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
Q2 2019Eagle Capital ManagementBuy11729,287$8,601
Q1 2019Viking Global InvestorsBuy598,1311,146,037$313,693
Q1 2019Ariel Appreciation FundSell-23,290160,205$43,851
Q1 2019Sound Shore ManagementSell-5,938514,728$140,891
Q1 2019Eagle Capital ManagementSell-4,06229,170$7,984
Q1 2019Cantillon Capital ManagementSell-3,1851,021,745$279,672
Q1 2019Meritage GroupBuy2,351720,479$197,210
Q1 2019Matrix Advisors Value FundSell-2,02347,957$13,127
Q1 2019Dodge & Cox Stock FundSell-1,10038,248$10,469
Q1 2019Olstein Capital ManagementSell-50012,000$3,285
Q1 2019Sequoia Financial AdvisorsSell-4051,770$484
Q4 2018Eagle Capital ManagementSell-3,246,71233,232$7,437
Q4 2018Viking Global InvestorsSell-1,329,914547,906$122,616
Q4 2018Cantillon Capital ManagementBuy489,0811,024,930$229,369
Q4 2018Meritage GroupSell-166,868718,128$160,710
Q4 2018Sound Shore ManagementSell-154,044520,666$116,520
Q4 2018Ariel Appreciation FundSell-132,402183,495$41,064
Q4 2018Olstein Capital ManagementSell-9,50012,500$2,797
Q4 2018Matrix Advisors Value FundSell-2,94949,980$11,185
Q4 2018Dodge & Cox Stock FundSell-75039,348$8,806
Q3 2018Viking Global InvestorsSell-602,5421,877,820$458,338
Q3 2018Cantillon Capital ManagementBuy535,849535,849$130,790
Q3 2018Appaloosa ManagementSell-398,000187,000$45,643
Q3 2018Eagle Capital ManagementSell-84,1843,279,944$800,569
Q3 2018Meritage GroupSell-78,433884,996$216,010
Q3 2018Sound Shore ManagementSell-28,378674,710$164,683
Q3 2018Ariel Appreciation FundSell-19,081315,897$77,104
Q3 2018Matrix Advisors Value FundSell-7,50252,929$12,919
Q3 2018Dodge & Cox Stock FundSell-1,00040,098$9,787
Q3 2018Olstein Capital ManagementSell-1,00022,000$5,370

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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