| AsideB2B | B2B | San Francisco, United States | Jun Kim | asidehq.com |
| AsimovIndustrials | Industrials | — | | tryasimov.ai |
| AskSAMIEHealthcare | Healthcare | Kansas City, United States | — | asksamie.com |
| AskSid Conversational AIB2B | B2B | Bengaluru, India | Sid Banerjee | asksid.ai |
| AskUIB2B | B2B | — | Nils Mehlhorn | askui.com |
| AspectB2B | B2B | — | | aspect.inc |
| Aspect HealthHealthcare | Healthcare | London, United Kingdom | Briana Christophers | aspect-health.com |
| AspinityOther | Other | Morgantown, United States | Tom Doyle | aspinity.com |
| AsporaFintech | Fintech | — | — | aspora.com |
| AssemblrFintech | Fintech | Bandung, Indonesia | Hasbi Asyadiq | assemblrworld.com |
| Asset RealityFintech | Fintech | London, United Kingdom | Aidan Larkin | assetreality.com |
| AssetVaultB2B | B2B | London, United Kingdom | — | asset-vault.com |
| Assort HealthHealthcare | Healthcare | — | — | assorthealth.com |
| AstorFintech | Fintech | San Francisco, United States | | astor.app |
| ASTRA by Czar SecuritiesB2B | B2B | Claymont, United States | — | getastra.com |
| AstroOther | Other | New York City, United States | — | hellotwist.com |
| Asvin TechB2B | B2B | Patna, India | — | dentratech.com |
| AteiosIndustrials | Industrials | La Jolla, United States | — | ateios.com |
| AthionB2B | B2B | Chesterfield, United States | — | athion.io |
| AthleteOther | Other | Harrogate, United Kingdom | — | lifeathlete.co |
| Atlantic MoneyFintech | Fintech | — | Patrick Kavanagh | atlanticmoney.com |
| Atlas WearablesOther | Other | Austin, United States | Peter Li | atlaswearables.com |
| Atlas5DHealthcare | Healthcare | Cambridge, United States | — | atlas5d.com |
| AtlasGridB2B | B2B | Mountain View, United States | | atlasgrid.ai |
| ATMOIndustrials | Industrials | Berlin, Germany | — | atmo.earth |
| ATOMB2B | B2B | Greenville, United States | — | atomchat.io |
| Atomic AIHealthcare | Healthcare | — | Raphael Townshend | atomic.ai |
| Atomos SpaceIndustrials | Industrials | Denver, United States | Vanessa Clark | atomosspace.com |
| AttioB2B | B2B | — | Nicolas Sharp | attio.com |
| Audigo LabsOther | Other | San Francisco, United States | — | audigolabs.com |
| AUDIT XPRTB2B | B2B | London, United Kingdom | — | auditxprt.com |
| AuditocityB2B | B2B | Fairhope, United States | — | auditocity.com |
| AugurOther | Other | Boulder, United States | Jack Peterson | augur.io |
| AumetHealthcare | Healthcare | Amman, Jordan | Nasser Alsharif | aumet.me |
| Aunt FlowOther | Other | Columbus, United States | Claire Coder | goauntflow.com |
| AuquanB2B | B2B | London, United Kingdom | Radhika Subramanian | auquan.com |
| Aura FinanceEducation | Education | San Francisco, United States | — | aurafinance.io |
| Auron SolutionsB2B | B2B | Sunnyvale, United States | — | auron.solutions |
| Aurorin CADB2B | B2B | — | | aurorincad.com |
| AutobonOther | Other | Chicago, United States | — | autobon.ai |
| Automax.aiOther | Other | San Francisco, United States | | automax.ai |
| AutomotusIndustrials | Industrials | Los Angeles, United States | Aaron Dagon | automotus.co |
| AutoneB2B | B2B | — | Antoine Nougué | autone.io |
| AutonomOther | Other | Columbus, United States | — | autonom.cc |
| Autonomous Technologies GroupFintech | Fintech | New York, United States | | becomeautonomous.com |
| AutosanaB2B | B2B | — | | autosana.ai |
| AutoSituB2B | B2B | — | | autositu.com |
| Autumn AIB2B | B2B | — | | autumnai.com |
| Auxilius.aiOther | Other | Unterföhring, Germany | — | auxilius.ai |
| Avarie FemcareOther | Other | Long Beach, United States | — | avariefemcare.com |