Aytu BioPharma, Inc. (AYTU) Ownership
AYTU ownership summary
as of October 17, 2026- Institutions
- 35.5% of shares outstanding
- Insiders
- 8.16% of shares outstanding
- Shares outstanding
- 10.9M
- Float
- 7.7M shares available to trade
- Short interest
- 3.69% 345K shares short
- Days to cover
- 7.10 short interest up 10.8% vs prior month
- Institutions 35.51%
- Insiders 8.16%
- Other investors 56.32%
AYTU top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Nantahala Capital Management, LLC | 20.00% | 2.2M | $4.4M | +1.1M (+100.0%) | June 30, 2026 |
| 2 | Stonepine Capital Management Llc | 8.40% | 913K | $1.9M | +120,632 (+15.2%) | June 30, 2026 |
| 3 | Awm Investment Company Inc | 5.70% | 620K | $1.3M | — | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 2.40% | 261K | $532,738 | — | June 30, 2026 |
| 5 | CROWN ADVISORS MANAGEMENT, INC. | 1.84% | 200K | $408,000 | +55,000 (+37.9%) | June 30, 2026 |
| 6 | Diadema Partners LP | 1.37% | 149K | $303,034 | −204,531 (−57.9%) | June 30, 2026 |
| 7 | Two Sigma Investments LLC | 0.97% | 105K | $214,865 | −16,647 (−13.6%) | June 30, 2026 |
| 8 | Renaissance Technologies Corp | 0.96% | 105K | $213,839 | +11,100 (+11.8%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 0.86% | 94K | $191,040 | +1,011 (+1.1%) | June 30, 2026 |
| 10 | Arete Wealth Advisors, LLC | 0.46% | 50K | $101,080 | +49,549 (0.0%) | March 31, 2026 |
| 11 | Citadel Advisors Llc | 0.45% | 49K | $100,805 | +12,573 (+34.1%) | June 30, 2026 |
| 12 | Vanguard Fiduciary Trust Co | 0.43% | 47K | $95,978 | — | June 30, 2026 |
| 13 | Dimensional Fund Advisors, Inc. | 0.42% | 45K | $92,465 | +1,741 (+4.0%) | June 30, 2026 |
| 14 | Persistent Asset Partners Limited | 0.35% | 38K | $77,487 | −54,913 (−59.1%) | June 30, 2026 |
| 15 | Northern Trust Corp | 0.26% | 28K | $56,967 | +8,756 (+45.7%) | June 30, 2026 |
| 16 | Bellevue Asset Management, LLC | 0.23% | 25K | $51,027 | — | June 30, 2026 |
| 17 | BlackRock Inc | 0.21% | 23K | $46,498 | — | June 30, 2026 |
| 18 | XTX Topco Ltd | 0.20% | 21K | $43,689 | −166 (−0.8%) | June 30, 2026 |
| 19 | Acadian Asset Management LLC | 0.09% | 10K | $20,883 | — | June 30, 2026 |
| 20 | Daytona Street Capital LLC | 0.09% | 10K | $20,400 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 1.3M shares and 4 cut 276K.
AYTU top mutual fund and ETF holders
18 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 1.56% | 169K | $344,760 | — | August 31, 2026 |
| 2 | Fidelity Extended Market Index | 0.45% | 49K | $99,244 | −261 (−0.5%) | August 31, 2026 |
| 3 | Perritt MicroCap Opportunities Investor | 0.18% | 20K | $40,800 | +20,000 (0.0%) | December 31, 2025 |
| 4 | Fidelity Series Total Market Index | 0.13% | 14K | $28,756 | — | August 31, 2026 |
| 5 | Fidelity Total Market Index | 0.09% | 9,757 | $19,904 | — | August 31, 2026 |
| 6 | DFA US Core Equity Class F | 0.05% | 5,523 | $11,267 | — | July 31, 2026 |
| 7 | DFA US Vector Equity I | 0.05% | 5,481 | $11,181 | — | August 31, 2026 |
| 8 | DFA US Vector Equity Class F | 0.05% | 5,319 | $10,851 | — | July 31, 2026 |
| 9 | Dimensional US Sustainability Core 1 ETF | 0.04% | 4,805 | $9,802 | — | September 30, 2026 |
| 10 | DFA US Sustainability Core 1 | 0.04% | 4,640 | $9,466 | — | August 31, 2026 |
| 11 | Dimensional US Small Cap ETF | 0.04% | 4,402 | $8,980 | — | September 30, 2026 |
| 12 | Dimensional US Core Equity 2 ETF | 0.04% | 4,122 | $8,409 | — | September 30, 2026 |
| 13 | DFA US Core Equity 1 I | 0.04% | 4,100 | $8,364 | — | August 31, 2026 |
| 14 | Dimensional US Core Equity 1 ETF | 0.02% | 2,147 | $4,380 | — | September 24, 2026 |
| 15 | DFA US Social Core Equity 2 Portfolio | 0.02% | 1,741 | $3,552 | — | August 31, 2026 |
| 16 | DFA US Core Equity 2 I | 0.02% | 1,710 | $3,488 | — | August 31, 2026 |
| 17 | Bridgeway Omni Small-Cap Value N | 0.01% | 1,500 | $3,060 | — | June 30, 2026 |
| 18 | Dimensional US Core Equity USD Acc | 0.01% | 1,336 | $2,725 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AYTU insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-02-28 | Joshua R Disbrow | Buy | $1.30 | 15,000 | $19,500 |
| 2023-06-16 | Greg Pyszczymuka | Buy | $1.87 | 12,000 | $22,440 |
| 2023-06-14 | Joshua R Disbrow | Buy | $1.86 | 14,000 | $26,040 |
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.
AYTU shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AYTU
Institutional investors own 35.5% of Aytu BioPharma's shares and insiders 8.16%. The largest holder is Nantahala Capital Management, LLC with 20.00% of the shares (2.2M), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 4 reduced their stake in the latest filings. Short interest is 3.69% of the float, or 7.10 days of average trading volume. The share count rose 10,036,300.0% since 2016.
Related: AYTU analyst forecast, AYTU key metrics. See the AYTU stock overview for the latest quote and news.
AYTU ownership FAQ
Who owns the most Aytu BioPharma stock?
The largest shareholders of Aytu BioPharma are Nantahala Capital Management, LLC (20.00%), Stonepine Capital Management Llc (8.40%), Awm Investment Company Inc (5.70%), Vanguard Capital Management, LLC (2.40%), CROWN ADVISORS MANAGEMENT, INC. (1.84%).
What percentage of Aytu BioPharma is owned by institutions?
Institutions hold 35.5% of Aytu BioPharma's shares outstanding; insiders hold 8.16%.
Which funds own Aytu BioPharma?
The largest fund holders of Aytu BioPharma are Vanguard MStar Total Stk Mkt Idx Invest (1.56%), Fidelity Extended Market Index (0.45%), Perritt MicroCap Opportunities Investor (0.18%), Fidelity Series Total Market Index (0.13%), Fidelity Total Market Index (0.09%).
What is Aytu BioPharma's short interest?
345K shares of Aytu BioPharma were sold short, 3.69% of the float; at the average daily volume it would take 7.10 days to cover.
Are insiders buying or selling Aytu BioPharma?
Of the latest 3 reported insider transactions in Aytu BioPharma (since June 14, 2023), 3 were purchases and 0 were sales.
How many shares of Aytu BioPharma are outstanding?
Aytu BioPharma has 10.9M shares outstanding, of which 7.7M are in the public float.