Comparable stake leader
Artius II Acquisition Partners LLC
SEC ownership of Artius II Acquisition Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002034334.
Disclosed value leader
Artius II Acquisition Partners LLC
Comparable rows
31/50
Latest evidence
30 Jun 2026
- Public ticker
- AACB, AACBR, AACBU on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Artius II Acquisition Partners LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
31 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Artius II Acquisition Partners LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0002034334
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Artius II Acquisition Inc. (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.
Comparable stake leader
Artius II Acquisition Par...
Disclosed value leader
Artius II Acquisition Par...
Comparable rows
31/50
Latest evidence
30 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 20%
19 rows are not safely comparable across share classes.
13D/G row: Artius II Acquisition Partners LLC
Showing 1-8 of 50 holder rows.
Quick read
Artius II Acquisition Partners LLC leads the comparable SEC ownership view at 20%.
31 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Artius II Acquisition Partners LLC's linked filing trail.
Comparable ownership
Top 5
Artius II Acquisition Partners LLC
20%
HGC Investment Management Inc.
6.8%
AQR CAPITAL MANAGEMENT LLC
6.4%
GLAZER CAPITAL, LLC
5.5%
Sculptor Capital LP
4.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Artius II Acquisition Partners LLC |
13D/G
3/4/5
10%+ Owner
|
20%
|
$56,069,000
5,675,000 shares
|
$0 | 14 Feb 2025 |
| HGC Investment Management Inc. |
13F
13D/G
Company
|
6.8%
from 13D/G
|
$16,050,000
3,000,000 shares
mixed-class rows
|
— | 30 Jun 2026 |
| AQR CAPITAL MANAGEMENT LLC |
13D/G
|
6.4%
|
$15,202,315
1,502,205 shares
|
-$4,835,285 | 30 Jun 2025 |
| GLAZER CAPITAL, LLC |
13F
13D/G
Company
|
5.5%
from 13D/G
|
$13,644,000
1,570,130 shares
mixed-class rows
|
— | 30 Jun 2026 |
| Sculptor Capital LP |
13D/G
13F
Company
|
4.5%
|
$10,590,000
1,000,000 shares
|
-$4,236,000 | 30 Sep 2025 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND |
13F
13D/G
Company
|
3.8%
from 13D/G
|
$9,328,000
2,850,000 shares
mixed-class rows
|
— | 30 Jun 2026 |
| Polar Asset Management Partners Inc. |
13F
13D/G
Company
|
3.6%
from 13D/G
|
$8,707,000
2,300,000 shares
mixed-class rows
|
— | 30 Jun 2026 |
| Westchester Capital Management, LLC |
13F
Company
|
4.5%
|
$10,437,440
995,939 shares
|
— | 30 Jun 2026 |
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.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 06 Oct 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-5 of 5 reporting-owner rows connected to Artius II Acquisition Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
5
Largest Forms 3/4/5 holder
Artius II Acquisition Partners LLC
Net 12M change
$0
Latest report
12 Feb 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Artius II Acquisition Partners LLC | 10%+ Owner | Mixed | 12 Feb 2025 | |||
| Karen A. Richardson | Director | Mixed | 12 Feb 2025 | |||
| Kevin Costello | Director | Mixed | 12 Feb 2025 | |||
| John Stanley Stein III | Director | Mixed | 12 Feb 2025 | |||
| Boon Sim | CEO, CFO, Director, 10%+ Owner | Mixed | 12 Feb 2025 |
Recent insider transactions for Artius II Acquisition Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.