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
Q1 2026Viking Global InvestorsBuy874,8381,668,025$819,884,328
Q1 2026Renaissance Technologies LLCSell-319,986138,964$68,304,975
Q1 2026Cantillon Capital ManagementSell-103,624769,698$378,329,658
Q1 2026Parnassus Endeavor FundSell-78,4541,504,651$739,581,107
Q1 2026Lindsell TrainSell-72,292617,211$303,377,723
Q1 2026Matrix Advisors Value FundBuy1,20622,547$11,082,684
Q1 2026Sequoia Financial AdvisorsBuy46615,810$7,771,044
Q1 2026Olstein Capital ManagementBuy3506,750$3,318
Q1 2026Hillman Value FundBuy22656$322,444
Q4 2025Viking Global InvestorsBuy664,698793,187$459,612,207
Q4 2025Parnassus Endeavor FundSell-510,5161,583,105$917,330,192
Q4 2025Third PointSell-300,00050,000$28,972,500
Q4 2025Lindsell TrainSell-128,026689,503$399,532,513
Q4 2025Polen Capital ManagementSell-112,2062,307$1,336,900
Q4 2025Cantillon Capital ManagementBuy6,552873,322$506,046,433
Q4 2025Olstein Capital ManagementSell-1,6006,400$3,708
Q4 2025Sequoia Financial AdvisorsBuy46615,344$8,891,299
Q4 2025Mairs & Power Growth FundSell-3751,241$719,097
Q4 2025Hillman Value FundSell-186634$367,371
Q4 2025Matrix Advisors Value FundSell-17021,341$12,366,227
Q3 2025Polen Capital ManagementSell-2,075,835114,513$55,541,018
Q3 2025Parnassus Endeavor FundSell-71,6372,093,621$1,015,448,058
Q3 2025Lindsell TrainSell-37,083817,529$396,517,916
Q3 2025Cantillon Capital ManagementSell-9,495866,770$420,400,785
Q3 2025Hillman Value FundBuy820820$397,716
Q3 2025Sequoia Financial AdvisorsBuy24714,878$7,215,946
Q3 2025Dodge & Cox Stock FundSell-20025,741$12,484,900
Q3 2025Matrix Advisors Value FundBuy13421,511$10,433,096
Q2 2025Parnassus Endeavor FundBuy744,8272,165,258$877,925,508
Q2 2025Lindsell TrainBuy345,822854,612$346,510,982

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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