Eton Pharmaceuticals, Inc. (ETON) Ownership
ETON ownership summary
as of October 17, 2026- Institutions
- 71.3% of shares outstanding
- Insiders
- 4.89% of shares outstanding
- Shares outstanding
- 28.6M
- Float
- 22.3M shares available to trade
- Short interest
- 8.87% 1.8M shares short
- Days to cover
- 3.32 short interest up 18.9% vs prior month
- Institutions 71.32%
- Insiders 4.89%
- Other investors 23.79%
ETON top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Opaleye Management Inc | 10.01% | 2.9M | $143.9M | — | June 30, 2026 |
| 2 | Nantahala Capital Management, LLC | 8.23% | 2.4M | $118.3M | +1.2M (+100.0%) | June 30, 2026 |
| 3 | EcoR1 Capital, LLC | 7.60% | 2.2M | $109.3M | — | June 30, 2026 |
| 4 | BlackRock Inc | 6.63% | 1.9M | $95.4M | +178,547 (+10.4%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.42% | 977K | $49.1M | −17,519 (−1.8%) | June 30, 2026 |
| 6 | Morgan Stanley - Brokerage Accounts | 2.69% | 768K | $38.6M | +290,015 (+60.7%) | June 30, 2026 |
| 7 | State Street Corp | 2.46% | 702K | $35.3M | +171,571 (+32.4%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 2.28% | 652K | $32.8M | +74,637 (+12.9%) | June 30, 2026 |
| 9 | Oberweis Asset Management Inc | 1.75% | 502K | $25.2M | +62,300 (+14.2%) | June 30, 2026 |
| 10 | National Philanthropic Trust | 1.72% | 492K | $24.8M | — | June 30, 2026 |
| 11 | Westside Investment Management, Inc. | 1.51% | 431K | $21.7M | −36,755 (−7.9%) | June 30, 2026 |
| 12 | Pillsbury Lake Capital LLC | 1.35% | 387K | $19.5M | +22,203 (+6.1%) | June 30, 2026 |
| 13 | Nuveen, LLC | 1.31% | 376K | $18.9M | +317,757 (+548.3%) | June 30, 2026 |
| 14 | BNP Paribas Arbitrage, SA | 1.13% | 322K | $16.2M | +20,358 (+6.7%) | June 30, 2026 |
| 15 | Woodline Partners LP | 1.09% | 311K | $15.6M | +140,180 (+82.1%) | June 30, 2026 |
| 16 | Thompson, Siegel & Walmsley LLC | 1.04% | 297K | $15.0M | −108,857 (−26.8%) | June 30, 2026 |
| 17 | Northern Trust Corp | 0.90% | 256K | $12.9M | +18,017 (+7.6%) | June 30, 2026 |
| 18 | Marshall Wace Asset Management Ltd | 0.87% | 249K | $12.5M | +166,461 (+201.2%) | June 30, 2026 |
| 19 | Panoramic Capital, LLC | 0.73% | 208K | $10.5M | +23,192 (+12.5%) | June 30, 2026 |
| 20 | Vanguard Portfolio Management, LLC | 0.68% | 195K | $9.8M | +42,843 (+28.2%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 2.7M shares and 3 cut 163K.
ETON top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.44% | 697K | $35.1M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.42% | 691K | $34.8M | −7,936 (−1.1%) | September 30, 2026 |
| 3 | Oberweis Micro-Cap | 1.69% | 484K | $24.3M | +63,000 (+15.0%) | June 30, 2026 |
| 4 | Fidelity Small Cap Index | 1.02% | 292K | $14.7M | +2,883 (+1.0%) | July 31, 2026 |
| 5 | Fidelity Small Cap Growth | 0.89% | 253K | $12.7M | +252,960 (0.0%) | July 31, 2026 |
| 6 | iShares Russell 2000 Growth ETF | 0.87% | 250K | $12.6M | −316 (−0.1%) | September 30, 2026 |
| 7 | Nuveen Quant Small Cap Equity R6 | 0.79% | 226K | $11.4M | −27,400 (−10.8%) | August 31, 2026 |
| 8 | State Street® SPDR® S&P® PhrmctlsETF | 0.62% | 177K | $8.9M | −2,200 (−1.2%) | September 30, 2026 |
| 9 | Vanguard Russell 2000 ETF | 0.54% | 153K | $7.7M | +3,713 (+2.5%) | August 31, 2026 |
| 10 | Schwab US Small-Cap ETF™ | 0.50% | 143K | $7.2M | +90 (+0.1%) | September 30, 2026 |
| 11 | Fidelity Small Cap Growth K6 | 0.46% | 132K | $6.6M | +131,980 (0.0%) | July 31, 2026 |
| 12 | Fidelity Extended Market Index | 0.40% | 114K | $5.7M | −2,181 (−1.9%) | August 31, 2026 |
| 13 | Rockefeller US Sm Cp Eq Impr F USDAccUnh | 0.39% | 113K | $5.7M | +15,956 (+16.5%) | September 30, 2026 |
| 14 | Wasatch Micro Cap | 0.32% | 92K | $4.6M | +91,924 (0.0%) | June 30, 2026 |
| 15 | iShares Micro-Cap ETF | 0.29% | 84K | $4.2M | −581 (−0.7%) | September 30, 2026 |
| 16 | Fidelity® SAI Small-Mid Cap Momt Idx | 0.25% | 73K | $3.7M | +2,101 (+3.0%) | August 31, 2026 |
| 17 | Schwab Small Cap Index | 0.23% | 65K | $3.3M | +620 (+1.0%) | August 31, 2026 |
| 18 | Principal US Small Cap ETF | 0.21% | 61K | $3.1M | +30 (+0.0%) | September 30, 2026 |
| 19 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.19% | 54K | $2.7M | +2,560 (+5.0%) | August 31, 2026 |
| 20 | iShares Russell 2000 Small-Cap Idx Instl | 0.17% | 50K | $2.5M | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ETON insider transactions
latest 5| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-08-20 | James R Gruber | Sell | $16.02 | 2,631 | $42,149 |
| 2025-08-19 | James R Gruber | Sell | $16.16 | 39,082 | $631,565 |
| 2025-06-16 | David Krempa | Sell | $14.73 | 10,223 | $150,585 |
| 2025-06-13 | David Krempa | Sell | $14.77 | 6,800 | $100,436 |
| 2025-06-12 | David Krempa | Sell | $14.92 | 16,977 | $253,297 |
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.
ETON shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ETON
Institutional investors own 71.3% of Eton Pharmaceuticals's shares and insiders 4.89%. The largest holder is Opaleye Management Inc with 10.01% of the shares (2.9M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 3 reduced their stake in the latest filings. Short interest is 8.87% of the float, or 3.32 days of average trading volume. The share count rose 651.6% since 2017.
Related: ETON analyst forecast, ETON key metrics. See the ETON stock overview for the latest quote and news.
ETON ownership FAQ
Who owns the most Eton Pharmaceuticals stock?
The largest shareholders of Eton Pharmaceuticals are Opaleye Management Inc (10.01%), Nantahala Capital Management, LLC (8.23%), EcoR1 Capital, LLC (7.60%), BlackRock Inc (6.63%), Vanguard Capital Management, LLC (3.42%).
What percentage of Eton Pharmaceuticals is owned by institutions?
Institutions hold 71.3% of Eton Pharmaceuticals's shares outstanding; insiders hold 4.89%.
Which funds own Eton Pharmaceuticals?
The largest fund holders of Eton Pharmaceuticals are Vanguard MStar Total Stk Mkt Idx Invest (2.44%), iShares Russell 2000 ETF (2.42%), Oberweis Micro-Cap (1.69%), Fidelity Small Cap Index (1.02%), Fidelity Small Cap Growth (0.89%).
What is Eton Pharmaceuticals's short interest?
1.8M shares of Eton Pharmaceuticals were sold short, 8.87% of the float; at the average daily volume it would take 3.32 days to cover.
Are insiders buying or selling Eton Pharmaceuticals?
Of the latest 5 reported insider transactions in Eton Pharmaceuticals (since June 12, 2025), 0 were purchases and 5 were sales.
How many shares of Eton Pharmaceuticals are outstanding?
Eton Pharmaceuticals has 28.6M shares outstanding, of which 22.3M are in the public float.