| BlockAviationFintech | Fintech | Dublin, Ireland | — | blockaviation.com |
| BloomfilterB2B | B2B | Cleveland, United States | — | thebloomfilter.com |
| Blue FeverOther | Other | Marina del Rey, United States | Melissa Ambrosini | bluefever.com |
| Blue Navy RecoveryB2B | B2B | Irvine, United States | — | bluenavy.org |
| Blue StudiosFintech | Fintech | New York City, United States | — | bluestudios.io |
| Blueconomy AIB2B | B2B | Tinsukia, India | — | theblueconomy.ai |
| BluecoreOther | Other | New York City, United States | Fayez Mohamood | bluecore.com |
| bluefliteOther | Other | Austin, United States | — | blueflite.com |
| Blueprint RegistryFintech | Fintech | Seattle, United States | — | blueprintregistry.com |
| BodyProHealthcare | Healthcare | Ra'anana, Israel | — | mybodypro.fit |
| BokioFintech | Fintech | Göteborg, Sweden | Viktor Stensson | bokio.se |
| Bold MetricsB2B | B2B | San Francisco, United States | Helder Antunes | boldmetrics.com |
| BoldrOther | Other | London, United Kingdom | — | shopboldr.com |
| BooqedConsumer | Consumer | Hong Kong, China | James Greaves | booqed.com |
| Boson MotorsIndustrials | Industrials | Milpitas, United States | Suman Mulumudi | bosonmotors.com |
| Botany.ioB2B | B2B | Seattle, United States | — | botany.io |
| BountifarmB2B | B2B | St Leonards, Australia | — | bountifarm.com |
| BoutiqB2B | B2B | Austin, United States | — | boutiq.co |
| BoxtreeOther | Other | Durham, United States | — | boxtree.gg |
| boxxtechOther | Other | Scottsdale, United States | — | boxxtech.ai |
| BPRXFintech | Fintech | Monterrey, Mexico | — | getbprx.com |
| BrainSpecHealthcare | Healthcare | Boston, United States | Praveen Kulkarni | brainspecmed.com |
| BranchFintech | Fintech | Minneapolis, United States | Atif Siddiqi | branchapp.com |
| Branching MindsOther | Other | New York City, United States | Ramon Miramontes | branchingminds.com |
| BrandfolderB2B | B2B | Denver, United States | Steve Trumbull | brandfolder.com |
| BridgeCare FinanceFintech | Fintech | Seattle, United States | — | getbridgecare.com |
| Bridged MediaOther | Other | London, United Kingdom | — | bridged.media |
| BridgifyB2B | B2B | Tel Aviv, Israel | — | bridgify.io |
| Briefcase TechnologyOther | Other | Marrickville, Australia | — | briefcase.technology |
| BriteEducation | Education | Bothell, United States | — | gobrite.io |
| BrixelyB2B | B2B | Middletown, United States | — | brixely.com |
| BriziOther | Other | Toronto, Canada | Kun Hu | brizicam.com |
| BroadlumeOther | Other | Sarasota, United States | Chris Ramey | broadlume.com |
| BruinB2B | B2B | Berlin, Germany | — | getbruin.com |
| BstowConsumer | Consumer | Brooklyn, United States | — | bstowapp.com |
| BuildstashB2B | B2B | Glasgow, United Kingdom | — | buildstash.com |
| BuiltBlockOther | Other | Bloomfield, United States | — | builtblock.com |
| BunchaConsumer | Consumer | Hopkins, United States | — | gobuncha.com |
| BundledOther | Other | Plano, United States | — | gobundled.com |
| ButterflyeB2B | B2B | Denver, United States | — | butterflye.io |
| BYBEConsumer | Consumer | Columbus, United States | — | bybe.com |
| ByDesignConsumer | Consumer | Reading, United States | — | bydesign.io |
| CAALAIndustrials | Industrials | Munich, Germany | — | caala.de |
| CabinetIndustrials | Industrials | New York City, United States | Kate Skavish | joincabinet.com |
| Cabinet HealthIndustrials | Industrials | Washington, United States | Achal Patel | wearecabinet.com |
| CachetFintech | Fintech | Tallinn, Estonia | — | cachet.me |
| Caddy SystemsOther | Other | Markham, Canada | — | joincaddy.com |
| CancerAidHealthcare | Healthcare | Camperdown, Australia | Rohan Arora | canceraid.com |
| Candoo TechOther | Other | New York City, United States | Lori The | candootech.com |
| CanopieOther | Other | Falls Church, United States | — | canopie.app |