QUEST DIAGNOSTICS INC (DGX) Stock Institutional Trading Activity


QUEST DIAGNOSTICS INC (DGX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include First Eagle U.S. Value, Sequoia Financial Advisors, Olstein Capital Management, Causeway Capital Management, and Renaissance Technologies LLC. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2020Olstein Capital ManagementSell-19,00040,000$4,767
Q4 2020Renaissance Technologies LLCBuy562,100622,800$74,219
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 2019Ariel Appreciation FundSell-9,602401,466$42,873
Q4 2019Renaissance Technologies LLCBuy35,000131,300$14,022
Q3 2019Ariel Appreciation FundBuy11,054411,068$43,997
Q3 2019Renaissance Technologies LLCBuy70,58096,300$10,307
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 2018Ariel Appreciation FundBuy93,781354,042$29,481
Q4 2018Renaissance Technologies LLCSell-210,58048,820$4,065
Q3 2018Ariel Appreciation FundBuy16,662260,261$28,085
Q3 2018Renaissance Technologies LLCSell-80,400259,400$27,992
Q2 2018Ariel Appreciation FundBuy3,157243,599$26,781
Q1 2018Ariel Appreciation FundSell-7,690240,442$24,116
Q1 2018Renaissance Technologies LLCSell-525,400339,800$34,082
Q4 2017Ariel Appreciation FundBuy114,292248,132$24,439
Q4 2017Renaissance Technologies LLCBuy146,100865,200$85,214
Q3 2017Ariel Appreciation FundSell-30,317133,840$12,533
Q3 2017Renaissance Technologies LLCBuy283,800719,100$67,337
Q2 2017Ariel Appreciation FundSell-56,460164,157$18,248
Q2 2017Renaissance Technologies LLCSell-68,400435,300$48,388
Q1 2017Ariel Appreciation FundSell-151,263220,617$21,662
Q1 2017Renaissance Technologies LLCBuy444,800503,700$49,458
Q4 2016Ariel Appreciation FundSell-33,104371,880$34,176
Q4 2016Meritage GroupBuy18,74718,747$1,723

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.