Whale Analyzer
IDXX Institutional Holders and 13F Ownership
Compare 10 tracked holders of IDXX, their reported positions and disclosed changes. Coverage is limited to the investors tracked by Whale Analyzer; these records do not establish all shareholders or current trades. Available original SEC filings for tracked 13F holders are linked below. Top tracked holders include Fundsmith Equity Fund, Capital Research Global Investors, Polen Capital Management, and Baillie Gifford & Co.
Continue to the live IDXX dashboardTop holders
| Investor | Reported value | Shares | Change | Report date |
|---|---|---|---|---|
| Fundsmith Equity Fund 13F holdings | $536.9M | 1.0M | Reduced | 2026-06-30 |
| Capital Research Global Investors 13F holdings | $415.5M | 789.1K | Increased | 2026-06-30 |
| Polen Capital Management 13F holdings | $280.3M | 532.4K | Reduced | 2026-06-30 |
| Baillie Gifford & Co 13F holdings | $186.3M | 353.8K | New | 2026-06-30 |
| National Pension Service 13F holdings | $68.1M | 129.3K | Increased | 2026-06-30 |
| Jensen Investment Management 13F holdings | $55.6M | 105.7K | Increased | 2026-06-30 |
| Weitz Investment Management 13F holdings | $18.6M | 35.3K | Held | 2026-06-30 |
| Bridgewater Associates 13F holdings | $17.7M | 33.5K | Increased | 2026-06-30 |
| Mairs & Power Funds 13F holdings | $1.1M | 2.1K | Held | 2026-06-30 |
| Oakmark Funds 13F holdings | $239.5K | 455 | Reduced | 2026-06-30 |
Original SEC filing sources
These recorded filings support the tracked 13F rows included in the aggregate reported values on this page. See each holder profile for source coverage and context for other disclosure types.
- Fundsmith Equity Fund SEC filing (0001569205-26-000012) · report date 2026-06-30
- Capital Research Global Investors SEC filing (0001422848-26-000094) · report date 2026-06-30
- Polen Capital Management SEC filing (0001172661-26-003035) · report date 2026-06-30
- Baillie Gifford & Co SEC filing (0001088875-26-000057) · report date 2026-06-30
- National Pension Service SEC filing (0001193125-26-347818) · report date 2026-06-30
- Jensen Investment Management SEC filing (0001171200-26-000010) · report date 2026-06-30
- Weitz Investment Management SEC filing (0001821268-26-000133) · report date 2026-06-30
- Bridgewater Associates SEC filing (0001350694-26-000003) · report date 2026-06-30
- Mairs & Power Funds SEC filing (0001172661-26-003496) · report date 2026-06-30
- Oakmark Funds SEC filing (0000813917-26-000042) · report date 2026-06-30
Tracked-sample concentration
Reported position value for IDXX is highly concentrated within this tracked-holder sample. These percentages are not market-wide ownership shares.
- Largest tracked holder: 34.0% of aggregate reported value in this sample
- Top 5 tracked holders: 94.1% of aggregate reported value in this sample
- Top 10 tracked holders: 100.0% of aggregate reported value in this sample
Whale activity this quarter
Across 10 tracked holders, 5 increased, 3 reduced, 2 held. Net positioning is net buying.
- Fundsmith Equity Fund ($536.9M) (▼ 30.4% qoq shares)
- Capital Research Global Investors ($415.5M) (▲ 1.0% qoq shares) · modeled avg cost estimate $427.58
- Polen Capital Management ($280.3M) (▼ 23.5% qoq shares) · modeled avg cost estimate $141.69
- Baillie Gifford & Co ($186.3M) · modeled avg cost estimate $506.05
- National Pension Service ($68.1M) (▲ 5.6% qoq shares) · modeled avg cost estimate $151.22
- Jensen Investment Management ($55.6M) (▲ 2861.0% qoq shares)
- Weitz Investment Management ($18.6M) (→ 0.0% qoq shares)
- Bridgewater Associates ($17.7M) (▲ 225.1% qoq shares) · modeled avg cost estimate $406.00
Modeled cost estimate vs current price
The share-weighted modeled cost estimate across 5 covered tracked holders is $340.04 versus a current price of $676.04, so IDXX trades above that estimate (+98.8%). This model does not establish any filer's actual purchase price, unrealized gain, or investment return.
Sector positioning — Health Care
IDXX sits within the Health Care sector alongside 253 other tracked names. Compare reported positions across tracked peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time or market-wide ownership totals. Open the live IDXX dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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- V whale holders — VISA INC
- UBER whale holders — UBER TECHNOLOGIES INC
- MA whale holders — MASTERCARD INCORPORATED
- GOOGL whale holders — ALPHABET INC
- CHD whale holders — CHURCH & DWIGHT CO INC
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 10 public-disclosure holders of IDXX with a combined reported value of $1.58B. See the holder table above for the largest tracked positions.
Which top funds are buying IDXX?
Tracked holders were net buying last quarter — 5 increased, 3 reduced, 2 held. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is the tracked IDXX sample?
The top five tracked holders account for 94.1% of aggregate reported value in this tracked sample. This is not a market-wide ownership percentage.
How does IDXX compare with the modeled cost estimate?
The share-weighted modeled cost estimate across 5 covered tracked holders is $340.04 versus a current price of $676.04 (+98.8%). It is not an actual purchase price, unrealized gain, or investment return.
What does 13F ownership mean for IDXX?
These are historical reported positions from tracked filers, not real-time ownership or a complete shareholder register. Use the interactive IDXX dashboard to explore them, or read our 13F Alpha Signals Guide.