Who owns Artius II Acquisition Inc. Class A Ordinary Shares (AACB)
Which tracked institutional funds hold AACB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AACB company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-17). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
6 tracked funds added or opened AACB while 7 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AACB’s largest tracked holder by dollar value, HGC Investment Management Inc., sizes it at 3.1% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 3.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AACB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 48 tracked filers holding AACB, 7 increased or opened the position and 13 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AACB between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 1
- HIGHBRIDGE CAPITAL MANAGEMENT LLC$2M
Full exits 3
- GLAZER CAPITAL, LLC$13M
- Fort Baker Capital Management LP$2M
- METEORA CAPITAL, LLC$1M
Largest adds
- Governors Lane LP$3M
- TORONTO DOMINION BANK$2M
- Periscope Capital Inc.$581K
- Quarry LP$469K
- AQR Arbitrage LLC$299K
Largest trims
- Shaolin Capital Management LLC$2M
- Jain Global LLC$2M
- Verition Fund Management LLC$967K
- RLH Capital LLC$673K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| HGC Investment Management Inc. | 1,500,000 | $16M | 6.8% | 2026-Q2 |
| AQR Arbitrage LLC added | 1,440,225 | $15M | 6.6% | 2026-Q2 |
| Linden Advisors LP | 1,000,000 | $10M | 4.6% | 2026-Q2 |
| Westchester Capital Management, LLC | 995,939 | $10M | 4.5% | 2026-Q2 |
| Alberta Investment Management Corp | 980,000 | $10M | 4.5% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 850,000 | $9M | 3.9% | 2026-Q2 |
| Polar Asset Management Partners Inc. | 800,000 | $8M | 3.6% | 2026-Q2 |
| PICTON MAHONEY ASSET MANAGEMENT | 750,000 | $8M | 3.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP | 725,000 | $8M | 3.3% | 2026-Q2 |
| Radcliffe Capital Management, L.P. | 678,671 | $7M | 3.1% | 2026-Q2 |
| Magnetar Financial LLC | 600,000 | $6M | 2.7% | 2026-Q2 |
| D. E. Shaw & Co., Inc. | 600,000 | $6M | 2.7% | 2026-Q2 |
| Hudson Bay Capital Management LP | 550,000 | $6M | 2.5% | 2026-Q2 |
| Governors Lane LP added | 500,000 | $5M | 2.3% | 2026-Q2 |
| Sculptor Capital LP | 500,000 | $5M | 2.3% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP | 500,000 | $5M | 2.3% | 2026-Q2 |
| HBK INVESTMENTS L P | 499,998 | $5M | 2.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC | 462,806 | $5M | 2.1% | 2026-Q2 |
| Periscope Capital Inc. added | 425,000 | $4M | 1.9% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 398,075 | $4M | 1.8% | 2026-Q2 |
| BERKLEY W R CORP | 396,960 | $4M | 1.8% | 2026-Q2 |
| First Trust Capital Management L.P. | 380,000 | $4M | 1.7% | 2026-Q2 |
| TORONTO DOMINION BANK added | 375,190 | $4M | 1.7% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC | 356,172 | $4M | 1.6% | 2026-Q2 |
| Shaolin Capital Management LLC trimmed | 351,827 | $4M | 1.6% | 2026-Q2 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 297,500 | $3M | 1.4% | 2026-Q2 |
| Verition Fund Management LLC trimmed | 257,357 | $3M | 1.2% | 2026-Q2 |
| RLH Capital LLC trimmed | 252,236 | $3M | 1.2% | 2026-Q2 |
| Quarry LP added | 252,236 | $3M | 1.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC | 245,631 | $3M | 1.1% | 2026-Q2 |
| Jain Global LLC trimmed | 202,091 | $2M | 0.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC | 200,000 | $2M | 0.9% | 2026-Q2 |
| GRITSTONE ASSET MANAGEMENT LLC | 197,656 | $2M | 0.9% | 2026-Q2 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC new | 177,898 | $2M | 0.8% | 2026-Q2 |
| SONA ASSET MANAGEMENT (US) LLC | 172,874 | $2M | 0.8% | 2026-Q2 |
| O'Connor Alternative Investments LLC | 160,000 | $2M | 0.7% | 2026-Q2 |
| DLD Asset Management, LP | 140,894 | $1M | 0.6% | 2026-Q2 |
| Context Capital Management, LLC | 112,191 | $1M | 0.5% | 2026-Q2 |
| Centiva Capital, LP | 100,000 | $1M | 0.5% | 2026-Q2 |
| MIZUHO SECURITIES USA LLC | 100,196 | $1M | 0.4% | 2026-Q2 |
| L1 Global Manager Pty Ltd | 75,000 | $787K | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 55,222 | $579K | 0.3% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC | 45,316 | $475K | 0.2% | 2026-Q2 |
| Clear Street Group Inc. trimmed | 35,799 | $376K | 0.2% | 2026-Q2 |
| PenderFund Capital Management Ltd. new | 32,500 | $341K | 0.1% | 2026-Q2 |
| ABC ARBITRAGE SA | 20,000 | $210K | 0.1% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC trimmed | 12,760 | $134K | 0.1% | 2026-Q2 |
| MORGAN STANLEY trimmed | 51 | $535 | 0.0% | 2026-Q2 |
| GLAZER CAPITAL, LLC added | 1,295,029 | $13M | 5.8% | 2026-Q1 stale (1 quarter behind) |
| Fort Baker Capital Management LP added | 232,736 | $2M | 1.0% | 2026-Q1 stale (1 quarter behind) |
| METEORA CAPITAL, LLC added | 109,223 | $1M | 0.5% | 2026-Q1 stale (1 quarter behind) |
| Crossingbridge Advisors, LLC new | 25,000 | $258K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Virtu Financial LLC added | 18,464 | $191K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| FNY Investment Advisers, LLC trimmed | 112 | $1K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| ATW SPAC MANAGEMENT LLC trimmed | 75,316 | $767K | 0.3% | 2025-Q3 stale (3 quarters behind) |
| Alpine Global Management, LLC new | 288,211 | $3M | 1.3% | 2025-Q2 stale (4 quarters behind) |
| K2 PRINCIPAL FUND, L.P. new | 112,006 | $1M | 0.5% | 2025-Q2 stale (4 quarters behind) |
| CLEAR STREET LLC new | 32,973 | $334K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| BARDIN HILL MANAGEMENT PARTNERS LP new | 25,027 | $253K | 0.1% | 2025-Q2 stale (4 quarters behind) |
1 parent filing withheld from the table above, and from the coverage figures, to avoid listing one book twice: OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) (last filed 2025-Q4, 160,000 shares) reconciles to its 1 current affiliate (160,000 shares) — 0.000% apart.
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.