OSI SYSTEMS INC (OSIS)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
345
Reporting holders
$4.1B
Reported value
112.9%
Of shares outstanding
0.9%
Held as options
-3
Holder change
Institutions report 18,617,229 shares against 16,482,890 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Share count carried from an earlier filing (concept 2026-04-28); over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $558.1M | 2,552,027 | 0.01% | 8q | +0.9%+$4.9M |
| FMR LLC | $380.1M | 1,738,166 | 0.02% | 31q | -11.6%-$50.1M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $278.2M | 1,272,016 | 0.01% | 2q | +1.8%+$4.9M |
| Jupiter Topco LLC | $198.1M | 905,925 | 0.08% | new | FIRST |
| VANGUARD CAPITAL MANAGEMENT LLC | $153.8M | 703,070 | 0.00% | 2q | +0.5%+$834.8K |
| STATE STREET CORP | $147.4M | 674,053 | 0.00% | 31q | +1.8%+$2.6M |
| Capital International Investors | $130.4M | 596,331 | 0.03% | 7q | -3.7%-$5.1M |
| GEODE CAPITAL MANAGEMENT, LLC | $101.4M | 463,787 | 0.01% | 31q | +5.2%+$5.0M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $99.0M | 452,547 | 0.02% | 31q | +5.1%+$4.8M |
| Channing Capital Management, LLC | $94.7M | 432,851 | 2.18% | 2q | +62.2%+$36.3M |
| Hood River Capital Management LLC | $90.6M | 414,304 | 0.66% | 13q | +11.3%+$9.2M |
| DIMENSIONAL FUND ADVISORS LP | $90.5M | 414,034 | 0.02% | 31q | +4.7%+$4.1M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $83.0M | 379,351 | 0.25% | 3q | +121.0%+$45.4M |
| NEUBERGER BERMAN GROUP LLC | $70.9M | 324,715 | 0.05% | 31q | +6.8%+$4.5M |
| MILLENNIUM MANAGEMENT LLC | $65.3M | 298,480 | 0.02% | 5q | +584.4%+$55.7M |
| Invesco Ltd. | $57.6M | 263,207 | 0.00% | 31q | -29.5%-$24.1M |
| PRIMECAP MANAGEMENT CO/CA/ | $56.5M | 258,180 | 0.03% | 31q | +5.5%+$3.0M |
| AMERICAN CENTURY COMPANIES INC | $48.8M | 223,142 | 0.02% | 7q | +337.6%+$37.6M |
| NEUMEIER POMA INVESTMENT COUNSEL LLC | $48.7M | 222,515 | 3.33% | 31q | +16.2%+$6.8M |
| Clark Capital Management Group, Inc. | $47.9M | 218,913 | 0.26% | 11q | -19.0%-$11.3M |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | $47.3M | 216,098 | 0.94% | 31q | -1.4%-$687.4K |
| UBS Group AG | $46.1M | 210,866 | 0.01% | 31q | +55.1%+$16.4M |
| VAN ECK ASSOCIATES CORP | $43.7M | 199,636 | 0.03% | 14q | +6.1%+$2.5M |
| MORGAN STANLEY | $43.3M | 197,990 | 0.00% | 35q | -5.9%-$2.7M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $42.4M | 193,801 | 0.01% | 31q | -3.6%-$1.6M |
| Sixth Street Partners Management Company, L.P. | $42.4M | 193,801 | 0.01% | new | NEW |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $41.9M | 192,062 | 0.05% | 4q | -17.4%-$8.8M |
| JPMORGAN CHASE & CO | $40.6M | 189,751 | 0.00% | 31q | +9.8%+$3.6M |
| AMERIPRISE FINANCIAL INC | $40.5M | 185,377 | 0.01% | 31q | -1.5%-$621.8K |
| NORTHERN TRUST CORP | $39.7M | 181,359 | 0.00% | 31q | +6.1%+$2.3M |
| WELLINGTON MANAGEMENT GROUP LLP | $38.8M | 177,616 | 0.01% | 3q | +89.4%+$18.3M |
| BANK OF AMERICA CORP /DE/ | $30.0M | 137,340 | 0.00% | 31q | -48.4%-$28.2M |
| Clearbridge Investments, LLC | $29.6M | 135,261 | 0.02% | 31q | -17.3%-$6.2M |
| VOYA INVESTMENT MANAGEMENT LLC | $27.4M | 125,194 | 0.02% | 31q | +1276.4%+$25.4M |
| GOLDMAN SACHS GROUP INC | $26.2M | 119,675 | 0.00% | 31q | +59.3%+$9.7M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $25.5M | 116,736 | 0.04% | 3q | -27.7%-$9.8M |
| Swedbank AB | $25.4M | 116,150 | 0.02% | 6q | -1.4%-$347.7K |
| VANGUARD FIDUCIARY TRUST CO | $24.4M | 111,720 | 0.01% | 2q | +3.8%+$889.7K |
| NEW YORK STATE COMMON RETIREMENT FUND | $23.8M | 108,672 | 0.03% | 31q | +52.0%+$8.1M |
| OBERWEIS ASSET MANAGEMENT INC/ | $23.4M | 107,143 | 0.48% | 12q | +0.5%+$120.3K |
| Public Sector Pension Investment Board | $23.3M | 106,480 | 0.03% | 31q | +92.3%+$11.2M |
| PRINCIPAL FINANCIAL GROUP INC | $23.1M | 105,574 | 0.01% | 31q | +3.1%+$690.4K |
| ENVESTNET ASSET MANAGEMENT INC | $22.9M | 104,535 | 0.01% | 19q | +4.1%+$909.4K |
| Bank of New York Mellon Corp | $22.0M | 100,379 | 0.00% | 31q | +2.3%+$484.9K |
| BROWN ADVISORY INC | $19.0M | 86,852 | 0.03% | 7q | +11.0%+$1.9M |
| Boston Partners | $17.8M | 82,102 | 0.02% | 15q | -5.1%-$961.6K |
| BNP PARIBAS FINANCIAL MARKETS | $17.5M | 80,052 | 0.01% | 31q | -18.2%-$3.9M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16.2M | 1,956 | 0.00% | 31q | -71.3%-$40.4M |
| Asset Management One Co., Ltd. | $13.7M | 62,754 | 0.04% | 31q | -24.7%-$4.5M |
| Nuveen, LLC | $13.1M | 59,977 | 0.00% | 6q | HELD |
| WELLS FARGO & COMPANY/MN | $13.0M | 59,655 | 0.00% | 31q | -41.3%-$9.2M |
| Prospect Capital Advisors, LLC | $12.6M | 57,640 | 5.72% | 31q | +16.5%+$1.8M |
| First Eagle Investment Management, LLC | $11.4M | 52,162 | 0.02% | 7q | +111.5%+$6.0M |
| SEGALL BRYANT & HAMILL, LLC | $10.7M | 48,751 | 0.13% | 2q | +1.8%+$184.1K |
| MIROVA | $10.1M | 46,000 | 0.37% | 2q | -29.2%-$4.2M |
| NORDEA INVESTMENT MANAGEMENT AB | $9.5M | 43,518 | 0.01% | 26q | -4.9%-$486.2K |
| FIRST TRUST ADVISORS LP | $9.2M | 42,085 | 0.01% | 29q | +6.2%+$540.8K |
| RHUMBLINE ADVISERS | $8.4M | 38,359 | 0.01% | 31q | -10.9%-$1.0M |
| Legal & General Group Plc | $8.1M | 37,031 | 0.00% | 31q | -1.6%-$128.4K |
| Robeco Schweiz AG | $8.0M | 36,500 | 0.13% | 3q | HELD |
| PDT Partners, LLC | $7.6M | 34,904 | 0.40% | 7q | -17.1%-$1.6M |
| GHP Investment Advisors, Inc. | $7.6M | 34,798 | 0.28% | 9q | +4.8%+$347.5K |
| Bridge City Capital, LLC | $7.3M | 33,318 | 1.66% | 31q | +47.5%+$2.3M |
| Manatuck Hill Partners, LLC | $7.3M | 33,300 | 2.41% | 13q | +117.6%+$3.9M |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC | $7.2M | 32,959 | 0.75% | 9q | +26.0%+$1.5M |
| Swiss National Bank | $6.9M | 31,380 | 0.00% | 31q | -1.6%-$113.7K |
| STIFEL FINANCIAL CORP | $6.4M | 29,166 | 0.01% | 9q | +0.7%+$45.3K |
| Divisadero Street Capital Management, LP | $6.1M | 27,859 | 0.14% | new | NEW |
| CITADEL ADVISORS LLC | $5.9M | options only | 0.00% | 31q | OPTIONS |
| Advisors Asset Management, Inc. | $5.6M | 25,735 | 0.09% | 28q | +7.8%+$405.9K |
| ALLIANCEBERNSTEIN L.P. | $5.5M | 20,686 | 0.00% | 31q | +13.6%+$657.9K |
| LPL Financial LLC | $5.2M | 23,880 | 0.00% | 7q | -3.4%-$181.3K |
| LOOMIS SAYLES & CO L P | $5.0M | 22,774 | 0.01% | 6q | -88.1%-$36.9M |
| XTX Topco Ltd | $5.0M | 22,715 | 0.06% | new | NEW |
| JANE STREET GROUP, LLC | $4.7M | 945 | 0.00% | 17q | HELD |
| Daiichi Life Insurance Co., Ltd. | $4.7M | 21,398 | 0.11% | 3q | -37.4%-$2.8M |
| DEUTSCHE BANK AG\ | $4.7M | 21,267 | 0.00% | 34q | +15.3%+$618.7K |
| D. E. Shaw & Co., Inc. | $4.5M | 20,599 | 0.00% | 28q | +182.8%+$2.9M |
| CITIGROUP INC | $4.3M | 19,825 | 0.00% | 31q | +254.6%+$3.1M |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | $4.2M | 19,422 | 0.08% | 3q | +707.9%+$3.7M |
| Stanley-Laman Group, Ltd. | $4.1M | 18,722 | 0.42% | 10q | HELD |
| Weiss Asset Management LP | $4.1M | 18,580 | 0.04% | new | NEW |
| OAK RIDGE INVESTMENTS LLC | $3.8M | 17,600 | 0.22% | 3q | +29.8%+$883.8K |
| AQR CAPITAL MANAGEMENT LLC | $3.8M | 17,540 | 0.00% | 29q | -8.2%-$344.0K |
| MML INVESTORS SERVICES, LLC | $3.7M | 16,729 | 0.01% | 9q | +31.7%+$880.0K |
| CHATHAM CAPITAL GROUP, INC. | $3.6M | 16,405 | 0.46% | 12q | +4.5%+$155.9K |
| Moody Aldrich Partners LLC | $3.6M | 16,368 | 0.64% | 9q | -10.2%-$407.9K |
| PRUDENTIAL FINANCIAL INC | $3.5M | 16,064 | 0.00% | 32q | +1.2%+$41.8K |
| Hilton Capital Management, LLC | $3.4M | 15,476 | 0.23% | new | NEW |
| Moran Wealth Management, LLC | $3.4M | 15,352 | 0.09% | 6q | +4.6%+$147.8K |
| Louisiana State Employees Retirement System | $3.3M | 13,700 | 0.03% | 31q | +98.6%+$1.6M |
| SIG BROKERAGE, LP | $3.3M | options only | 0.06% | new | OPTIONS |
| VANGUARD ASSET MANAGEMENT, Ltd | $3.2M | 14,752 | 0.00% | 2q | -0.8%-$26.5K |
| STATE OF WISCONSIN INVESTMENT BOARD | $3.0M | 13,702 | 0.01% | 12q | +2.8%+$82.4K |
| ROYAL BANK OF CANADA | $2.9M | 13,120 | 0.00% | 31q | -0.7%-$19.5K |
| Trexquant Investment LP | $2.9M | 13,054 | 0.02% | new | NEW |
| WEDGE CAPITAL MANAGEMENT L L P/NC | $2.9M | 13,052 | 0.05% | 15q | +7.9%+$209.5K |
| Livforsakringsbolaget Skandia, Omsesidigt | $2.8M | 12,900 | 0.09% | 12q | HELD |
| IMC-Chicago, LLC | $2.8M | options only | 0.00% | 2q | OPTIONS |
| TUDOR INVESTMENT CORP ET AL | $2.7M | options only | 0.00% | new | OPTIONS |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-13 | 13G | JANUS HENDERSON GROUP Ltd. | 5.5% |
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 10.8% |
| 2026-07-31 | 13G | Vanguard Capital Management | 5.0% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 345 | $4.1B | 18,617,229 | 55 | 113 | 123 | 0.9% |
| Q1 2026 | 348 | $4.9B | 18,374,237 | 45 | 110 | 126 | 1.2% |
| Q4 2025 | 333 | $4.7B | 18,180,320 | 45 | 118 | 101 | 0.4% |
| Q3 2025 | 324 | $4.6B | 18,203,515 | 52 | 94 | 120 | 0.8% |
| Q2 2025 | 312 | $4.2B | 18,138,196 | 54 | 99 | 108 | 1.8% |
| Q1 2025 | 283 | $3.7B | 18,657,702 | 48 | 86 | 95 | 1.7% |
| Q4 2024 | 283 | $3.0B | 17,744,718 | 48 | 98 | 83 | 1.8% |
| Q3 2024 | 244 | $2.5B | 16,219,624 | 28 | 90 | 73 | 0.5% |
| Q2 2024 | 237 | $2.1B | 15,248,707 | 36 | 86 | 71 | 0.5% |
| Q1 2024 | 218 | $2.2B | 15,302,763 | 37 | 59 | 80 | 0.2% |
| Q4 2023 | 200 | $2.0B | 15,366,710 | 22 | 68 | 63 | 0.3% |
| Q3 2023 | 204 | $1.7B | 14,583,851 | 31 | 57 | 68 | 0.5% |
| Q2 2023 | 177 | $1.7B | 14,556,448 | 35 | 39 | 61 | 0.2% |
| Q1 2023 | 148 | $1.5B | 14,391,028 | 18 | 46 | 50 | 0.3% |
| Q4 2022 | 137 | $1.0B | 12,919,441 | 20 | 37 | 46 | 0.3% |
| Q3 2022 | 180 | $1.2B | 16,987,520 | 23 | 52 | 66 | 1.2% |
| Q2 2022 | 187 | $1.3B | 15,593,471 | 22 | 48 | 80 | 0.3% |
| Q1 2022 | 183 | $1.4B | 16,039,545 | 13 | 63 | 76 | 0.1% |
| Q4 2021 | 192 | $1.6B | 16,643,689 | 15 | 56 | 72 | 0.0% |
| Q3 2021 | 192 | $1.6B | 16,993,136 | 15 | 58 | 67 | 0.2% |
| Q2 2021 | 193 | $1.8B | 17,382,697 | 14 | 68 | 64 | 0.3% |
| Q1 2021 | 196 | $1.6B | 17,062,631 | 25 | 50 | 70 | 0.3% |
| Q4 2020 | 189 | $1.6B | 17,028,073 | 16 | 52 | 73 | 0.6% |
| Q3 2020 | 189 | $1.3B | 16,931,893 | 25 | 52 | 65 | 2.4% |
| Q2 2020 | 194 | $1.3B | 17,226,955 | 29 | 55 | 67 | 2.3% |
| Q1 2020 | 193 | $1.2B | 17,676,942 | 21 | 63 | 65 | 1.3% |
| Q4 2019 | 221 | $1.9B | 18,400,098 | 19 | 71 | 76 | 2.5% |
| Q3 2019 | 238 | $1.9B | 18,179,099 | 39 | 84 | 57 | 3.3% |
| Q2 2019 | 224 | $2.2B | 18,375,068 | 46 | 65 | 60 | 6.1% |
| Q1 2019 | 202 | $1.6B | 17,951,351 | 40 | 62 | 51 | 3.2% |
| Q4 2018 | 171 | $1.4B | 18,245,922 | 4 | 3 | 4 | 2.3% |