Latest Period
Q4 2025
Security Snapshot
Artius II Acquisition Inc. - Class A Common Stock (AACB) Institutional Ownership
CUSIP: G0509J115
13F Institutional Holders and Ownership History from Q2 2025 to Q1 2026
Institutions Reporting
47
Shares (Excl. Options)
20,880,226
Price
$10.30
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- Type / Class
- Equity / Class A Common Stock
- Symbol
- AACB on Nasdaq
- Shares outstanding
- 22,189,349
- Price per share
- $10.34
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 20,880,226
- Total reported value
- $215,043,524
- % of total 13F portfolios
- 0%
- Share change
- -221,776
- Value change
- -$2,282,434
- Number of holders
- 47
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- AACB - Artius II Acquisition Inc. - Class A Common Stock is tracked under CUSIP G0509J115.
- 47 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 47 to 8 between Q4 2025 and Q1 2026.
- Reported value moved from $215,043,524 to $21,138,145.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 47 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP G0509J115?
CUSIP G0509J115 identifies AACB - Artius II Acquisition Inc. - Class A Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G0509J115:
Significant Owners of Artius II Acquisition Inc. - Class A Common Stock (AACB) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Artius II Acquisition Partners LLC | 20% | $56,069,000 | 5,675,000 | Artius II Acquisition Partners LLC | 14 Feb 2025 | |||
| AQR CAPITAL MANAGEMENT LLC | 6.4% | -29% | $15,202,315 | -$4,835,285 | 1,502,205 | -24% | AQR Capital Management, LLC | 30 Jun 2025 |
| HGC Investment Management Inc. | 6.8% | $15,435,000 | 1,500,000 | HGC Investment Management Inc | 31 Dec 2025 | |||
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 3.8% | -52% | $8,746,500 | -$11,833,500 | 850,000 | -58% | Healthcare of Ontario Pension Plan Trust Fund | 31 Dec 2025 |
| Polar Asset Management Partners Inc. | 3.6% | $8,358,896 | 812,332 | Polar Asset Management Partners Inc. | 31 Dec 2025 |
As of 31 Dec 2025, 47 institutional investors reported holding 20,880,226 shares of Artius II Acquisition Inc. - Class A Common Stock (AACB). This represents 94% of the company’s total 22,189,349 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Artius II Acquisition Inc. - Class A Common Stock (AACB) together control 80% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| HGC Investment Management Inc. | 6.8% | 1,500,000 | 0% | 3.3% | $15,450,000 |
| AQR Arbitrage LLC | 6.7% | 1,490,205 | 0% | 0.32% | $15,349,112 |
| Glazer Capital, LLC | 5.2% | 1,155,161 | -3.3% | 0.31% | $11,898,000 |
| Linden Advisors LP | 4.5% | 1,000,000 | 0% | 0.06% | $10,300,000 |
| Westchester Capital Management, LLC | 4.5% | 995,939 | 0% | 0.48% | $10,258,172 |
| Alberta Investment Management Corp | 4.4% | 980,000 | 0% | 0.06% | $10,094,000 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 3.8% | 850,000 | -58% | 0.01% | $8,755,000 |
| Polar Asset Management Partners Inc. | 3.7% | 812,332 | -19% | 0.17% | $8,367,020 |
| PICTON MAHONEY ASSET MANAGEMENT | 3.4% | 750,000 | 0% | 0.08% | $7,725,000 |
| TWO SIGMA INVESTMENTS, LP | 3.3% | 725,000 | 0% | 0.01% | $7,467,500 |
| Radcliffe Capital Management, L.P. | 3% | 667,119 | +2.6% | 0.37% | $6,871,326 |
| Magnetar Financial LLC | 2.7% | 600,000 | 0% | 0.06% | $6,180,000 |
| D. E. Shaw & Co., Inc. | 2.7% | 600,000 | 0% | 0% | $6,180,000 |
| Hudson Bay Capital Management LP | 2.5% | 550,000 | 0.03% | $5,665,000 | |
| MOORE CAPITAL MANAGEMENT, LP | 2.3% | 500,000 | 0% | 0.1% | $5,150,000 |
| Sculptor Capital LP | 2.3% | 500,000 | -50% | 0.06% | $5,150,000 |
| Jain Global LLC | 2.3% | 500,000 | 0% | 0.05% | $5,150,000 |
| HBK INVESTMENTS L P | 2.3% | 499,998 | 0% | 0.06% | $5,149,979 |
| Shaolin Capital Management LLC | 2.2% | 490,000 | +32% | 0.19% | $5,047,000 |
| GOLDMAN SACHS GROUP INC | 2.1% | 462,806 | +0% | 0% | $4,766,902 |
| Periscope Capital Inc. | 2% | 450,000 | +4% | 0.9% | $4,635,000 |
| MANGROVE PARTNERS IM, LLC | 2% | 449,998 | -0% | 0.38% | $4,634,979 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 1.8% | 400,000 | 0% | 0.02% | $4,120,000 |
| BERKLEY W R CORP | 1.8% | 396,960 | 0% | 0.23% | $4,088,688 |
| First Trust Capital Management L.P. | 1.7% | 380,000 | 0% | 0.24% | $3,914,000 |
Institutional Holders of Artius II Acquisition Inc. - Class A Common Stock (AACB) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 2,045,656 | $21,138,145 | -$398,509 | $10.34 | 8 |
| 2025 Q4 | 20,880,226 | $215,043,524 | -$2,282,434 | $10.30 | 47 |
| 2025 Q3 | 21,102,318 | $214,091,451 | +$21,410,423 | $10.14 | 43 |
| 2025 Q2 | 18,992,045 | $192,176,114 | +$190,675,934 | $10.12 | 41 |