Quest Diagnostics

DGX • NYSE

Quest Diagnostics is a medical - diagnostics & research company in the healthcare sector on NYSE, led by James E. Davis, with a market cap of $20.3B. As of Q3 2025, 93% of shares are held by 970 institutional investors, with VANGUARD GROUP INC as the largest holder at 12.74%.

Chief Executive Officer and PresidentJames E. Davis

Market Cap$20.3B

Medical - Diagnostics & Research

Healthcare

Employees48.0K

Websitequestdiagnostics.com

Country

United States of America

Overview

Overview of institutional ownership in DGX as of Q3 2025 with a market cap of $21.3B

All Institutions

Institutions: 970
Value Held: $19.8B
Shares Held: 104.2M
Avg Position: $20.5M
Median Position: $718.7K

Hedge Funds

Hedge Funds: 51
Value Held: $495.6M
Shares Held: 2.6M
Avg Position: $9.7M
Median Position: $1.5M

Ownership Breakdown

Institutional (non-HF)

90.76%

$19.3B

Hedge Funds

2.33%

$495.6M

Retail & Other

6.91%

$1.5B

Based on market cap of $21.3B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in DGX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$2.7B 0.04% of portfolio	12.74% 14.3M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$1.9B 0.03% of portfolio	8.94% 10.0M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	Robert W Sharps President	$1.3B 0.15% of portfolio	6.27% 7.0M shares	≤ Q2 2013 Held for 12y 5m+	$912.31B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$995.6M 0.03% of portfolio	4.67% 5.2M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
JPMORGAN CHASE & CO Institution	Jamie Dimon CEO	$822.8M 0.05% of portfolio	3.86% 4.3M shares	≤ Q2 2013 Held for 12y 5m+	$1.56T
Robeco Investment Management, Inc. Long Only Manager	Joseph Francis Feeney CEO	$768.0M 0.78% of portfolio	3.61% 4.0M shares	Q1 2025 Held for 8 months	$97.8B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$576.4M 0.04% of portfolio	2.72% 3.0M shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	David Craig Brown CEO	$446.7M 0.28% of portfolio	2.10% 2.3M shares	Q2 2015 Held for 10y 5m	$158.22B
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$435.8M 0.03% of portfolio	2.05% 2.3M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$363.5M 0.08% of portfolio	1.71% 1.9M shares	≤ Q2 2013 Held for 12y 5m+	$466.32B

Net Capital Flow

Institutional buying and selling activity for DGX in Q3 2025

Traded: −$174.7M
Buyers: 463
Sellers: 411
Total Bought: +$1.1B
Total Sold: −$1.3B
Avg Position: $18.9M

Biggest Buyers

Institution	Net Bought	Current Position
Robeco Investment Management, Inc. Long Only Manager	+$189.7M +997.0K shares	$768.0M 4.0M shares
EdgePoint Investment Group Inc. Long Only Manager	+$161.7M +848.5K shares	$161.9M 849.8K shares
P Pacer Advisors, Inc. Institution	+$82.7M +433.8K shares	$85.9M 450.9K shares
GOLDMAN SACHS GROUP INC Institution	+$79.7M +418.0K shares	$202.7M 1.1M shares
Marshall Wace LLP Institution	+$67.1M +352.1K shares	$106.2M 557.2K shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$42.2M +221.5K shares	$42.2M 221.5K shares
A Artemis Investment Management LLP Institution	+$39.7M +208.2K shares	$82.3M 431.6K shares
Quantinno Capital Management LP Hedge Fund•Market Neutral	+$27.0M +141.8K shares	$36.9M 193.5K shares
MORGAN STANLEY RIA/Wealth	+$27.0M +141.8K shares	$435.8M 2.3M shares
Q Qube Research & Technologies Ltd Institution	+$21.4M +112.3K shares	$101.0M 529.8K shares

Biggest Sellers

Institution	Net Sold	Current Position
ALLIANCEBERNSTEIN L.P. Long Only Manager	−$115.7M −607.1K shares	$121.0M 634.8K shares
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	−$88.7M −465.3K shares	$446.7M 2.3M shares
R ROYAL BANK OF CANADA Institution	−$79.3M −415.9K shares	$90.0M 472.2K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$60.0M −314.9K shares	$171.8M 901.6K shares
UBS Group AG Institution	−$59.9M −314.2K shares	$126.6M 664.3K shares
B BlackRock, Inc. Institution	−$59.3M −310.9K shares	$1.9B 10.0M shares
ING INVESTMENT MANAGEMENT LLC Insurance Manager	−$47.7M −250.2K shares	$29.2M 153.4K shares
RTW INVESTMENTS, LLC Hedge Fund•Sector	−$47.6M −250.0K shares	$47.6M 250.0K shares
S Squarepoint Ops LLC Hedge Fund•Quant	−$39.3M −206.0K shares	$121.5M 637.3K shares
N Neuberger Berman Group LLC Institution	−$37.7M −197.8K shares	$98.8M 518.5K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited DGX in Q3 2025

New Positions: 56
New Value: $21.4M
Exited Positions: 82
Exited Value: $121.9M

New Positions

Institution	Position Value
F FIRST NATIONAL BANK OF OMAHA Institution	$8.8M 46.3K shares
Dynasty Wealth Management, LLC Fund of Funds	$1.9M 9.7K shares
KLEIN PAVLIS & PEASLEY FINANCIAL, INC. RIA/Wealth	$1.1M 5.8K shares
Voleon Capital Management LP Hedge Fund•Quant	$610.0K 3.2K shares
Hobart Private Capital, LLC RIA/Wealth	$563.9K 3.0K shares
N NEOS Investment Management LLC Institution	$448.1K 2.4K shares
T TrueMark Investments, LLC Institution	$438.5K 2.3K shares
Requisite Capital Management, LLC RIA/Wealth	$428.6K 2.2K shares
F Fairvoy Private Wealth, LLC RIA/Wealth	$389.5K 2.0K shares
V Vise Technologies, Inc. Institution	$372.2K 2.0K shares

Exited Positions

Institution	Previous Position
WEDGE CAPITAL MANAGEMENT L L P/NC Long Only Manager	$31.3M 174.3K shares
Distillate Capital Partners LLC ETF Provider	$16.8M 93.8K shares
A ADAMS EXPRESS CO Long Only Manager	$9.4M 52.1K shares
Parkman Healthcare Partners LLC Hedge Fund•Long/Short	$7.4M 41.0K shares
M Mediolanum International Funds Ltd Institution	$7.0M 39.2K shares
Connor, Clark & Lunn Investment Management Ltd. Long Only Manager	$5.1M 28.4K shares
Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy	$4.6M 25.4K shares
NICHOLAS CO INC /WI Long Only Manager	$3.3M 18.3K shares
N NKCFO LLC RIA/Wealth	$3.0M 16.7K shares
B Bayesian Capital Management, LP Hedge Fund•Quant	$2.8M 15.7K shares

Options Activity

Institutions with the largest Call and Put options positions in DGX as of Q3 2025

Call Positions: 16
Call Value: $92.1M
Put Positions: 13
Put Value: $101.8M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$39.0M 2.0K contracts
J JANE STREET GROUP, LLC Institution	$16.1M 847.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$11.6M 609.0 contracts
W WOLVERINE TRADING, LLC Institution	$7.1M 376.0 contracts
WELLS FARGO & COMPANY/MN Institution	$3.7M 196.0 contracts
P Parallax Volatility Advisers, LLC Hedge Fund•Vol Arbitrage	$3.4M 180.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$3.2M 167.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$2.8M 149.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$2.6M 137.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$1.2M 64.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$51.7M 2.7K contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$35.8M 1.9K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$6.9M 363.0 contracts
W WOLVERINE TRADING, LLC Institution	$3.0M 159.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$2.1M 110.0 contracts
J JANE STREET GROUP, LLC Institution	$1.4M 71.0 contracts
Walleye Trading LLC RIA/Wealth	$438.3K 23.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$228.7K 12.0 contracts
CAPSTONE INVESTMENT ADVISORS, LLC Hedge Fund•Multi-Strategy	$209.6K 11.0 contracts
WELLS FARGO & COMPANY/MN Institution	$95.3K 5.0 contracts

Most Committed Institutions

Institutions with DGX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
IVY LANE CAPITAL MANAGEMENT, LLC Hedge Fund•Value	Robert Waldemar Koehn Managing Partner	6.18% $5.5M	0.03% 29.0K shares	Q1 2024 Held for 1y 8m	$89.4M
8 8 KNOTS MANAGEMENT, LLC Hedge Fund•Long/Short	Scott Joshua Green CEO	5.94% $52.5M	0.25% 275.3K shares	Q1 2025 Held for 8 months	$884.1M
A Artia Global Partners LP Hedge Fund•Long/Short	Onusa Nmn Chantanapongwanij Managing Partner	2.74% $15.6M	0.07% 81.7K shares	Q1 2025 Held for 8 months	$568.3M
Atwater Malick LLC RIA/Wealth	Matthew Charles Malick Managing Partner	2.38% $8.2M	0.04% 42.9K shares	Q4 2018 Held for 6y 11m	$344.4M
F FIDUCIARY MANAGEMENT INC /WI/ Long Only Manager	John Scott Brandser CEO	2.22% $218.7M	1.03% 1.1M shares	Q1 2024 Held for 1y 8m	$9.9B
DELTA CAPITAL MANAGEMENT LLC Long Only Manager	William Francis Coughlin Member	2.19% $3.9M	0.02% 20.3K shares	Q1 2021 Held for 4y 8m	$177.0M
Coho Partners, Ltd. Long Only Manager	Glenn Alan Dever President	2.18% $17.0M	0.08% 89.1K shares	Q1 2025 Held for 8 months	$779.1M
SGL Investment Advisors, Inc. RIA/Wealth	Scott Gregory Long Chairman	2.11% $5.0M	0.03% 28.0K shares	Q3 2024 Held for 1y 2m	$237.4M
Sivik Global Healthcare LLC Hedge Fund•Long/Short	Krishen Kumar Sud Managing Partner	2.06% $3.8M	0.02% 20.0K shares	Q2 2025 Held for 5 months	$184.7M
P Persistent Asset Partners Ltd Institution	-	1.68% $2.3M	0.01% 12.1K shares	Q1 2025 Held for 8 months	$137.1M

Hedge Fund Spotlight

Discover hedge funds investing in DGX

Quent Capital, LLC

Hedge Fund • Long/Short

Portfolio ManagerWilliam Albert Jollie

Portfolio Value: $1.2B
Positions: 1,433
Last Reported: Q3 2025

Sector Allocation

Position in Quest Diagnostics

Market Value: $22.5K
Shares Held: 118.0
Portfolio Weight: 0.00%
Owned Since: 2024-Q4

Top Holding	Sector	Market Value	Weight
1 Vanguard Russell 1000 Growth VONG	ETF ETF	$129.0M	10.81%
2 SPDR Nuveen Bloomberg Short Term Municipal Bond SHM	ETF ETF	$79.3M	6.64%
3 iShares MSCI EAFE Growth EFG	ETF ETF	$59.0M	4.94%