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 2024Eagle Capital ManagementSell-951,107$643,399
Q1 2024Mairs & Power Growth FundSell-901,541$895,645
Q4 2023Viking Global InvestorsSell-361,230538,485$285,822,453
Q4 2023AKO CapitalSell-174,490163,937$87,016
Q4 2023Parnassus Endeavor FundBuy143,3561,386,284$735,825,685
Q4 2023Polen Capital ManagementSell-118,0782,032,950$1,079,159,556
Q4 2023TCI Fund ManagementSell-46,8003,146,382$1,670,068,102
Q4 2023Sequoia Financial AdvisorsBuy38,50344,788$23,772,926
Q4 2023Cantillon Capital ManagementSell-21,746882,017$468,165,803
Q4 2023Matrix Advisors Value FundSell-26721,967$11,659,864
Q4 2023Mairs & Power Growth FundBuy671,631$865,718
Q3 2023Polen Capital ManagementSell-87,6212,151,028$1,088,785,598
Q3 2023Viking Global InvestorsBuy66,482899,715$455,408,742
Q3 2023Parnassus Endeavor FundSell-23,5941,242,928$629,132,866
Q3 2023TCI Fund ManagementBuy20,0003,193,182$1,616,292,933
Q3 2023AKO CapitalSell-7,146338,427$171,302
Q3 2023Bill & Melinda Gates Foundation TrustBuy5,6755,675$2,872,515
Q3 2023Cantillon Capital ManagementSell-3,451903,763$457,457,717
Q3 2023Sequoia Financial AdvisorsBuy4536,285$3,181,199
Q3 2023Muhlenkamp & CoBuy450450$227,777
Q3 2023Dodge & Cox Stock FundSell-25027,173$13,754,157
Q3 2023Mairs & Power Growth FundSell-1781,564$791,650
Q3 2023Matrix Advisors Value FundBuy3922,234$11,254,184
Q2 2023TCI Fund ManagementBuy2,339,0323,173,182$1,655,607,709
Q2 2023Egerton Capital UKBuy455,728562,479$293,473,418
Q2 2023Renaissance Technologies LLCBuy296,646328,546$171,419
Q2 2023AKO CapitalSell-268,711345,573$180,303
Q2 2023Cantillon Capital ManagementBuy87,092907,214$473,338,905
Q2 2023Polen Capital ManagementSell-32,2872,238,649$1,168,015,294
Q2 2023Viking Global InvestorsSell-23,603833,233$434,739,318

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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