Quest Diagnostics Ownership | Who Owns Quest Diagnostics?

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Quest Diagnostics Ownership Summary

Quest Diagnostics is owned by 22.97% institutional investors, 0.40% insiders, and 76.64% retail investors. Vanguard group is the largest institutional shareholder, holding 12.85% 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	22.97%	0.40%	76.64%
Sector	Healthcare Stocks	232.86%	10.65%	-143.51%
Industry	Diagnostics & Research Stocks	35.92%	10.61%	53.47%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	14.39M	12.85%	$2.50B
Blackrock	10.06M	9.06%	$1.38B
Blackrock funding, inc. /de	9.46M	8.52%	$1.64B
Price t rowe associates inc /md/	7.01M	6.26%	$1.34B
State street	5.22M	4.66%	$995.58M
Jpmorgan chase	4.15M	3.70%	$719.44M
Boston partners	4.04M	3.60%	$767.98M
Geode capital management	3.03M	2.73%	$523.52M
Morgan stanley	2.69M	2.43%	$467.42M
Victory capital management	2.34M	2.09%	$446.71M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ivy lane capital management	29.00K	6.18%	$5.53M
Longboard asset management, lp	1.04K	3.51%	$203.03K
Paradiem	71.48K	3.09%	$14.01M
Artia global partners lp	81.72K	2.47%	$15.57M
Sgl investment advisors	28.50K	2.19%	$5.48M
Coho partners	89.10K	2.18%	$16.98M
Fiduciary management inc /wi/	1.05M	2.00%	$181.67M
Naples money management	16.70K	1.95%	$2.29M
Delta capital management	17.81K	1.92%	$3.49M
Willis investment counsel	151.80K	1.62%	$29.75M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.32M	0.02%	1.32M
Boston partners	4.04M	0.79%	997.03K
Edgepoint investment group	849.75K	1.21%	848.48K
Goldman sachs group	1.71M	0.04%	644.95K
Vanguard fiduciary trust	619.18K	0.03%	619.18K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	10.06M	0.03%	-641.17K
Alliancebernstein	634.77K	0.04%	-607.08K
Blackrock funding, inc. /de	9.46M	0.03%	-542.82K
Victory capital management	2.34M	0.26%	-465.25K
Pacer advisors	-	-	-447.73K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.32M	0.02%	1.32M	$229.52M
Vanguard fiduciary trust	619.18K	0.03%	619.18K	$121.35M
Vanguard global advisers	242.53K	0.03%	242.53K	$47.53M
Vanguard asset management	226.73K	0.04%	226.73K	$44.43M
Foundry partners	108.32K	0.82%	108.32K	$16.34M

Sold Out

Holder	Change
Halbert hargrove global advisors	-1.00
Greenline partners	-1.00
Kozak & associates	-1.00
Financial gravity asset management	-2.00
Palisade asset management	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	472	-53.63%	25,722,396	-75.45%	22	0.26%	211	-55.67%	151	-55.46%
Sep 30, 2025	586	-41.05%	31,931,869	-68.94%	28	0.34%	279	-41.39%	172	-46.58%
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%

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	3.49M	3.15%	-26.87K
Vanguard Institutional 500 Index Trust	3.16M	2.83%	19.87K
Vanguard 500 Index Investor	2.80M	2.53%	-61.98K
Vanguard Mid Cap Index Institutional	2.37M	2.14%	-44.39K
Sycamore Mid Cap Value Comp	2.18M	1.95%	2.10M
T. Rowe Price U.S. Large-Cap Core Tr-B	1.57M	1.41%	47.37K
iShares Core S&P 500 ETF	1.42M	1.29%	4.16K
Fidelity 500 Index	1.40M	1.27%	-10.92K
SPDR® S&P 500 ETF	1.38M	1.24%	-29.12K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 05, 2026	Doherty Catherine T.	EVP, Regional Businesses	Sell	$1.15M
Mar 05, 2026	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$799.68K
Mar 05, 2026	Plewman Patrick	SVP for Diagnostic Services	Sell	$588.73K
Mar 04, 2026	KUPPUSAMY KARTHIK	SVP, Clinical Solutions	Sell	$538.37K
Mar 03, 2026	Doherty Catherine T.	EVP, Regional Businesses	Sell	$131.29K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	-
2026 Q1	-	17
2025 Q4	-	6
2025 Q3	-	11
2025 Q2	-	18

DGX Ownership FAQ

Who Owns Quest Diagnostics?

Quest Diagnostics shareholders are primarily institutional investors at 22.97%, followed by 0.40% insiders and 76.63% retail investors. The average institutional ownership in Quest Diagnostics's industry, Diagnostics & Research Stocks, is 35.92%, which Quest Diagnostics falls below.

Who owns the most shares of Quest Diagnostics?

Quest Diagnostics’s largest shareholders are Vanguard group (14.39M shares, 12.85%), Blackrock (10.06M shares, 9.06%), and Blackrock funding, inc. /de (9.46M shares, 8.52%). Together, they hold 30.43% 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 6.18% of its assets in 29K Quest Diagnostics shares, valued at 5.53M$.

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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