Quest Diagnostics Ownership | Who Owns Quest Diagnostics?

Overview Forecast RevenueFinancials Chart Transcripts

Quest Diagnostics Ownership Summary

Quest Diagnostics is owned by 35.15% institutional investors, 0.42% insiders, and 64.44% 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	35.15%	0.42%	64.44%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Diagnostics & Research Stocks	50.92%	10.77%	38.30%

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	9.17M	8.26%	$1.80B
Price t rowe associates inc /md/	6.30M	5.67%	$1.23B
State street	5.38M	4.85%	$1.05B
Boston partners	4.01M	3.61%	$786.65M
Jpmorgan chase	3.85M	3.47%	$758.37M
Geode capital management	3.09M	2.78%	$602.66M
Morgan stanley	2.48M	2.23%	$485.98M
Edgepoint investment group	2.24M	2.02%	$439.75M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ivy lane capital management	29.00K	8.59%	$5.68M
M.d. sass	299.46K	4.45%	$58.69M
Edgepoint investment group	2.24M	3.52%	$439.75M
Longboard asset management, lp	1.04K	3.51%	$203.03K
Paradiem	71.48K	3.09%	$14.01M
Coho partners	89.10K	2.18%	$16.98M
Sgl investment advisors	28.26K	2.01%	$5.36M
Naples money management	16.70K	1.95%	$2.29M
Delta capital management	17.81K	1.92%	$3.49M
Artia global partners lp	40.82K	1.76%	$8.00M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	1.32M	0.02%	1.32M
Vanguard fiduciary trust	619.18K	0.03%	619.18K
Edgepoint investment group	2.24M	3.52%	582.80K
M.d. sass	299.46K	4.45%	299.46K
Woodline partners lp	593.74K	0.44%	252.37K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	10.06M	0.03%	-641.17K
Pacer advisors	-	-	-447.73K
Ubs group	702.34K	0.02%	-412.11K
Goldman sachs group	1.35M	0.03%	-360.23K
Fiduciary management inc /wi/	720.99K	1.75%	-325.94K

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
M.d. sass	299.46K	4.45%	299.46K	$58.69M
Vanguard global advisers	242.53K	0.03%	242.53K	$47.53M
Clark capital management group	235.42K	0.28%	235.42K	$46.14M

Sold Out

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

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	963	6.41%	101,224,949	2.29%	91	1.15%	452	5.12%	328	10.07%

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	3.50M	3.16%	8.38K
Vanguard Institutional 500 Index Trust	3.16M	2.83%	19.87K
Vanguard 500 Index Investor	2.85M	2.57%	50.61K
Vanguard Mid Cap Index Institutional	2.38M	2.15%	5.26K
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 35.15%, followed by 0.42% insiders and 64.43% retail investors. The average institutional ownership in Quest Diagnostics's industry, Diagnostics & Research Stocks, is 50.92%, 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 (9.17M shares, 8.26%). Together, they hold 30.18% 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 8.59% of its assets in 29K Quest Diagnostics shares, valued at 5.68M$.

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.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis

Discover trending investment themes
Find your next best investment
Research stocks using tools