Founder Directory
Built by Keitoto
Founders498
Known for these resultsRole45%Role is parsed from founder titles in yc.db. Known for 45% of these rows — the rest have no title at all, mostly 2019–2023. Those rows stay in the result and are counted as Unknown, never as No.Bio83%Bio coverage: 83% of these founders have a bio on their YC profile. Every bio-derived facet (ex-company, school, credentials, discipline) is Unknown for the rest.Ex-company26%Ex-company is matched from bios with employment context (ex-, formerly, worked at). 26% of these rows have at least one match.School25%School is matched from bios, case-sensitive for acronyms. 25% of these rows have at least one match.
- Joohyun (CJ) ChaFounder/CEO · Dawn IndustriesS26Industrials · San Francisco
- Robin LeeFounder/CTO · Dawn IndustriesS26Industrials · San Francisco
- Alexander HalpernFounder · DreamS26B2B · San Francisco
- Ryland Birchmeier@rylandbirchFounder · DreamS26B2B · San Francisco
- Nikos Dritsakos@nikos1Founder/CEO · GlenS26B2B · San Francisco
- Karan RainaFounder/CTO · HyperProbeS26B2B · San Francisco
- Shailendra SinghFounder/CEO · HyperProbeS26B2B · San Francisco
- Claire Mao@clairemao78Founder/CEO · InstanceS26B2B · San Francisco
- Lucy Cai@LucyCai9Founder/CTO · InstanceS26B2B · San Francisco
- Shelden ShiFounder/CTO · OpenTagS26B2B · San Francisco
- Tony Kam@kamikariatFounder/CEO · OpenTagS26B2B · San Francisco
- Andrey GizdovFounder/CEO · OpenVectorS26B2B · San Francisco
- Vishal Urlam@vishalurlamFounder · OpenVectorS26B2B · San Francisco
- Anish Mariathasan@mariathasanishFounder/CEO · OsseusS26B2B
- Ayush PatelFounder/CTO · OsseusS26B2B
- Emily Colman@emilyrcolmanFounder · RonanRx Inc.S26Healthcare · San Francisco
- Lloyd Armbrust@larmbrustFounder/CEO · RonanRx Inc.S26Healthcare · San Francisco
- Ahmad IbrahimFounder/CTO · TryNearbyS26B2B · Los Angeles
- Obaida AlbaroudiFounder/COO · TryNearbyS26B2B · Los Angeles
- Yousef Abdelfattah@fazeapexFounder/CEO · TryNearbyS26B2B · Los Angeles
FOUNDERROLEBATCHINDUSTRYLOCATIONTEAMX_url
Joohyun (CJ) ChaDawn IndustriesFounder/CEOSummer 2026IndustrialsSan Francisco, United States2—Robin LeeDawn IndustriesFounder/CTOSummer 2026IndustrialsSan Francisco, United States2—Alexander HalpernDreamFounderSummer 2026B2BSan Francisco, United States2—Ryland BirchmeierDreamFounderSummer 2026B2BSan Francisco, United States2https://x.com/rylandbirchNikos DritsakosGlenFounder/CEOSummer 2026B2BSan Francisco, United States1https://x.com/nikos1Karan RainaHyperProbeFounder/CTOSummer 2026B2BSan Francisco, United States8—Shailendra SinghHyperProbeFounder/CEOSummer 2026B2BSan Francisco, United States8—Claire MaoInstanceFounder/CEOSummer 2026B2BSan Francisco, United States2https://x.com/clairemao78Lucy CaiInstanceFounder/CTOSummer 2026B2BSan Francisco, United States2https://x.com/LucyCai9Shelden ShiOpenTag2× YCFounder/CTOSummer 2026B2BSan Francisco, United States3—Tony KamOpenTag2× YCFounder/CEOSummer 2026B2BSan Francisco, United States3https://x.com/kamikariatAndrey GizdovOpenVectorFounder/CEOSummer 2026B2BSan Francisco, United States4—Vishal UrlamOpenVectorFounderSummer 2026B2BSan Francisco, United States4https://x.com/vishalurlamAnish MariathasanOsseusFounder/CEOSummer 2026B2BUnknown2https://x.com/mariathasanishAyush PatelOsseusFounder/CTOSummer 2026B2BUnknown2—Emily ColmanRonanRx Inc.FounderSummer 2026HealthcareSan Francisco, United States5https://x.com/emilyrcolmanLloyd ArmbrustRonanRx Inc.2× YCFounder/CEOSummer 2026HealthcareSan Francisco, United States5https://x.com/larmbrustAhmad IbrahimTryNearbyFounder/CTOSummer 2026B2BLos Angeles, United States5—Obaida AlbaroudiTryNearbyFounder/COOSummer 2026B2BLos Angeles, United States5—Yousef AbdelfattahTryNearbyFounder/CEOSummer 2026B2BLos Angeles, United States5https://x.com/fazeapex
Showing 1–20 of 498 founders
Lloyd Armbrust
Founder/CEO·RonanRx Inc.
PRIMARY INFO
RoleFounder/CEO
Team size5
BatchSummer 2026
LocationSan Francisco, United States
Company statusActive
StageEarly
BIO
2x YC founder. 3 Exits. 6 Kids. Built a $50M manufacturing business. Now building RonanRX. We use AI to personalize peptides and GLP1s like Ozempic to your biology. By combining labs, wearables, medical history, treatment response, and the latest research, we continuously personalize your treatment as your body changes. Peptides are like Claude Code for your body. Your biology is the prompt. Oldest founder in S26, raising six kids outside Austin, Texas.
Ex-company, school and discipline below are derived from this bio. Nothing is inferred when the bio is missing.
BACKGROUND
No notable employer or school mentioned in the bio.
Credentialsnone mentioned
DisciplineResearcherKeyword match from the bio text, not a classifier.
TRACK RECORD
2× YC founder
- W10OwnLocalActive
- S26RonanRx Inc.Active · this entry
COMPANY CONTEXT
RonanRx Inc.We use AI to personalize peptides to your biology
IndustryHealthcare
Websiteronanrx.com/
Team size5
X—
LocationSan Francisco, United States
BatchSummer 2026
Co-foundersEmily Colman@emilyrcolman
