Quest Diagnostics Ownership | Who Owns Quest Diagnostics?

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Quest Diagnostics Ownership Summary

Quest Diagnostics is owned by 95.58% institutional investors, 0.40% insiders, and 4.03% retail investors. Vanguard group is the largest institutional shareholder, holding 12.46% of DGX shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 3.17% of its assets in Quest Diagnostics shares.

DGX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quest Diagnostics	95.58%	0.40%	4.03%
Sector	Healthcare Stocks	487.91%	11.08%	-398.99%
Industry	Diagnostics & Research Stocks	57.29%	10.84%	31.88%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	13.96M	12.46%	$2.11B
Blackrock funding, inc. /de	10.31M	9.21%	$1.85B
Blackrock	10.06M	9.06%	$1.38B
Price t rowe associates inc /md/	5.49M	4.90%	$828.26M
State street	5.22M	4.70%	$787.72M
Victory capital management	3.36M	3.00%	$506.89M
Geode capital management	2.69M	2.40%	$404.76M
Jpmorgan chase	2.43M	2.17%	$367.18M
Dimensional fund advisors lp	2.04M	1.82%	$307.98M
Morgan stanley	1.89M	1.70%	$258.67M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ivy lane capital management	50.00K	4.95%	$8.98M
Integral health asset management	150.00K	2.47%	$26.94M
Atwater malick	42.94K	2.38%	$8.18M
Coho partners	89.10K	2.18%	$16.98M
Fiduciary management inc /wi/	1.19M	2.04%	$212.92M
Delta capital management	20.31K	2.00%	$3.87M
Naples money management	16.70K	1.95%	$2.29M
Jgp wealth management	82.22K	1.65%	$14.88M
Farrow financial	13.99K	1.52%	$2.51M
Crawford investment counsel	484.96K	1.52%	$87.11M

Top Buyers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	5.49M	0.10%	1.64M
Norges bank	1.27M	0.03%	1.27M
Jpmorgan chase	2.43M	0.03%	916.90K
M&g	1.07M	1.06%	771.82K
Ubs group	964.99K	0.03%	588.48K

Top Sellers

Holder	Shares	% Assets	Change
Davis selected advisers	1.35M	1.30%	-1.03M
Nuance investments	-	-	-681.64K
Blackrock	10.06M	0.03%	-641.17K
Wellington management group llp	1.78M	0.05%	-549.28K
8 knots management	-	-	-497.61K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.27M	0.03%	1.27M	$191.82M
Artemis investment management llp	223.45K	0.51%	223.45K	$40.14M
Foundry partners	108.32K	0.82%	108.32K	$16.34M
Csm advisors	101.75K	0.53%	101.75K	$18.28M
Payden & rygel	93.60K	1.39%	93.60K	$16.81M

Sold Out

Holder	Change
Greenline partners	-1.00
Halbert hargrove global advisors	-1.00
Kozak & associates	-1.00
Macroview investment management	-2.00
Gradient investments	-3.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	979	0.31%	107,047,417	5.20%	95	1.14%	471	3.29%	320	-3.32%
Mar 31, 2025	963	6.41%	101,224,949	2.29%	91	1.15%	452	5.12%	328	10.07%
Dec 31, 2024	877	2.10%	98,448,593	2.51%	88	1.21%	416	9.19%	286	-6.23%
Sep 30, 2024	848	-	95,876,144	-1.23%	85	1.12%	379	5.57%	300	0.33%
Jun 30, 2024	836	1.33%	96,911,812	-0.91%	87	1.12%	353	1.15%	294	-5.47%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	3.51M	3.17%	2.60K
Vanguard Total Stock Mkt Idx Inv	3.51M	3.14%	-81.01K
Vanguard Institutional 500 Index Trust	3.16M	2.83%	19.87K
Vanguard 500 Index Investor	2.76M	2.47%	-404.70K
Vanguard Mid Cap Index Institutional	2.49M	2.23%	26.89K
Sycamore Mid Cap Value Comp	2.18M	1.95%	2.10M
Victory Sycamore Established Value R	1.90M	1.70%	-280.00K
T. Rowe Price U.S. Large-Cap Core Tr-B	1.57M	1.41%	47.37K
Fidelity 500 Index	1.42M	1.27%	605.00
SPDR® S&P 500 ETF	1.38M	1.24%	-29.12K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Oct 22, 2025	PFEIFFER GARY M	-	Sell	$270.32K
Sep 26, 2025	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$27.17K
Sep 26, 2025	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$15.54K
Sep 24, 2025	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$32.73K
Sep 23, 2025	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$5.29M

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	1
2025 Q3	-	11
2025 Q2	-	18
2025 Q1	-	12
2024 Q4	-	11

DGX Ownership FAQ

Who Owns Quest Diagnostics?

Quest Diagnostics shareholders are primarily institutional investors at 95.58%, followed by 0.40% insiders and 4.02% retail investors. The average institutional ownership in Quest Diagnostics's industry, Diagnostics & Research Stocks, is 57.29%, which Quest Diagnostics exceeds.

Who owns the most shares of Quest Diagnostics?

Quest Diagnostics’s largest shareholders are Vanguard group (13.96M shares, 12.46%), Blackrock funding, inc. /de (10.31M shares, 9.21%), and Blackrock (10.06M shares, 9.06%). Together, they hold 30.74% of Quest Diagnostics’s total shares outstanding.

Does Blackrock own Quest Diagnostics?

Yes, BlackRock owns 9.06% of Quest Diagnostics, totaling 10.06M shares as of Jun 2024. This represents 0.03% of BlackRock's total assets, with a market value of 1.38B$. In the last quarter, BlackRock decreased its holdings by -641K shares, a -5.99% change.

Who is Quest Diagnostics’s biggest shareholder by percentage of total assets invested?

Ivy lane capital management is Quest Diagnostics’s biggest shareholder by percentage of total assets invested, with 4.95% of its assets in 50K Quest Diagnostics shares, valued at 8.98M$.

Who is the top mutual fund holder of Quest Diagnostics shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Quest Diagnostics shares, with 3.17% of its total shares outstanding invested in 3.51M Quest Diagnostics shares.

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