What does CUSIP G0509J115 represent in this 13F holders report?

CUSIP G0509J115 is the security identifier for AACB - Artius II Acquisition Inc. - Class A Common Stock used to aggregate holder disclosures.

How many institutions held AACB - Artius II Acquisition Inc. - Class A Common Stock in Q4 2025?

47 institutional investors reported AACB - Artius II Acquisition Inc. - Class A Common Stock for Q4 2025. Use the holders table for investor-level position and value details.

Artius II Acquisition Inc. - Class A Common Stock (AACB)

CUSIP: G0509J115

Q4 2025 13F Holders as of 31 Dec 2025

Type / Class: Equity / Class A Common Stock
Shares outstanding: 22,189,349
Total 13F shares: 20,880,226
Share change: -221,776
Total reported value: $215,043,524
Price per share: $10.30
Number of holders: 47
Value change: -$2,282,434
Number of buys: 14
Number of sells: 11

Security key

G0509J115

Report period

Q4 2025

Institutions

Top holders

AACB full security history Ownership snapshot Full 13F holder table Newer quarter: Q1 2026 Previous quarter: Q3 2025 Artius II Acquisition Inc. SEC filings Artius II Acquisition Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP G0509J115

Newer quarter: Q1 2026 Previous quarter: Q3 2025

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025 Q2 2025

Ownership snapshot

Top shareholders of AACB - Artius II Acquisition Inc. - Class A Common Stock (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Lead holder

Artius II Acquisition Par...

13D/G signal

Artius II Acquisition Par...

Evidence rows

Latest as of

30 Sep 2025

13D/G 3/4/5 13F Lead comparable stake: 20% 13D/G row: Artius II Acquisition Partners LLC Showing first 8 of 50 holder rows. Open remaining rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Artius II Acquisition Partners LLC	13D/G 3/4/5 10%+ Owner 13D/G 3/4/5	20%	$56,069,000 5,675,000 shares	$0	14 Feb 2025
HGC Investment Management Inc.	13F 13D/G Company 13F 13D/G	6.8% from 13D/G	$15,615,000 3,000,000 shares mixed-class rows	—	30 Sep 2025
AQR CAPITAL MANAGEMENT LLC	13D/G 13D/G	6.4%	$15,202,315 1,502,205 shares	-$4,835,285	30 Jun 2025
GLAZER CAPITAL, LLC	13D/G 13F Company 13D/G 13F	5.5%	$12,284,133 1,218,664 shares	$0	31 Mar 2025
Sculptor Capital LP	13F 13D/G Company 13F 13D/G	4.5% from 13D/G	$10,635,400 2,980,000 shares mixed-class rows	—	30 Sep 2025
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	13F 13D/G Company 13F 13D/G	3.8% from 13D/G	$20,740,000 4,000,000 shares mixed-class rows	—	30 Sep 2025
Polar Asset Management Partners Inc.	13F 13D/G Company 13F 13D/G	3.6% from 13D/G	$10,530,000 2,500,000 shares mixed-class rows	—	30 Sep 2025
Westchester Capital Management, LLC	13F Company 13F	4.5%	$10,088,862 995,939 shares	—	30 Sep 2025

Show 42 additional holder rows in the full holder list

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
TWO SIGMA INVESTMENTS, LP	13F Company 13F	3.3%	$7,344,250 725,000 shares	—	30 Sep 2025
D. E. Shaw & Co., Inc.	13F Company 13F	2.7%	$6,078,000 600,000 shares	—	30 Sep 2025
Jain Global LLC	13F Company 13F	2.3%	$5,065,000 500,000 shares	—	30 Sep 2025
GOLDMAN SACHS GROUP INC	13F Company 13F	2.1%	$4,688,113 462,795 shares	—	30 Sep 2025
MANGROVE PARTNERS IM, LLC	13F Company 13F	2%	$4,581,000 450,000 shares	—	30 Sep 2025
LMR Partners LLP	13F Company 13F	1.8%	$4,140,000 400,000 shares	—	30 Sep 2025
First Trust Capital Management L.P.	13F Company 13F	1.7%	$3,868,400 380,000 shares	—	30 Sep 2025
Governors Lane LP	13F Company 13F	1.1%	$2,537,500 250,000 shares	—	30 Sep 2025
OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC)	13F Company 13F	0.72%	$1,620,800 160,000 shares	—	30 Sep 2025
MIZUHO SECURITIES USA LLC	13F Company 13F	0.68%	$1,500,180 150,018 shares	—	30 Sep 2025
WOLVERINE ASSET MANAGEMENT LLC	13F Company 13F	0.3%	$674,941 66,628 shares	—	30 Sep 2025
DLD Asset Management, LP	13F Company 13F	0.18%	$416,301 40,894 shares	—	30 Sep 2025
Virtu Financial LLC	13F Company 13F	0.06%	$133,000 13,112 shares	—	30 Sep 2025
FNY Investment Advisers, LLC	13F Company 13F	0%	$3,000 322 shares	—	30 Sep 2025
UBS Group AG	13F Company 13F	0%	$2,463 238 shares	—	30 Sep 2025
MORGAN STANLEY	13F Company 13F	0%	$790 78 shares	—	30 Sep 2025
Boon Sim	3/4/5 CEO, CFO, Director, 10%+ Owner 3/4/5	— class O/S missing	— 175,000 shares	—	12 Feb 2025
AQR Arbitrage LLC	13F Company 13F	— mixed-class rows	$15,570,977 3,470,205 shares mixed-class rows	—	30 Sep 2025
LINDEN ADVISORS LP	13F Company 13F	— mixed-class rows	$10,439,375 2,375,000 shares mixed-class rows	—	30 Sep 2025
Alberta Investment Management Corp	13F Company 13F	— mixed-class rows	$10,162,600 1,960,000 shares mixed-class rows	—	30 Sep 2025
PICTON MAHONEY ASSET MANAGEMENT	13F Company 13F	— mixed-class rows	$7,728,000 1,250,000 shares mixed-class rows	—	30 Sep 2025
Radcliffe Capital Management, L.P.	13F Company 13F	— mixed-class rows	$6,851,310 675,006 shares mixed-class rows	—	30 Sep 2025
Magnetar Financial LLC	13F Company 13F	— mixed-class rows	$6,222,000 1,200,000 shares mixed-class rows	—	30 Sep 2025
MOORE CAPITAL MANAGEMENT, LP	13F Company 13F	— mixed-class rows	$5,210,000 1,000,000 shares mixed-class rows	—	30 Sep 2025
HBK INVESTMENTS L P	13F Company 13F	— mixed-class rows	$5,209,980 999,998 shares mixed-class rows	—	30 Sep 2025
PERISCOPE CAPITAL INC.	13F Company 13F	— mixed-class rows	$4,433,170 607,800 shares mixed-class rows	—	30 Sep 2025
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS	13F Company 13F	— mixed-class rows	$4,147,738 798,909 shares mixed-class rows	—	30 Sep 2025
BERKLEY W R CORP	13F Company 13F	— mixed-class rows	$4,048,496 521,010 shares mixed-class rows	—	30 Sep 2025
Shaolin Capital Management LLC	13F Company 13F	— mixed-class rows	$3,964,476 1,121,756 shares mixed-class rows	—	30 Sep 2025
RIVERNORTH CAPITAL MANAGEMENT, LLC	13F Company 13F	— mixed-class rows	$3,103,675 599,744 shares mixed-class rows	—	30 Sep 2025
Schonfeld Strategic Advisors LLC	13F Company 13F	— mixed-class rows	$2,457,579 484,826 shares mixed-class rows	—	30 Sep 2025
MILLENNIUM MANAGEMENT LLC	13F Company 13F	— mixed-class rows	$2,204,000 900,000 shares mixed-class rows	—	30 Sep 2025
GRITSTONE ASSET MANAGEMENT LLC	13F Company 13F	— mixed-class rows	$2,059,575 395,311 shares mixed-class rows	—	30 Sep 2025
TORONTO DOMINION BANK	13F Company 13F	— mixed-class rows	$1,769,112 1,158,800 shares mixed-class rows	—	30 Sep 2025
Context Capital Management, LLC	13F Company 13F	— mixed-class rows	$1,176,043 274,382 shares mixed-class rows	—	30 Sep 2025
Centiva Capital, LP	13F Company 13F	— mixed-class rows	$1,037,000 200,000 shares mixed-class rows	—	30 Sep 2025
Clear Street Group Inc.	13F Company 13F	— mixed-class rows	$909,000 312,714 shares mixed-class rows	—	30 Sep 2025
ATW SPAC MANAGEMENT LLC	13F Company 13F	— mixed-class rows	$796,793 200,632 shares mixed-class rows	—	30 Sep 2025
BOOTHBAY FUND MANAGEMENT, LLC	13F Company 13F	— mixed-class rows	$793,280 200,632 shares mixed-class rows	—	30 Sep 2025
Verition Fund Management LLC	13F Company 13F	— mixed-class rows	$603,074 201,103 shares mixed-class rows	—	30 Sep 2025
Harraden Circle Investments, LLC	13F Company 13F	— class O/S missing	$125,640 523,500 shares	—	30 Sep 2025
Decagon Asset Management LLP	13F Company 13F	— class O/S missing	$85,248 355,203 shares	—	30 Sep 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

20,880,226

Rows loaded

Investor	Option	Weight %	Change %	Reported value	* Price	Shares	Share Change	Activity	Report Period

* Reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. An asterisk next to the price means the price is likely invalid.

Compare Q4 2025 vs Q3 2025 Across Filers

Q3 2025 holders

Q4 2025 holders

Holder diff

Investor	Q3 2025 Shares	Q4 2025 Shares	Share Diff	Share Chg %	Q3 2025 value	Q4 2025 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend