| APMCF | Morien Resources Corp. | Energy | $9.0M | — | 0 |
| MORN | Morningstar, Inc. | Financial Services | $7.4B | — | 0 |
| CPMV | Mosaic ImmunoEngineering Inc. | Healthcare | $0.4M | — | 0 |
| MPAA | Motorcar Parts of America, Inc. | Consumer Cyclical | $200M | — | 0 |
| MSI | Motorola Solutions, Inc. | Technology | $75.0B | — | 0 |
| MSGM | Motorsport Games Inc. | Technology | $22.7M | — | 0 |
| MLCIL | Mount Logan Capital Inc. | — | — | — | 0 |
| MCAHU | Mountain Crest Acquisition 6 Corp. | — | — | — | 0 |
| MCAGU | Mountain Crest Acquisition Corp. V | Financial Services | $37.5M | — | 0 |
| MLAAU | Mountain Lake Acquisition Corp. II | — | — | — | 0 |
| MOVAA | Movado Group, Inc. | — | — | — | 0 |
| MITQ | Moving iMage Technologies, Inc. | Technology | $6.2M | — | 0 |
| MZYX-UN | MOZAYYX Acquisition Corp. | — | — | — | 0 |
| MP | MP Materials Corp. | Basic Materials | $8.8B | — | 0 |
| MPLX | MPLX Lp | Energy | $58.8B | — | 0 |
| MNESP | MSA Safety Incorporated | Industrials | $7.4B | — | 0 |
| MSIF | MSC Income Fund, Inc. | Financial Services | $552M | — | 0 |
| MSM | MSC Industrial Direct Co., Inc. | Industrials | $6.7B | — | 0 |
| MSCI | MSCI Inc. | Financial Services | $40.4B | — | 0 |
| MSGR | MSGS Spinco, Inc. | — | — | — | 0 |
| MSPR | MSP Recovery, Inc. | Healthcare | $0.0M | — | 0 |
| MTNOF | MTN Group Limited | Communication Services | $21.7B | — | 0 |
| VGES | Mu Global Holding Limited | — | — | — | 0 |
| MLI | Mueller Industries, Inc. | Industrials | $13.3B | — | 0 |
| MWA | Mueller Water Products, Inc. | Industrials | $3.4B | — | 0 |