Tom Gayner's TMO Position Overview
Tom Gayner (via Markel Group Inc.) currently holds 62,800 shares of Thermo Fisher Scientific Inc. (TMO) worth $36.39 M, representing 0.29% of the portfolio. First purchased in 2021-Q4, this medium-term investment has been held for 17 quarters.
Based on 13F filings, Tom Gayner has maintained a strategic position in TMO, demonstrating sustained confidence in this investment. Largest addition occurred in Q4 2025, adding 7,000 shares.
Analysis based on 13F filings available since 2013 Q2
Tom Gayner's Thermo Fisher Scientific (TMO) Holding Value Over Time
Track share changes against reported price movement
Quarterly Thermo Fisher Scientific (TMO) Trades by Tom Gayner
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | +7,000 | Add 12.54% | 62,800 | $579.45 |
| Q3 2025 | +6,250 | Add 12.61% | 55,800 | $485.02 |
| Q2 2025 | +4,550 | Add 10.11% | 49,550 | $405.46 |
| Q1 2025 | +3,900 | Add 9.49% | 45,000 | $497.60 |
| Q4 2024 | +5,700 | Add 16.10% | 41,100 | $520.23 |
| Q3 2024 | +6,000 | Add 20.41% | 35,400 | $618.57 |
| Q2 2024 | +4,700 | Add 19.03% | 29,400 | $553.00 |
| Q1 2024 | +5,100 | Add 26.02% | 24,700 | $581.21 |
| Q4 2023 | +6,000 | Add 44.12% | 19,600 | $530.79 |
| Q3 2023 | +5,400 | Add 65.85% | 13,600 | $506.17 |
| Q4 2022 | +400 | Add 5.13% | 8,200 | $550.69 |
| Q3 2022 | +1,300 | Add 20.00% | 7,800 | $507.18 |
| Q2 2022 | +4,550 | Add 233.33% | 6,500 | $543.23 |
| Q1 2022 | +1,650 | Add 550.00% | 1,950 | $590.77 |
| Q4 2021 | +300 | New Buy | 300 | $666.67 |
Tom Gayner's Thermo Fisher Scientific Investment FAQs
Tom Gayner first purchased Thermo Fisher Scientific Inc. (TMO) in Q4 2021, acquiring 300 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Tom Gayner has held Thermo Fisher Scientific Inc. (TMO) for 17 quarters since Q4 2021.
Tom Gayner's largest addition to Thermo Fisher Scientific Inc. (TMO) was in Q4 2025, adding 62,800 shares worth $36.39 M.
According to the latest 13F filing for Q4 2025, Tom Gayner's firm, Markel Group Inc., owns 62,800 shares of Thermo Fisher Scientific Inc. (TMO), valued at approximately $36.39 M.
As of the Q4 2025 filing, Thermo Fisher Scientific Inc. (TMO) represents approximately 0.29% of Tom Gayner's publicly disclosed stock portfolio, making it one of their key holdings.
Tom Gayner's peak holding in Thermo Fisher Scientific Inc. (TMO) was 62,800 shares, as reported at the end of Q4 2025.