OSI Systems, Inc. (OSIS) Ownership
OSIS ownership summary
as of October 18, 2026- Institutions
- 125.8% of shares outstanding
- Insiders
- 4.87% of shares outstanding
- Shares outstanding
- 15.9M
- Float
- 15.0M shares available to trade
- Short interest
- 16.26% 2.1M shares short
- Days to cover
- 8.96 short interest down 1.7% vs prior month
- Institutions 125.81%
- Insiders 4.87%
OSIS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 16.01% | 2.6M | $497.6M | +22,404 (+0.9%) | June 30, 2026 |
| 2 | FMR Inc | 10.90% | 1.7M | $338.9M | −228,922 (−11.6%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 7.98% | 1.3M | $248.0M | +22,268 (+1.8%) | June 30, 2026 |
| 4 | Jupiter Topco LLC | 5.68% | 906K | $176.6M | +905,925 (0.0%) | June 30, 2026 |
| 5 | HHG PLC | 4.84% | 772K | $150.6M | +19,747 (+2.6%) | March 31, 2026 |
| 6 | Vanguard Capital Management, LLC | 4.41% | 703K | $137.1M | +3,817 (+0.5%) | June 30, 2026 |
| 7 | State Street Corp | 4.23% | 674K | $131.4M | +11,912 (+1.8%) | June 30, 2026 |
| 8 | Capital Research & Mgmt Co - Division 3 | 3.74% | 596K | $116.3M | −23,148 (−3.7%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.91% | 464K | $90.4M | +23,064 (+5.2%) | June 30, 2026 |
| 10 | UBS Asset Mgmt Americas Inc | 2.84% | 453K | $88.2M | +21,986 (+5.1%) | June 30, 2026 |
| 11 | Channing Capital Management, LLC | 2.72% | 433K | $84.4M | +165,967 (+62.2%) | June 30, 2026 |
| 12 | Hood River Capital Management LLC | 2.60% | 414K | $80.8M | +42,230 (+11.3%) | June 30, 2026 |
| 13 | Dimensional Fund Advisors, Inc. | 2.60% | 414K | $80.7M | +18,606 (+4.7%) | June 30, 2026 |
| 14 | William Blair Investment Management, LLC | 2.38% | 379K | $74.0M | +207,684 (+121.0%) | June 30, 2026 |
| 15 | Neuberger Berman Group LLC | 2.04% | 325K | $63.3M | +20,792 (+6.8%) | June 30, 2026 |
| 16 | T. Rowe Price Associates, Inc. | 1.97% | 315K | $61.4M | +55,172 (+21.3%) | June 30, 2026 |
| 17 | Millennium Management LLC | 1.87% | 298K | $58.2M | +254,870 (+584.4%) | June 30, 2026 |
| 18 | Amvescap Plc. | 1.65% | 263K | $51.3M | −110,067 (−29.5%) | June 30, 2026 |
| 19 | PRIMECAP Management Company | 1.62% | 258K | $50.3M | +13,520 (+5.5%) | June 30, 2026 |
| 20 | American Century Companies Inc | 1.40% | 223K | $43.5M | +172,148 (+337.6%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 17 holders added 2.0M shares and 3 cut 362K.
OSIS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.79% | 923K | $179.9M | +210 (+0.0%) | September 30, 2026 |
| 2 | American Funds SMALLCAP World A | 3.64% | 580K | $113.1M | −39,342 (−6.4%) | June 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.12% | 498K | $97.0M | −680 (−0.1%) | August 31, 2026 |
| 4 | iShares Russell 2000 ETF | 2.60% | 415K | $80.8M | −4,800 (−1.1%) | September 30, 2026 |
| 5 | Janus Henderson Triton D | 2.59% | 412K | $80.4M | — | August 31, 2026 |
| 6 | Vanguard Information Technology ETF | 2.51% | 401K | $78.1M | −817 (−0.2%) | August 31, 2026 |
| 7 | Vanguard Small Cap Index | 2.26% | 360K | $70.2M | +419 (+0.1%) | August 31, 2026 |
| 8 | Hood River Small-Cap Growth Instl | 1.73% | 275K | $53.6M | +33,308 (+13.8%) | June 30, 2026 |
| 9 | Fidelity Small Cap Growth | 1.68% | 267K | $52.1M | −7,816 (−2.8%) | July 31, 2026 |
| 10 | Janus Henderson Venture D | 1.66% | 264K | $51.5M | +937 (+0.4%) | August 31, 2026 |
| 11 | Fidelity Small Cap Value Fund | 1.64% | 261K | $51.0M | +76,500 (+41.4%) | July 31, 2026 |
| 12 | Vanguard MStar Small Cap Value Index | 1.44% | 229K | $44.6M | +179 (+0.1%) | August 31, 2026 |
| 13 | VanEck Defense ETF A USD Acc | 1.16% | 185K | $36.0M | +157 (+0.1%) | September 30, 2026 |
| 14 | UBS Lux Sec Eq Fd CHF H P acc | 1.10% | 175K | $34.2M | −8,089 (−4.4%) | June 30, 2026 |
| 15 | Fidelity Small Cap Index | 1.10% | 175K | $34.2M | +1,416 (+0.8%) | July 31, 2026 |
| 16 | PRIMECAP Odyssey Aggressive Growth | 1.09% | 173K | $33.8M | +120 (+0.1%) | June 30, 2026 |
| 17 | Fidelity Stock Selector Small Cap | 0.97% | 154K | $30.0M | — | July 31, 2026 |
| 18 | iShares Russell 2000 Growth ETF | 0.94% | 150K | $29.2M | −190 (−0.1%) | September 30, 2026 |
| 19 | iShares S&P Small-Cap 600 Growth ETF | 0.90% | 144K | $28.0M | — | September 30, 2026 |
| 20 | State Street SPDR Port S&P 600 Sm CpETF | 0.88% | 141K | $27.4M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
OSIS insider transactions
latest 12| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-02 | Deepak Chopra | Sell | $250.91 | 20,000 | $5.0M |
| 2025-11-10 | Deepak Chopra | Sell | $285.74 | 20,000 | $5.7M |
| 2025-11-07 | James B Hawkins | Sell | $283.15 | 1,500 | $424,725 |
| 2025-11-07 | Paul Keith Morben | Sell | $279.10 | 416 | $116,106 |
| 2025-10-01 | Deepak Chopra | Sell | $245.80 | 20,000 | $4.9M |
| 2025-09-04 | Paul Keith Morben | Sell | $236.76 | 1,671 | $395,626 |
| 2025-06-12 | Meyer/ Luskin | Sell | $237.15 | 1,000 | $237,150 |
| 2025-05-21 | William Francis Ballhaus Jr | Sell | $228.88 | 750 | $171,660 |
| 2025-05-13 | Alan I Edrick | Sell | $229.00 | 20,000 | $4.6M |
| 2025-05-08 | Glenn Grindstaff | Sell | $224.89 | 688 | $154,724 |
| 2025-05-06 | William Francis Ballhaus Jr | Sell | $219.77 | 933 | $205,045 |
| 2025-05-05 | Deepak Chopra | Sell | $221.79 | 20,000 | $4.4M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
OSIS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns OSIS
Institutional investors own 125.8% of OSI Systems's shares and insiders 4.87%. The largest holder is BlackRock Inc with 16.01% of the shares (2.6M), as of June 30, 2026. Among the top 20 institutions, 17 added shares and 3 reduced their stake in the latest filings. Short interest is 16.26% of the float, or 8.96 days of average trading volume. The share count fell 14.7% since 2014.
Related: OSIS analyst forecast, OSIS key metrics. See the OSIS stock overview for the latest quote and news.
OSIS ownership FAQ
Who owns the most OSI Systems stock?
The largest shareholders of OSI Systems are BlackRock Inc (16.01%), FMR Inc (10.90%), Vanguard Portfolio Management, LLC (7.98%), Jupiter Topco LLC (5.68%), HHG PLC (4.84%).
What percentage of OSI Systems is owned by institutions?
Institutions hold 125.8% of OSI Systems's shares outstanding; insiders hold 4.87%.
Which funds own OSI Systems?
The largest fund holders of OSI Systems are iShares Core S&P Small-Cap ETF (5.79%), American Funds SMALLCAP World A (3.64%), Vanguard MStar Total Stk Mkt Idx Invest (3.12%), iShares Russell 2000 ETF (2.60%), Janus Henderson Triton D (2.59%).
What is OSI Systems's short interest?
2.1M shares of OSI Systems were sold short, 16.26% of the float; at the average daily volume it would take 8.96 days to cover.
Are insiders buying or selling OSI Systems?
Of the latest 12 reported insider transactions in OSI Systems (since May 5, 2025), 0 were purchases and 12 were sales.
How many shares of OSI Systems are outstanding?
OSI Systems has 15.9M shares outstanding, of which 15.0M are in the public float.