HRT Financial LP boosts Onconetix (ONCO) stake with open-market share buys

Rhea-AI Filing Summary

Onconetix, Inc. major holder HRT FINANCIAL LP increased its stake with open-market purchases of Class A Shares. The investor bought 92,554 shares at $0.76 per share on April 15, 2026 and 74,350 shares at $0.77 per share on April 14, 2026. After these transactions, HRT FINANCIAL LP directly holds 197,052 Class A Shares, reflecting net buying activity over the two days.

Insider Trade Summary

Net Buyer: 166,904 shares ($127,591)

Net Buy 2 txns

Insider HRT FINANCIAL LP

Role 10% Owner

Bought 166,904 shs ($128K)

Type	Security	Shares	Price	Value
Purchase	Class A Shares	92,554	$0.76	$70K
Purchase	Class A Shares	74,350	$0.77	$57K

Holdings After Transaction: Class A Shares — 197,052 shares (Direct)

Footnotes (1)

Key Figures

Shares bought April 15, 2026: 92,554 shares at $0.76 Shares bought April 14, 2026: 74,350 shares at $0.77 Total shares bought: 166,904 shares +3 more

6 metrics

Shares bought April 15, 2026 92,554 shares at $0.76 Open-market purchase of Class A Shares

Shares bought April 14, 2026 74,350 shares at $0.77 Open-market purchase of Class A Shares

Total shares bought 166,904 shares Net buy across two open-market transactions

Holdings after latest trade 197,052 shares Direct Class A Shares after April 15, 2026 purchase

Higher purchase price $0.77 per share April 14, 2026 transaction price

Lower purchase price $0.76 per share April 15, 2026 transaction price

Key Terms

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

4 terms

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

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.

ten percent owner financial

"is_ten_percent_owner: 1"

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

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	04/14/2026		P		74,350	A	$0.77	104,498	D
Class A Shares	04/15/2026		P		92,554	A	$0.76	197,052	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	04/16/2026
	** 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 activity did HRT FINANCIAL LP report for Onconetix (ONCO)?

HRT FINANCIAL LP reported buying a total of 166,904 Class A Shares of Onconetix in the open market. The purchases occurred over two days at prices between $0.76 and $0.77 per share, increasing its direct holdings.

How many Onconetix (ONCO) shares does HRT FINANCIAL LP hold after these trades?

After the reported transactions, HRT FINANCIAL LP directly holds 197,052 Class A Shares of Onconetix. This figure reflects its ownership position following the most recent open-market purchase disclosed in the Form 4 filing.

At what prices did HRT FINANCIAL LP buy Onconetix (ONCO) shares?

HRT FINANCIAL LP bought Onconetix Class A Shares at $0.76 per share on April 15, 2026 and $0.77 per share on April 14, 2026. Both transactions were reported as open-market purchases in the Form 4.

How many Onconetix (ONCO) shares did HRT FINANCIAL LP purchase on each day?

HRT FINANCIAL LP purchased 92,554 Class A Shares on April 15, 2026 and 74,350 Class A Shares on April 14, 2026. Together, these open-market buys total 166,904 shares added to its direct position.

What is the overall direction of HRT FINANCIAL LP’s recent Onconetix (ONCO) trades?

The overall direction is a net buy. The Form 4 transaction summary shows two open-market purchase entries totaling 166,904 shares bought, with no reported sales, indicating increased exposure to Onconetix stock.