| MonitaurB2B | B2B | Boston, United States | Anthony Habayeb | monitaur.ai |
| MonzoFintech | Fintech | — | Tom Blomfield | monzo.com |
| MoQualityB2B | B2B | Atlanta, United States | Shauvik Roy Choudhary | moquality.com |
| Morpheus SpaceOther | Other | Los Angeles, United States | Daniel Bock | morpheus.space |
| MorphikB2B | B2B | San Francisco, United States | Adityavardhan Agrawal | morphik.ai |
| MorphLB2B | B2B | Dover, United States | — | morphl.ai |
| MorphoAIIndustrials | Industrials | New York, United States | | morpho.ai |
| MortyFintech | Fintech | New York City, United States | Brian Faux | morty.com |
| Mosaic ManufacturingOther | Other | Toronto, Canada | Chris Labelle | mosaicmanufacturing.com |
| MossB2B | B2B | San Mateo, United States | Sri Raghu Malireddi | moss.dev |
| Mother of FactHealthcare | Healthcare | Sunapee, United States | — | motheroffact.com |
| Motics TechnologiesHealthcare | Healthcare | London, United Kingdom | — | motics.co.uk |
| MotivesB2B | B2B | London, United Kingdom | | motives.ai |
| MotivoHealthcare | Healthcare | Chattanooga, United States | Stephanie Prechter | motivohealth.com |
| MotleyB2B | B2B | — | — | motley.ai |
| MotorMiaConsumer | Consumer | — | — | motormia.co |
| MotorosoOther | Other | Santa Clara, United States | Nate Wyne | motoroso.com |
| MouseCatB2B | B2B | — | | mousecat.ai |
| MOVEdotB2B | B2B | San Francisco, United States | | movedot.ai |
| MovopackIndustrials | Industrials | Milan, Italy | — | movopack.com |
| MoyaeHealthcare | Healthcare | Austin, United States | — | moyae.com |
| MR PrestaFintech | Fintech | Bee Cave, United States | — | mrpresta.com |
| Much Better AdventuresConsumer | Consumer | — | Piers Brown | muchbetteradventures.com |
| muffintechB2B | B2B | Berlin, Germany | Jonas Boltz | muffintech.ai |
| MultifactorB2B | B2B | — | | multifactor.com |
| MultyB2B | B2B | London, United Kingdom | — | multy.dev |
| MunifyFintech | Fintech | — | | munify.ai |
| Muro AIB2B | B2B | New York City, United States | — | muro.ai |
| MurphyB2B | B2B | — | — | getmurphy.ai |
| Muse FinanceFintech | Fintech | London, United Kingdom | — | getmymuse.com |
| MuseAIOther | Other | Punchbowl, Australia | — | museai.au |
| Mushroom MaterialIndustrials | Industrials | Auckland, New Zealand | — | mushroommaterial.com |
| Music Tech WorksFintech | Fintech | Mableton, United States | — | musictechworks.com |
| MutableB2B | B2B | New York City, United States | — | mutable.io |
| MuuktestB2B | B2B | Raleigh, United States | Carlos Platero | muuktest.com |
| MyARC FitnessIndustrials | Industrials | London, United Kingdom | — | myarc.io |
| MyBuilderConsumer | Consumer | — | Alistair Rust | mybuilder.com |
| MyFavoritoOther | Other | San Francisco, United States | — | myfavorito.com |
| MYRConsumer | Consumer | Montréal, Canada | Jean-Baptiste Kuhn | myr.io |
| myTamarinB2B | B2B | London, United Kingdom | Sophia Kristiansen | mytamarin.com |
| NaborforceHealthcare | Healthcare | Richmond, United States | Paige Wilson | naborforce.com |
| NabuOther | Other | Strasbourg, France | — | nabu.io |
| NagishB2B | B2B | New York City, United States | Tomer Cohen | talknagish.com |
| NaiveB2B | B2B | San Francisco, United States | | usenaive.ai |
| NalaB2B | B2B | Miami, United States | Benjamin Fernandes | nalarocks.com |
| Namara Water TechnologiesB2B | B2B | Carlsbad, United States | — | namarawater.ai |
| NanoMatterOther | Other | Berlin, Germany | — | nano-matter.com |
| Naria AIB2B | B2B | San Mateo, United States | — | naria.ai |
| NarmiFintech | Fintech | New York City, United States | Nikhil Lakhanpal | narmi.com |
| NarrativeB2B | B2B | San Francisco, United States | | narrative-sports.com |