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AACB · NASDAQ · Shell Companies

Artius II Acquisition (AACB)

Seeks a technology-enabled business combination as a pre-combination SPAC.

$10.59

At close+0.01 (+0.09%)

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Breakdown13F · 13D/G · Form 4

Institutions52 holders · as of Mar 31, 2026	≥ 76.84%	21.27M shares
Strategic holders2 holders · as of May 8, 2025	26.33%	7.29M shares
Adds to	103.17%

27.68M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

Institutional filings for AACBR, AACBR (100% of the company) are not on file here, so the institutional figure is a floor.

These groups come from separate filings that can overlap, so they add to 103.17%; nothing is left for Other.

This company has 2 share classes; every stake here is a share of the whole company.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Artius II Acquisition Partners LLC¹Strategic10 percent owner	20.51%	175,000	13Gfiled Feb 14, 2025 ↗
Bank of MontrealStrategic	5.82%	1.61M	13Gfiled May 8, 2025 ↗
AQR Capital Management, LLCInstitution	5.43%	1.50M	13Gfiled Aug 14, 2025 ↗
HGC Investment Management Inc.Institution	5.42%	1.50M A	13Fas of Mar 31, 2026
AQR Arbitrage LLCInstitution	5.18%	1.43M A	13Fas of Mar 31, 2026
Glazer Capital, LLCInstitution	4.68%	1.30M A	13Fas of Mar 31, 2026
Linden Advisors LPInstitution	3.61%	1.00M A	13Fas of Mar 31, 2026
Westchester Capital Management, LLCInstitution	3.60%	995,939 A	13Fas of Mar 31, 2026
Alberta Investment Management CorpInstitution	3.54%	980,000 A	13Fas of Mar 31, 2026
Healthcare of Ontario Pension Plan Trust FundInstitution	3.07%	850,000 A	13Fas of Mar 31, 2026
Polar Asset Management Partners Inc.Institution	2.89%	800,000 A	13Fas of Mar 31, 2026
Picton Mahoney Asset ManagementInstitution	2.71%	750,000 A	13Fas of Mar 31, 2026
Two Sigma Investments, LPInstitution	2.62%	725,000 A	13Fas of Mar 31, 2026
Radcliffe Capital Management, L.P.Institution	2.45%	678,671 A	13Fas of Mar 31, 2026
D. E. Shaw & Co., Inc.Institution	2.17%	600,000 A	13Fas of Mar 31, 2026
Magnetar Financial LLCInstitution	2.17%	600,000 A	13Fas of Mar 31, 2026
Hudson Bay Capital Management LPInstitution	1.99%	550,000 A	13Fas of Mar 31, 2026
Shaolin Capital Management LLCInstitution	1.99%	550,000 A	13Fas of Mar 31, 2026
Moore Capital Management, LPInstitution	1.81%	500,000 A	13Fas of Mar 31, 2026
Sculptor Capital LPInstitution	1.81%	500,000 A	13Fas of Mar 31, 2026
HBK Investments L PInstitution	1.81%	499,998 A	13Fas of Mar 31, 2026
Goldman Sachs Group IncInstitution	1.67%	462,806 A	13Fas of Mar 31, 2026
Commonwealth of Pennsylvania Public School Empls Retrmt SYSInstitution	1.44%	398,075 A	13Fas of Mar 31, 2026
Berkley W R CorpInstitution	1.43%	396,960 A	13Fas of Mar 31, 2026
First Trust Capital Management L.P.Institution	1.37%	380,000 A	13Fas of Mar 31, 2026

The filed share classes (COMMON, B) could not be matched to the company's, so no percentage.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more

Institutions13F, as of Mar 31, 2026

52 holders · 21.27M shares · 6 new positions · 13 increased · 13 reduced · 1 closed

Holder	Shares	% of company	Chg q/q	Filed
HGC Investment Management Inc.	1.50M	5.42%	0	May 15, 2026
AQR Arbitrage LLC	1.43M	5.18%	−58.0K	May 15, 2026
Glazer Capital, LLC	1.30M	4.68%	+139.9K	May 14, 2026
Linden Advisors LP	1.00M	3.61%	0	May 15, 2026
Westchester Capital Management, LLC	995.9K	3.60%	0	May 15, 2026
Alberta Investment Management Corp	980.0K	3.54%	0	Apr 29, 2026
Healthcare of Ontario Pension Plan Trust Fund	850.0K	3.07%	0	May 14, 2026
Polar Asset Management Partners Inc.	800.0K	2.89%	−12.3K	May 15, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Artius II Acquisition Partners LLC	20.50%	5.68M	13G	Feb 14, 2025 ↗
Bank of Montreal	7.27%	1.61M	13G	May 8, 2025 ↗
HGC Investment Management Inc	6.76%	1.50M	13G	Feb 17, 2026 ↗
AQR Capital Management, LLC	6.35%	1.50M	13G	Aug 14, 2025 ↗
Polar Asset Management Partners Inc.	6.30%	1.50M	13G	May 15, 2025 ↗
Glazer Capital, LLC	5.54%	1.22M	13G	May 15, 2025 ↗

Artius II Acquisition (AACB)

Breakdown13F · 13D/G · Form 4

Top shareholders13F · 13D/G · Form 4

Institutions13F, as of Mar 31, 2026

Ownership statements13D/G · 5% or more, as filed

Insider tradesForm 4

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