HRT Financial LP trims Onconetix (ONCO) stake with net share sales

Rhea-AI Filing Summary

HRT Financial LP, a ten percent owner of Onconetix, Inc., reported several open-market trades in Class A Shares. On April 16, 2026 and April 20, 2026 it sold a total of 148,329 shares at about $0.73–$0.75 per share, and on April 17, 2026 it purchased 34,636 shares at $0.73. Overall, this was a net sale of 113,693 shares, leaving HRT Financial LP with 83,359 Class A Shares held directly after the last reported transaction.

Insider Trade Summary

Net Seller: 113,693 shares ($110,169)

Net Sell 3 txns

Insider HRT FINANCIAL LP

Role null

Bought 34,636 shs ($25K)

Sold 148,329 shs ($110K)

Type	Security	Shares	Price	Value
Sale	Class A Shares	94,462	$0.75	$71K
Purchase	Class A Shares	34,636	$0.73	$25K
Sale	Class A Shares	53,867	$0.73	$39K

Holdings After Transaction: Class A Shares — 83,359 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 148,329 shares Shares bought: 34,636 shares Net share change: 113,693 shares +3 more

6 metrics

Shares sold 148,329 shares Total Class A Shares sold in open-market transactions

Shares bought 34,636 shares Class A Shares purchased on April 17, 2026

Net share change 113,693 shares Net sale across reported trades

Sale price (Apr 20, 2026) $0.75 per share Open-market sale of 94,462 Class A Shares

Trade price (Apr 16–17, 2026) $0.73 per share Used for both sale and purchase transactions

Shares after final trade 83,359 shares Direct Class A Shares held after April 20, 2026 sale

Key Terms

open-market sale, open-market purchase, ten percent owner, Class A Shares, +1 more

5 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.

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.

ten percent owner financial

"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

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	04/16/2026		S		53,867	D	$0.73	143,185	D
Class A Shares	04/17/2026		P		34,636	A	$0.73	177,821	D
Class A Shares	04/20/2026		S		94,462	D	$0.75	83,359	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	04/21/2026
	** 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 transactions did HRT Financial LP report for Onconetix (ONCO)?

HRT Financial LP reported a series of open-market trades in Onconetix Class A Shares, including one purchase and two sales. These transactions occurred between April 16 and April 20, 2026, reflecting active trading around the same price range.

How many Onconetix (ONCO) shares did HRT Financial LP sell and buy?

HRT Financial LP sold 148,329 Onconetix Class A Shares and bought 34,636 shares. This produced a net sale of 113,693 shares over the disclosed period, based on the share totals explicitly listed for each transaction.

At what prices did HRT Financial LP trade Onconetix (ONCO) shares?

HRT Financial LP sold Onconetix Class A Shares at $0.75 and $0.73 per share and bought shares at $0.73 per share. All trades were reported as open-market transactions under standard Form 4 transaction codes.

What is HRT Financial LP’s remaining Onconetix (ONCO) stake after these trades?

After the latest reported sale on April 20, 2026, HRT Financial LP held 83,359 Onconetix Class A Shares directly. This figure comes from the post-transaction ownership field shown for the final transaction in the filing.

Were any derivative securities involved in HRT Financial LP’s Onconetix (ONCO) Form 4?

No derivative securities are listed in this Form 4. All reported transactions involve non-derivative Class A Shares, and the derivative position summary in the data shows zero derivative transactions and no remaining derivative holdings.

Is HRT Financial LP considered a major shareholder of Onconetix (ONCO)?

HRT Financial LP is identified in the filing as a ten percent owner of Onconetix. This status means it holds, or has been reported as holding, at least ten percent of a registered class of the company’s equity securities.