Ranked by reported Q4 2025 13F market value
Share of total reported institutional value in ONCO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | XTX Topco Ltd | 11K | $17K | — | 1.723% | 0.00% |
| 2 | UBS Group AG | 9K | $14K | +67.1% | 1.464% | 0.00% |
| 3 | Tower Research Capital LLC (TRC) | 2K | $3K | +16.0% | 0.289% | 0.00% |
| 4 | SBI Securities Co., Ltd. | 154 | $240 | 0.0% | 0.025% | 0.00% |
| 5 | BANK OF AMERICA CORP /DE/ | 11 | $17 | 0.0% | 0.002% | 0.00% |
| 6 | DANSKE BANK A/S | 1 | $2 | 0.0% | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ONCO — a direct measure of their conviction.
Filings activity in ONCO during Q4 2025, grouped by how each filer changed its position.
Institutions that fully closed their ONCO position in Q4 2025
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q4 2025 | 6 | 14% | 5.25% | 11.82 pp | $0M | 69% |
| Q3 2025 | 7 | +0.0% | 17.07% | +10.49 pp | $0M | +160% |
| Q2 2025 | 7 | 50% | 6.58% | +4.49 pp | $0M | +214% |
| Q1 2025 | 14 | +7.7% | 2.09% | 34.89 pp | $0M | 94% |
| Q4 2024 | 13 | +44% | 36.98% | +13.19 pp | $0M | +55% |
| Q3 2024 | 9 | 55% | 23.79% | 11.10 pp | $0M | 32% |
| Q2 2024 | 20 | +18% | 34.89% | +13.99 pp | $0M | +67% |
| Q1 2024 | 17 | — | 20.90% | — | $0M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Apr 14, 2026 | HRT FINANCIAL LP | Buy | 74K | $0.77 | $57K |
Quick answers to the most common questions about buying ONCO stock.
Based on Q4 2025 13F filings, institutional ownership of Onconetix, Inc. stands at 5.3%, held across 6 reporting institutions.
XTX Topco Ltd is the largest reported institutional holder of ONCO, with approximately 10,827 shares worth $0.00B as of Q4 2025.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ONCO.
Our composite Smart Money Score for ONCO is 18 out of 100 (Heavy Distribution). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
1 institutions opened new positions in ONCO during Q4 2025, while 2 fully exited. 0 added to existing positions and 5 trimmed.
ONCO institutional ownership fell by 11.82 percentage points quarter-over-quarter, with a net change of -1 holders.
The top 10 institutions account for 100.0% of all reported 13F value in ONCO, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Onconetix, Inc. (ONCO) Institutional Ownership