$IDXX

$560.92 -$9.29 (1.63%) Live

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

Ownership

13F as of Q2 2026 · 78.8M shares outstanding

Who owns IDXX?

By type of holder

Institutions 93.3% Insiders 0.4% Everyone else 6.3%

Concentration Top 10 holders own 41.5%

BlackRock, Inc. 10.4% · Vanguard Capital Management LLC 6.5%

Institutional ownership

93.3%

+1.0 pts vs last qtr

Institutional holders

1,287

-20 vs last qtr

Net shares bought

+775.6K

by institutions in Q2 2026

New / sold out

114 / 134

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

FMR LLC +539.7K
Norges Bank NEW +353.9K

Biggest sellers in Q2 2026

Capital World Investors SOLD OUT −497.9K
Fundsmith LLP −445.9K

Who is planning to sell?

Notices of proposed sale, last 12 months

$38.4M

9 notices from 7 people

Shares covered

58.9K

0.07% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Jonathan J Mazelsky Officer $15.3M
Nimrata K Hunt Officer $9.53M

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

−10.8%

−1.27% a year

Each share's claim on the business

+12.2%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$5.13B vs $406M

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+ years82% 3–5 years4% 1–3 years8% Under 1 year6%

Quarterly turnover

7.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting IDXX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	8.2M	10.37%	−195.4K (−2.3%)	≤2021	0.1%
Shares held by quarter Peak holding9.4M (Q3'24) Change over 8 quarters−1.2M Share of the company10.370% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	5.2M	6.54%	−30.3K (−0.6%)	≤2021	0.1%
Shares held by quarter Peak holding5.2M (Q1'26) Change over 8 quarters+5.2M Share of the company6.540% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

8.2M

% of company

10.37%

Change vs last qtr

−195.4K (−2.3%)

Held since

≤2021

Vanguard Capital Management LLC

5.2M

% of company

6.54%

Change vs last qtr

−30.3K (−0.6%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting IDXX on Form N-PORT; together they hold 41.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$1.32B	2.5M	3.18%	0.06%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$1.08B	2.0M	2.59%	0.06%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$1.32B

% of company

3.18%

% of the fund

0.06%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$1.08B

% of company

2.59%

% of the fund

0.06%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding IDEXX Laboratories, 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
MJ Mazelsky Jay Insider	83.8K	0.11%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.110% Mazelsky Jay's insider activity →
MB Mckeon Brian P Insider	67.6K	0.09%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.090% Mckeon Brian P's insider activity →

Mazelsky Jay

Insider

83.8K

% of company

0.11%

Change vs last qtr

—

Held since

—

Mckeon Brian P

Insider

67.6K

% of company

0.09%

Change vs last qtr

—

Held since

—

16 more holders behind a free account

See every insider and 5%+ holder of IDEXX Laboratories, Inc..

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