Who owns OSI Systems (OSIS)
Which tracked institutional funds hold OSIS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OSIS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
51 tracked funds added or opened OSIS while 140 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
OSIS’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes OSIS more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in OSIS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 340 tracked filers holding OSIS, 177 increased or opened the position and 210 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in OSIS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 21
- Jupiter Topco LLC$198M
- BOUSSARD & GAVAUDAN GESTION SAS$20M
- ABSOLUTE INVESTMENT ADVISERS, LLC$16M
- Divisadero Street Capital Management, LP$6M
- XTX Topco Ltd$5M
- Weiss Asset Management LP$4M
Full exits 38
- JANUS HENDERSON GROUP PLC$205M
- Mawer Investment Management Ltd.$176M
- Driehaus Capital Management LLC$31M
- AXIOM INVESTORS LLC /DE$12M
- LORD, ABBETT & CO. LLC$11M
- HRT FINANCIAL LP$9M
Largest adds
- BlackRock, Inc.$104M
- MILLENNIUM MANAGEMENT LLC$54M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$37M
- AMERICAN CENTURY COMPANIES INC$35M
- VOYA INVESTMENT MANAGEMENT LLC$25M
- Channing Capital Management, LLC$24M
Largest trims
- FMR LLC$142M
- VANGUARD PORTFOLIO MANAGEMENT LLC$54M
- LOOMIS SAYLES & CO L P$46M
- BANK OF AMERICA CORP /DE/$41M
- Invesco Ltd.$38M
- Capital International Investors$34M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| ABSOLUTE INVESTMENT ADVISERS, LLC new | 12,008,000 | $16M | 0.4% | 2026-Q2 |
| BlackRock, Inc. added | 2,552,027 | $558M | 13.9% | 2026-Q2 |
| FMR LLC trimmed | 1,738,166 | $380M | 9.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,272,016 | $278M | 7.0% | 2026-Q2 |
| Jupiter Topco LLC new | 905,925 | $198M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 703,070 | $154M | 3.8% | 2026-Q2 |
| STATE STREET CORP added | 674,053 | $147M | 3.7% | 2026-Q2 |
| Capital International Investors trimmed | 596,331 | $130M | 3.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 463,787 | $101M | 2.5% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 452,547 | $99M | 2.5% | 2026-Q2 |
| Channing Capital Management, LLC added | 432,851 | $95M | 2.4% | 2026-Q2 |
| Hood River Capital Management LLC added | 414,304 | $91M | 2.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 414,034 | $91M | 2.3% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added | 379,351 | $83M | 2.1% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 324,715 | $71M | 1.8% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 314,717 | $69M | 1.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 298,480 | $65M | 1.6% | 2026-Q2 |
| Invesco Ltd. trimmed | 263,207 | $58M | 1.4% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ added | 258,180 | $56M | 1.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 223,142 | $49M | 1.2% | 2026-Q2 |
| NEUMEIER POMA INVESTMENT COUNSEL LLC added | 222,515 | $49M | 1.2% | 2026-Q2 |
| Clark Capital Management Group, Inc. trimmed | 218,913 | $48M | 1.2% | 2026-Q2 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP trimmed | 216,098 | $47M | 1.2% | 2026-Q2 |
| UBS Group AG added | 210,866 | $46M | 1.2% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP added | 199,636 | $44M | 1.1% | 2026-Q2 |
| MORGAN STANLEY trimmed | 197,990 | $43M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 193,801 | $42M | 1.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 192,062 | $42M | 1.0% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 189,751 | $41M | 1.0% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 185,377 | $41M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 181,359 | $40M | 1.0% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 177,616 | $39M | 1.0% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 137,340 | $30M | 0.8% | 2026-Q2 |
| Clearbridge Investments, LLC trimmed | 135,261 | $30M | 0.7% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 125,194 | $27M | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 119,675 | $26M | 0.7% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 116,736 | $26M | 0.6% | 2026-Q2 |
| Swedbank AB trimmed | 116,150 | $25M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 111,720 | $24M | 0.6% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 108,672 | $24M | 0.6% | 2026-Q2 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 107,143 | $23M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 105,574 | $23M | 0.6% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 104,535 | $23M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 100,379 | $22M | 0.5% | 2026-Q2 |
| BROWN ADVISORY INC added | 86,852 | $19M | 0.5% | 2026-Q2 |
| Boston Partners trimmed | 82,102 | $18M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 80,052 | $18M | 0.4% | 2026-Q2 |
| Asset Management One Co., Ltd. trimmed | 62,754 | $14M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 59,977 | $13M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 59,655 | $13M | 0.3% | 2026-Q2 |
| Prospect Capital Advisors, LLC added | 57,640 | $13M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 53,240 | $12M | 0.3% | 2026-Q2 |
| First Eagle Investment Management, LLC added | 52,162 | $11M | 0.3% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 48,751 | $11M | 0.3% | 2026-Q2 |
| MIROVA trimmed | 46,000 | $10M | 0.3% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 43,518 | $9M | 0.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 42,085 | $9M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 38,359 | $8M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 37,031 | $8M | 0.2% | 2026-Q2 |
| Robeco Schweiz AG | 36,500 | $8M | 0.2% | 2026-Q2 |
| PDT Partners, LLC trimmed | 34,904 | $8M | 0.2% | 2026-Q2 |
| GHP Investment Advisors, Inc. added | 34,798 | $8M | 0.2% | 2026-Q2 |
| Bridge City Capital, LLC added | 33,318 | $7M | 0.2% | 2026-Q2 |
| Manatuck Hill Partners, LLC added | 33,300 | $7M | 0.2% | 2026-Q2 |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC added | 32,959 | $7M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 31,380 | $7M | 0.2% | 2026-Q2 |
| STIFEL FINANCIAL CORP added | 29,166 | $6M | 0.2% | 2026-Q2 |
| Divisadero Street Capital Management, LP new | 27,859 | $6M | 0.2% | 2026-Q2 |
| Advisors Asset Management, Inc. added | 25,735 | $6M | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 23,880 | $5M | 0.1% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 22,774 | $5M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 22,715 | $5M | 0.1% | 2026-Q2 |
| Daiichi Life Insurance Co., Ltd. trimmed | 21,398 | $5M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 21,267 | $5M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 20,686 | $5M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 20,599 | $5M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 19,825 | $4M | 0.1% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC added | 19,422 | $4M | 0.1% | 2026-Q2 |
| Stanley-Laman Group, Ltd. trimmed | 18,722 | $4M | 0.1% | 2026-Q2 |
| Weiss Asset Management LP new | 18,580 | $4M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 18,144 | $4M | 0.1% | 2026-Q2 |
| OAK RIDGE INVESTMENTS LLC added | 17,600 | $4M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 17,540 | $4M | 0.1% | 2026-Q2 |
| MML INVESTORS SERVICES, LLC added | 16,729 | $4M | 0.1% | 2026-Q2 |
| CHATHAM CAPITAL GROUP, INC. added | 16,405 | $4M | 0.1% | 2026-Q2 |
| Moody Aldrich Partners LLC trimmed | 16,368 | $4M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 16,064 | $4M | 0.1% | 2026-Q2 |
| Hilton Capital Management, LLC new | 15,476 | $3M | 0.1% | 2026-Q2 |
| Moran Wealth Management, LLC added | 15,352 | $3M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd trimmed | 14,752 | $3M | 0.1% | 2026-Q2 |
| BOUSSARD & GAVAUDAN GESTION SAS new | 14,700 | $20M | 0.5% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 13,702 | $3M | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 13,120 | $3M | 0.1% | 2026-Q2 |
| Trexquant Investment LP trimmed | 13,054 | $3M | 0.1% | 2026-Q2 |
| WEDGE CAPITAL MANAGEMENT L L P/NC added | 13,052 | $3M | 0.1% | 2026-Q2 |
| Livforsakringsbolaget Skandia, Omsesidigt | 12,900 | $3M | 0.1% | 2026-Q2 |
| CREDIT AGRICOLE S A trimmed | 12,446 | $3M | 0.1% | 2026-Q2 |
| WESBANCO BANK INC added | 12,327 | $3M | 0.1% | 2026-Q2 |
| Cetera Investment Advisers added | 12,285 | $3M | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 12,001 | $3M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.