$ONCO

$0.49 +$0.02 (4.07%) Pre-market

$ONCO Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 3.9M shares outstanding

Who owns ONCO?

By type of holder

Institutions 1.7% Insiders 5.9% Everyone else 92.4%

Concentration Top 10 holders own 41.2%

Ralph Schiess 17.1% · Christian Bruhlmann 15.5%

Institutional ownership

1.7%

+1.7 pts vs last qtr

Institutional holders

+6 vs last qtr

Net shares bought

+65.5K

by institutions in Q2 2026

New / sold out

6 / 0

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

HRT Financial LP NEW +51.4K
XTX Topco Ltd NEW +13.5K

Biggest sellers in Q2 2026

None.

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Onconetix Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+2803.0%

+2802.98% a year

Each share's claim on the business

−96.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $513K

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years0% Under 1 year100%

Quarterly turnover

—

of institutional shares changed hands

Top 10 managers, median time held

0 quarters

Super Investors

Investment managers reporting ONCO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
HF HRT Financial LP	51.4K	1.30%	NEW	Q2 '26	0.0%
Shares held by quarter Peak holding143.4K (Q1'25) Change over 8 quarters+51.4K Share of the company1.300% HRT Financial LP's full portfolio →
XT XTX Topco Ltd	13.5K	0.34%	NEW	Q2 '26	0.0%
Shares held by quarter Peak holding13.5K (Q2'26) Change over 8 quarters+13.5K Share of the company0.340% XTX Topco Ltd's full portfolio →

HRT Financial LP

51.4K

% of company

1.30%

Change vs last qtr

NEW

Held since

Q2 '26

XTX Topco Ltd

13.5K

% of company

0.34%

Change vs last qtr

NEW

Held since

Q2 '26

4 more super investors behind a free account

See every manager holding Onconetix Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ONCO on Form N-PORT; together they hold 0.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FE Fidelity Extended Market Index Fund Fidelity Concord Street Trust	$14.2K	22.6K	0.57%	0.00%	August 31, 2026
BA Blackstone Alternative Multi-Strategy Fund Blackstone Alternative Investment Funds	$-7.45	—	0.00%	0.00%	March 31, 2026

Fidelity Extended Market Index Fund

Fidelity Concord Street Trust

Position value

$14.2K

% of company

0.57%

% of the fund

0.00%

As of

August 31, 2026

Blackstone Alternative Multi-Strategy Fund

Blackstone Alternative Investment Funds

Position value

$-7.45

% of company

0.00%

% of the fund

0.00%

As of

March 31, 2026

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
RS Ralph Schiess 5%+ holder 13D · 4.6%	673.4K	17.05%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company17.050% Disclosed stake13D · 4.6% View the 13D/G filing →
CB Christian Bruhlmann 5%+ holder 13D · 4.2%	611.4K	15.48%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company15.480% Disclosed stake13D · 4.2% View the 13D/G filing →

Ralph Schiess

5%+ holder13D · 4.6%

673.4K

% of company

17.05%

Change vs last qtr

—

Held since

—

Christian Bruhlmann

5%+ holder13D · 4.2%

611.4K

% of company

15.48%

Change vs last qtr

—

Held since

—

5 more holders behind a free account

See every insider and 5%+ holder of Onconetix Inc.

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