THERMO FISHER SCIENTIFIC INC (TMO) Stock Institutional Trading Activity
THERMO FISHER SCIENTIFIC INC (TMO) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Viking Global Investors, Third Point, Lindsell Train, Polen Capital Management, and Cantillon Capital Management. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- THERMO FISHER SCIENTIFIC INC (TMO) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2018 | Eagle Capital Management | Sell | -3,246,712 | 33,232 | $7,437 |
| Q4 2018 | Dodge & Cox Stock Fund | Sell | -750 | 39,348 | $8,806 |
| Q4 2018 | Ariel Appreciation Fund | Sell | -132,402 | 183,495 | $41,064 |
| Q4 2018 | Olstein Capital Management | Sell | -9,500 | 12,500 | $2,797 |
| Q4 2018 | Matrix Advisors Value Fund | Sell | -2,949 | 49,980 | $11,185 |
| Q4 2018 | Viking Global Investors | Sell | -1,329,914 | 547,906 | $122,616 |
| Q4 2018 | Meritage Group | Sell | -166,868 | 718,128 | $160,710 |
| Q4 2018 | Cantillon Capital Management | Buy | 489,081 | 1,024,930 | $229,369 |
| Q3 2018 | Sound Shore Management | Sell | -28,378 | 674,710 | $164,683 |
| Q3 2018 | Dodge & Cox Stock Fund | Sell | -1,000 | 40,098 | $9,787 |
| Q3 2018 | Eagle Capital Management | Sell | -84,184 | 3,279,944 | $800,569 |
| Q3 2018 | Ariel Appreciation Fund | Sell | -19,081 | 315,897 | $77,104 |
| Q3 2018 | Olstein Capital Management | Sell | -1,000 | 22,000 | $5,370 |
| Q3 2018 | Matrix Advisors Value Fund | Sell | -7,502 | 52,929 | $12,919 |
| Q3 2018 | Appaloosa Management | Sell | -398,000 | 187,000 | $45,643 |
| Q3 2018 | Cantillon Capital Management | Buy | 535,849 | 535,849 | $130,790 |
| Q3 2018 | Meritage Group | Sell | -78,433 | 884,996 | $216,010 |
| Q3 2018 | Viking Global Investors | Sell | -602,542 | 1,877,820 | $458,338 |
| Q2 2018 | Mairs & Power Growth Fund | Buy | 600 | 2,060 | $427 |
| Q2 2018 | Sound Shore Management | Sell | -42,464 | 703,088 | $145,638 |
| Q2 2018 | Dodge & Cox Stock Fund | Sell | -680 | 41,098 | $8,513 |
| Q2 2018 | Eagle Capital Management | Sell | -74,201 | 3,364,128 | $696,846 |
| Q2 2018 | Ariel Appreciation Fund | Sell | -5,392 | 334,978 | $69,387 |
| Q2 2018 | Matrix Advisors Value Fund | Sell | -2,159 | 60,431 | $12,518 |
| Q2 2018 | Appaloosa Management | Sell | -12,000 | 585,000 | $121,177 |
| Q2 2018 | Meritage Group | Sell | -95,556 | 963,429 | $199,565 |
| Q2 2018 | Viking Global Investors | Buy | 1,615,681 | 2,480,362 | $513,782 |
| Q1 2018 | Sound Shore Management | Sell | -231,407 | 745,552 | $153,927 |
| Q1 2018 | Dodge & Cox Stock Fund | Sell | -2,159 | 41,778 | $8,625 |
| Q1 2018 | Eagle Capital Management | Sell | -97,159 | 3,438,329 | $709,877 |
Frequently asked questions about TMO activity
Which institutional owners are buying TMO?
Institutional owners buying TMO include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in TMO activity?
"Buy" means an investor increased their reported position in TMO compared to the prior reporting period. This reflects growing exposure to THERMO FISHER SCIENTIFIC INC (TMO) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in TMO increasing?
Institutional interest in TMO can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.