Investing Profile

Michael Seibel

VCInvestorAngel
Partner at Y Combinator
michaelseibel.comSan Francisco, California
Photo of Michael Seibel, Partner at Y Combinator
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Networks Michael is a member of
NewCo Network
1599 CONNECTIONS
NewCo Network
1599 CONNECTIONS
Top-Patents Network
1033 CONNECTIONS
Top-Patents Network
1033 CONNECTIONS
BlueStone Capital Partners, L.P. Network
432 CONNECTIONS

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Current Investing Position
Y Combinator Partner
Investment Range
$150K - $150K
Sweet Spot
$150K
Investments On Record
202

Michael Seibel is on these Sector & Stage Rankings

Michael Seibel's Investments On Record (161)

CompanyStageDateRound SizeTotal Raised
Simple AI
SeedFeb 2026$14M
Pre SeedSep 2024$500K
$15M
Legion Health
SeedJan 2026
Pre SeedJun 2021$2M
$2.1M
Co-investors: Diana Hu (Y Combinator), Tim Brady (Y Combinator), John Diaz (Estacado Interests)
FINNY
Series ADec 2025$17M
Pre SeedSep 2024$500K
$22M
Co-investors: Nick Beim (Venrock), Andre Charoo (iNovia Capital), Jason Wenk (Matterscale Ventures)
Reditus Space
SeedDec 2025$7M
Pre SeedNov 2024
$7M
Co-investors: Ryan Merket (Jude AI)
Cuckoo
SeedNov 2025$2M
Pre SeedJan 2025$500K
$8.5M
Co-investors: Wally Wang (Scale Asia Ventures), Gareth Jefferies (RTP Global)
Mecha Health
SeedNov 2025$4M
SeedMar 2025
$4M
FleetWorks Technology
Series AOct 2025$15M
Pre SeedSep 2023$500K
$16M
Co-investors: Bill Trenchard (First Round Capital), Immad Akhund (Y Combinator)
DianaHR
SeedSep 2025$4M
Pre SeedFeb 2024$500K
$4.5M
Co-investors: Justin Kan (Goat Capital), Mike Miller (Liquid 2 Ventures), Jonathan Ehrlich (Foundation Capital), Yuri Sagalov (10100), Immad Akhund (Y Combinator), Kevin Mahaffey (Lookout), Emmett Shear, Arash Ferdowsi

Michael Seibel's Experience

Partner Emeritus Y Combinator2025 - Present
Finance Director BlueStone Capital Partners, L.P.Present
Finance Director ruby labsPresent
CEO BlueStone Capital Partners, L.P.Present
CEO ruby labsPresent
Finance Director Robyn FrankelPresent
CEO Robyn FrankelPresent
Finance Director IT CRUX Mobile Apps SolutionsPresent
CEO IT CRUX Mobile Apps SolutionsPresent
Partner Y Combinator2014 - 2025
Part-time Partner Y Combinator2013 - 2014
CEO Mfume for US Senate 20062011 - 2014
CEO Minttown2011 - 2014
CEO Center for Rural Health Leadership2011 - 2014
CEO Sm4rt Predictive Systems2011 - 2014
CEO NewCo2011 - 2014
CEO Top-Patents2011 - 2014
CEO Socialcam2011 - 2014
CEO Twitch2006 - 2011
CEO Justin.tv2006 - 2011
Finance Director Minttown2005 - 2006
Finance Director Center for Rural Health Leadership2005 - 2006
Finance Director Sm4rt Predictive Systems2005 - 2006
Finance Director NewCo2005 - 2006
Finance Director Top-Patents2005 - 2006
Finance Director Mfume for US Senate 20062005 - 2006

Michael Seibel's Education

Yale University BA Political Science