HOOPP discloses 3.8% Class A stake in Artius II Acquisition (AACB)

Rhea-AI Filing Summary

Healthcare of Ontario Pension Plan Trust Fund (HOOPP) filed an amended Schedule 13G reporting its beneficial ownership of Artius II Acquisition Inc. Class A ordinary shares. HOOPP holds 850,000 Class A shares, representing 3.8% of this share class, based on 22,175,000 shares outstanding as of November 6, 2025.

HOOPP reports sole voting and dispositive power over all 850,000 shares and no shared power. It certifies that 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.

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, $0.0001 par value

(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

Healthcare of Ontario Pension Plan Trust Fund

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

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 850,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 850,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

850,000.00

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)

3.8 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: In reference to Rows 5, 7 and 9 above, amount consists of Class A ordinary shares, $0.0001 par value ("Class A Shares"), of Artius II Acquisition Inc., a blank check company formed under the laws of the Cayman Islands (the "Issuer"). In reference to Row 11 above, percentage ownership is based on 22,175,000 Class A Shares issued and outstanding as of November 6, 2025, reported on the Issuer's quarterly report on Form 10-Q, filed with the Securities and Exchange Commission on November 7, 2025.

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: Healthcare of Ontario Pension Plan Trust Fund ("HOOPP")
(b)	Address or principal business office or, if none, residence: 1 York Street, Suite 1900, Toronto, Ontario, Canada, M5J 0B6
(c)	Citizenship: Ontario, Canada
(d)	Title of class of securities: Class A ordinary shares, $0.0001 par value
(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).
	A pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario.
Item 4.	Ownership
(a)	Amount beneficially owned: See Item 9 on page 2.
(b)	Percent of class: See Item 11 on page 2.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Item 5 on page 2.
	(ii) Shared power to vote or to direct the vote: See Item 6 on page 2.
	(iii) Sole power to dispose or to direct the disposition of: See Item 7 on page 2.
	(iv) Shared power to dispose or to direct the disposition of: See Item 8 on page 2.
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. By signing below I certify that, to the best of my knowledge and belief, the regulatory scheme applicable to a pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Securities and Exchange Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

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.

Healthcare of Ontario Pension Plan Trust Fund

Signature:	/s/ Abas Kanu
Name/Title:	Abas Kanu, VP, HOOPP Compliance Officer
Date:	02/13/2026

FAQ

How many Artius II Acquisition Inc. (AACB) shares does HOOPP own?

Healthcare of Ontario Pension Plan Trust Fund beneficially owns 850,000 Class A ordinary shares of Artius II Acquisition Inc. This stake is reported with sole voting and dispositive power, meaning HOOPP alone can vote and decide whether to sell or hold these shares.

What percentage of Artius II Acquisition Inc. (AACB) does HOOPP own?

HOOPP owns 3.8% of Artius II Acquisition Inc.’s Class A ordinary shares. This percentage is calculated using 22,175,000 Class A shares outstanding as of November 6, 2025, as disclosed in the company’s Form 10-Q filed November 7, 2025.

Is HOOPP trying to influence control of Artius II Acquisition Inc. (AACB)?

HOOPP states it is not seeking to change or influence control of Artius II Acquisition Inc. The filing certifies the shares were acquired and are held in the ordinary course of business, not in connection with any control-related transaction or campaign.

What type of investor is HOOPP in this Artius II Acquisition Inc. (AACB) filing?

HOOPP is described as a pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario. It certifies that its regulatory regime is substantially comparable to that of similar U.S. institutions.

What is the event date for HOOPP’s Schedule 13G/A on Artius II Acquisition Inc. (AACB)?

The event date triggering this amended Schedule 13G filing is December 31, 2025. That date reflects when the ownership status met the reporting criteria, and the amendment updates the market on HOOPP’s current beneficial holdings and percentage interest.

Does HOOPP share voting or dispositive power over Artius II Acquisition Inc. (AACB) shares?

No. HOOPP reports sole voting power and sole dispositive power over 850,000 Class A shares of Artius II Acquisition Inc., with zero shared voting power and zero shared dispositive power. This indicates exclusive authority over how these shares are voted and sold.