Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-12)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | ARCI · NASDAQ | 35,262,000 | 20,236,815 | 57.4% | 52 | G0453R105 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (15 of 15 · G0453R121)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | LMR Partners LLP | 1,250,000 | — | $12.7M | — |
| 2 | TUDOR INVESTMENT CORP ET AL | 650,000 | — | $6.6M | — |
| 3 | TORONTO DOMINION BANK | 646,217 | — | $6.6M | +396,217 (+158.5%) |
| 4 | OMERS ADMINISTRATION Corp | 480,000 | — | $4.9M | — |
| 5 | ARISTEIA CAPITAL, L.L.C. | 400,779 | — | $4.1M | +989 (+0.2%) |
| 6 | Lineage Point Capital LP | 288,776 | — | $3.0M | +13,776 (+5.0%) |
| 7 | BlueCrest Capital Management Ltd | 275,000 | — | $2.8M | — |
| 8 | MILLENNIUM MANAGEMENT LLC | 179,743 | — | $1.8M | -170,257 (-48.6%) |
| 9 | Qube Research & Technologies Ltd | 150,000 | — | $1.5M | — |
| 10 | Calamos Advisors LLC | 124,000 | — | $1.3M | — |
| 11 | Westchester Capital Management, LLC | 100,000 | — | $1.0M | — |
| 12 | Clear Street Group Inc. | 34,256 | — | $349K | +24,194 (+240.4%) |
| 13 | HRT FINANCIAL LP | 25,000 | — | $256K | +4 (+0.0%) |
| 14 | Tuttle Capital Management, LLC | 10,769 | — | $109K | +769 (+7.7%) |
| 15 | GLAZER CAPITAL, LLC | 10,523 | — | $110K | NEW |
Exited since 2026-03-31 (15 filers; largest 15 shown)
| Alberta Investment Management Corp | −1,000,000 |
| AQR Arbitrage LLC | −757,625 |
| Lighthouse Investment Partners, LLC | −500,000 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | −500,000 |
| BNP PARIBAS FINANCIAL MARKETS | −492,375 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | −400,000 |
| MMCAP International Inc. SPC | −300,000 |
| Schonfeld Strategic Advisors LLC | −236,368 |
| Wealthspring Capital LLC | −166,480 |
| PICTON MAHONEY ASSET MANAGEMENT | −150,000 |
| BOOTHBAY FUND MANAGEMENT, LLC | −100,000 |
| Bulldog Investors, LLP | −67,500 |
| ABC ARBITRAGE SA | −40,000 |
| PRELUDE CAPITAL MANAGEMENT, LLC | −20,000 |
| Stoic Point Capital Management LLC | −20,000 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| Adage Capital Management, L.P. | SCHEDULE 13G | 2026-05-13 | 2026-03-31 | 1,800,000 | 5.1% |
| Phillip Gross | SCHEDULE 13G | 2026-05-13 | 2026-03-31 | 1,800,000 | 5.1% |
| Robert Atchinson | SCHEDULE 13G | 2026-05-13 | 2026-03-31 | 1,800,000 | 5.1% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.