As of August 27, 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).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Marc N Casper | Chairman Ceo | 123,925 | 0 | 123,925 | 22.0% | 26 Aug, 2026 |
| 2 | Michel Lagarde | Executive Vice President | 85,151 | 0 | 85,151 | 15.1% | 02 Mar, 2026 |
| 3 | Scott M Sperling | Director | 69,479 | 0 | 69,479 | 12.3% | 22 May, 2026 |
| 4 | Mark Stevenson | Retiring Executive Vp Coo | 62,141 | 0 | 62,141 | 11.0% | 01 Mar, 2022 |
| 5 | Stephen Williamson | Retiring Sr. Vp And Cfo | 32,499 | 0 | 32,499 | 5.8% | 02 Mar, 2026 |
| 6 | Gianluca Pettiti | President Coo | 24,651 | 0 | 24,651 | 4.4% | 28 Jul, 2026 |
| 7 | Michael D Shafer | Executive Vice President | 20,994 | 0 | 20,994 | 3.7% | 13 Aug, 2026 |
| 8 | Nelson Chai | Director | 15,316 | 0 | 15,316 | 2.7% | 22 May, 2026 |
| 9 | Frederick M. Lowery | Executive Vice President | 15,044 | 0 | 15,044 | 2.7% | 02 Mar, 2026 |
| 10 | Jim P Manzi | Director | 14,807 | 0 | 14,807 | 2.6% | 07 Feb, 2023 |
| 11 | Lisa P. Britt | Sr. Vp And Chief Hr Officer | 14,784 | 0 | 14,784 | 2.6% | 20 Aug, 2026 |
| 12 | Michael A Boxer | Svp And General Counsel | 10,816 | 0 | 10,816 | 1.9% | 11 Mar, 2025 |
| 13 | Thomas J Lynch | Director | 10,257 | 0 | 10,257 | 1.8% | 08 Nov, 2021 |
| 14 | C Martin Harris | Director | 9,532 | 0 | 9,532 | 1.7% | 22 May, 2026 |
| 15 | Tyler Jacks | Director | 9,462 | 0 | 9,462 | 1.7% | 22 May, 2026 |
| 16 | Lars Rebien Sorensen | Director | 9,233 | 0 | 9,233 | 1.6% | 23 May, 2024 |
| 17 | Thomas B Jr. Shropshire | Svp And General Counsel | 6,058 | 0 | 6,058 | 1.1% | 27 Feb, 2026 |
| 18 | James Meyer | Sr. Vice President Cfo | 5,830 | 0 | 5,830 | 1.0% | 24 Aug, 2026 |
| 19 | Dion J Weisler | Director | 5,446 | 0 | 5,446 | 1.0% | 22 May, 2026 |
| 20 | Ruby R Chandy | Director | 3,463 | 0 | 3,463 | 0.6% | 22 May, 2026 |
| 21 | James C Mullen | Director | 3,393 | 0 | 3,393 | 0.6% | 22 May, 2025 |
| 22 | Joseph R. Holmes | Vp Chief Accounting Officer | 2,966 | 0 | 2,966 | 0.5% | 10 Aug, 2026 |
| 23 | Debora L Spar | Director | 2,610 | 0 | 2,610 | 0.5% | 22 May, 2026 |
| 24 | R. Alexandra Keith | Director | 2,602 | 0 | 2,602 | 0.5% | 22 May, 2026 |
| 25 | Jennifer M Johnson | Director | 1,403 | 0 | 1,403 | 0.2% | 22 May, 2026 |
| 26 | Karen S Lynch | Director | 1,159 | 0 | 1,159 | 0.2% | 22 May, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Acquired M | 275 | $309.63 | $85.15K | 124,200 | Direct |
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 101 | $625.41 | $63.17K | 124,099 | Direct |
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 33 | $626.59 | $20.68K | 124,066 | Direct |
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 79 | $628.01 | $49.61K | 123,987 | Direct |
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 62 | $628.74 | $38.98K | 123,925 | Direct |
| 24 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed M | 275 | $0.00 | $0 | 0 | Direct |
| 22 Aug, 2026 | James Meyer | Sr. Vice President Cfo | Disposed F | 31 | $629.27 | $19.47K | 5,830 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Acquired M | 10,000 | $309.63 | $3.10Mn | 133,925 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 909 | $625.45 | $568.53K | 133,016 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 821 | $626.83 | $514.63K | 132,195 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 1,314 | $627.66 | $824.75K | 130,881 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 2,601 | $628.82 | $1.64Mn | 128,280 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 1,250 | $629.85 | $787.31K | 127,030 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 1,035 | $630.87 | $652.95K | 125,995 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 1,430 | $632.01 | $903.77K | 124,565 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 560 | $632.94 | $354.45K | 124,005 | Direct |
| 20 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 80 | $633.99 | $50.72K | 123,925 | Direct |
| 21 Aug, 2026 | Marc N Casper | Chairman Ceo | Acquired M | 10,000 | $309.63 | $3.10Mn | 133,925 | Direct |
| 21 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 2,727 | $625.46 | $1.71Mn | 131,198 | Direct |
| 21 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed S | 3,014 | $626.51 | $1.89Mn | 128,184 | Direct |