OSI Systems, Inc. (OSIS) ownership: Top institutional holder: BlackRock, Inc. ($671.64M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 2529623.00 | $671.64M | 2026-03-31 |
| VANGUARD GROUP INC | 2106595.00 | $537.31M | 2025-12-31 |
| FMR LLC | 1967088.00 | $522.28M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1249748.00 | $331.82M | 2026-03-31 |
| JANUS HENDERSON GROUP PLC | 772314.00 | $205.06M | 2026-03-31 |
| Jupiter Topco LLC | 905925.00 | $198.13M | 2026-06-30 |
| VANGUARD CAPITAL MANAGEMENT LLC | 699253.00 | $185.66M | 2026-03-31 |
| Mawer Investment Management Ltd. | 662634.00 | $175.94M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-07-31 | |
| Sell | null | 2026-07-31 | |
| Sell | null | 2026-07-31 | |
| Sell | null | 2026-07-31 | |
| Sell | null | 2026-07-31 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.