DGX Institutional Ownership Changes & 13F Activity
QUEST DIAGNOSTICS INC (DGX) institutional ownership data tracks hedge funds, asset managers, pension funds, and institutional investors holding Amazon shares based on recent SEC 13F filings (Q1 2026). Recent filings show notable position changes from firms including Olstein Capital Management, Sequoia Financial Advisors, First Eagle U.S. Value, Causeway Capital Management, and Renaissance Technologies LLC. This page analyzes institutional buying and selling activity, increased and reduced positions, new holdings, and sold-out positions to help investors understand institutional sentiment, portfolio allocation trends, and hedge fund conviction in QUEST DIAGNOSTICS INC stock.
Key Insights:
- Q1 2026 SEC 13F filings show notable institutional position changes in DGX.
- Olstein Capital Management, Sequoia Financial Advisors, First Eagle U.S. Value, Causeway Capital Management, and Renaissance Technologies LLC were among firms reporting significant share count changes.
- Institutional ownership trends can help investors monitor hedge fund sentiment and long-term conviction in DGX stock.
Related DGX Insights:
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q1 2021 | Olstein Capital Management | Buy | 22,000 | 62,000 | $7,957 |
| Q1 2021 | Renaissance Technologies LLC | Sell | -354,100 | 268,700 | $34,485 |
| Q1 2021 | Causeway Capital Management | Buy | 319,572 | 319,572 | $41,014 |
| Q4 2020 | Olstein Capital Management | Sell | -19,000 | 40,000 | $4,767 |
| Q4 2020 | Renaissance Technologies LLC | Buy | 562,100 | 622,800 | $74,219 |
| Q3 2020 | Renaissance Technologies LLC | Sell | -97,000 | 60,700 | $6,950 |
| Q2 2020 | Lountzis Asset Management | Buy | 450 | 450 | $51 |
| Q1 2020 | Ariel Appreciation Fund | Buy | 190,909 | 592,375 | $47,568 |
| Q1 2020 | Renaissance Technologies LLC | Buy | 26,400 | 157,700 | $12,663 |
| Q4 2019 | Ariel Appreciation Fund | Sell | -9,602 | 401,466 | $42,873 |
| Q4 2019 | Renaissance Technologies LLC | Buy | 35,000 | 131,300 | $14,022 |
| Q3 2019 | Ariel Appreciation Fund | Buy | 11,054 | 411,068 | $43,997 |
| Q3 2019 | Renaissance Technologies LLC | Buy | 70,580 | 96,300 | $10,307 |
| Q2 2019 | Ariel Appreciation Fund | Buy | 6,263 | 400,014 | $40,725 |
| Q1 2019 | Ariel Appreciation Fund | Buy | 39,709 | 393,751 | $35,406 |
| Q1 2019 | Renaissance Technologies LLC | Sell | -23,100 | 25,720 | $2,313 |
| Q4 2018 | Ariel Appreciation Fund | Buy | 93,781 | 354,042 | $29,481 |
| Q4 2018 | Renaissance Technologies LLC | Sell | -210,580 | 48,820 | $4,065 |
| Q3 2018 | Ariel Appreciation Fund | Buy | 16,662 | 260,261 | $28,085 |
| Q3 2018 | Renaissance Technologies LLC | Sell | -80,400 | 259,400 | $27,992 |
| Q2 2018 | Ariel Appreciation Fund | Buy | 3,157 | 243,599 | $26,781 |
| Q1 2018 | Ariel Appreciation Fund | Sell | -7,690 | 240,442 | $24,116 |
| Q1 2018 | Renaissance Technologies LLC | Sell | -525,400 | 339,800 | $34,082 |
| Q4 2017 | Ariel Appreciation Fund | Buy | 114,292 | 248,132 | $24,439 |
| Q4 2017 | Renaissance Technologies LLC | Buy | 146,100 | 865,200 | $85,214 |
| Q3 2017 | Ariel Appreciation Fund | Sell | -30,317 | 133,840 | $12,533 |
| Q3 2017 | Renaissance Technologies LLC | Buy | 283,800 | 719,100 | $67,337 |
| Q2 2017 | Ariel Appreciation Fund | Sell | -56,460 | 164,157 | $18,248 |
| Q2 2017 | Renaissance Technologies LLC | Sell | -68,400 | 435,300 | $48,388 |
| Q1 2017 | Ariel Appreciation Fund | Sell | -151,263 | 220,617 | $21,662 |
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.