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Of the 19 tracked institutions holding IDXX, 12 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +2.3pt. It's a gauge of who owns the name, not just how many.
Among the 19 tracked institutional investors we monitor, IDXX (IDEXX LABS INC) is held with a combined value of $15.58B across 26,755,607 shares. The largest holder is VANGUARD GROUP INC with a position worth $6.73B (0.10% of their portfolio). BAILLIE GIFFORD & CO opened a new position in the most recent quarter. 8 funds increased their holdings. 10 funds reduced their position.
Total Institutional Value
$15.58B
Total Shares Held
26,755,607
Institutional Holders
19
% of Shares Outstanding
34.0%
of 78.78M shares · SEC 2026-07-31
Days to Cover
2.6+0.6%
1.94M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 34.0% of IDXX's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-31), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $6.73B | 0.10% | -0.2% |
| 2 | BlackRock, Inc. | $4.30B | 0.06% | -2.3% |
| 3 | STATE STREET CORP | $1.97B | 0.06% | +2.0% |
| 4 | Fundsmith LLP | $536.91M | 3.93% | -30.4% |
| 5 | FMR LLC | $433.07M | 0.02% | +190.7% |
| 6 | Capital Research Global Investors | $415.47M | 0.06% | +1.0% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | $382.56M | 0.07% | -1.2% |
| 8 | PRICE T ROWE ASSOCIATES INC /MD/ | $241.28M | 0.02% | -28.2% |
| 9 | BAILLIE GIFFORD & CO | $186.25M | 0.17% | New |
| 10 | Point72 Asset Management, L.P. | $138.40M | 0.21% | +103.4% |
| Member | Type | Date |
|---|---|---|
| April McClain Delaney | Sell | Jan 13, 2026 |
| April McClain Delaney | Sell | Oct 16, 2025 |
| Byron Donalds | Buy | Sep 4, 2025 |
| April McClain Delaney | Sell |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of IDXX with a position worth $6.73B, representing 0.10% of their portfolio. In total, 19 institutional investors hold IDXX with a combined value of $15.58B.
In the most recent quarter, 1 fund opened a new position in IDXX. Additionally, 8 increased their holdings and 10 reduced their positions.
Institutional investors hold $15.58B worth of IDXX stock across 19 positions. The largest institutional holder is VANGUARD GROUP INC with $6.73B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For IDXX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their IDXX positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Aug 7, 2025 |
| April McClain Delaney | Sell | Jul 9, 2025 |
| Rob Bresnahan | Buy | May 15, 2025 |
| Jefferson Shreve | Sell | May 12, 2025 |
| April McClain Delaney | Buy | Apr 9, 2025 |
Showing 8 of 15. STOCK Act disclosures lag up to 45 days.
Last Close
$520.21
2026-09-08
YTD
-22.4%
0% of 52-week range
