Comparable stake leader
BlackRock, Inc.
SEC ownership of IDEXX LABORATORIES INC /DE
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000874716.
Disclosed value leader
VANGUARD CAPITAL MANAGEMENT LLC
Comparable rows
3/50
Latest evidence
30 Sep 2026
- Public ticker
- IDXX on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
3 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000874716
- Issuer location
- Westbrook, ME
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of IDEXX LABORATORIES INC /DE (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
VANGUARD CAPITAL MANAGEME...
Comparable rows
3/50
Latest evidence
30 Sep 2026
13D/G
13F
3/4/5
Lead comparable stake: 9.4%
47 rows are not safely comparable across share classes.
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 9.4%.
3 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 3
BlackRock, Inc.
9.4%
VANGUARD CAPITAL MANAGEMENT LLC
7.5%
VANGUARD PORTFOLIO MANAGEMENT LLC
5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
|
9.4%
Reported 13D/G
· 31 Mar 2025
|
$3,297,923,861
7,599,078 shares
|
$0 | 31 Mar 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
7.5%
Reported 13D/G
· 31 Mar 2026
|
$3,358,119,852
5,976,472 shares
|
$0 | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5%
Reported 13D/G
· 30 Sep 2026
|
$2,075,429,534
3,974,472 shares
|
$0 | 30 Sep 2026 |
| STATE STREET CORP |
13F
Company
|
—
denominator unverified
|
$1,964,145,623
3,761,362 shares
|
— | 30 Sep 2026 |
| Invesco Ltd. |
13F
Company
|
—
denominator unverified
|
$1,761,692,874
3,373,663 shares
|
— | 30 Sep 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
—
denominator unverified
|
$1,365,439,733
2,620,703 shares
|
— | 30 Sep 2026 |
| MORGAN STANLEY |
13F
Company
|
—
denominator unverified
|
$717,670,890
1,374,345 shares
|
— | 30 Sep 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP |
13F
Company
|
—
denominator unverified
|
$709,881,274
1,359,431 shares
|
— | 30 Sep 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$58,430,077.
Buys
$0
Insiders: 0
Sells
$58,430,077
Insiders: 9
Net
-$58,430,077
Shares: -87,385
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 87,385
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 41,428 | $0 | $28,567,935 | -$28,567,935 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 34,612 | $0 | $22,525,148 | -$22,525,148 |
| 9-12 | 0 | 11,345 | $0 | $7,336,993 | -$7,336,993 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 26 reporting-owner rows connected to IDEXX LABORATORIES INC /DE. Open a relationship link for the CIK-to-CIK filing trail.
Rows
26
Largest Forms 3/4/5 holder
Jonathan W. Ayers
Net 12M change
-$58.43M
Full value: -$58,430,076 · USD · 12-month changeLatest report
10 Nov 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jonathan W. Ayers | Director | $271,217,396 | Mixed | 06 Sep 2024 | ||
| Jonathan Jay Mazelsky | Executive Chair of the Board, Director | $60,640,628 | -$33,016,275 | -35% | Mixed | 04 Nov 2026 |
| Brian P. McKeon | EVP, CFO and Treasurer | $22,445,917 | Mixed | 14 Feb 2025 | ||
| Nimrata Hunt | Executive Vice President | $12,016,938 | -$2,897,108 | -19% | Mixed | 03 Mar 2026 |
| Giovani Twigge | Senior Vice President | $10,643,626 | Mixed | 23 Feb 2022 | ||
| Michael G. Erickson | Executive Vice President | $9,852,129 | -$3,369,666 | -25% | Mixed | 17 Feb 2026 |
| George Fennell | Executive Vice President | $6,546,687 | -$7,336,993 | -53% | Mixed | 10 Nov 2026 |
| James F. Polewaczyk | Executive Vice President | $6,361,104 | Mixed | 06 Mar 2024 | ||
| Sharon E. Underberg | EVP, GC & Corporate Secretary | $5,236,364 | -$6,132,605 | -54% | Mixed | 04 Nov 2026 |
| Sophie Vandebroek V | Director | $5,100,836 | -$920,293 | -15% | Mixed | 12 May 2026 |
| Lawrence D. Kingsley | Director | $5,090,966 | -$1,172,178 | -19% | Filing P/S | 04 Sep 2026 |
| Kathy Turner V | Senior Vice President | $4,360,647 | Mixed | 15 Feb 2023 | ||
| Michael Lane | Executive Vice President | $3,512,628 | -$2,740,069 | -44% | Mixed | 04 Nov 2026 |
| Michael Schreck | Executive Vice President | $2,345,290 | Mixed | 12 Feb 2026 | ||
| Andrew Emerson | EVP, CFO and Treasurer | $2,327,624 | Mixed | 20 Aug 2026 | ||
| Michael P. Johnson | Executive Vice President | $1,996,660 | Mixed | 12 Feb 2026 | ||
| Martin A. Smith | Executive Vice President | $1,758,704 | Mixed | 12 Feb 2026 | ||
| Daniel M. Junius | Director | $1,656,678 | -$844,889 | -34% | Filing P/S | 04 Nov 2026 |
| Bruce L. Claflin | Director | $1,413,420 | Mixed | 12 May 2026 | ||
| SZOSTAK M ANNE | Director | $1,303,583 | Mixed | 07 May 2026 |
Recent insider transactions for IDEXX LABORATORIES INC /DE
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| George Fennell | IDXX | Common Stock | Options Exercise | 16.8% | 1,749 | 12,182 | 10 Nov 2026 | Direct | ||
| George Fennell | IDXX | Incentive Stock Option (right-to-buy) | Options Exercise | -100% | -1,749 | 0 | 10 Nov 2026 | Direct | ||
| Sharon E. Underberg | IDXX | Common Stock | Sale | -55.4% | -$6,132,605 | $688.59 | -8,906 | 7,169 | 04 Nov 2026 | Direct |
| Sharon E. Underberg | IDXX | Common Stock | Options Exercise | 124.2% | 8,906 | 16,075 | 04 Nov 2026 | Direct | ||
| Sharon E. Underberg | IDXX | Non-Qualified Stock Option (right-to-buy) | Options Exercise | -100% | -8,906 | 0 | 04 Nov 2026 | Direct | ||
| Jonathan Jay Mazelsky | IDXX | Common Stock | Sale | -23.1% | -$17,678,195 | $703.19 | -25,140 | 83,803 | 04 Nov 2026 | Direct |
| Jonathan Jay Mazelsky | IDXX | Common Stock | Options Exercise | 30% | 25,140 | 108,943 | 04 Nov 2026 | Direct | ||
| Jonathan Jay Mazelsky | IDXX | Non-Qualified Stock Option (right-to-buy) | Options Exercise | -100% | -25,140 | 0 | 04 Nov 2026 | Direct | ||
| Michael Lane | IDXX | Common Stock | Sale | -49.4% | -$2,740,069 | $688.64 | -3,979 | 4,076 | 04 Nov 2026 | Direct |
| Daniel M. Junius | IDXX | Common Stock | Sale | -33.7% | -$844,888 | $704.07 | -1,200 | 2,361 | 04 Nov 2026 | Direct |
| Joseph L. Hooley | IDXX | Common Stock | Award | 14.8% | 48 | 373 | 30 Oct 2026 | Direct | ||
| Lawrence D. Kingsley | IDXX | Common Stock | Sale | -18.7% | -$1,172,178 | $532.08 | -2,203 | 9,568 | 04 Sep 2026 | Direct |
| Lawrence D. Kingsley | IDXX | Common Stock | Options Exercise | 23% | 2,203 | 11,771 | 04 Sep 2026 | Direct | ||
| Lawrence D. Kingsley | IDXX | Non-Qualified Stock Option (right-to-buy) | Options Exercise | -100% | -2,203 | 0 | 04 Sep 2026 | Direct | ||
| Andrew Emerson | IDXX | Common Stock | Tax liability | -1.91% | -86 | 4,421 | 20 Aug 2026 | Direct | ||
| Andrew Emerson | IDXX | Common Stock | Options Exercise | 6.25% | 265 | 4,507 | 20 Aug 2026 | Direct | ||
| Andrew Emerson | IDXX | Incentive Stock Option (right-to-buy) | Options Exercise | -22.3% | -265 | 925 | 20 Aug 2026 | Direct | ||
| Joseph L. Hooley | IDXX | Common Stock | Award | 17.8% | 49 | 325 | 30 Jul 2026 | Direct | ||
| George Fennell | IDXX | Common Stock | Tax liability | -2.65% | -284 | 10,433 | 01 Jun 2026 | Direct | ||
| George Fennell | IDXX | Common Stock | Options Exercise | 6.34% | 639 | 10,717 | 01 Jun 2026 | Direct | ||
| George Fennell | IDXX | Restricted Stock Unit | Options Exercise | -100% | -639 | 0 | 01 Jun 2026 | Direct | ||
| Sophie Vandebroek V | IDXX | Restricted Stock Unit | Award | 234 | 234 | 12 May 2026 | Direct | |||
| Sophie Vandebroek V | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Sam Samad | IDXX | Deferred Stock Unit | Award | 20.9% | 234 | 1,354 | 12 May 2026 | Direct | ||
| Sam Samad | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Karen Peacock | IDXX | Deferred Stock Unit | Award | 234 | 234 | 12 May 2026 | Direct | |||
| Karen Peacock | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Lawrence D. Kingsley | IDXX | Restricted Stock Unit | Award | 309 | 234 | 12 May 2026 | Direct | |||
| Lawrence D. Kingsley | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 693 | 525 | 12 May 2026 | Direct | |||
| Daniel M. Junius | IDXX | Restricted Stock Unit | Award | 234 | 234 | 12 May 2026 | Direct | |||
| Daniel M. Junius | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Joseph L. Hooley | IDXX | Deferred Stock Unit | Award | 234 | 234 | 12 May 2026 | Direct | |||
| Joseph L. Hooley | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Stuart Essig | IDXX | Restricted Stock Unit | Award | 234 | 234 | 12 May 2026 | Direct | |||
| Stuart Essig | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Bruce L. Claflin | IDXX | Deferred Stock Unit | Award | 20.9% | 234 | 1,354 | 12 May 2026 | Direct | ||
| Bruce L. Claflin | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Irene Chang Britt | IDXX | Deferred Stock Unit | Award | 45.1% | 234 | 753 | 12 May 2026 | Direct | ||
| Irene Chang Britt | IDXX | Non-Qualified Stock Option (right-to-buy) | Award | 525 | 525 | 12 May 2026 | Direct | |||
| Sophie Vandebroek V | IDXX | Common Stock | Options Exercise | 39.7% | 257 | 905 | 07 May 2026 | Direct | ||
| Sophie Vandebroek V | IDXX | Restricted Stock Unit | Options Exercise | -100% | -257 | 0 | 07 May 2026 | Direct | ||
| Szostak M Anne | IDXX | Common Stock | Options Exercise | 98.1% | 257 | 519 | 07 May 2026 | Direct | ||
| Szostak M Anne | IDXX | Restricted Stock Unit | Options Exercise | -100% | -257 | 0 | 07 May 2026 | Direct | ||
| Karen Peacock | IDXX | Common Stock | Options Exercise | 10100% | 101 | 102 | 07 May 2026 | Direct | ||
| Karen Peacock | IDXX | Restricted Stock Unit | Options Exercise | -100% | -101 | 0 | 07 May 2026 | Direct | ||
| Lawrence D. Kingsley | IDXX | Common Stock | Options Exercise | 3.67% | 339 | 9,568 | 07 May 2026 | Direct | ||
| Lawrence D. Kingsley | IDXX | Restricted Stock Unit | Options Exercise | -100% | -339 | 0 | 07 May 2026 | Direct | ||
| Daniel M. Junius | IDXX | Common Stock | Options Exercise | 7.78% | 257 | 3,561 | 07 May 2026 | Direct | ||
| Daniel M. Junius | IDXX | Restricted Stock Unit | Options Exercise | -100% | -257 | 0 | 07 May 2026 | Direct | ||
| Joseph L. Hooley | IDXX | Common Stock | Options Exercise | 133.9% | 158 | 276 | 07 May 2026 | Direct |
* marks a reported price that did not pass the local price check.