THERMO FISHER SCIENTIFIC INC (TMO) Institutional Ownership Changes & 13F Activity

THERMO FISHER SCIENTIFIC INC (TMO) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Viking Global Investors, Renaissance Technologies LLC, Cantillon Capital Management, Parnassus Endeavor Fund, and Lindsell Train.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2022Parnassus Endeavor FundBuy162,8251,125,075$570,627
Q3 2022Lone Pine CapitalSell-46,966885,326$449,028
Q3 2022Cantillon Capital ManagementSell-6,767851,439$431,842
Q3 2022Dodge & Cox Stock FundSell-57531,029$15,738
Q3 2022Sequoia Financial AdvisorsBuy30018,073$9,166
Q3 2022Matrix Advisors Value FundSell-12922,350$11,336
Q2 2022Lone Pine CapitalBuy411,583932,292$506,496
Q2 2022Viking Global InvestorsBuy377,891862,587$468,626
Q2 2022Parnassus Endeavor FundBuy26,081962,250$522,771
Q2 2022Sequoia Financial AdvisorsBuy14,51917,773$9,656
Q2 2022AKO CapitalBuy5,9621,212,500$658,727
Q2 2022Cantillon Capital ManagementSell-4,695858,206$466,246
Q2 2022ARK InvestSell-496290$165
Q2 2022Matrix Advisors Value FundSell-1722,479$12,212
Q1 2022Lone Pine CapitalSell-2,245,767520,709$307,557
Q1 2022Parnassus Endeavor FundBuy936,169936,169$552,948
Q1 2022Viking Global InvestorsBuy273,638484,696$286,286
Q1 2022Renaissance Technologies LLCSell-29,44431,900$18,842
Q1 2022Cantillon Capital ManagementBuy24,611862,901$509,673
Q1 2022AKO CapitalSell-23,3611,206,538$712,642
Q1 2022Sequoia Financial AdvisorsBuy8673,254$1,922
Q1 2022Matrix Advisors Value FundBuy63422,496$13,287
Q1 2022ARK InvestSell-352786$464
Q4 2021AKO CapitalBuy87,4381,229,899$820,638
Q4 2021Cantillon Capital ManagementSell-62,921838,290$559,340
Q4 2021Viking Global InvestorsBuy28,821211,058$140,826
Q4 2021Sequoia Financial AdvisorsBuy1,7032,387$1,593
Q4 2021Dodge & Cox Stock FundSell-32731,604$21,087
Q4 2021Matrix Advisors Value FundSell-20221,862$14,587
Q4 2021ARK InvestBuy1391,138$759

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.

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