Koss Corporation (KOSS) ownership: Top institutional holder: VANGUARD GROUP INC ($923183.00). Insider activity: Net Seller (0 buys, 7 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 222991.00 | $923183.00 | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 189607.00 | $678793.00 | 2026-03-31 |
| BlackRock, Inc. | 89601.00 | $320771.00 | 2026-03-31 |
| CITADEL ADVISORS LLC | 28725.00 | $211991.00 | 2024-12-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 55913.00 | $200202.00 | 2026-03-31 |
| VANGUARD FIDUCIARY TRUST CO | 31334.00 | $112176.00 | 2026-03-31 |
| GOLDMAN SACHS GROUP INC | 17006.00 | $86390.00 | 2025-09-30 |
| DIMENSIONAL FUND ADVISORS LP | 21611.00 | $77367.00 | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-06 | |
| Sell | null | 2026-05-06 | |
| Sell | null | 2026-02-17 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 |
Back to KOSS overview · KOSS earnings · All congressional trades
Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.