Polar Asset discloses 3.6% Artius II (AACB) stake in 13G/A filing

Rhea-AI Filing Summary

Polar Asset Management Partners Inc. filed an amended Schedule 13G reporting beneficial ownership of 812,332 Class A ordinary shares of Artius II Acquisition Inc., representing 3.6% of the class as of 12/31/2025.

Polar, a Canadian investment adviser, holds sole voting and dispositive power over these shares, which are directly held by Polar Multi-Strategy Master Fund. The filing states the securities were acquired and are held in the ordinary course of business, not to change or influence control of Artius II Acquisition Inc.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Artius II Acquisition Inc.

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G0509J115

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G0509J115

1

Names of Reporting Persons

Polar Asset Management Partners Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 812,332.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 812,332.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

812,332.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.6 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Artius II Acquisition Inc.
(b)	Address of issuer's principal executive offices: 3 Columbus Circle, Suite 1609, New York, NY 10019
Item 2.
(a)	Name of person filing: This statement is filed by Polar Asset Management Partners Inc., a company incorporated under the laws of Ontario, Canada, which serves as the investment advisor to Polar Multi-Strategy Master Fund, a Cayman Islands exempted company ("PMSMF") with respect to the shares directly held by PMSMF.
(b)	Address or principal business office or, if none, residence: 16 York Street, Suite 2900, Toronto, Ontario, M5J 0E6
(c)	Citizenship: Canada
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G0509J115
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
	The Reporting Person is an investment fund manager, portfolio manager, exempt market dealer and commodity trading manager registered with the Ontario Securities Commission.
Item 4.	Ownership
(a)	Amount beneficially owned: 812332
(b)	Percent of class: 3.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 812332
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 812332
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Polar Asset Management Partners Inc.

Signature:	Andrew Ma
Name/Title:	Chief Compliance Officer
Date:	02/17/2026

FAQ

What stake in Artius II Acquisition Inc. (AACB) does Polar Asset Management report?

Polar Asset Management Partners Inc. reports beneficial ownership of 812,332 Class A shares of Artius II Acquisition Inc., representing 3.6% of the class as of 12/31/2025, according to its amended Schedule 13G filing.

What type of securities in AACB are covered in Polar Asset’s Schedule 13G/A?

The filing covers Class A ordinary shares of Artius II Acquisition Inc., each with a par value of $0.0001 per share. Polar reports its beneficial ownership and related voting and dispositive powers over these specific Class A ordinary shares.

Does Polar Asset Management seek to influence control of Artius II Acquisition Inc. (AACB)?

Polar Asset Management states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of Artius II Acquisition Inc., consistent with a passive investment under Schedule 13G.

How much voting and dispositive power over AACB shares does Polar report?

Polar reports sole voting power and sole dispositive power over 812,332 shares, with no shared voting or dispositive power. This means Polar alone can vote and decide on the disposition of these Artius II Acquisition Inc. shares.

Who actually holds the AACB shares reported by Polar Asset Management?

The shares are directly held by Polar Multi-Strategy Master Fund, a Cayman Islands exempted company. Polar Asset Management Partners Inc., based in Ontario, Canada, serves as the investment adviser to this fund and reports beneficial ownership on its behalf.

Why is Polar Asset Management eligible to file a Schedule 13G for AACB?

Polar files as an investment adviser, describing itself as an investment fund manager, portfolio manager, exempt market dealer, and commodity trading manager registered with the Ontario Securities Commission, which allows use of the Schedule 13G short-form beneficial ownership report.