Ranked by reported Q2 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. | 2.6M | $558.1M | +0.9% | 15.483% | 0.01% |
| 2 | FMR LLC | 1.7M | $380.1M | -11.6% | 10.545% | 0.02% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.3M | $278.2M | +1.8% | 7.717% | 0.01% |
| 4 | Jupiter Topco LLC | 906K | $198.1M | — | 5.496% | 0.08% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 703K | $153.8M | +0.5% | 4.265% | 0.00% |
| 6 | STATE STREET CORP | 674K | $147.4M | +1.8% | 4.089% | 0.00% |
| 7 | Capital International Investors | 596K | $130.4M | -3.7% | 3.618% | 0.03% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 464K | $101.4M | +5.2% | 2.814% | 0.01% |
| 9 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME | 453K | $99.0M | +5.1% | 2.746% | 0.02% |
| 10 | Channing Capital Management, LLC | 433K | $94.7M | +62.2% | 2.626% | 2.18% |
| 11 | Hood River Capital Management LLC | 414K | $90.6M | +11.3% | 2.514% | 0.66% |
| 12 | DIMENSIONAL FUND ADVISORS LP | 414K | $90.5M | +4.7% | 2.512% | 0.02% |
| 13 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 379K | $83.0M | +121.0% | 2.301% | 0.25% |
| 14 | Neuberger Berman Group LLC | 325K | $70.9M | +6.8% | 1.970% | 0.02% |
| 15 | MILLENNIUM MANAGEMENT LLC | 298K | $65.3M | +584.4% | 1.811% | 0.02% |
| 16 | Invesco Ltd. | 263K | $57.6M | -29.5% | 1.597% | 0.00% |
| 17 | PRIMECAP MANAGEMENT CO/CA/ | 258K | $56.5M | +5.5% | 1.566% | 0.03% |
| 18 | AMERICAN CENTURY COMPANIES INC | 223K | $48.8M | +337.6% | 1.354% | 0.02% |
| 19 | NEUMEIER POMA INVESTMENT COUNSEL LLC | 223K | $48.7M | +16.2% | 1.350% | 3.33% |
| 20 | Clark Capital Management Group, Inc. | 219K | $47.9M | -19.1% | 1.328% | 0.26% |
| 21 | SYSTEMATIC FINANCIAL MANAGEMENT LP | 216K | $47.3M | -1.4% | 1.311% | 0.94% |
| 22 | UBS Group AG | 211K | $46.1M | +55.1% | 1.279% | 0.01% |
| 23 | VAN ECK ASSOCIATES CORP | 200K | $43.7M | +6.1% | 1.211% | 0.03% |
| 24 | MORGAN STANLEY | 198K | $43.3M | -5.9% | 1.201% | 0.00% |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 194K | $42.4M | -3.6% | 1.176% | 0.01% |
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 Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new OSIS position in Q2 2026
Institutions that fully closed their OSIS 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 | 366 | 1.9% | 115.56% | +0.01 pp | $4.04B | 17% |
| Q1 2026 | 373 | +4.8% | 115.55% | +0.76 pp | $4.89B | +5.3% |
| Q4 2025 | 356 | +4.1% | 114.79% | +4.21 pp | $4.65B | +2.7% |
| Q3 2025 | 342 | +4.0% | 110.58% | 1.88 pp | $4.52B | +10% |
| Q2 2025 | 329 | +8.9% | 112.46% | 4.73 pp | $4.09B | +12% |
| Q1 2025 | 302 | +1.0% | 117.19% | +8.56 pp | $3.66B | +23% |
| Q4 2024 | 299 | +12% | 108.63% | +10.31 pp | $2.97B | +23% |
| Q3 2024 | 268 | — | 98.32% | — | $2.41B | — |
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 Q2 2026 13F filings, institutional ownership of OSI Systems, Inc. stands at 115.6%, held across 366 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of OSIS, with approximately 2,552,027 shares worth $0.56B as of Q2 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of OSIS, including MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for OSIS is 44 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 Q2 2026, while 58 fully exited. 57 added to existing positions and 245 trimmed.
OSIS institutional ownership rose by 0.01 percentage points quarter-over-quarter, with a net change of -7 holders.
The top 10 institutions account for 52.9% of all reported 13F value in OSIS, and the top 25 account for 74.8%.
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