TMO
Thermo Fisher Scientific Inc
NYSE: TMO · HEALTHCARE · DIAGNOSTICS & RESEARCH
$469.34
-1.33% today
Updated 2026-06-12
Market cap
$179.15B
P/E ratio
26.53
P/S ratio
3.96x
EPS (TTM)
$18.17
Dividend yield
0.36%
52W range
$384 – $643
Volume
2.3M
Thermo Fisher Scientific Inc (TMO) Insider transactions
Net insider activity
Net buying (86,712 shares)
Buy transactions
43
Sell transactions
57
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-05-20 | WEISLER, DION J | Director | Buy | 499 | — | — |
| 2026-05-20 | WEISLER, DION J | Director | Sale | 80 | $451.79 | $36143.20 |
| 2026-05-20 | SPERLING, SCOTT M | Director | Buy | 499 | — | — |
| 2026-05-20 | SPAR, DEBORA L | Director | Buy | 499 | — | — |
| 2026-05-20 | LYNCH, KAREN S | Director | Buy | 499 | — | — |
| 2026-05-20 | KEITH, R. ALEXANDRA | Director | Buy | 499 | — | — |
| 2026-05-20 | JOHNSON, JENNIFER M | Director | Buy | 499 | — | — |
| 2026-05-20 | JACKS, TYLER | Director | Buy | 499 | — | — |
| 2026-05-20 | HARRIS, C MARTIN | Director | Buy | 499 | — | — |
| 2026-05-20 | CHANDY, RUBY R | Director | Buy | 499 | — | — |
| 2026-05-20 | CHAI, NELSON | Director | Buy | 499 | — | — |
| 2026-04-27 | PETTITI, GIANLUCA | President & COO | Sale | 400 | $462.66 | $185064.00 |
| 2026-03-28 | WEISLER, DION J | Director | Buy | 79 | — | — |
| 2026-03-28 | SPERLING, SCOTT M | Director | Buy | 90 | — | — |
| 2026-03-28 | LYNCH, KAREN S | Director | Buy | 66 | — | — |
| 2026-03-28 | KEITH, R. ALEXANDRA | Director | Buy | 66 | — | — |
| 2026-03-28 | JOHNSON, JENNIFER M | Director | Buy | 66 | — | — |
| 2026-03-11 | SHAFER, MICHAEL D | Executive Vice President | Sale | 1,607 | $499.40 | $802535.80 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 4,000 | — | — |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Buy | 4,000 | $309.63 | $1.24M |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 1,133 | $513.71 | $582033.43 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 570 | $514.71 | $293384.70 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 516 | $519.13 | $267871.08 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 411 | $512.73 | $210732.03 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 348 | $515.64 | $179442.72 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 264 | $519.74 | $137211.36 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 214 | $511.78 | $109520.92 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 201 | $516.73 | $103862.73 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 106 | $517.83 | $54889.98 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 99 | $509.66 | $50456.34 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 60 | $505.76 | $30345.60 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 58 | $507.54 | $29437.32 |
| 2026-03-05 | CASPER, MARC N | Director, Chairman & CEO | Sale | 20 | $503.66 | $10073.20 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 5,000 | — | — |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Buy | 5,000 | $309.63 | $1.55M |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 1,370 | $511.80 | $701166.00 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 1,241 | $512.92 | $636533.72 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 815 | $513.63 | $418608.45 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 678 | $510.71 | $346261.38 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 447 | $509.89 | $227920.83 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 212 | $514.86 | $109150.32 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 119 | $515.77 | $61376.63 |
| 2026-03-04 | CASPER, MARC N | Director, Chairman & CEO | Sale | 118 | $516.75 | $60976.50 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 5,000 | — | — |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Buy | 5,000 | $309.63 | $1.55M |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 931 | $507.90 | $472854.90 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 759 | $508.95 | $386293.05 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 680 | $498.14 | $338735.20 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 480 | $496.84 | $238483.20 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 448 | $506.74 | $227019.52 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 382 | $500.55 | $191210.10 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 360 | $495.29 | $178304.40 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 240 | $499.75 | $119940.00 |
| 2026-03-03 | CASPER, MARC N | Director, Chairman & CEO | Sale | 120 | $509.62 | $61154.40 |
| 2026-02-28 | WILLIAMSON, STEPHEN | Retiring Sr. VP and CFO | Sale | 675 | $521.11 | $351749.25 |
| 2026-02-28 | WILLIAMSON, STEPHEN | Retiring Sr. VP and CFO | Sale | 247 | $521.11 | $128714.17 |
| 2026-02-28 | SHAFER, MICHAEL D | Executive Vice President | Sale | 466 | $521.11 | $242837.26 |
| 2026-02-28 | SHAFER, MICHAEL D | Executive Vice President | Sale | 252 | $521.11 | $131319.72 |
| 2026-02-28 | SHAFER, MICHAEL D | Executive Vice President | Sale | 98 | $521.11 | $51068.78 |
| 2026-02-28 | PETTITI, GIANLUCA | President & COO | Sale | 742 | $521.11 | $386663.62 |
| 2026-02-28 | PETTITI, GIANLUCA | President & COO | Sale | 332 | $521.11 | $173008.52 |
| 2026-02-28 | LOWERY, FREDERICK M. | Executive Vice President | Sale | 522 | $521.11 | $272019.42 |
| 2026-02-28 | LOWERY, FREDERICK M. | Executive Vice President | Sale | 264 | $521.11 | $137573.04 |
| 2026-02-28 | LOWERY, FREDERICK M. | Executive Vice President | Sale | 111 | $521.11 | $57843.21 |
| 2026-02-28 | LAGARDE, MICHEL | Executive Vice President | Sale | 837 | $521.11 | $436169.07 |
| 2026-02-28 | LAGARDE, MICHEL | Executive Vice President | Sale | 360 | $521.11 | $187599.60 |
| 2026-02-28 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Sale | 55 | $521.11 | $28661.05 |
| 2026-02-28 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Sale | 44 | $521.11 | $22928.84 |
| 2026-02-28 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Sale | 12 | $521.11 | $6253.32 |
| 2026-02-28 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Sale | 4 | $521.11 | $2084.44 |
| 2026-02-28 | CASPER, MARC N | Director, Chairman & CEO | Sale | 3,474 | $521.11 | $1.81M |
| 2026-02-28 | CASPER, MARC N | Director, Chairman & CEO | Sale | 1,211 | $521.11 | $631064.21 |
| 2026-02-28 | BRITT, LISA P. | Sr. VP and Chief HR Officer | Sale | 263 | $521.11 | $137051.93 |
| 2026-02-28 | BRITT, LISA P. | Sr. VP and Chief HR Officer | Sale | 85 | $521.11 | $44294.35 |
| 2026-02-25 | WILLIAMSON, STEPHEN | Sr. VP and CFO | Buy | 1,534 | — | — |
| 2026-02-25 | SHROPSHIRE, THOMAS B JR. | SVP and General Counsel | Buy | 4,281 | — | — |
| 2026-02-25 | SHROPSHIRE, THOMAS B JR. | SVP and General Counsel | Buy | 978 | — | — |
| 2026-02-25 | SHAFER, MICHAEL D | Executive Vice President | Buy | 13,698 | — | — |
| 2026-02-25 | SHAFER, MICHAEL D | Executive Vice President | Buy | 3,129 | — | — |
| 2026-02-25 | SHAFER, MICHAEL D | Executive Vice President | Buy | 1,569 | — | — |
| 2026-02-25 | PETTITI, GIANLUCA | Executive Vice President | Buy | 16,270 | — | — |
| 2026-02-25 | PETTITI, GIANLUCA | Executive Vice President | Buy | 3,715 | — | — |
| 2026-02-25 | PETTITI, GIANLUCA | Executive Vice President | Buy | 2,057 | — | — |
| 2026-02-25 | LOWERY, FREDERICK M. | Executive Vice President | Buy | 1,638 | — | — |
| 2026-02-25 | LAGARDE, MICHEL | Executive Vice President & COO | Buy | 2,231 | — | — |
| 2026-02-25 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Buy | 985 | — | — |
| 2026-02-25 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Buy | 433 | — | — |
| 2026-02-25 | HOLMES, JOSEPH R. | VP & Chief Accounting Officer | Buy | 337 | — | — |
| 2026-02-25 | CASPER, MARC N | Director, Chairman & CEO | Buy | 32,109 | — | — |
| 2026-02-25 | CASPER, MARC N | Director, Chairman & CEO | Buy | 7,515 | — | — |
| 2026-02-25 | CASPER, MARC N | Director, Chairman & CEO | Buy | 7,333 | — | — |
| 2026-02-25 | BRITT, LISA P. | Sr. VP and Chief HR Officer | Buy | 5,139 | — | — |
| 2026-02-25 | BRITT, LISA P. | Sr. VP and Chief HR Officer | Buy | 1,173 | — | — |
| 2026-02-25 | BRITT, LISA P. | Sr. VP and Chief HR Officer | Buy | 872 | — | — |
| 2026-02-09 | PETTITI, GIANLUCA | Executive Vice President | Sale | 400 | $541.20 | $216480.00 |
| 2025-12-31 | WEISLER, DION J | Director | Buy | 65 | — | — |
| 2025-12-31 | SPERLING, SCOTT M | Director | Buy | 73 | — | — |
| 2025-12-31 | LYNCH, KAREN S | Director | Buy | 54 | — | — |
| 2025-12-31 | KEITH, R. ALEXANDRA | Director | Buy | 54 | — | — |
| 2025-12-31 | JOHNSON, JENNIFER M | Director | Buy | 54 | — | — |
Frequently asked questions
Are TMO insiders buying or selling?
Over the transactions on record, TMO insiders have been net sellers, with about $13.31M in stock sold across 57 sales, against 3 open-market purchases.
Does insider selling at TMO mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which TMO insiders are selling the most?
Recent selling is concentrated in a few names. CASPER, MARC N accounts for the largest share on record, with about $9.28M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.