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ONCO · NASDAQ · Biotechnology

Onconetix (ONCO)

Prostate-cancer diagnostics developer centered on the Proclarix blood test.

$0.6847
Pre-market−0.00 (−0.04%)
At close$0.6850(+4.93%)
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Breakdown13F · 13D/G · Form 4

Institutions5 holders · as of Mar 31, 20260.04%1.7K shares
Insiders8 holders · as of Aug 19, 20250.01%356 shares
Strategic holders3 holders · as of Jul 27, 20265.89%232.5K shares
Otherremainder94.06%3.71M shares

3.95M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Two share counts disagree (3.95M in the company's Sep 3, 2026 report, 3.58M elsewhere); stakes use the report.

A stock split fell inside the quarter, so quarter-on-quarter changes are not shown.

Top shareholders13F · 13D/G · Form 4

HolderStakeSharesEvidence
Keystone Capital Partners, LLCStrategic
5.67%223,71713Gfiled Jul 27, 2026 ↗
Altos Venture AGStrategic10 percent owner
0.14%5,465Form 4filed Jul 16, 2025 ↗
HRT Financial LPStrategic10 percent owner
0.09%3,365Form 4filed Apr 22, 2026 ↗
Geode Capital Management, LLCInstitution
0.03%11,85413Fas of Mar 31, 2026
Citigroup IncInstitution
0.00%1,71713Fas of Mar 31, 2026
Ralph Schiess1Insiderofficer: Interim CEO, CSO
0.00%158Form 4filed Jan 22, 2025 ↗
UBS Group AGInstitution
0.00%1,58013Fas of Mar 31, 2026
Tower Research Capital LLC (TRC)Institution
0.00%1,45413Fas of Mar 31, 2026
Christian Bruhlmann2Insiderofficer: Chief Strategy Officer
0.00%144Form 4filed Jan 22, 2025 ↗
Timothy R. RamdeenInsiderdirector
0.00%13Form 4filed Aug 19, 2025 ↗
Simon TarshInsiderdirector
0.00%13Form 4filed Aug 19, 2025 ↗
Thomas MeierInsiderdirector
0.00%13Form 4filed Aug 19, 2025 ↗
Andrew John OakleyInsiderdirector
0.00%13Form 4filed Aug 19, 2025 ↗
Sbi Securities Co., Ltd.Institution
0.00%12013Fas of Mar 31, 2026
James SapirsteinInsiderdirector
0.00%1Form 4filed Sep 30, 2024 ↗
Ajit SinghInsiderdirector
0.00%1Form 4filed Sep 30, 2024 ↗
New Horizon Health LimitedStrategic
—6.91% of class, as filed—13Gfiled Sep 26, 2024 ↗
Zurcher Kantonalbank (zurich Cantonalbank)Insider
—6.80% of class, as filed—13Gfiled Nov 14, 2024 ↗
  1. Reported at 4.63% on Feb 14, 2025, under the 5% line, so no further filing is required.
  2. Reported at 4.20% on Feb 14, 2025, under the 5% line, so no further filing is required.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Mar 31, 2026

5 holders · 16.7K shares

HolderShares% outstandingChg q/qFiled
Geode Capital Management, LLC11.9K0.30%May 15, 2026
Citigroup Inc1.7K0.04%May 11, 2026
UBS Group AG1.6K0.04%May 5, 2026
Tower Research Capital LLC (TRC)1.5K0.04%May 15, 2026
Sbi Securities Co., Ltd.1200.00%Apr 28, 2026

Ownership statements13D/G · 5% or more, as filed

Holder% of classSharesFormFiled
Altos Venture AG35.80%13DJul 16, 2025 ↗
New Horizon Health Limited6.91%13GSep 26, 2024 ↗
Zurcher Kantonalbank6.80%13GNov 14, 2024 ↗
Keystone Capital Partners, LLC6.10%223.7K13GJul 27, 2026 ↗

Insider tradesForm 4

Latest trades

DateInsiderTypeSharesAvg priceOwned after
Apr 21, 2026
HRT Financial LP10 percent owner
Sale49,710$0.690033,649
Apr 20, 2026
HRT Financial LP10 percent owner
Sale94,462$0.750083,359
Apr 16, 2026
HRT Financial LP10 percent owner
Sale53,867$0.7300143,185
Apr 17, 2026
HRT Financial LP10 percent owner
Purchase34,636$0.7300177,821
Apr 14, 2026
HRT Financial LP10 percent owner
Purchase74,350$0.7700104,498
Apr 15, 2026
HRT Financial LP10 percent owner
Purchase92,554$0.7600197,052

CongressHouse and Senate disclosures

Not reported.