Koss Corporation (KOSS) Ownership
KOSS ownership summary
as of October 18, 2026- Institutions
- 5.3% of shares outstanding
- Insiders
- 44.10% of shares outstanding
- Shares outstanding
- 9.5M
- Float
- 5.5M shares available to trade
- Short interest
- 4.30% 112K shares short
- Days to cover
- 1.94 short interest down 9.2% vs prior month
- Institutions 5.34%
- Insiders 44.10%
- Other investors 50.56%
KOSS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 2.00% | 190K | $693,962 | — | June 30, 2026 |
| 2 | BlackRock Inc | 1.00% | 95K | $347,616 | +5,376 (+6.0%) | June 30, 2026 |
| 3 | Geode Capital Management, LLC | 0.63% | 59K | $217,737 | +3,578 (+6.4%) | June 30, 2026 |
| 4 | Citadel Advisors Llc | 0.35% | 33K | $120,992 | +33,058 (0.0%) | June 30, 2026 |
| 5 | Vanguard Fiduciary Trust Co | 0.32% | 31K | $112,508 | −594 (−1.9%) | June 30, 2026 |
| 6 | Dimensional Fund Advisors, Inc. | 0.26% | 24K | $89,425 | +2,822 (+13.1%) | June 30, 2026 |
| 7 | State Street Corp | 0.19% | 18K | $65,785 | — | June 30, 2026 |
| 8 | James Investment Research, Inc. | 0.16% | 15K | $56,638 | — | June 30, 2026 |
| 9 | Goss Wealth Management LLC | 0.16% | 15K | $56,638 | — | June 30, 2026 |
| 10 | Northern Trust Corp | 0.11% | 10K | $37,650 | −3,998 (−28.0%) | June 30, 2026 |
| 11 | UBS Group AG | 0.02% | 2,161 | $7,909 | −3,952 (−64.6%) | June 30, 2026 |
| 12 | Vanguard Global Advisers, LLC | 0.02% | 2,040 | $7,466 | — | June 30, 2026 |
| 13 | N.E.W. Advisory Services LLC | 0.01% | 1,000 | $3,660 | — | June 30, 2026 |
| 14 | Activest Wealth Management | 0.01% | 1,000 | $3,660 | — | June 30, 2026 |
| 15 | Tower Research Capital LLC | 0.01% | 672 | $2,460 | −540 (−44.6%) | June 30, 2026 |
| 16 | Creative Financial Designs Inc | <0.01% | 300 | $1,098 | — | June 30, 2026 |
| 17 | SBI Securities Co Ltd | <0.01% | 120 | $439 | — | June 30, 2026 |
| 18 | Morgan Stanley - Brokerage Accounts | <0.01% | 80 | $293 | — | June 30, 2026 |
| 19 | Advisor Group Holdings, Inc. | <0.01% | 50 | $183 | — | June 30, 2026 |
| 20 | Barclays PLC | <0.01% | 23 | $84 | +23 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 5 holders added 45K shares and 4 cut 9,084.
KOSS top mutual fund and ETF holders
18 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 1.29% | 122K | $447,051 | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.28% | 26K | $96,694 | −142 (−0.5%) | August 31, 2026 |
| 3 | iShares Micro-Cap ETF | 0.19% | 18K | $67,084 | −126 (−0.7%) | September 30, 2026 |
| 4 | Fidelity Total Market Index | 0.12% | 11K | $41,805 | — | August 31, 2026 |
| 5 | Fidelity Series Total Market Index | 0.08% | 7,407 | $27,110 | — | August 31, 2026 |
| 6 | EA Bridgeway Omni Small-Cap Value ETF | 0.07% | 6,323 | $23,142 | — | September 30, 2026 |
| 7 | DFA US Micro Cap I | 0.05% | 4,843 | $17,725 | — | August 31, 2026 |
| 8 | DFA US Core Equity 2 I | 0.03% | 2,964 | $10,848 | — | August 31, 2026 |
| 9 | DFA US Vector Equity I | 0.03% | 2,822 | $10,329 | — | August 31, 2026 |
| 10 | DFA US Core Equity Class F | 0.02% | 2,186 | $8,001 | — | July 31, 2026 |
| 11 | DFA US Sustainability Core 1 | 0.02% | 2,113 | $7,734 | — | August 31, 2026 |
| 12 | Vanguard U.S. Eq Idx £ Acc | 0.02% | 2,040 | $7,466 | — | August 31, 2026 |
| 13 | Dimensional US Core Equity 1 ETF | 0.02% | 1,996 | $7,305 | — | September 24, 2026 |
| 14 | DFA US Core Equity 1 I | 0.02% | 1,917 | $7,016 | — | August 31, 2026 |
| 15 | Dimensional US Core Equity 2 ETF | 0.02% | 1,849 | $6,767 | — | September 30, 2026 |
| 16 | 1290 VT Micro Cap K | 0.01% | 1,055 | $3,861 | — | August 31, 2026 |
| 17 | Fidelity Nasdaq Composite Index | 0.01% | 829 | $3,034 | — | August 31, 2026 |
| 18 | DFA US Vector Equity Class F | 0.01% | 712 | $2,606 | — | July 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
KOSS insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-02 | Lenore Lillie | Buy | $4.96 | 2,500 | $12,400 |
| 2025-06-13 | Michael J Koss Jr | Sell | $4.78 | 24,643 | $117,794 |
| 2025-06-12 | Michael J Koss Jr | Sell | $4.91 | 6,000 | $29,460 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
KOSS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns KOSS
Institutional investors own 5.3% of Koss's shares and insiders 44.10%. The largest holder is Vanguard Capital Management, LLC with 2.00% of the shares (190K), as of June 30, 2026. Among the top 20 institutions, 5 added shares and 4 reduced their stake in the latest filings. Short interest is 4.30% of the float, or 1.94 days of average trading volume. The share count rose 28.2% since 2014.
Related: KOSS key metrics. See the KOSS stock overview for the latest quote and news.
KOSS ownership FAQ
Who owns the most Koss stock?
The largest shareholders of Koss are Vanguard Capital Management, LLC (2.00%), BlackRock Inc (1.00%), Geode Capital Management, LLC (0.63%), Citadel Advisors Llc (0.35%), Vanguard Fiduciary Trust Co (0.32%).
What percentage of Koss is owned by institutions?
Institutions hold 5.3% of Koss's shares outstanding; insiders hold 44.10%.
Which funds own Koss?
The largest fund holders of Koss are Vanguard MStar Total Stk Mkt Idx Invest (1.29%), Fidelity Extended Market Index (0.28%), iShares Micro-Cap ETF (0.19%), Fidelity Total Market Index (0.12%), Fidelity Series Total Market Index (0.08%).
What is Koss's short interest?
112K shares of Koss were sold short, 4.30% of the float; at the average daily volume it would take 1.94 days to cover.
Are insiders buying or selling Koss?
Of the latest 3 reported insider transactions in Koss (since June 12, 2025), 1 were purchases and 2 were sales.
How many shares of Koss are outstanding?
Koss has 9.5M shares outstanding, of which 5.5M are in the public float.