Ten percent holder HRT Financial cuts Onconetix (ONCO) stake

Rhea-AI Filing Summary

HRT Financial LP, a ten percent owner of Onconetix, Inc., reported an open-market sale of 49,710 Class A Shares at $0.69 per share. After this transaction, HRT Financial LP directly holds 33,649 Class A Shares of Onconetix.

This Form 4 reflects a net reduction in HRT Financial LP’s position, with no derivative securities reported as remaining holdings in this filing.

Insights

Equity analyst

Large holder executes open-market sale but retains meaningful stake.

HRT Financial LP, identified as a ten percent owner of Onconetix, Inc., completed an open-market sale of 49,710 Class A Shares at $0.69 per share. The filing shows this as a straightforward secondary-market transaction.

Following the sale, HRT Financial LP holds 33,649 Class A Shares directly. The filing lists no remaining derivative positions in the derivativeSummary, so this snapshot focuses on common share ownership. Actual significance for the company’s stock depends on overall share count and any future transactions disclosed in later filings.

Insider Trade Summary

Net Seller: 49,710 shares ($34,300)

Net Sell 1 txn

Insider HRT FINANCIAL LP

Role null

Sold 49,710 shs ($34K)

Type	Security	Shares	Price	Value
Sale	Class A Shares	49,710	$0.69	$34K

Holdings After Transaction: Class A Shares — 33,649 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 49,710 shares Sale price per share: $0.69 per share Shares owned after sale: 33,649 shares +2 more

5 metrics

Shares sold 49,710 shares Open-market sale of Onconetix Class A Shares

Sale price per share $0.69 per share Price for the 49,710 Class A Shares sold

Shares owned after sale 33,649 shares Onconetix Class A Shares directly held post-transaction

Transaction code S Sale in open market or private transaction

Net buy/sell shares -49,710 shares Net effect of reported transactions in this Form 4

Key Terms

open-market sale, ten percent owner, Class A Shares, Form 4

4 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

ten percent owner regulatory

""is_ten_percent_owner": 1"

Class A Shares financial

""security_title": "Class A Shares""

Class A shares are one of a company’s distinct types of stock that come with a specific set of rights—commonly different voting power, dividend treatment, or transfer rules—defined in the company’s charter. Investors care because those rights affect control, income and resale value; like holding a seat at a table that has different rules or stronger chips than other seats, owning Class A changes how much influence and return you can expect.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HRT FINANCIAL LP

(Last) (First) (Middle)

3 WORLD TRADE CENTER, 175 GREENWICH STRE

76TH FLOOR

(Street)

NEW YORK NEW YORK 10007

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Onconetix, Inc. [ ONCO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Shares	04/21/2026		S		49,710	D	$0.69	33,649	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	Adam Nunes	04/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did HRT Financial LP report for Onconetix (ONCO)?

HRT Financial LP reported an open-market sale of 49,710 Onconetix Class A Shares. The sale was executed at a price of $0.69 per share, according to the Form 4 insider trading report filed for this transaction.

At what price did HRT Financial LP sell Onconetix (ONCO) shares?

The filing shows HRT Financial LP sold Onconetix Class A Shares at $0.69 per share. This price applies to the 49,710 shares reported in the open-market sale, as disclosed in the Form 4 transaction details.

How many Onconetix (ONCO) shares does HRT Financial LP hold after the sale?

After the reported transaction, HRT Financial LP directly holds 33,649 Onconetix Class A Shares. This post-transaction balance is disclosed as the total shares beneficially owned following the open-market sale in the Form 4.

Was the HRT Financial LP Onconetix (ONCO) trade a buy or a sell?

The Form 4 classifies HRT Financial LP’s transaction as a sell. It uses transaction code “S” and describes the move as an open-market sale of 49,710 Class A Shares of Onconetix at $0.69 per share.

Does HRT Financial LP have any Onconetix (ONCO) derivatives reported in this Form 4?

This Form 4 shows no derivative securities for HRT Financial LP. The derivative summary section is empty, indicating the filing only reports the common stock sale and resulting direct holdings of 33,649 Class A Shares.