Onconetix, Inc. (ONCO) Ownership
ONCO ownership summary
as of October 17, 2026- Institutions
- 5.5% of shares outstanding
- Insiders
- 0.13% of shares outstanding
- Shares outstanding
- 5.2M
- Float
- 3.9M shares available to trade
- Short interest
- 9.34% 490K shares short
- Days to cover
- 0.09 short interest up 261.8% vs prior month
- Institutions 5.52%
- Insiders 0.13%
- Other investors 94.35%
ONCO top institutional holders
12 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | HRT FINANCIAL LLC | 0.98% | 51K | $24,620 | +51,398 (0.0%) | June 30, 2026 |
| 2 | XTX Topco Ltd | 0.26% | 14K | $6,489 | +13,548 (0.0%) | June 30, 2026 |
| 3 | SBI Securities Co Ltd | <0.01% | 252 | $121 | +240 (+2,000.0%) | June 30, 2026 |
| 4 | Tower Research Capital LLC | <0.01% | 145 | $69 | — | June 30, 2026 |
| 5 | Hollencrest Securities, LLC | <0.01% | 100 | $48 | +100 (0.0%) | June 30, 2026 |
| 6 | Morgan Stanley - Brokerage Accounts | <0.01% | 21 | $10 | +21 (0.0%) | June 30, 2026 |
| 7 | DRW Securities, LLC | 0.00% | — | — | −39,046 (−100.0%) | March 31, 2026 |
| 8 | Danske Bank A/S. | 0.00% | — | — | −1 (−100.0%) | March 31, 2026 |
| 9 | Geode Capital Management, LLC | 0.00% | — | — | −1,185 (−100.0%) | June 30, 2026 |
| 10 | Citigroup Inc | 0.00% | — | — | −172 (−100.0%) | June 30, 2026 |
| 11 | Bank of America Corp | 0.00% | — | — | −11 (−100.0%) | March 31, 2026 |
| 12 | UBS Group AG | 0.00% | — | — | −158 (−100.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 12, 5 holders added 65K shares and 6 cut 41K.
ONCO top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.52% | 23K | $10,846 | +15,561 (+219.8%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ONCO insider transactions
latest 6| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-21 | Financial Lp Hrt | Sell | $0.69 | 49,710 | $34,300 |
| 2026-04-20 | Financial Lp Hrt | Sell | $0.75 | 94,462 | $70,846 |
| 2026-04-17 | Financial Lp Hrt | Buy | $0.73 | 34,636 | $25,284 |
| 2026-04-16 | Financial Lp Hrt | Sell | $0.73 | 53,867 | $39,323 |
| 2026-04-15 | Financial Lp Hrt | Buy | $0.76 | 92,554 | $70,341 |
| 2026-04-14 | Financial Lp Hrt | Buy | $0.77 | 74,350 | $57,250 |
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.
ONCO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ONCO
Institutional investors own 5.5% of Onconetix's shares and insiders 0.13%. The largest holder is HRT FINANCIAL LLC with 0.98% of the shares (51K), as of June 30, 2026. Among the top 12 institutions, 5 added shares and 6 reduced their stake in the latest filings. Short interest is 9.34% of the float, or 0.09 days of average trading volume. The share count rose 9.4% since 2020.
Related: ONCO key metrics. See the ONCO stock overview for the latest quote and news.
ONCO ownership FAQ
Who owns the most Onconetix stock?
The largest shareholders of Onconetix are HRT FINANCIAL LLC (0.98%), XTX Topco Ltd (0.26%), SBI Securities Co Ltd (<0.01%), Tower Research Capital LLC (<0.01%), Hollencrest Securities, LLC (<0.01%).
What percentage of Onconetix is owned by institutions?
Institutions hold 5.5% of Onconetix's shares outstanding; insiders hold 0.13%.
Which funds own Onconetix?
The largest fund holders of Onconetix are Fidelity Extended Market Index (0.52%).
What is Onconetix's short interest?
490K shares of Onconetix were sold short, 9.34% of the float; at the average daily volume it would take 0.09 days to cover.
Are insiders buying or selling Onconetix?
Of the latest 6 reported insider transactions in Onconetix (since April 14, 2026), 3 were purchases and 3 were sales.
How many shares of Onconetix are outstanding?
Onconetix has 5.2M shares outstanding, of which 3.9M are in the public float.