Osi Systems Inc (OSIS) Institutional Ownership

Ownership Summary

A total of 336 institutions have reported a stake in Osi Systems Inc (NASDAQ:OSIS) as of December 2025, according to recent 13F filings with the SEC.

• These investors collectively held 104.4% of the company's total shares outstanding in December 2025, down from 107.3% in September 2025.
• Institutional share ownership changed by 3.42% QoQ, while the number of institutional owners saw an increase of 11.63% YoY.
• Of these 336 institutional investors, 181 increased their holdings in Osi Systems, while 105 of them reduced positions, and 50 investors maintained their exposure.
• The total number of shares held by institutions in Osi Systems increased to 18.09Mn as of December 2025, a net change of up by 597.42K shares quarter on quarter, and up 60.06K shares year over year.
• With 2.56Mn shares, BlackRock, Inc. commands the largest institutional position in Osi Systems as of December 31, 2025, equating to 14.79% of the company.
• Among the most significant buyers of Osi Systems during December 2025 were FMR LLC (567.16K), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (191.33K), NOMURA ASSET MANAGEMENT INTERNATIONAL INC. (188.97K), DRIEHAUS CAPITAL MANAGEMENT LLC (88.71K), BlackRock, Inc. (57.65K).
• Leading sellers of Osi Systems stock in December 2025 included JANUS HENDERSON GROUP PLC (247.72K), Clearbridge Investments, LLC (59.50K), BROWN ADVISORY INC (58.70K), Mawer Investment Management Ltd. (52.78K), MILLENNIUM MANAGEMENT LLC (52.42K).
• The top 10 institutional holders of Osi Systems for the quarter ending December 2025 included BlackRock, Inc. (2.56Mn), VANGUARD GROUP INC (2.11Mn), FMR LLC (1.66Mn), Mawer Investment Management Ltd. (803.60K), JANUS HENDERSON GROUP PLC (752.57K), Capital International Investors (674.34K), STATE STREET CORP (658.17K), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (498.25K), GEODE CAPITAL MANAGEMENT, LLC (410.96K), DIMENSIONAL FUND ADVISORS LP (406.89K).