Quest Diagnostics Ownership | Who Owns Quest Diagnostics?

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Quest Diagnostics Ownership Summary

Quest Diagnostics is owned by 95.84% institutional investors, 0.44% insiders, and 3.71% retail investors. Vanguard group is the largest institutional shareholder, holding 12.85% of DGX shares. Vanguard MStar Total Stk Mkt Idx Invest is the top mutual fund, with 3.19% of its assets in Quest Diagnostics shares.

DGX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quest Diagnostics	95.84%	0.44%	3.71%
Sector	Healthcare Stocks	50.59%	12.40%	37.01%
Industry	Diagnostics & Research Stocks	78.38%	9.48%	12.14%

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	9.28M	8.43%	$1.97B
Vanguard capital management	7.23M	6.58%	$1.53B
State street	5.52M	5.02%	$1.17B
Price t rowe associates inc /md/	5.44M	4.95%	$1.15B
Boston partners	4.74M	4.31%	$1.00B
Jpmorgan chase	3.52M	3.20%	$748.59M
Geode capital management	3.14M	2.85%	$662.58M
Morgan stanley	2.46M	2.24%	$521.50M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ivy lane capital management	30.00K	9.21%	$6.36M
M.d. sass	360.45K	4.99%	$76.40M
Longboard asset management, lp	1.04K	3.68%	$219.58K
Edgepoint investment group	2.25M	3.60%	$476.37M
Paradiem	59.47K	2.72%	$12.60M
Artia global partners lp	65.12K	2.55%	$13.80M
Glaxis capital management	5.50K	2.34%	$1.17M
Sgl investment advisors	27.29K	2.24%	$6.48M
Coho partners	89.10K	2.18%	$16.98M
Naples money management	16.70K	1.95%	$2.29M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.41M	0.03%	1.41M
Sixth street partners management company	773.71K	0.02%	773.71K
Boston partners	4.74M	0.89%	732.24K
Fmr	1.40M	0.01%	456.52K
Balyasny asset management	275.37K	0.07%	272.47K

Top Sellers

Holder	Shares	% Assets	Change
Price t rowe associates inc /md/	5.44M	0.12%	-853.00K
Blackrock	10.06M	0.03%	-641.17K
Qube research	343.40K	0.07%	-391.32K
Goldman sachs group	982.69K	0.02%	-366.00K
Jpmorgan chase	3.52M	0.04%	-326.02K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	1.41M	0.03%	1.41M	$298.13M
Sixth street partners management company	773.71K	0.02%	773.71K	$163.99M
Foundry partners	108.32K	0.82%	108.32K	$16.34M
Adage capital partners gp	106.30K	0.03%	106.30K	$22.53M
Simplify asset management	49.72K	0.15%	49.72K	$10.54M

Sold Out

Holder	Change
Kozak & associates	-1.00
Lloyd advisory services, llc.	-1.00
Greenline partners	-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 %
Jun 30, 2026	1,106	2.41%	105,427,893	2.81%	95	1.10%	545	13.78%	346	-8.22%
Mar 31, 2026	665	-37.50%	39,013,593	-63.19%	35	0.39%	277	-43.93%	222	-36.21%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard MStar Total Stk Mkt Idx Invest	3.52M	3.19%	9.82K
Vanguard Morn Total Stk Mkt Idx Investor	3.52M	3.18%	18.76K
Vanguard Total Stock Mkt Idx Inv	3.52M	3.18%	18.76K
Vanguard US Total Market Shares ETF	3.51M	3.17%	2.60K
Vanguard Institutional 500 Index Trust	3.16M	2.83%	19.87K
Vanguard 500 Index Investor	2.91M	2.63%	30.45K
Vanguard Morn Mid Cap Index Instl	2.40M	2.17%	15.31K
Vanguard MStar Mid Cap Index Instl	2.40M	2.17%	-3.25K
Vanguard Mid Cap Index Institutional	2.40M	2.17%	15.31K
Sycamore Mid Cap Value Comp	2.18M	1.95%	2.10M

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 28, 2026	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$105.14K
Aug 28, 2026	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$3.89M
Aug 28, 2026	PREVOZNIK MICHAEL E	SVP & General Counsel	Sell	$1.52M
Jul 28, 2026	DELANEY MARK E	SVP & Chief Commercial Officer	Sell	$376.29K
Jun 04, 2026	KUPPUSAMY KARTHIK	SVP, Clinical Solutions	Sell	$1.63M

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	1
2026 Q2	-	2
2026 Q1	-	17
2025 Q4	-	6
2025 Q3	-	11

DGX Ownership FAQ

Who Owns Quest Diagnostics?

Quest Diagnostics shareholders are primarily institutional investors at 95.84%, followed by 0.44% insiders and 3.72% retail investors. The average institutional ownership in Quest Diagnostics's industry, Diagnostics & Research Stocks, is 78.38%, which Quest Diagnostics exceeds.

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 (9.28M shares, 8.43%). Together, they hold 30.34% 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 9.21% of its assets in 30K Quest Diagnostics shares, valued at 6.36M$.

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

Vanguard MStar Total Stk Mkt Idx Invest is the top mutual fund holder of Quest Diagnostics shares, with 3.19% of its total shares outstanding invested in 3.52M Quest Diagnostics shares.

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