Ticker · CUSIP 883556102

TMO

THERMO FISHER SCIENTIFIC INC
Healthcare·Diagnostics & Research
···Share
Holders (tracked)
36
Combined shares
27,035,834
Combined value
$11.21B
Last close
$516.00
Quarter
2025Q4
Tracked holders · last 8 quarters
+11 vs previous quarter over the last 8.
36282024Q12025Q4
Price is +24.5% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

30 events
  1. Daniel Loeb (Third Point) opened position2026-02-17
    +50,000 shares · 2025Q4
    13F
  2. T. Rowe Price added2026-02-17
    +1,230,872 shares · 2025Q4
    13F
  3. Wellington Management added2026-02-17
    +768,780 shares · 2025Q4
    13F
  4. Longview Partners (Guernsey) trimmed2026-02-17
    −53,290 shares · 2025Q4
    13F
  5. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +8,610 shares · 2025Q4
    13F
  6. Larry Robbins (Glenview Capital) trimmed2026-02-17
    −58,994 shares · 2025Q4
    13F
  7. Ron Baron (Baron Capital / BAMCO) added2026-02-17
    +4,108 shares · 2025Q4
    13F
  8. Jeremy Grantham (GMO) added2026-02-17
    +270,200 shares · 2025Q4
    13F
  9. AQR Capital Management trimmed2026-02-17
    −10,856 shares · 2025Q4
    13F
  10. Ken Griffin (Citadel Advisors) added2026-02-17
    +340,704 shares · 2025Q4
    13F
  11. D.E. Shaw & Co. trimmed2026-02-17
    −16,913 shares · 2025Q4
    13F
  12. Andreas Halvorsen (Viking Global) opened position2026-02-17
    +793,187 shares · 2025Q4
    13F
  13. Two Sigma Investments trimmed2026-02-17
    −228 shares · 2025Q4
    13F
  14. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −444,827 shares · 2025Q4
    13F
  15. Steve Cohen (Point72) added2026-02-17
    +267,407 shares · 2025Q4
    13F
  16. Ray Dalio (Bridgewater Associates) opened position2026-02-13
    +1,686 shares · 2025Q4
    13F
  17. Wally Weitz (Weitz Investment) trimmed2026-02-12
    −15,500 shares · 2025Q4
    13F
  18. Norges Bank (Norway SWF) opened position2026-02-10
    +5,302,863 shares · 2025Q4
    13F
  19. Ken Fisher (Fisher Asset Mgmt) added2026-02-09
    +71,320 shares · 2025Q4
    13F
  20. Tom Gayner (Markel Group) added2026-02-06
    +7,000 shares · 2025Q4
    13F
  21. Mario Gabelli (GAMCO) trimmed2026-02-05
    −490 shares · 2025Q4
    13F
  22. Baillie Gifford & Co added2026-01-23
    +279,635 shares · 2025Q4
    13F
  23. Paul Tudor Jones (Tudor Investment) exited2025-12-09
    −85,253 shares · 2025Q3
    13F
  24. Izzy Englander (Millennium Mgmt) added2025-11-14
    +186,092 shares · 2025Q3
    13F
  25. Steve Cohen (Point72) trimmed2025-11-14
    −201,889 shares · 2025Q3
    13F
  26. Two Sigma Investments trimmed2025-11-14
    −627,589 shares · 2025Q3
    13F
  27. D.E. Shaw & Co. trimmed2025-11-14
    −1,261,516 shares · 2025Q3
    13F
  28. T. Rowe Price added2025-11-14
    +911,822 shares · 2025Q3
    13F
  29. Wellington Management added2025-11-14
    +1,270,191 shares · 2025Q3
    13F
  30. Stanley Druckenmiller (Duquesne) exited2025-11-14
    −12,200 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.
View full insider history for TMO →
Follow-the-investor returns
If you'd copied each holder of TMO…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2016Q1$143.38+259.9%$3.97B
Dodge & Cox2016Q1$146.13+253.1%$13.3M
Longview Partners (Guernsey)2016Q1$165.07+212.6%$438.7M
Ray Dalio (Bridgewater Associates)2016Q2$257.59+100.3%$870K
Mario Gabelli (GAMCO)2016Q1$292.27+76.5%$2.4M
Wally Weitz (Weitz Investment)2016Q4$340.43+51.6%$69.6M
Baillie Gifford & Co2017Q4$340.79+51.4%$397.8M
Larry Robbins (Glenview Capital)2016Q1$383.32+34.6%$115.6M
Wellington Management2016Q1$390.44+32.2%$1.79B
Ken Fisher (Fisher Asset Mgmt)2016Q1$413.81+24.7%$1.44B
Paul Tudor Jones (Tudor Investment)2016Q2$433.33+19.1%$3.4M
Paul Tudor Jones (Tudor Investment)2016Q2$433.33+19.1%$3.4M
Paul Tudor Jones (Tudor Investment)2016Q2$433.33+19.1%$3.4M
Bill Nygren (Harris / Oakmark)2025Q3$485.02+6.4%$279K
AQR Capital Management2016Q1$498.65+3.5%$74.7M
Ken Griffin (Citadel Advisors)2016Q2$506.75+1.8%$148.3M
Ken Griffin (Citadel Advisors)2016Q2$506.75+1.8%$148.3M
Ken Griffin (Citadel Advisors)2016Q2$506.75+1.8%$148.3M
Jeremy Grantham (GMO)2017Q1$506.95+1.8%$1.24B
Daniel Loeb (Third Point)2024Q4$520.23-0.8%$25.8M
Tom Gayner (Markel Group)2022Q2$522.02-1.2%$32.4M
Ron Baron (Baron Capital / BAMCO)2019Q3$534.59-3.5%$14.9M
Izzy Englander (Millennium Mgmt)2016Q1$536.54-3.8%$62.7M
Izzy Englander (Millennium Mgmt)2016Q1$536.54-3.8%$62.7M
Izzy Englander (Millennium Mgmt)2016Q1$536.54-3.8%$62.7M
D.E. Shaw & Co.2016Q1$565.54-8.8%$568K
D.E. Shaw & Co.2016Q1$565.54-8.8%$568K
D.E. Shaw & Co.2016Q1$565.54-8.8%$568K
Two Sigma Investments2016Q2$565.75-8.8%$1.0M
Two Sigma Investments2016Q2$565.75-8.8%$1.0M
Two Sigma Investments2016Q2$565.75-8.8%$1.0M
Andreas Halvorsen (Viking Global)2017Q4$573.51-10.0%$409.3M
Steve Cohen (Point72)2016Q4$577.20-10.6%$225.4M
Steve Cohen (Point72)2016Q4$577.20-10.6%$225.4M
Steve Cohen (Point72)2016Q4$577.20-10.6%$225.4M
Norges Bank (Norway SWF)2016Q1$92883.21-99.4%$2.74B

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions5
Added to9
Trimmed8
Exited0
—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
27
$3.05T
2022Q2
28
$2.97T
2022Q3
27
$2.85B
2022Q4
29
$24.12B
2023Q1
27
$27.32B
2023Q2
33
$25.87B
2023Q3
31
$22.47B
2023Q4
28
$23.68B
2024Q1
28
$26.43B
2024Q2
30
$25.93B
2024Q3
29
$9.52B
2024Q4
31
$7.73B
2025Q1
28
$4.67B
2025Q2
31
$7.58B
2025Q3
25
$5.59B
2025Q4
36
$11.21B
Congress members trading this stock
DateMemberTypeAmount rangeFiling
2025-10-31Lisa McClainSell$1K – $15KPDF ↗
2025-10-30Lisa McClainBuy$1K – $15KPDF ↗
2025-10-30Lisa McClainSell$1K – $15KPDF ↗
2025-09-23Valerie HoyleSell$1K – $15KPDF ↗
2025-08-19Kelly Louise MorrisonSell (P)$1K – $15KPDF ↗
2025-08-19Kelly Louise MorrisonSell (P)$1K – $15KPDF ↗
2025-07-25Julia LetlowBuy$1K – $15KPDF ↗
2025-07-22Lisa McClainBuy$1K – $15KPDF ↗
2025-06-10Lisa McClainSell (P)$1K – $15KPDF ↗
2025-06-06Valerie HoyleBuy$1K – $15KPDF ↗
2025-05-05Thomas H. KeanBuy$1K – $15KPDF ↗
2025-04-28Julia LetlowSell$1K – $15KPDF ↗

Who owns TMO

36 super-investors · 2025Q4
Tracked stake
27.04M
shares
Combined value
$11.21B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New7Added13Trim14Held2
#ManagerSharesValue
1Norges Bank
Norway SWF
5.30M$3.07B
2Wellington Management3.47M$2.01B
3Ken Fisher
Fisher Asset Mgmt
2.79M$1.62B
4Jeremy Grantham
GMO
2.41M$1.40B
5Longview Partners
Guernsey
850.3K$493M
6Andreas Halvorsen
Viking Global
793.2K$460M
7Baillie Gifford & Co770.9K$447M
8Ken Griffin
Citadel Advisors
690.4K$400M
9Steve Cohen
Point72
436.9K$253M
10Ken Griffin
Citadel Advisors
351.7K$204M
11Ken Griffin
Citadel Advisors
287.4K$167M
12Larry Robbins
Glenview Capital
223.9K$130M
13AQR Capital Management144.8K$84M
14Steve Cohen
Point72
137.9K$80M
15Wally Weitz
Weitz Investment
134.9K$78M
16Izzy Englander
Millennium Mgmt
121.5K$70M
17Izzy Englander
Millennium Mgmt
80.6K$47M
18Tom Gayner
Markel Group
62.8K$36M
19Izzy Englander
Millennium Mgmt
52.3K$30M
20Daniel Loeb
Third Point
50.0K$29M
21D.E. Shaw & Co.47.5K$28M
22Ron Baron
Baron Capital / BAMCO
28.8K$17M
23Dodge & Cox25.7K$15M
24Steve Cohen
Point72
16.0K$9M
25Two Sigma Investments9.3K$5M
26Paul Tudor Jones
Tudor Investment
9.0K$5M
27Paul Tudor Jones
Tudor Investment
8.6K$5M
28T. Rowe Price7.70M$4M
29D.E. Shaw & Co.6.6K$4M
30Paul Tudor Jones
Tudor Investment
6.6K$4M
31Mario Gabelli
GAMCO
4.6K$3M
32Two Sigma Investments2.0K$1M
33Ray Dalio
Bridgewater Associates
1.7K$977K
34Two Sigma Investments1.3K$753K
35D.E. Shaw & Co.1.1K$637K
36Bill Nygren
Harris / Oakmark
541$313K

Recent moves

20 transactions
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