Security key
68237Q203
Onconetix, Inc. - Common Stock, par value $0.00001 per share (ONCO)
CUSIP: 68237Q203
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock, par value $0.00001 per share
- Total 13F shares
- 61,061
- Total 13F value
- $95,255
- Share change
- -36,596
- SEC-reported price per share
- $1.56
- Number of holders
- 7
- Value change
- -$101,471
- Number of buys
- 3
- Number of sells
- 3
- Shares outstanding
- 763,212
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
7
Top holders
7
ONCO full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
Onconetix, Inc. SEC filings
Onconetix, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 68237Q203
Recent filing periods:
Ownership snapshot
Top reported holders of ONCO - Onconetix, Inc. - Common Stock, par value $0.00001 per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Altos Venture AG
Disclosed value leader
Altos Venture AG
Comparable rows
15/15
Latest evidence
30 Sep 2025
13D/G
3/4/5
13F
Lead comparable stake: 36%
13D/G row: Altos Venture AG
Showing 1-6 of 15 holder rows.
Quick read
Altos Venture AG leads the comparable SEC ownership view at 36%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Altos Venture AG's linked filing trail.
Comparable ownership
Top 5
Altos Venture AG
36%
Ralph Schiess
4.6%
Christian Bruhlmann
4.2%
Zurcher Kantonalbank (Zurich Cant...
2.5%
Simon Tarsh
0.09%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Altos Venture AG |
13D/G
3/4/5
10%+ Owner
|
36%
|
$1,307,597
273,230 shares
|
$0 | 14 Jul 2025 |
| Ralph Schiess |
3/4/5
13D/G
Interim CEO, CSO
|
4.6%
from 13D/G
|
$1,106,888
673,365 shares
|
— | 20 Dec 2024 |
| Christian Bruhlmann |
3/4/5
13D/G
Chief Strategy Officer
|
4.2%
from 13D/G
|
$968,521
611,372 shares
|
— | 20 Dec 2024 |
| Zurcher Kantonalbank (Zurich Cantonalbank) |
13D/G
|
2.5%
|
$16,615
207,691 shares
|
$0 | 24 Dec 2024 |
| Simon Tarsh |
3/4/5
Director
|
0.09%
|
$2,112
658 shares
|
— | 15 Aug 2025 |
| Timothy R. Ramdeen |
3/4/5
Director
|
0.09%
|
$2,112
658 shares
|
— | 15 Aug 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
7
Shares
61,061
Rows available
7
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
8
Q4 2025 holders
7
Holder diff
-1
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend