| 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 |
| Common RoomB2B | B2B | — | Linda Lian | commonroom.io |
| CommunityConsumer | Consumer | Los Angeles, United States | Dominic Puszert | community.com |
| CommureHealthcare | Healthcare | — | Tanay Tandon | commure.com |
| ComplokB2B | B2B | Tallinn, Estonia | — | complok.eu |
| ComplyDoB2B | B2B | Berlin, Germany | | complydo.io |
| CompresrB2B | B2B | — | Ivan Zakazov | compresr.ai |
| ComputerWellOther | Other | Jakobsli, Norway | — | computerwell.com |
| CompyleB2B | B2B | San Francisco, United States | | compyle.ai |
| 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 |
| Condor EnergyIndustrials | Industrials | — | | condor.energy |
| ConductricsOther | Other | Brooklyn, United States | Matt Finlay | conductrics.com |
| Conduit VirtualConsumer | Consumer | Culver City, United States | — | conduit.gg |
| ConelabsOther | Other | Etobicoke, Canada | — | conelabs.ai |
| ConfettiOther | Other | Los Angeles, United States | Ronen Gafni | confetti.io |
| Confluence LabsB2B | B2B | — | Brent Burdick | confluence.sh |
| ConfluentB2B | B2B | — | Jay Kreps | confluent.io |
| CongruentIndustrials | Industrials | — | | congruent.io |
| Conservation LabsOther | Other | Brownsville, United States | Josh Siegel | conservationlabs.com |
| ConspireOther | Other | Boulder, United States | Alex Devkar | conspire.com |
| Constellation SpaceB2B | B2B | — | | constellationspace.ai |
| Contera.aiOther | Other | Brasov, Romania | — | contera.ai |
| ContextFortB2B | B2B | San Francisco, United States | Ashwin Ramachandran | contextfort.ai |
| ConvergentB2B | B2B | London, United Kingdom | — | convergent.org |
| ConverSight.aiB2B | B2B | Indianapolis, United States | Santhosh Sivarajah | conversight.ai |
| ConvertFlowB2B | B2B | Miami, United States | Nathan Vander Heiden | convertflow.com |
| ConverzAIB2B | B2B | United States | Srikant Chellappa | converzai.com |
| ConvexiaHealthcare | Healthcare | — | | convexia.bio |
| ConveyOther | Other | Austin, United States | Rob Taylor | getconvey.com |
| CooklistOther | Other | Dallas, United States | — | cooklist.co |
| CopperlaneB2B | B2B | — | | copperlane.ai |
| CorelayerB2B | B2B | — | | corelayer.com |
| Cortex AIIndustrials | Industrials | San Francisco, United States | | cortexrobot.ai |
| CorveraB2B | B2B | — | | corvera.ai |
| CostreamConsumer | Consumer | San Francisco, United States | | costream.ai |
| CotoolB2B | B2B | San Francisco, United States | | cotool.ai |
| CountertopSmartOther | Other | Austin, United States | — | countertopsmart.com |
| CountlyB2B | B2B | — | Onur Altan Tan | countly.com |
| coUrbanizeOther | Other | Boston, United States | Karin Uhlich | courbanize.com |
| CourtsdeskB2B | B2B | Dublin, Ireland | — | courtsdesk.com |
| CovaticOther | Other | London, United Kingdom | Matthew Allatt | covatic.com |
| COVERRFintech | Fintech | New York City, United States | — | getcoverr.com |
| CoworksConsumer | Consumer | Raleigh, United States | — | coworksapp.com |
| CowTribeConsumer | Consumer | Tamale, Ghana | Gabriel Apea | cowtribe.com |
| CPRWrapHealthcare | Healthcare | Chattanooga, United States | — | cprwrap.com |
| Cranston AIB2B | B2B | San Francisco, United States | Sean O'Bannon | cranstonai.com |