CA

Castle

YC W16 ↗

San Francisco, US · 20 employees · 8 known investors

castle.io ↗

Castle builds trust infrastructure for the modern internet, helping organizations detect and prevent fraud and account takeover attacks. The company serves enterprise and mid-market customers requiring security and identity verification solutions.

Founders & leadership· Y Combinator alumni (W16)

JB

Johan BrissmyrinFounder/CEO

SW

Sebastian WallininFounder/CTO

SS

Shardul Shah

Investors · 8

IN

Index Ventures✓ verifiedSan Francisco · $540K – $10.8M

Y

Y Combinator✓ verifiedSan Francisco · $500K

FI

First Round Capital✓ verifiedSan Francisco · $2M

F-

F-Prime Capital PartnersCambridge · $3M – $10M

WA

Walking VenturesLondon · $650K – $1.3M

BO

Boost VCreportedSan Mateo · $500K

SP

SparkLabs Global VenturesreportedPalo Alto

WI

Winklevoss CapitalreportedNew York · $100K – $5M