OSIS OSI Systems, Inc.

NASDAQ
$204.29

OSI Systems, Inc. (OSIS) Institutional Ownership

What the institutions did with OSIS last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
415
filed both this quarter and last
Managers holding
357
-4 on the quarter
Buyers
182
54 opened new
Sellers
193
58 sold out entirely
Buyer share
48.5%
of managers who traded it
Breadth
-2.9
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
BlackRock, Inc. 2.6M 13.4%
FMR LLC 1.7M 9.2%
VANGUARD PORTFOLIO MANAGEMENT LLC 1.3M 6.7%
Jupiter Topco LLC 905.9K 4.8%
VANGUARD CAPITAL MANAGEMENT LLC 703.1K 3.7%
STATE STREET CORP 674.1K 3.6%
Capital International Investors 596.3K 3.1%
GEODE CAPITAL MANAGEMENT, LLC 463.8K 2.4%
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 452.5K 2.4%
Channing Capital Management, LLC 432.9K 2.3%
Hood River Capital Management LLC 414.3K 2.2%
DIMENSIONAL FUND ADVISORS LP 414.0K 2.2%
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 379.4K 2.0%
NEUBERGER BERMAN GROUP LLC 324.7K 1.7%
PRICE T ROWE ASSOCIATES INC /MD/ 314.7K 1.7%
MILLENNIUM MANAGEMENT LLC 298.5K 1.6%
Invesco Ltd. 263.2K 1.4%
PRIMECAP MANAGEMENT CO/CA/ 258.2K 1.4%
AMERICAN CENTURY COMPANIES INC 223.1K 1.2%
NEUMEIER POMA INVESTMENT COUNSEL LLC 222.5K 1.2%
Clark Capital Management Group, Inc. 218.9K 1.2%
SYSTEMATIC FINANCIAL MANAGEMENT LP 216.1K 1.1%
UBS Group AG 210.9K 1.1%
VAN ECK ASSOCIATES CORP 199.6K 1.1%
MORGAN STANLEY 198.0K 1.0%

Largest changes

Manager Action Previous Current Change
Mawer Investment Management Ltd. Sold Out 662.6K 0 -662.6K
MILLENNIUM MANAGEMENT LLC Increased 43.6K 298.5K +254.9K
FMR LLC Reduced 2.0M 1.7M -228.9K
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Increased 171.7K 379.4K +207.7K
AMERICAN CENTURY COMPANIES INC Increased 51.0K 223.1K +172.1K
LOOMIS SAYLES & CO L P Reduced 191.5K 22.8K -168.7K
Channing Capital Management, LLC Increased 266.9K 432.9K +166.0K
BANK OF AMERICA CORP /DE/ Reduced 266.4K 137.3K -129.0K
Driehaus Capital Management LLC Sold Out 118.0K 0 -118.0K
VOYA INVESTMENT MANAGEMENT LLC Increased 9.1K 125.2K +116.1K
Invesco Ltd. Reduced 373.3K 263.2K -110.1K
T. Rowe Price Investment Management, Inc. New 0 101.6K +101.6K
AMERIPRISE FINANCIAL INC Increased 94.1K 185.4K +91.3K
WELLINGTON MANAGEMENT GROUP LLP Increased 93.8K 177.6K +83.9K
First Eagle Investment Management, LLC Increased 24.7K 104.3K +79.7K
UBS Group AG Increased 136.0K 210.9K +74.9K
PRICE T ROWE ASSOCIATES INC /MD/ Increased 259.5K 314.7K +55.2K
Clark Capital Management Group, Inc. Reduced 270.4K 218.9K -51.5K
AXIOM INVESTORS LLC /DE Sold Out 45.1K 0 -45.1K
NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Reduced 161.5K 116.7K -44.8K
GOLDMAN SACHS GROUP INC Increased 75.1K 119.7K +44.6K
LORD, ABBETT & CO. LLC Sold Out 43.1K 0 -43.1K
Hood River Capital Management LLC Increased 372.1K 414.3K +42.2K
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Reduced 232.5K 192.1K -40.4K
NEW YORK STATE COMMON RETIREMENT FUND Increased 71.5K 108.7K +37.2K
Nicholas Investment Partners, LP Sold Out 31.6K 0 -31.6K
NEUMEIER POMA INVESTMENT COUNSEL LLC Increased 191.4K 222.5K +31.1K
Clearbridge Investments, LLC Reduced 163.6K 135.3K -28.3K
Divisadero Street Capital Management, LP New 0 27.9K +27.9K
SG Capital Management LLC Sold Out 27.0K 0 -27.0K
Capital International Investors Reduced 619.5K 596.3K -23.1K
GEODE CAPITAL MANAGEMENT, LLC Increased 440.7K 463.8K +23.1K
XTX Topco Ltd New 0 22.7K +22.7K
BlackRock, Inc. Increased 2.5M 2.6M +22.4K
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 1.2M 1.3M +22.3K
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Increased 430.6K 452.5K +22.0K
NEUBERGER BERMAN GROUP LLC Increased 303.9K 324.7K +20.8K
Asset Management One Co., Ltd. Reduced 83.3K 62.8K -20.6K
Shannon River Fund Management LLC Sold Out 19.3K 0 -19.3K
MIROVA Reduced 65.0K 46.0K -19.0K
DIMENSIONAL FUND ADVISORS LP Increased 395.4K 414.0K +18.6K
Weiss Asset Management LP New 0 18.6K +18.6K
Manatuck Hill Partners, LLC Increased 15.3K 33.3K +18.0K
BNP PARIBAS FINANCIAL MARKETS Reduced 97.9K 80.1K -17.9K
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC Increased 2.4K 19.4K +17.0K
JPMORGAN CHASE & CO Increased 172.8K 189.8K +17.0K
Hilton Capital Management, LLC New 0 15.5K +15.5K
Harvest Investment Services, LLC Sold Out 15.2K 0 -15.2K
CITADEL ADVISORS LLC Sold Out 14.9K 0 -14.9K
CITIGROUP INC Increased 5.6K 19.8K +14.2K
PRIMECAP MANAGEMENT CO/CA/ Increased 244.7K 258.2K +13.5K
D. E. Shaw & Co., Inc. Increased 7.3K 20.6K +13.3K
Universal- Beteiligungs- und Servicegesellschaft mbH Reduced 14.9K 1.7K -13.2K
Trexquant Investment LP New 0 13.1K +13.1K
Dai-ichi Life Insurance Company, Ltd Reduced 34.2K 21.4K -12.8K
CREDIT AGRICOLE S A Reduced 25.2K 12.4K -12.7K
MORGAN STANLEY Reduced 210.4K 198.0K -12.4K
STATE STREET CORP Increased 662.1K 674.1K +11.9K
VAN ECK ASSOCIATES CORP Increased 188.2K 199.6K +11.5K
TRUIST FINANCIAL CORP Reduced 17.7K 6.3K -11.4K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.