WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in IDXX — Idexx Laboratories Inc /De
CIK 1644956
CHICAGO, IL
Position in IDXX
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$197,572,323
-$100,996,602 QoQ
Shares Held
351,621
-20.3% QoQ
Ownership
0.446%
of shares outstanding
% of Portfolio
0.66%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 88.95117185833611.ToString("F0")%
Shared 0.ToString("F0")%
None 11.048828141663893.ToString("F0")%
Common Shares in IDXX Over Time
Shares Held
Position Value (USD)
Position in Diagnostics & Research
Healthcare · as of Mar 31, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $822,825,452 across 8 Diagnostics & Research names. IDXX ranks #3 (24.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | TWST |
Twist Bioscience Corp
|
5,269,718 | $250,416,999 | |
| 2 | A |
Agilent Technologies, Inc.
|
1,795,764 | $204,681,180 | |
| 3 | IDXX |
Idexx Laboratories Inc /De
This page
|
351,621 | $197,572,323 | |
| 4 | GH |
Guardant Health, Inc.
|
951,114 | $87,854,400 | |
| 5 | WGS |
GeneDx Holdings Corp.
|
775,269 | $49,787,775 | |
| 6 | VCYT |
Veracyte, Inc.
|
989,687 | $31,877,818 | |
| 7 | LH |
Labcorp Holdings Inc.
|
1,311 | $349,787 | |
| 8 | ICLR |
Icon PLC
|
2,577 | $285,170 |
All Filings in IDXX
Export CSV
25 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $197,572,323 | 351,621 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $298,568,925 | 441,324 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $293,262,648 | 459,019 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $367,440,097 | 685,088 | Shares | Sole | 2025-07-29 | |
| 2025-03-31 | $267,554,764 | 637,111 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $174,526,667 | 422,133 | Shares | Sole | 2025-02-10 | |
| 2024-09-30 | $26,605,895 | 52,662 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $32,701,351 | 67,121 | Shares | Sole | 2024-08-08 | |
| 2024-03-31 | $37,270,288 | 69,028 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $37,926,011 | 68,329 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $29,356,121 | 67,135 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $37,687,841 | 75,041 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $37,666,025 | 75,320 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $31,698,084 | 77,699 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $35,071,066 | 107,646 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 | $38,791,439 | 110,602 | Shares | Sole | 2022-08-10 | |
| 2022-03-31 | $63,693,648 | 116,429 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $81,641,138 | 123,988 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $75,739,335 | 121,787 | Shares | Sole | 2021-11-10 | |
| 2021-06-30 | $77,795,592 | 123,182 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $46,600,905 | 95,238 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $54,706,272 | 109,441 | Shares | Sole | 2021-02-09 | |
| 2020-09-30 | $50,704,900 | 128,984 | Shares | Sole | 2020-11-06 | |
| 2020-06-30 | $47,604,119 | 144,185 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $40,429,856 | 166,900 | Shares | Sole | 2020-05-08 | |
| No filing history on record for this holder in this stock. | ||||||