Idexx Laboratories

IDXX • NASDAQ

Idexx Laboratories is a medical - diagnostics & research company in the healthcare sector on NASDAQ, led by Duncan D. McCulloch, with a market cap of $57.3B. As of Q3 2025, 90% of shares are held by 1,258 institutional investors, with VANGUARD GROUP INC as the largest holder at 12.45%.

Chief Executive OfficerDuncan D. McCulloch

Market Cap$57.3B

Medical - Diagnostics & Research

Healthcare

Employees11.0K

Websiteidexx.com

Country

United States of America

Overview

Overview of institutional ownership in IDXX as of Q3 2025 with a market cap of $51.1B

All Institutions

Institutions: 1,258
Value Held: $45.7B
Shares Held: 71.6M
Avg Position: $36.4M
Median Position: $1.0M

Hedge Funds

Hedge Funds: 61
Value Held: $654.2M
Shares Held: 1.0M
Avg Position: $10.7M
Median Position: $1.2M

Ownership Breakdown

Institutional (non-HF)

88.23%

$45.1B

Hedge Funds

1.28%

$654.2M

Retail & Other

10.49%

$5.4B

Based on market cap of $51.1B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in IDXX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$6.4B 0.10% of portfolio	12.45% 10.0M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$5.2B 0.09% of portfolio	10.26% 8.2M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$2.2B 0.08% of portfolio	4.40% 3.5M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
Fundsmith LLP Long Only Manager	Terence Charles Smith CEO	$1.7B 8.43% of portfolio	3.26% 2.6M shares	Q1 2015 Held for 10y 8m	$19.8B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$1.6B 0.10% of portfolio	3.12% 2.5M shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
Bank of New York Mellon Corp Institution	Robin Vince CEO	$1.3B 0.24% of portfolio	2.57% 2.1M shares	≤ Q2 2013 Held for 12y 5m+	$556.34B
BAMCO INC /NY/ Long Only Manager	Ronald Stephen Baron CEO	$1.2B 3.20% of portfolio	2.36% 1.9M shares	≤ Q2 2013 Held for 12y 5m+	$37.7B
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$1.0B 0.06% of portfolio	2.03% 1.6M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$843.5M 0.13% of portfolio	1.65% 1.3M shares	≤ Q2 2013 Held for 12y 5m+	$633.08B
PRINCIPAL FINANCIAL GROUP INC Institution	Deanna Strable CEO	$840.6M 0.43% of portfolio	1.64% 1.3M shares	≤ Q2 2013 Held for 12y 5m+	$197.71B

Net Capital Flow

Institutional buying and selling activity for IDXX in Q3 2025

Net Flow: −$1.5B
Buyers: 421
Sellers: 559
Total Bought: +$2.0B
Total Sold: −$3.6B
Avg Position: $37.8M

Biggest Buyers

Institution	Net Bought	Current Position
Bank of New York Mellon Corp Institution	+$386.7M +605.3K shares	$1.3B 2.1M shares
JPMORGAN CHASE & CO Institution	+$208.5M +326.3K shares	$555.8M 869.9K shares
PRINCIPAL FINANCIAL GROUP INC Institution	+$120.1M +188.0K shares	$840.6M 1.3M shares
Invesco Ltd. ETF Provider	+$103.4M +161.8K shares	$843.5M 1.3M shares
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	+$101.0M +158.1K shares	$443.5M 694.2K shares
R Railway Pension Investments Ltd Institution	+$90.9M +142.2K shares	$189.5M 296.5K shares
GOLDMAN SACHS GROUP INC Institution	+$78.5M +122.9K shares	$454.9M 711.9K shares
PRUDENTIAL FINANCIAL INC Institution	+$73.7M +115.4K shares	$114.1M 178.5K shares
VANGUARD GROUP INC Institution	+$55.0M +86.0K shares	$6.4B 10.0M shares
FEDERATED INVESTORS INC /PA/ Long Only Manager	+$50.7M +79.4K shares	$69.6M 108.9K shares

Biggest Sellers

Institution	Net Sold	Current Position
G GENERATION INVESTMENT MANAGEMENT LLP Institution	−$196.1M −306.9K shares	$166.4M 260.4K shares
Select Equity Group, L.P. Hedge Fund•Multi-Strategy	−$186.4M −291.7K shares	$180.2M 282.0K shares
V Vontobel Holding Ltd. Institution	−$170.0M −266.2K shares	$94.2M 147.4K shares
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	−$144.4M −226.1K shares	$293.3M 459.0K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$124.3M −194.6K shares	$559.4M 875.5K shares
MONTRUSCO BOLTON INVESTMENTS INC. Long Only Manager	−$123.5M −197.1K shares	$145.6M 232.3K shares
S Squarepoint Ops LLC Hedge Fund•Quant	−$108.9M −170.5K shares	$1.4M 2.1K shares
B BlackRock, Inc. Institution	−$108.0M −169.0K shares	$5.2B 8.2M shares
C Champlain Investment Partners, LLC Long Only Manager	−$103.1M −192.2K shares	Sold Off 0 shares
F FUNDSMITH INVESTMENT SERVICES LTD. Long Only Manager	−$99.8M −156.3K shares	$439.8M 688.4K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited IDXX in Q3 2025

New Positions: 75
New Value: $47.8M
Exited Positions: 78
Exited Value: $341.7M

New Positions

Institution	Position Value
G Genus Capital Management Inc. Institution	$7.9M 12.3K shares
Moran Wealth Management, LLC RIA/Wealth	$7.5M 11.8K shares
C CHAPIN DAVIS, INC. Institution	$5.1M 7.9K shares
T Three Seasons Wealth, LLC RIA/Wealth	$3.3M 5.1K shares
Krilogy Financial LLC RIA/Wealth	$2.9M 4.0K shares
D Dash Acquisitions Inc. Institution	$2.7M 4.3K shares
Union Bankshares Corp Institution	$1.9M 2.9K shares
VestGen Advisors, LLC RIA/Wealth	$1.2M 1.9K shares
Friedenthal Financial RIA/Wealth	$1.1M 1.7K shares
Williamson Legacy Group, LLC RIA/Wealth	$930.2K 1.5K shares

Exited Positions

Institution	Previous Position
C Champlain Investment Partners, LLC Long Only Manager	$103.1M 192.2K shares
T Two Creeks Capital Management, LP Hedge Fund•Long/Short	$61.4M 114.5K shares
A AXA Institution	$31.7M 59.1K shares
Symphony Financial, Ltd. Co. RIA/Wealth	$27.9M 52.0K shares
WORLDQUANT MILLENNIUM QUANTITATIVE STRATEGIES LLC Hedge Fund•Multi-Strategy	$25.3M 47.2K shares
Trexquant Investment LP Hedge Fund•Quant	$22.1M 41.2K shares
W WILSON ASSET MANAGEMENT PTY LTD Institution	$16.6M 31.0K shares
H HRT FINANCIAL LLC Institution	$12.3M 22.9K shares
L Laurel Wealth Advisors LLC RIA/Wealth	$6.3M 11.8K shares
B Bell Asset Management Ltd Long Only Manager	$4.0M 7.5K shares

Options Activity

Institutions with the largest Call and Put options positions in IDXX as of Q3 2025

Call Positions: 17
Call Value: $161.4M
Put Positions: 22
Put Value: $129.8M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$58.5M 916.0 contracts
J JANE STREET GROUP, LLC Institution	$26.7M 418.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$20.4M 320.0 contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$18.1M 283.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$14.4M 226.0 contracts
W WOLVERINE TRADING, LLC Institution	$6.6M 104.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$3.2M 50.0 contracts
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy	$2.8M 44.0 contracts
B BNP PARIBAS ARBITRAGE, SA Institution	$2.4M 0.4 contracts
H HSBC HOLDINGS PLC Institution	$2.2M 35.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$42.7M 669.0 contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$23.4M 366.0 contracts
P PEAK6 LLC Institution	$14.8M 232.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$11.8M 185.0 contracts
J JANE STREET GROUP, LLC Institution	$6.1M 96.0 contracts
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$4.7M 73.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$4.6M 72.0 contracts
B BRANT POINT INVESTMENT MANAGEMENT LLC Hedge Fund•Long/Short	$4.5M 71.0 contracts
B BNP PARIBAS ARBITRAGE, SA Institution	$3.5M 0.6 contracts
W WOLVERINE TRADING, LLC Institution	$3.0M 48.0 contracts

Most Committed Institutions

Institutions with IDXX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Manitou Investment Management Ltd. RIA/Wealth	Mark Gordon Mansfield Gaskin President	10.60% $60.7M	0.12% 95.1K shares	Q2 2022 Held for 3y 5m	$573.1M
CAPITAL COUNSEL LLC/NY RIA/Wealth	Terence Sean Greene President	10.60% $276.4M	0.54% 432.7K shares	≤ Q2 2013 Held for 12y 5m+	$2.6B
Fundsmith LLP Long Only Manager	Terence Charles Smith CEO	8.43% $1.7B	3.26% 2.6M shares	Q1 2015 Held for 10y 8m	$19.8B
Haven Capital Group, Inc. RIA/Wealth	Kristin Wyman Horton President	8.28% $8.7M	0.02% 13.7K shares	Q4 2024 Held for 11 months	$105.5M
LOUNTZIS ASSET MANAGEMENT, LLC Hedge Fund•Value	Apostolos Paul John Lountzis President	6.86% $20.9M	0.04% 32.7K shares	Q1 2025 Held for 8 months	$304.7M
F FUNDSMITH INVESTMENT SERVICES LTD. Long Only Manager	Terence Charles Smith CEO	6.85% $439.8M	0.86% 688.4K shares	Q1 2022 Held for 3y 8m	$6.4B
S Seilern Investment Management Ltd Institution	-	6.52% $90.3M	0.18% 141.3K shares	Q4 2024 Held for 11 months	$1.4B
PERKINS CAPITAL MANAGEMENT INC RIA/Wealth	Richard Charles Perkins President	5.46% $6.2M	0.01% 9.7K shares	Q3 2020 Held for 5y 2m	$113.5M
Quantum Capital Management, LLC / NJ RIA/Wealth	John J. Hughes President	5.45% $49.7M	0.10% 77.8K shares	Q2 2022 Held for 3y 5m	$912.1M
AMERICAN CAPITAL MANAGEMENT INC Long Only Manager	David Mark La Valle CEO	4.69% $117.7M	0.23% 184.3K shares	≤ Q2 2013 Held for 12y 5m+	$2.5B

Hedge Fund Spotlight

Discover hedge funds investing in IDXX

Lombard Odier Asset Management Corp

Hedge Fund • Multi-Strategy

Portfolio ManagerRaymond Mouhadeb

Portfolio Value: $380.2M
Positions: 335
Last Reported: Q3 2025

Sector Allocation

Position in Idexx Laboratories

Market Value: $295.8K
Shares Held: 463.0
Portfolio Weight: 0.08%
Owned Since: 2025-Q3

Top Holding	Sector	Market Value	Weight
1 SLN Silence Therapeutics SLN	Unknown Unknown	$7.1M	1.87%
2 Republic Services RSG	Waste Management Industrials	$7.0M	1.84%
3 Verizon Communications VZ	Telecommunications Services Communication Services	$5.0M	1.32%

View full profile

Idexx Laboratories

Overview

All Institutions

Hedge Funds

Ownership Breakdown

Biggest Investors

Net Capital Flow

Biggest Buyers

Biggest Sellers

Entry and Exit Activity

New Positions

Exited Positions

Options Activity

Call Positions

Put Positions

Most Committed Institutions

Hedge Fund Spotlight

Position in Idexx Laboratories

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