OSIS Institutional Ownership & Shareholders
OSI SYSTEMS INC (OSIS) is currently held by 357 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $3.94B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OSIS tracked by InsiderSet, reporting ownership valued at approximately $558.13M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $488.99M, representing an estimated loss of -12.39% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 51% of the total disclosed OSIS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Fmr Llc, and several other long-term asset managers with concentrated positions in OSI SYSTEMS INC (OSIS).
This page ranks the largest institutional OSIS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
357
Total Reported Value
$3.94B
Largest Holder
Blackrock, Inc.
Largest Position
$558.13M
Insider Transactions (90d)
24
Latest Filing Quarter
Q2 2026
New Institutional Positions
42
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 2,552,027 | $558,128,306 | $488,993,893 | -$69,134,413 | -12.39% | |
| Vanguard Portfolio Management Llc | 0.01% | 1,272,016 | $278,189,899 | $243,730,986 | -$34,458,913 | -12.39% | |
| Fmr Llc | 0.01% | 1,195,207 | $232,276,572 | $229,013,613 | -$3,262,959 | -1.40% | |
| Janus Henderson Group Plc | 0.10% | 772,314 | $205,056,005 | $147,983,086 | -$57,072,919 | -27.83% | |
| Vanguard Capital Management Llc | 0.00% | 703,070 | $153,761,409 | $134,715,243 | -$19,046,166 | -12.39% | |
| State Street Corp | 0.00% | 674,053 | $147,415,391 | $129,155,295 | -$18,260,096 | -12.39% | |
| Capital International Investors | 0.03% | 596,331 | $130,417,590 | $114,262,983 | -$16,154,607 | -12.39% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 430,561 | $114,318,251 | $82,499,793 | -$31,818,458 | -27.83% | |
| Hood River Capital Management Llc | 0.66% | 414,304 | $90,608,285 | $79,384,789 | -$11,223,496 | -12.39% | |
| Dimensional Fund Advisors Lp | 0.02% | 440,281 | $85,574,250 | $84,362,242 | -$1,212,008 | -1.42% | |
| Geode Capital Management, Llc | 0.00% | 422,727 | $82,179,316 | $80,998,720 | -$1,180,596 | -1.44% | |
| Channing Capital Management, Llc | 2.11% | 414,703 | $80,605,822 | $79,461,242 | -$1,144,580 | -1.42% | |
| Neuberger Berman Group Llc | 0.06% | 300,792 | $76,834,304 | $57,634,755 | -$19,199,549 | -24.99% | |
| William Blair Investment Management, Llc | 0.24% | 373,689 | $72,633,931 | $71,602,549 | -$1,031,382 | -1.42% | |
| Price T Rowe Associates Inc | 0.01% | 314,717 | $68,829,000 | $60,302,924 | -$8,526,076 | -12.39% | |
| Millennium Management Llc | 0.04% | 298,480 | $65,277,576 | $57,191,753 | -$8,085,823 | -12.39% | |
| Invesco Ltd. | 0.00% | 263,207 | $57,563,371 | $50,433,093 | -$7,130,278 | -12.39% | |
| Primecap Management Co/Ca/ | 0.03% | 258,180 | $56,463,966 | $49,469,870 | -$6,994,096 | -12.39% | |
| American Century Companies Inc | 0.02% | 223,142 | $48,801,670 | $42,756,239 | -$6,045,431 | -12.39% | |
| Neumeier Poma Investment Counsel Llc | 3.33% | 222,515 | $48,664,031 | $42,636,099 | -$6,027,932 | -12.39% | |
| Clark Capital Management Group, Inc. | 0.26% | 218,913 | $47,876,273 | $41,945,920 | -$5,930,353 | -12.39% | |
| Systematic Financial Management Lp | 0.94% | 216,098 | $47,260,905 | $41,406,538 | -$5,854,367 | -12.39% | |
| Ubs Group Ag | 0.01% | 210,866 | $46,116,394 | $40,404,034 | -$5,712,360 | -12.39% | |
| Van Eck Associates Corp | 0.03% | 199,636 | $43,660,393 | $38,252,254 | -$5,408,139 | -12.39% | |
| Morgan Stanley | 0.00% | 197,990 | $43,300,681 | $37,936,864 | -$5,363,817 | -12.39% | |
| Charles Schwab Investment Management Inc | 0.01% | 193,801 | $42,384,279 | $37,134,210 | -$5,250,069 | -12.39% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.05% | 192,062 | $41,927,097 | $36,801,000 | -$5,126,097 | -12.23% | |
| Jpmorgan Chase & Co | 0.00% | 189,751 | $40,623,073 | $36,358,189 | -$4,264,884 | -10.50% | |
| Ameriprise Financial Inc | 0.01% | 185,377 | $40,542,511 | $35,520,087 | -$5,022,424 | -12.39% | |
| Northern Trust Corp | 0.00% | 181,359 | $39,663,213 | $34,750,198 | -$4,913,015 | -12.39% | |
| Wellington Management Group Llp | 0.01% | 177,616 | $38,844,618 | $34,033,002 | -$4,811,616 | -12.39% | |
| Bank Of America Corp | 0.00% | 137,340 | $30,036,259 | $26,315,717 | -$3,720,542 | -12.39% | |
| Clearbridge Investments, Llc | 0.02% | 135,261 | $29,581,515 | $25,917,360 | -$3,664,155 | -12.39% | |
| Voya Investment Management Llc | 0.02% | 125,194 | $27,379,927 | $23,988,422 | -$3,391,505 | -12.39% | |
| Goldman Sachs Group Inc | 0.00% | 119,675 | $26,172,923 | $22,930,927 | -$3,241,996 | -12.39% | |
| Nomura Asset Management International Inc. | 0.04% | 116,736 | $25,530,000 | $22,367,785 | -$3,162,215 | -12.39% | |
| Vanguard Fiduciary Trust Co | 0.01% | 111,720 | $24,433,164 | $21,406,669 | -$3,026,495 | -12.39% | |
| New York State Common Retirement Fund | 0.03% | 108,672 | $23,766,566 | $20,822,642 | -$2,943,924 | -12.39% | |
| Oberweis Asset Management Inc/ | 0.48% | 107,143 | $23,432,174 | $20,529,670 | -$2,902,504 | -12.39% | |
| Envestnet Asset Management Inc | 0.01% | 104,535 | $22,861,713 | $20,029,951 | -$2,831,762 | -12.39% | |
| T. Rowe Price Investment Management, Inc. | 0.01% | 101,616 | $22,224,000 | $19,470,642 | -$2,753,358 | -12.39% | |
| Sg Capital Management Llc | 1.77% | 104,727 | $20,355,787 | $20,066,740 | -$289,047 | -1.42% | |
| Bank Of New York Mellon Corp | 0.00% | 98,033 | $19,054,743 | $18,784,103 | -$270,640 | -1.42% | |
| Brown Advisory Inc | 0.03% | 86,852 | $18,994,760 | $16,641,712 | -$2,353,048 | -12.39% | |
| Boston Partners | 0.02% | 82,102 | $17,833,313 | $15,731,564 | -$2,101,749 | -11.79% | |
| Bnp Paribas Financial Markets | 0.01% | 80,052 | $17,507,372 | $15,338,764 | -$2,168,608 | -12.39% | |
| Swedbank Ab | 0.01% | 81,000 | $15,743,970 | $15,520,410 | -$223,560 | -1.42% | |
| Principal Financial Group Inc | 0.01% | 75,116 | $14,600,296 | $14,392,977 | -$207,319 | -1.42% | |
| Nuveen, Llc | 0.00% | 59,977 | $13,116,970 | $11,492,193 | -$1,624,777 | -12.39% | |
| Wells Fargo & Company/Mn | 0.00% | 59,655 | $13,046,589 | $11,430,495 | -$1,616,094 | -12.39% |
Frequently asked questions about OSIS
Who are the largest institutional holders of OSIS?
The largest institutional holders of OSIS reported in the latest SEC Form 13F filings include Blackrock, Inc., Vanguard Portfolio Management Llc, Fmr Llc, Janus Henderson Group Plc, and Vanguard Capital Management Llc. InsiderSet ranks institutional holders by their latest reported OSIS position.
What is OSIS institutional ownership?
This page tracks OSIS positions reported by institutional investment managers through SEC Form 13F. OSI SYSTEMS INC (OSIS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own OSIS?
InsiderSet currently tracks 357 institutional managers reporting OSIS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of OSIS shareholders.
How much OSIS stock do institutions own?
Institutional investment managers disclosed approximately $3.94B in OSIS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was OSIS institutional ownership last updated?
The latest OSIS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional OSIS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its OSIS position after the reporting date.
Are institutions buying or selling OSIS?
Institutional buying and selling can be analyzed by comparing OSIS positions across consecutive 13F reporting periods. InsiderSet's OSIS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View OSIS ownership changes.
How has OSIS institutional ownership changed over time?
InsiderSet tracks OSIS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.