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 2026-08-14, as of 2026-08-10)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | ATLX · NASDAQ | 30,099,805 | 2,852,206 | 9.5% | 42 | 105861306 |
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 (42 of 42 · 105861306)
change vs 2026-03-31Exited since 2026-03-31 (11 filers; largest 11 shown)
| CITADEL ADVISORS LLC | −1,192,859 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | −166,073 |
| GSA CAPITAL PARTNERS LLP | −140,770 |
| GOLDMAN SACHS GROUP INC | −69,122 |
| D. E. Shaw & Co., Inc. | −49,799 |
| Diametric Capital, LP | −34,824 |
| Virtu Financial LLC | −20,533 |
| Quadrant Private Wealth Management, LLC | −18,000 |
| Quadrature Capital Ltd | −10,681 |
| Tower Research Capital LLC (TRC) | −4,351 |
| Frazier Financial Advisors, LLC | −14 |
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 |
|---|---|---|---|---|---|
| Citadel Advisors Holdings LP | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 1,030,491 | 3.8% |
| Citadel Advisors LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 1,030,491 | 3.8% |
| Citadel GP LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 1,030,491 | 3.8% |
| Citadel Securities GP LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 201,868 | 0.7% |
| Citadel Securities Group LP | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 201,868 | 0.7% |
| Citadel Securities LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 201,868 | 0.7% |
| Kenneth Griffin | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 1,232,359 | 4.5% |
| Mitsui & Co., Ltd. | SCHEDULE 13D/A | 2026-04-29 | 2026-04-29 | 2,068,089 | 7.3% |
| Waratah Capital Advisors Ltd. | SCHEDULE 13G/A | 2025-01-13 | 2024-12-31 | 568,893 | 3.73% |
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.