Who owns IDXX? 13F holders and whale ownership
IDXX is tracked across public portfolios in Whale Analyzer. This page answers who owns IDXX, which top funds are buying IDXX, aggregate disclosed value, and recent position changes based on public data. Terry Smith is the largest reported holder at $824M; the top five funds control 100.0% of reported ownership; institutions were net selling last quarter (0 increased, 2 reduced); the stock trades above the aggregate whale cost basis of $244.45. Top tracked holders include Terry Smith and Polen Capital.
Continue to the live IDXX dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Terry Smith 13F portfolio Fundsmith Equity Fund holdings | $823.6M | 1.5M | Reduced |
| Polen Capital 13F portfolio Polen Capital Management holdings | $391.0M | 695.8K | Reduced |
Ownership concentration
Reported ownership of IDXX is highly concentrated across tracked institutions.
- Single largest holder: 67.8% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 2 tracked institutions, 2 reduced. Net positioning is net selling.
- Terry Smith — Fundsmith Equity Fund ($823.6M) (▼ 21.9% qoq shares)
- Polen Capital — Polen Capital Management ($391.0M) (▼ 27.6% qoq shares) · avg cost $244.45
Whale cost basis vs current price
The aggregate tracked cost basis is $244.45 versus a current price of $551.50, so IDXX trades above its cost basis (+125.6%). Average unrealized P&L across tracked holders: 126%.
Sector positioning — Health Care
IDXX sits within the Health Care sector alongside 221 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live IDXX dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
Related stock holder pages
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- V whale holders — VISA INC
- GOOGL whale holders — ALPHABET INC
- PM whale holders — PHILIP MORRIS INTL INC
- ADP whale holders — AUTOMATIC DATA PROCESSING IN
- MSFT whale holders — MICROSOFT CORP
Learn more in Whale Analyzer Academy
Deepen your read on IDXX with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns IDXX stock?
Whale Analyzer tracks 2 public institutional holders of IDXX with a combined reported value of $1.21B. See the holder table above for the largest tracked positions.
Which top funds are buying IDXX?
Tracked institutions were net selling last quarter — 2 reduced. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is IDXX ownership?
The top five tracked holders report 100.0% of aggregate ownership.
Is IDXX above or below the whale cost basis?
The aggregate tracked cost basis is $244.45 versus a current price of $551.50 (+125.6%).
What does 13F ownership mean for IDXX?
Use the interactive IDXX dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.