Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in IDXX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 8.2M | $4.30B | -2.3% | 10.357% | 0.06% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 5.2M | $2.71B | -0.6% | 6.531% | 0.06% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.9M | $2.05B | -0.4% | 4.940% | 0.09% |
| 4 | STATE STREET CORP | 3.7M | $1.97B | +2.0% | 4.752% | 0.03% |
| 5 | Invesco Ltd. | 3.6M | $1.90B | +116.1% | 4.578% | 0.15% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 2.6M | $1.35B | -3.7% | 3.249% | 0.07% |
| 7 | BAMCO INC /NY/ | 2.0M | $1.04B | +21.0% | 2.506% | 1.56% |
| 8 | MORGAN STANLEY | 1.4M | $713.9M | +3.0% | 1.719% | 0.04% |
| 9 | Bank of New York Mellon Corp | 1.2M | $628.2M | -20.7% | 1.513% | 0.10% |
| 10 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.1M | $561.8M | +27.2% | 1.353% | 0.25% |
| 11 | Fundsmith LLP | 1.0M | $536.9M | -30.4% | 1.293% | 3.93% |
| 12 | BLAIR WILLIAM & CO/IL | 919K | $483.6M | -2.9% | 1.165% | 1.26% |
| 13 | NORTHERN TRUST CORP | 918K | $483.3M | +0.7% | 1.164% | 0.06% |
| 14 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME | 911K | $479.8M | +4.5% | 1.155% | 0.09% |
| 15 | FMR LLC | 823K | $433.1M | +190.7% | 1.043% | 0.02% |
| 16 | AMERICAN CENTURY COMPANIES INC | 808K | $425.6M | +34.7% | 1.025% | 0.19% |
| 17 | Capital Research Global Investors | 789K | $415.5M | +1.0% | 1.000% | 0.06% |
| 18 | JPMORGAN CHASE & CO | 756K | $405.1M | -3.1% | 0.958% | 0.02% |
| 19 | PRINCIPAL FINANCIAL GROUP INC | 743K | $391.3M | -15.7% | 0.942% | 0.19% |
| 20 | GOLDMAN SACHS GROUP INC | 739K | $388.9M | +3.0% | 0.936% | 0.03% |
| 21 | WELLINGTON MANAGEMENT GROUP LLP | 727K | $382.6M | -1.2% | 0.921% | 0.07% |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 650K | $342.4M | +6.6% | 0.825% | 0.05% |
| 23 | Legal & General Group Plc | 617K | $324.9M | -5.2% | 0.782% | 0.07% |
| 24 | DIMENSIONAL FUND ADVISORS LP | 609K | $320.6M | +6.2% | 0.772% | 0.06% |
| 25 | FRANKLIN RESOURCES INC | 576K | $303.1M | -13.1% | 0.730% | 0.07% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in IDXX — a direct measure of their conviction.
Filings activity in IDXX during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new IDXX position in Q2 2026
Institutions that fully closed their IDXX position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,288 | 0.7% | 93.57% | +3.83 pp | $37.88B | 2.1% |
| Q1 2026 | 1,297 | 4.1% | 89.74% | 12.75 pp | $38.69B | 17% |
| Q4 2025 | 1,352 | +7.4% | 102.49% | +12.44 pp | $46.76B | +5.1% |
| Q3 2025 | 1,259 | +4.8% | 90.05% | 2.00 pp | $44.47B | +17% |
| Q2 2025 | 1,201 | +9.8% | 92.05% | +0.55 pp | $38.09B | +30% |
| Q1 2025 | 1,094 | +1.4% | 91.50% | +3.93 pp | $29.19B | 2.7% |
| Q4 2024 | 1,079 | +0.9% | 87.57% | +0.01 pp | $30.00B | 13% |
| Q3 2024 | 1,069 | — | 87.56% | — | $34.35B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IDXX stock.
Based on Q2 2026 13F filings, institutional ownership of IDEXX Laboratories, Inc. stands at 93.6%, held across 1,288 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of IDXX, with approximately 8,170,178 shares worth $4.30B as of Q2 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of IDXX.
Our composite Smart Money Score for IDXX is 42 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
97 institutions opened new positions in IDXX during Q2 2026, while 108 fully exited. 295 added to existing positions and 855 trimmed.
IDXX institutional ownership rose by 3.83 percentage points quarter-over-quarter, with a net change of -9 holders.
The top 10 institutions account for 45.5% of all reported 13F value in IDXX, and the top 25 account for 61.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
IDEXX Laboratories, Inc. (IDXX) Institutional Ownership