| CityCopOther | Other | San Francisco, United States | — | citycop.org |
| Civic EagleOther | Other | Mounds View, United States | Damola Ogundipe | civiceagle.com |
| ckbkConsumer | Consumer | London, United Kingdom | Matthew Cockerill | ckbk.com |
| ClaraB2B | B2B | Abu Dhabi, United Arab Emirates | Gus Cerro | clara.co |
| ClarisightsOther | Other | Palo Alto, United States | Avinash Kunnath | clarisights.com |
| ClaroAIOther | Other | Hod HaSharon, Israel | — | claroai.com |
| ClassPassIndustrials | Industrials | New York City, United States | Payal Kadakia | classpass.com |
| ClassWalletFintech | Fintech | Miami, United States | Jamie Rosenberg | classwallet.com |
| Clean OSHealthcare | Healthcare | Milan, Italy | — | thecleanos.com |
| Clear Solar CorporationIndustrials | Industrials | Hurley, United States | — | clearsolarco.com |
| ClearstepOther | Other | Chicago, United States | Adeel Malik | clearstep.health |
| CledaraFintech | Fintech | London, United Kingdom | Cristina Vila | cledara.com |
| CleverPetB2B | B2B | La Jolla, United States | Leo Trottier | clever.pet |
| ClicktivatedOther | Other | Birmingham, United States | Jason Shroot | clicktivated.com |
| ClimatescapeIndustrials | Industrials | Walnut, United States | — | climatescape.org |
| Clinify HealthHealthcare | Healthcare | Chicago, United States | — | clinifyhealth.com |
| CLLCTVEOther | Other | Syracuse, United States | Camron Gnass | cllctve.com |
| Cloud FenceB2B | B2B | Roquebrune Sur Argens, France | — | cloudfence.com |
| Cloud9 MoneyB2B | B2B | City of Newark, United States | — | cloud9.money |
| CloudabilityB2B | B2B | Portland, United States | J.R. Storment | cloudability.com |
| CloudRenoB2B | B2B | Vancouver, Canada | — | cloudrenovation.com |
| Cloverleaf AIB2B | B2B | Denver, United States | Kirsten Moorefield | cloverleaf.ai |
| ClusterOther | Other | New York City, United States | — | hello-cluster.com |
| Clutch PrepEducation | Education | Miami, United States | — | clutchprep.com |
| ClydeOther | Other | New York City, United States | Brandon Gell | joinclyde.com |
| CnergreenIndustrials | Industrials | Calgary, Canada | — | cnergreen.ca |
| CoachUpConsumer | Consumer | Boston, United States | Jordan Fliegel | coachup.com |
| CobaltOther | Other | Boston, United States | Esben Friis-Jensen | cobalt.pe |
| CobuConsumer | Consumer | Boston, United States | Tara Rapoport | livecobu.com |
| CoconutFintech | Fintech | London, United Kingdom | — | getcoconut.com |
| CodeGPT by JudiniB2B | B2B | Miami, United States | Daniel Avila | codegpt.co |
| CodeMentorEducation | Education | Sunnyvale, United States | Weiting Liu | codementor.io |
| CodeshipConsumer | Consumer | Brookline Village, United States | Moritz Plassnig | codeship.com |
| CodigaB2B | B2B | Denver, United States | Nicolas Vuillamy | codiga.io |
| CodSpeedB2B | B2B | Paris, France | Adrien Anceau | codspeed.io |
| CogniB2B | B2B | New York City, United States | Archie Ravishankar | getcogni.com |
| CogniSaaSB2B | B2B | Bengaluru, India | Rakesh Shrivastava | cognisaas.com |
| Cognitive SpaceB2B | B2B | Houston, United States | Sherri Calomino | cognitivespace.com |
| CognotionConsumer | Consumer | New York City, United States | — | cognotion.com |
| College ContactEducation | Education | Charlottesville, United States | — | yourcollegecontact.com |
| CometOther | Other | New York City, United States | Gur Kimchi | comet.com |
| CometChatConsumer | Consumer | Boulder, United States | Khushboo Garg | cometchat.com |
| CommissionTracB2B | B2B | Atlanta, United States | — | commissiontrac.com |
| CommunityConsumer | Consumer | Los Angeles, United States | Dominic Puszert | community.com |
| ComplokB2B | B2B | Tallinn, Estonia | — | complok.eu |
| ComputerWellOther | Other | Jakobsli, Norway | — | computerwell.com |
| Con.doitOther | Other | Birmingham, United States | — | condoit.io |
| Concert FinanceFintech | Fintech | New York City, United States | — | concertfinance.com |
| Concordare TrialsHealthcare | Healthcare | New York City, United States | — | concordaretrials.com |
| ConductricsOther | Other | Brooklyn, United States | Matt Finlay | conductrics.com |