| MealMeFintech | Fintech | Scottdale, United States | Marshall Hayner | mealme.ai |
| Medeo-healthOther | Other | Lyon, France | — | medeo-health.com |
| MedicusOther | Other | Carlsbad, United States | — | urbandatalab.co.kr |
| MEDIjobsB2B | B2B | Bucharest, Romania | — | medijobs.ro |
| MedPilotFintech | Fintech | New York City, United States | — | medpilot.com |
| MedThreadOther | Other | Miami Beach, United States | — | parambil.com |
| MedzoomerHealthcare | Healthcare | Tampa, United States | — | medzoomer.com |
| Mela WorksConsumer | Consumer | London, United Kingdom | — | mela.work |
| MemgraphB2B | B2B | London, United Kingdom | Dominik Tomicic | memgraph.io |
| MemoirConsumer | Consumer | New York City, United States | — | yourmemoir.com |
| MemriseEducation | Education | London, United Kingdom | Ed Cooke | memrise.com |
| Mentor CollectiveOther | Other | Boston, United States | Jack Moulton | mentorcollective.org |
| Mentor SpacesB2B | B2B | Denver, United States | Jerrell Jimerson | mentorspaces.com |
| MercatelyB2B | B2B | Sheridan, United States | Carlos Andrés Lara | mercately.com |
| Merry Pop-inOther | Other | Hadera, Israel | — | merrypopin.com |
| MesodyneIndustrials | Industrials | Somerville, United States | Veronika Stelmakh | mesodyne.com |
| Meta-FluxB2B | B2B | Dublin, Ireland | — | meta-flux.com |
| Metro Africa XpressOther | Other | Lagos, Nigeria | Adetayo Bamiduro | maxdrive.ai |
| MetrobiOther | Other | Boston, United States | Elvan Ceyhan | metrobi.com |
| MicaFintech | Fintech | Mexico City, Mexico | — | mica.rent |
| microTERRAIndustrials | Industrials | Irapuato, Mexico | — | microterra.com.mx |
| Mighty AudioConsumer | Consumer | Los Angeles, United States | — | bemighty.com |
| Milk MoovementIndustrials | Industrials | Halifax, Canada | Jackson Hutchison | milkmoovement.com |
| MimoEducation | Education | Vienna, Austria | — | mimo.org |
| MindframeB2B | B2B | Istanbul, Turkey | — | mindframe.care |
| Mine'dIndustrials | Industrials | New York City, United States | — | doyoumined.com |
| Mineral ForecastIndustrials | Industrials | Santiago, Chile | — | en.mineralforecast.com |
| Mint State LabsOther | Other | Redmond, United States | — | mintstatelabs.com |
| MiphicB2B | B2B | Wilmington, United States | — | miphic.co |
| MITO Material SolutionsOther | Other | Stillwater, United States | Eric Groo | mitomaterials.com |
| MiurosOther | Other | Lyon, France | — | miuros.com |
| MobiagConsumer | Consumer | Torres Vedras, Portugal | — | mobiag.com |
| MocavoOther | Other | Boulder, United States | Cliff Shaw | mocavo.com |
| Modal LivingOther | Other | Salt Lake City, United States | — | livemodal.com |
| ModalityEducation | Education | Boston, United States | — | findmodality.com |
| ModernFintech | Fintech | Denver, United States | — | modernis.com |
| ModernGuildEducation | Education | New York City, United States | — | modernguild.com |
| Modicus PrimeB2B | B2B | La Porte, United States | — | modicusprime.com |
| ModuleOther | Other | Pittsburgh, United States | — | modulehousing.com |
| mokSa AIOther | Other | Sterling Heights, United States | — | moksa.ai |
| MOLGOther | Other | Washington, United States | — | molg.ai |
| MonaB2B | B2B | San Francisco, United States | — | monaventures.co |
| MondaycarFintech | Fintech | Paris, France | — | mondaycar.com |
| MoneivaB2B | B2B | Omaha, United States | — | moneiva.com |
| MonitaurB2B | B2B | Boston, United States | Anthony Habayeb | monitaur.ai |
| MoQualityB2B | B2B | Atlanta, United States | Shauvik Roy Choudhary | moquality.com |
| Morpheus SpaceOther | Other | Los Angeles, United States | Daniel Bock | morpheus.space |
| MorphLB2B | B2B | Dover, United States | — | morphl.ai |
| MortyFintech | Fintech | New York City, United States | Brian Faux | morty.com |
| Mosaic ManufacturingOther | Other | Toronto, Canada | Chris Labelle | mosaicmanufacturing.com |