As of March 23, 2026, the three largest insider holders of TMO are Marc N Casper (Chairman Ceo, 123.93K shares), Michel Lagarde (Executive Vice President, 85.15K shares), Scott M Sperling (Director, 68.98K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Marc N Casper | Chairman Ceo | 123,925 | 0 | 09 Mar, 2026 |
| Michel Lagarde | Executive Vice President | 85,151 | 0 | 02 Mar, 2026 |
| Scott M Sperling | 68,980 | 0 | 11 Dec, 2025 | |
| Mark Stevenson | Retiring Executive Vp Coo | 62,141 | 0 | 01 Mar, 2022 |
| Stephen Williamson | Retiring Sr. Vp And Cfo | 32,499 | 0 | 02 Mar, 2026 |
| Gianluca Pettiti | President Coo | 25,451 | 0 | 02 Mar, 2026 |
| Michael D Shafer | Executive Vice President | 22,557 | 0 | 02 Mar, 2026 |
| Michael D Shafer | Executive Vice President | 20,950 | 0 | 12 Mar, 2026 |
| Frederick M. Lowery | Executive Vice President | 15,044 | 0 | 02 Mar, 2026 |
| Nelson Chai | 14,817 | 0 | 22 May, 2025 | |
| Jim P Manzi | 14,807 | 0 | 07 Feb, 2023 | |
| Lisa P. Britt | Sr. Vp And Chief Hr Officer | 14,784 | 0 | 02 Mar, 2026 |
| Marc N Casper | Chairman Ceo | 0 | 14,608 | 12 Nov, 2024 |
| Stephen Williamson | Sr. Vp And Cfo | 0 | 12,674 | 15 May, 2024 |
| Michael A Boxer | Svp And General Counsel | 10,816 | 0 | 11 Mar, 2025 |
| Thomas J Lynch | 10,257 | 0 | 08 Nov, 2021 | |
| Lars Rebien Sorensen | 9,233 | 0 | 23 May, 2024 | |
| C Martin Harris | 9,033 | 0 | 22 May, 2025 | |
| Tyler Jacks | 8,963 | 0 | 22 May, 2025 | |
| Thomas B Jr. Shropshire | Svp And General Counsel | 6,058 | 0 | 27 Feb, 2026 |
| Dion J Weisler | 5,028 | 0 | 22 May, 2025 | |
| James C Mullen | 3,393 | 0 | 22 May, 2025 | |
| Joseph R. Holmes | Vp Chief Accounting Officer | 2,966 | 0 | 02 Mar, 2026 |
| Ruby R Chandy | 2,964 | 0 | 22 May, 2025 | |
| Debora L Spar | 2,111 | 0 | 22 May, 2025 | |
| R. Alexandra Keith | 2,103 | 0 | 22 May, 2025 | |
| Jennifer M Johnson | 904 | 0 | 22 May, 2025 | |
| Karen S Lynch | 660 | 0 | 22 May, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 11 Mar, 2026 | Michael D Shafer | Common Stock | D | 1,607 | $499.40 | 20,950 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | A | 4,000 | $309.63 | 127,925 | D | M |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 20 | $503.66 | 127,905 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 60 | $505.76 | 127,845 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 58 | $507.54 | 127,787 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 99 | $509.66 | 127,688 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 214 | $511.78 | 127,474 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 411 | $512.73 | 127,063 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 1,133 | $513.71 | 125,930 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 570 | $514.71 | 125,360 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 348 | $515.64 | 125,012 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 201 | $516.73 | 124,811 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 106 | $517.83 | 124,705 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 516 | $519.13 | 124,189 | D | S |
| 05 Mar, 2026 | Marc N Casper | Common Stock | D | 264 | $519.74 | 123,925 | D | S |
| 05 Mar, 2026 | Marc N Casper | Stock Option (Right to Buy) | D | 4,000 | $0.00 | 40,550 | D | M |
| 03 Mar, 2026 | Marc N Casper | Common Stock | A | 5,000 | $309.63 | 128,925 | D | M |
| 03 Mar, 2026 | Marc N Casper | Common Stock | D | 360 | $495.29 | 128,565 | D | S |
| 03 Mar, 2026 | Marc N Casper | Common Stock | D | 480 | $496.84 | 128,085 | D | S |
| 03 Mar, 2026 | Marc N Casper | Common Stock | D | 680 | $498.14 | 127,405 | D | S |