$DGX

$242.95 +$1.06 (0.44%) Close

$DGX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 110.0M shares outstanding

Who owns DGX?

By type of holder

Institutions 95.2% Insiders 0.5% Everyone else 4.3%

Concentration Top 10 holders own 45.2%

BlackRock, Inc. 8.4% · Vanguard Capital Management LLC 6.6%

Institutional ownership

95.2%

+2.0 pts vs last qtr

Institutional holders

1,096

+36 vs last qtr

Net shares bought

+2.2M

by institutions in Q2 2026

New / sold out

121 / 85

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +1.4M
Boston Partners +732.2K

Biggest sellers in Q2 2026

Price T Rowe Associates Inc /MD/ −853.0K
Qube Research & Technologies Ltd −391.3K

Who is planning to sell?

Notices of proposed sale, last 12 months

$36.8M

21 notices from 8 people

Shares covered

177.1K

0.16% of the company

Arranged in advance

99%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Davis J. E. Officer 10b5-1 $17.1M
Doherty Catherine T. Officer 10b5-1 $7M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−20.4%

−2.51% a year

Each share's claim on the business

+25.7%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$6.54B vs $771M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years78% 3–5 years1% 1–3 years15% Under 1 year6%

Quarterly turnover

6.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting DGX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	9.3M	8.43%	+103.1K (+1.1%)	≤2021	0.0%
Shares held by quarter Peak holding10.3M (Q2'25) Change over 8 quarters−862.7K Share of the company8.430% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	7.2M	6.57%	+87.7K (+1.2%)	≤2021	0.0%
Shares held by quarter Peak holding7.2M (Q2'26) Change over 8 quarters+7.2M Share of the company6.570% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

9.3M

% of company

8.43%

Change vs last qtr

+103.1K (+1.1%)

Held since

≤2021

Vanguard Capital Management LLC

7.2M

% of company

6.57%

Change vs last qtr

+87.7K (+1.2%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Quest Diagnostics Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting DGX on Form N-PORT; together they hold 41.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$745M	3.5M	3.19%	0.03%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$608M	2.9M	2.61%	0.04%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$745M

% of company

3.19%

% of the fund

0.03%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$608M

% of company

2.61%

% of the fund

0.04%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Quest Diagnostics Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
DJ Davis J. E. Insider	122.4K	0.11%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.110% Davis J. E.'s insider activity →
DC Doherty Catherine T. Insider	71.9K	0.07%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.070% Doherty Catherine T.'s insider activity →

Davis J. E.

Insider

122.4K

% of company

0.11%

Change vs last qtr

—

Held since

—

Doherty Catherine T.

Insider

71.9K

% of company

0.07%

Change vs last qtr

—

Held since

—

16 more holders behind a free account

See every insider and 5%+ holder of Quest Diagnostics Inc.

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