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 (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Dodge & Cox Stock Fund, Viking Global Investors, Parnassus Endeavor Fund, Lindsell Train, and Sound Shore Management.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
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
Q2 2023Parnassus Endeavor FundBuy10,1831,266,522$660,807,854
Q2 2023Dodge & Cox Stock FundSell-2,08427,423$14,307,950
Q2 2023Sequoia Financial AdvisorsSell-5205,832$3,042,612
Q2 2023Matrix Advisors Value FundBuy2722,195$11,580,241
Q2 2023Mairs & Power Growth FundBuy31,742$908,889
Q1 2023Egerton Capital UKSell-827,705106,751$61,528,074
Q1 2023TCI Fund ManagementBuy770,380834,150$480,779,036
Q1 2023Parnassus Endeavor FundBuy134,0221,256,339$724,116,109
Q1 2023Polen Capital ManagementBuy77,2252,270,936$1,308,899,532
Q1 2023AKO CapitalSell-33,059614,284$354,055
Q1 2023Viking Global InvestorsBuy17,310856,836$493,854,565
Q1 2023Sequoia Financial AdvisorsSell-16,1356,352$3,660,818
Q1 2023Cantillon Capital ManagementSell-14,827820,122$472,693,717
Q1 2023Mairs & Power Growth FundBuy5351,739$1,002,307
Q1 2023Matrix Private Capital GroupBuy362362$208,768
Q1 2023Dodge & Cox Stock FundBuy30829,507$17,006,950
Q1 2023Matrix Advisors Value FundSell-622,168$12,776,970
Q4 2022Polen Capital ManagementBuy2,193,7112,193,711$1,208,054,689
Q4 2022Lone Pine CapitalSell-297,630587,696$323,638,310
Q4 2022AKO CapitalSell-276,688647,343$356,485
Q4 2022Viking Global InvestorsBuy245,989839,526$462,318,573

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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