Who owns AACOU
Which tracked institutional funds hold AACOU, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AACOU company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
Conviction spread
AACOU’s largest tracked holder by dollar value, Magnetar Financial LLC, sizes it at 0.2% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AACOU 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
Only one quarter (2026-Q1) of 13F history is available — a quarter-over-quarter accumulation delta needs two.
We do not publish a positioning read for a window we cannot measure honestly. A starting question, not a verdict.
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.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Magnetar Financial LLC new | 1,950,000 | $19M | 9.1% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. new | 1,800,000 | $18M | 8.4% | 2026-Q1 |
| Linden Advisors LP new | 1,350,000 | $13M | 6.3% | 2026-Q1 |
| AQR Arbitrage LLC new | 1,014,050 | $10M | 4.8% | 2026-Q1 |
| Polar Asset Management Partners Inc. new | 1,000,000 | $10M | 4.7% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC new | 926,000 | $9M | 4.3% | 2026-Q1 |
| Mint Tower Capital Management B.V. new | 900,000 | $9M | 4.2% | 2026-Q1 |
| LMR Partners LLP new | 900,000 | $9M | 4.2% | 2026-Q1 |
| Kryger Capital LLC new | 854,259 | $8M | 4.0% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND new | 800,000 | $8M | 3.8% | 2026-Q1 |
| SONA ASSET MANAGEMENT (US) LLC new | 750,000 | $7M | 3.5% | 2026-Q1 |
| TENOR CAPITAL MANAGEMENT Co., L.P. new | 713,283 | $7M | 3.3% | 2026-Q1 |
| Alberta Investment Management Corp new | 700,000 | $7M | 3.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS new | 685,950 | $7M | 3.2% | 2026-Q1 |
| Verition Fund Management LLC new | 600,000 | $6M | 2.8% | 2026-Q1 |
| GLAZER CAPITAL, LLC new | 519,652 | $5M | 2.4% | 2026-Q1 |
| OMERS ADMINISTRATION Corp new | 450,000 | $4M | 2.1% | 2026-Q1 |
| ARISTEIA CAPITAL, L.L.C. new | 443,964 | $4M | 2.1% | 2026-Q1 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC new | 425,000 | $4M | 2.0% | 2026-Q1 |
| PICTON MAHONEY ASSET MANAGEMENT new | 400,000 | $4M | 1.9% | 2026-Q1 |
| MOORE CAPITAL MANAGEMENT, LP new | 400,000 | $4M | 1.9% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP new | 362,500 | $4M | 1.7% | 2026-Q1 |
| Radcliffe Capital Management, L.P. new | 326,342 | $3M | 1.5% | 2026-Q1 |
| WHITEBOX ADVISORS LLC new | 300,000 | $3M | 1.4% | 2026-Q1 |
| Saba Capital Management, L.P. new | 249,950 | $2M | 1.2% | 2026-Q1 |
| TORONTO DOMINION BANK new | 230,000 | $2M | 1.1% | 2026-Q1 |
| Lineage Point Capital LP new | 200,000 | $2M | 0.9% | 2026-Q1 |
| Periscope Capital Inc. new | 200,000 | $2M | 0.9% | 2026-Q1 |
| Calamos Advisors LLC new | 198,000 | $2M | 0.9% | 2026-Q1 |
| BERKLEY W R CORP new | 160,097 | $2M | 0.8% | 2026-Q1 |
| Ghisallo Capital Management LLC new | 150,000 | $1M | 0.7% | 2026-Q1 |
| DLD Asset Management, LP new | 150,000 | $1M | 0.7% | 2026-Q1 |
| SYQUANT CAPITAL SAS new | 150,000 | $1M | 0.7% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC new | 136,738 | $1M | 0.6% | 2026-Q1 |
| Westchester Capital Management, LLC new | 125,000 | $1M | 0.6% | 2026-Q1 |
| L1 Global Manager Pty Ltd new | 100,000 | $994K | 0.5% | 2026-Q1 |
| Shaolin Capital Management LLC new | 100,000 | $994K | 0.5% | 2026-Q1 |
| Centiva Capital, LP new | 96,730 | $961K | 0.5% | 2026-Q1 |
| Virtu Financial LLC new | 93,159 | $926K | 0.4% | 2026-Q1 |
| Kepos Capital LP new | 75,000 | $746K | 0.4% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC new | 55,000 | $547K | 0.3% | 2026-Q1 |
| Stoic Point Capital Management LLC new | 55,000 | $546K | 0.3% | 2026-Q1 |
| HRT FINANCIAL LP new | 50,000 | $497K | 0.2% | 2026-Q1 |
| ABC ARBITRAGE SA new | 40,000 | $398K | 0.2% | 2026-Q1 |
| DELTEC ASSET MANAGEMENT LLC new | 35,000 | $348K | 0.2% | 2026-Q1 |
| Quarry LP new | 25,000 | $249K | 0.1% | 2026-Q1 |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 25,000 | $248K | 0.1% | 2026-Q1 |
| ROYAL BANK OF CANADA new | 19,843 | $197K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP new | 15,000 | $149K | 0.1% | 2026-Q1 |
| Hudson Bay Capital Management LP new | 12,677 | $126K | 0.1% | 2026-Q1 |
| Tuttle Capital Management, LLC new | 10,000 | $99K | 0.0% | 2026-Q1 |
| Clear Street Group Inc. new | 449 | $4K | 0.0% | 2026-Q1 |
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.