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 2016Renaissance Technologies LLCSell-48,72058,900$5,413
Q3 2016Ariel Appreciation FundSell-49,551404,984$34,274
Q2 2016Ariel Appreciation FundSell-292,559454,535$37,004
Q1 2016Ariel Appreciation FundBuy53,841747,094$53,380
Q4 2015Ariel Appreciation FundSell-2,479693,253$49,318
Q3 2015Ariel Appreciation FundBuy115,177695,732$42,767
Q3 2015Renaissance Technologies LLCBuy53,420107,620$6,615
Q2 2015Ariel Appreciation FundBuy64,597580,555$42,102
Q2 2015Renaissance Technologies LLCSell-529,90054,200$3,931
Q1 2015Ariel Appreciation FundBuy129,450515,958$39,651
Q1 2015Renaissance Technologies LLCSell-266,600584,100$44,888
Q4 2014Ariel Appreciation FundBuy37,598386,508$25,919
Q4 2014Olstein Capital ManagementSell-23,00059,000$3,957
Q4 2014Renaissance Technologies LLCBuy723,000850,700$57,048
Q3 2014Hancock Classic ValueSell-1,400429,700$26,074
Q3 2014Jensen Investment ManagementSell-608,070$490
Q3 2014Ariel Appreciation FundSell-4,018348,910$21,172
Q2 2014Hancock Classic ValueSell-541,100431,100$25,301
Q2 2014Jensen Investment ManagementSell-1,8608,130$477
Q2 2014Ariel Appreciation FundBuy57,769352,928$20,713
Q2 2014Olstein Capital ManagementSell-18,00082,000$4,813
Q1 2014Hancock Classic ValueSell-242,850972,200$56,310
Q1 2014Jensen Investment ManagementBuy1,9409,990$579
Q1 2014Ariel Appreciation FundBuy27,106295,159$17,096
Q1 2014Olstein Capital ManagementBuy7,000100,000$5,792
Q4 2013Olstein Capital ManagementBuy10,00093,000$4,979
Q4 2013Hancock Classic ValueBuy544,4001,215,050$65,054
Q4 2013Jensen Investment ManagementBuy4008,050$431
Q4 2013Ariel Appreciation FundBuy219,114268,053$14,352
Q3 2013Hancock Classic ValueBuy5,275670,650$41,439

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.