Exercise | 47.4% | 69,889 | 217,244 | 17 Feb 2026 | Direct | ||
| John Tseng-Chung Lee | MKSI | Restricted Stock Unit | Options Exercise | -45.2% | -69,889 | 84,828 | 17 Feb 2026 | Direct | ||
| John Tseng-Chung Lee | MKSI | Restricted Stock Unit | Award | 11.2% | 15,593 | 154,717 | 17 Feb 2026 | Direct | ||
| Eric Robert Taranto | MKSI | Restricted Stock Unit | Award | 37.9% | 3,504 | 12,743 | 08 Feb 2026 | Direct | ||
| David Philip Henry | MKSI | Restricted Stock Unit | Award | 41.6% | 5,522 | 18,808 | 08 Feb 2026 | Direct | ||
| James Alan Schreiner | MKSI | Restricted Stock Unit | Award | 40.2% | 5,227 | 18,245 | 08 Feb 2026 | Direct | ||
| John Edward Williams | MKSI | Restricted Stock Unit | Award | 40.5% | 2,973 | 10,317 | 08 Feb 2026 | Direct | ||
| Kathleen Flaherty Burke | MKSI | Restricted Stock Unit | Award | 41.2% | 7,009 | 24,007 | 08 Feb 2026 | Direct | ||
| Ramakumar Mayampurath | MKSI | Restricted Stock Unit | Award | 54.1% | 8,878 | 25,280 | 08 Feb 2026 | Direct | ||
| John Tseng-Chung Lee | MKSI | Restricted Stock Unit | Award | 57.8% | 50,972 | 139,124 | 08 Feb 2026 | Direct | ||
| Elizabeth Mora | MKSI | Common Stock | Sale | -1.56% | $47,643 | $158.81 | -300 | 18,963 | 02 Dec 2025 | Direct |