Latest Period
Q1 2026
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
52
Shares (Excl. Options)
21,265,554
Price
$10.34
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- Security type / class
- Equity / Class A Common Stock
- Symbol
- AACB on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 21,265,554
- Total 13F value
- $219,803,713
- Portfolio coverage rank
- 0%
- Share change
- +9,110
- Value change
- +$98,494
- Number of holders
- 52
- Shares outstanding
- 22,189,349
- SEC-reported price per share
- $10.37
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- AACB - Artius II Acquisition Inc. - Class A Common Stock is tracked under CUSIP G0509J115.
- 52 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 47 to 52 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $215,043,524 to $219,803,713.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 52 institutions filings for Q1 2026.
Security key
G0509J115
Latest holder period
Q1 2026
13F holders
52
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
AACB full holder history
Artius II Acquisition Inc. SEC filings
Artius II Acquisition Inc. company facts
Artius II Acquisition Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G0509J115:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
AACB
| 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 Mar 2026, 52 institutional investors reported holding 21,265,554 shares of Artius II Acquisition Inc. - Class A Common Stock (AACB). This represents 96% of the company’s total 22,189,349 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
79%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| HGC Investment Management Inc. | 6.8% | 1,500,000 | 0% | 3.4% | $15,510,000 |
| AQR Arbitrage LLC | 6.5% | 1,432,183 | -3.9% | 0.24% | $14,794,450 |
| GLAZER CAPITAL, LLC | 5.8% | 1,295,029 | +12% | 0.29% | $13,391,000 |
| Linden Advisors LP | 4.5% | 1,000,000 | 0% | 0.06% | $10,330,000 |
| Westchester Capital Management, LLC | 4.5% | 995,939 | 0% | 0.5% | $10,288,050 |
| Alberta Investment Management Corp | 4.4% | 980,000 | 0% | 0.06% | $10,123,400 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 3.8% | 850,000 | 0% | 0.01% | $8,780,500 |
| Polar Asset Management Partners Inc. | 3.6% | 800,000 | -1.5% | 0.2% | $8,272,000 |
| PICTON MAHONEY ASSET MANAGEMENT | 3.4% | 750,000 | 0% | 0.08% | $7,755,000 |
| TWO SIGMA INVESTMENTS, LP | 3.3% | 725,000 | 0% | 0.01% | $7,496,500 |
| Radcliffe Capital Management, L.P. | 3.1% | 678,671 | +1.7% | 0.53% | $7,017,458 |
| D. E. Shaw & Co., Inc. | 2.7% | 600,000 | 0% | 0% | $6,198,000 |
| Magnetar Financial LLC | 2.7% | 600,000 | 0% | 0.06% | $6,204,000 |
| Shaolin Capital Management LLC | 2.5% | 550,000 | +12% | 0.47% | $5,687,000 |
| Hudson Bay Capital Management LP | 2.5% | 550,000 | 0% | 0.03% | $5,681,500 |
| MOORE CAPITAL MANAGEMENT, LP | 2.3% | 500,000 | 0% | 0.19% | $5,170,000 |
| Sculptor Capital LP | 2.3% | 500,000 | 0% | 0.06% | $5,170,000 |
| HBK INVESTMENTS L P | 2.3% | 499,998 | 0% | 0.07% | $5,169,979 |
| GOLDMAN SACHS GROUP INC | 2.1% | 462,806 | 0% | 0% | $4,785,414 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 1.8% | 398,075 | -0.48% | 0.02% | $4,112,115 |
| BERKLEY W R CORP | 1.8% | 396,960 | 0% | 0.22% | $4,104,566 |
| First Trust Capital Management L.P. | 1.7% | 380,000 | 0% | 0.21% | $3,929,200 |
| Periscope Capital Inc. | 1.7% | 375,000 | -17% | 0.68% | $3,877,500 |
| Jain Global LLC | 1.7% | 366,849 | -27% | 0.05% | $3,789,550 |
| MANGROVE PARTNERS IM, LLC | 1.6% | 356,172 | -21% | 0.3% | $3,682,818 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
4
Latest
Q1 2026
Rows shown
1-4 of 4
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 21,265,554 | $219,803,713 | +$98,494 | $10.34 | 52 |
| 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 |