Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in OSIS held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 2.5M | $671.6M | -1.3% | 15.347% | 0.01% |
| 2 | FMR LLC | 2.0M | $522.3M | +18.7% | 11.934% | 0.03% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.2M | $331.8M | — | 7.582% | 0.02% |
| 4 | JANUS HENDERSON GROUP PLC | 772K | $205.1M | +2.6% | 4.686% | 0.10% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 699K | $185.7M | — | 4.242% | 0.00% |
| 6 | Mawer Investment Management Ltd. | 663K | $175.9M | -17.5% | 4.020% | 1.14% |
| 7 | STATE STREET CORP | 662K | $175.8M | +0.6% | 4.017% | 0.01% |
| 8 | Capital International Investors | 619K | $164.5M | -8.1% | 3.758% | 0.04% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 441K | $117.0M | +7.2% | 2.674% | 0.01% |
| 10 | UBS ASSET MANAGEMENT AMERICAS INC | 431K | $114.3M | -13.6% | 2.612% | 0.02% |
| 11 | DIMENSIONAL FUND ADVISORS LP | 395K | $105.0M | -2.8% | 2.399% | 0.02% |
| 12 | Invesco Ltd. | 373K | $99.1M | -12.2% | 2.265% | 0.02% |
| 13 | Hood River Capital Management LLC | 372K | $98.8M | -1.9% | 2.257% | 0.99% |
| 14 | Neuberger Berman Group LLC | 304K | $80.7M | +1.0% | 1.844% | 0.06% |
| 15 | Clark Capital Management Group, Inc. | 270K | $71.8M | +1.6% | 1.641% | 0.44% |
| 16 | Channing Capital Management, LLC | 267K | $70.9M | — | 1.619% | 1.81% |
| 17 | BANK OF AMERICA CORP /DE/ | 266K | $70.7M | -6.9% | 1.616% | 0.01% |
| 18 | PRIMECAP MANAGEMENT CO/CA/ | 245K | $65.0M | -8.6% | 1.484% | 0.05% |
| 19 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 232K | $61.6M | +42.5% | 1.410% | 0.08% |
| 20 | SYSTEMATIC FINANCIAL MANAGEMENT LP | 219K | $58.2M | -6.0% | 1.330% | 1.33% |
| 21 | MORGAN STANLEY | 210K | $55.9M | -5.6% | 1.276% | 0.00% |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 201K | $53.4M | -0.5% | 1.219% | 0.01% |
| 23 | LOOMIS SAYLES & CO L P | 191K | $50.8M | -7.7% | 1.162% | 0.07% |
| 24 | NEUMEIER POMA INVESTMENT COUNSEL LLC | 191K | $50.8M | -2.2% | 1.161% | 4.19% |
| 25 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 172K | $45.6M | -10.3% | 1.042% | 0.15% |
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 OSIS — a direct measure of their conviction.
Filings activity in OSIS during Q1 2026, grouped by how each filer changed its position.
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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 362 | +2.3% | 129.28% | +4.72 pp | $4.81B | +3.8% |
| Q4 2025 | 354 | +4.1% | 124.56% | +3.20 pp | $4.63B | +2.6% |
| Q3 2025 | 340 | +3.3% | 121.36% | +11.22 pp | $4.51B | +10% |
| Q2 2025 | 329 | +8.9% | 110.14% | +11.65 pp | $4.09B | +12% |
| Q1 2025 | 302 | +1.0% | 98.49% | +18.49 pp | $3.66B | +23% |
| Q4 2024 | 299 | +12% | 80.00% | +15.21 pp | $2.97B | +23% |
| Q3 2024 | 268 | +3.5% | 64.79% | +9.20 pp | $2.41B | +17% |
| Q2 2024 | 259 | — | 55.59% | — | $2.07B | — |
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 OSIS stock.
Based on Q1 2026 13F filings, institutional ownership of OSI Systems, Inc. stands at 129.3%, held across 362 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OSIS, with approximately 2,529,623 shares worth $0.67B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of OSIS.
Our composite Smart Money Score for OSIS is 48 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
53 institutions opened new positions in OSIS during Q1 2026, while 45 fully exited. 197 added to existing positions and 108 trimmed.
OSIS institutional ownership rose by 4.72 percentage points quarter-over-quarter, with a net change of +8 holders.
The top 10 institutions account for 55.4% of all reported 13F value in OSIS, and the top 25 account for 77.0%.
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.
OSI Systems, Inc. (OSIS) Institutional Ownership