As of September 12, 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 | 122,669 | 0 | 122,669 | 22.0% | 01 Sep, 2026 |
| 2 | Michel Lagarde | Executive Vice President | 85,151 | 0 | 85,151 | 15.2% | 02 Mar, 2026 |
| 3 | Scott M Sperling | Director | 69,479 | 0 | 69,479 | 12.4% | 22 May, 2026 |
| 4 | Mark Stevenson | Retiring Executive Vp Coo | 62,141 | 0 | 62,141 | 11.1% | 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 | 23,216 | 0 | 23,216 | 4.2% | 01 Sep, 2026 |
| 7 | Michael D Shafer | Executive Vice President | 20,204 | 0 | 20,204 | 3.6% | 01 Sep, 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 | 14,391 | 0 | 14,391 | 2.6% | 01 Sep, 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 | 1.7% | 23 May, 2024 |
| 17 | Thomas B Jr. Shropshire | Svp And General Counsel | 6,009 | 0 | 6,009 | 1.1% | 01 Sep, 2026 |
| 18 | James Meyer | Sr. Vice President Cfo | 5,560 | 0 | 5,560 | 1.0% | 01 Sep, 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 | 2,916 | 0 | 2,916 | 0.5% | 01 Sep, 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 | 0.3% | 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 |
|---|---|---|---|---|---|---|---|---|
| 28 Aug, 2026 | Michael D Shafer | Executive Vice President | Disposed F | 162 | $622.18 | $101.08K | 20,832 | Direct |
| 28 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed F | 725 | $622.18 | $450.93K | 123,201 | Direct |
| 28 Aug, 2026 | Gianluca Pettiti | President Coo | Disposed F | 212 | $622.18 | $132.06K | 24,439 | Direct |
| 28 Aug, 2026 | Lisa P. Britt | Sr. Vp And Chief Hr Officer | Disposed F | 87 | $622.18 | $54.15K | 14,697 | Direct |
| 28 Aug, 2026 | Joseph R. Holmes | Vp Chief Accounting Officer | Disposed F | 11 | $622.18 | $6.57K | 2,956 | Direct |
| 28 Aug, 2026 | James Meyer | Sr. Vice President Cfo | Disposed F | 37 | $622.18 | $23.16K | 5,793 | Direct |
| 28 Aug, 2026 | Thomas B Jr. Shropshire | Svp And General Counsel | Disposed F | 49 | $622.18 | $30.50K | 6,009 | Direct |
| 28 Aug, 2026 | James Meyer | Sr. Vice President Cfo | Disposed F | 44 | $622.18 | $27.68K | 5,748 | Direct |
| 28 Aug, 2026 | Gianluca Pettiti | President Coo | Disposed F | 304 | $622.18 | $188.92K | 24,135 | Direct |
| 28 Aug, 2026 | Lisa P. Britt | Sr. Vp And Chief Hr Officer | Disposed F | 116 | $622.18 | $72.20K | 14,581 | Direct |
| 28 Aug, 2026 | Michael D Shafer | Executive Vice President | Disposed F | 211 | $622.18 | $131.16K | 20,621 | Direct |
| 28 Aug, 2026 | Marc N Casper | Chairman Ceo | Disposed F | 532 | $622.18 | $330.91K | 122,669 | Direct |
| 28 Aug, 2026 | Joseph R. Holmes | Vp Chief Accounting Officer | Disposed F | 13 | $622.18 | $8.04K | 2,943 | Direct |
| 28 Aug, 2026 | Michael D Shafer | Executive Vice President | Disposed F | 190 | $622.18 | $117.92K | 20,431 | Direct |
| 28 Aug, 2026 | Lisa P. Britt | Sr. Vp And Chief Hr Officer | Disposed F | 105 | $622.18 | $65.58K | 14,476 | Direct |
| 28 Aug, 2026 | James Meyer | Sr. Vice President Cfo | Disposed F | 20 | $622.18 | $12.33K | 5,729 | Direct |
| 28 Aug, 2026 | Joseph R. Holmes | Vp Chief Accounting Officer | Disposed F | 11 | $622.18 | $7.12K | 2,931 | Direct |
| 28 Aug, 2026 | Gianluca Pettiti | President Coo | Disposed F | 249 | $622.18 | $154.92K | 23,886 | Direct |
| 28 Aug, 2026 | Joseph R. Holmes | Vp Chief Accounting Officer | Disposed F | 15 | $622.18 | $9.31K | 2,916 | Direct |
| 28 Aug, 2026 | Lisa P. Britt | Sr. Vp And Chief Hr Officer | Disposed F | 85 | $622.18 | $52.95K | 14,391 | Direct |