QUEST DIAGNOSTICS INC (DGX) Institutional Ownership Changes & 13F Activity

QUEST DIAGNOSTICS INC (DGX) 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 Olstein Capital Management, First Eagle U.S. Value, Sequoia Financial Advisors, Causeway Capital Management, and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q2 2021Renaissance Technologies LLCSell-80,400188,300$24,850
Q2 2021Causeway Capital ManagementSell-14,070305,502$40,317
Q1 2021Renaissance Technologies LLCSell-354,100268,700$34,485
Q1 2021Causeway Capital ManagementBuy319,572319,572$41,014
Q1 2021Olstein Capital ManagementBuy22,00062,000$7,957
Q4 2020Renaissance Technologies LLCBuy562,100622,800$74,219
Q4 2020Olstein Capital ManagementSell-19,00040,000$4,767
Q3 2020Renaissance Technologies LLCSell-97,00060,700$6,950
Q2 2020Lountzis Asset ManagementBuy450450$51
Q1 2020Ariel Appreciation FundBuy190,909592,375$47,568
Q1 2020Renaissance Technologies LLCBuy26,400157,700$12,663
Q4 2019Renaissance Technologies LLCBuy35,000131,300$14,022
Q4 2019Ariel Appreciation FundSell-9,602401,466$42,873
Q3 2019Renaissance Technologies LLCBuy70,58096,300$10,307
Q3 2019Ariel Appreciation FundBuy11,054411,068$43,997
Q2 2019Ariel Appreciation FundBuy6,263400,014$40,725
Q1 2019Ariel Appreciation FundBuy39,709393,751$35,406
Q1 2019Renaissance Technologies LLCSell-23,10025,720$2,313
Q4 2018Renaissance Technologies LLCSell-210,58048,820$4,065
Q4 2018Ariel Appreciation FundBuy93,781354,042$29,481
Q3 2018Renaissance Technologies LLCSell-80,400259,400$27,992
Q3 2018Ariel Appreciation FundBuy16,662260,261$28,085
Q2 2018Ariel Appreciation FundBuy3,157243,599$26,781
Q1 2018Renaissance Technologies LLCSell-525,400339,800$34,082
Q1 2018Ariel Appreciation FundSell-7,690240,442$24,116
Q4 2017Renaissance Technologies LLCBuy146,100865,200$85,214
Q4 2017Ariel Appreciation FundBuy114,292248,132$24,439
Q3 2017Renaissance Technologies LLCBuy283,800719,100$67,337
Q3 2017Ariel Appreciation FundSell-30,317133,840$12,533
Q2 2017Renaissance Technologies LLCSell-68,400435,300$48,388

Frequently asked questions about DGX activity

  • Which institutional owners are buying DGX?

    Institutional owners buying DGX 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 DGX activity?

    "Buy" means an investor increased their reported position in DGX compared to the prior reporting period. This reflects growing exposure to QUEST DIAGNOSTICS INC (DGX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in DGX increasing?

    Institutional interest in DGX 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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