| ATCMF | Atico Mining Corporation | Basic Materials | $29.7M | — | 0 |
| AUC | ATIF Holdings Limited Ordinary Shares | Financial Services | $91.8M | — | 0 |
| NANO | ATII Holdings Inc. | — | — | — | 0 |
| ATKR | Atkore Inc. | Industrials | $3.2B | — | 0 |
| BATRB | Atlanta Braves Holdings, Inc. | Communication Services | $2.7B | — | 0 |
| AAME | Atlantic American Corporation | Financial Services | $27.3M | — | 0 |
| AUB-PA | Atlantic Union Bankshares Corporation | — | — | — | 0 |
| ALDA | Atlantica, Inc. | Financial Services | $2.5M | — | 0 |
| ATLCZ | Atlanticus Holdings Corporation 9.25% Senior Notes due 2029 | Financial Services | $1.7B | — | 0 |
| ATCX | Atlas Critical Minerals Corporation | Basic Materials | $8.6M | — | 0 |
| AESI | Atlas Energy Solutions Inc. | Energy | $1.4B | — | 0 |
| ATLX | Atlas Lithium Corporation | Basic Materials | $78.4M | — | 0 |
| ATCHW | AtlasClear Holdings, Inc. | Financial Services | $0.9M | — | 0 |
| TEAM | Atlassian Corporation | Technology | $50.6B | — | 0 |
| ATO | Atmos Energy Corporation | Utilities | $26.1B | — | 0 |
| ATMU | Atmus Filtration Technologies Inc. | Consumer Cyclical | $3.7B | — | 0 |
| ATNI | ATN International, Inc. | Communication Services | $448M | — | 0 |
| ATOM | Atomera Incorporated | Technology | $168M | — | 0 |
| ATOS | Atossa Therapeutics, Inc. | Healthcare | $20.8M | — | 0 |
| ATAT | Atour Lifestyle Holdings Limited | Consumer Cyclical | $4.5B | — | 0 |
| RERE | ATRenew Inc. | Consumer Cyclical | $1.4B | — | 0 |
| ATRC | AtriCure, Inc. | Healthcare | $3.1B | — | 0 |
| RNA | Atrium Therapeutics, Inc. | Healthcare | $140M | — | 0 |
| ATS | ATS Corporation | Industrials | $1.9B | — | 0 |
| ATTO | Attovia Therapeutics, Inc. | Healthcare | $782M | — | 0 |