Investing Profile

Geoff Ralston(1)

VCInvestorAngel
President and Partner at Y Combinator
blog.ycombinator.com/author/g...Sunnyvale, California
Photo of Geoff Ralston, President at Y Combinator
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Networks Geoff is a member of
Yahoo! Network
47 CONNECTIONS
Yahoo! Network
47 CONNECTIONS
Y Combinator Network
38 CONNECTIONS
Hewlett-Packard Network
21 CONNECTIONS

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Current Investing Position
Y Combinator President
Investment Range
$150K - $150K
Sweet Spot
$150K
Investments On Record
44

Geoff Ralston is on these Sector & Stage Rankings

Geoff Ralston's Investments On Record (39)

CompanyStageDateRound SizeTotal Raised
Locunity
Pre SeedJul 2025$230K
$230K
Rain Industries
SeedSep 2023$10M
$10M
Co-investors: Steve Blank (M34 Capital), Nancy Pfund (DBL Partners), Nat Friedman (C2 Investment), Kareem Dabbagh (VoLo Earth Ventures), Daniel Gross (C2 Investment), Dylan Field, John Collison, Immad Akhund
Aesthetic
SeedApr 2020$3M
$6.1M
Co-investors: Brian Pokorny (SV Angel), Paul Buchheit (Y Combinator), Ronny Conway (A Capital), Katey Caldwell (Twenty Two Ventures), Brad Flora (Y Combinator), Dalton Caldwell (Y Combinator), Ben Orthlieb (2.12 Angels), Ronny Conway, Sumon Sadhu, Alex Sok, Adrian Aoun, Michael Ma
Elpha
SeedNov 2019$1M
$2.1M
Co-investors: Michael Seibel (Y Combinator), Theresa Johnson, Leah Culver
Next Tech
SeedAug 2018$1M
$1M
Co-investors: Alireza Masrour (Plug & Play Ventures), Tim Brady (Y Combinator)
Shield Bio
Series AMay 2018$8M
SeedFeb 2017$4M
$12M
Co-investors: Josh Buckley (Buckley Ventures), Zal Bilimoria (Refactor Capital), Jordan Fudge (Sinai Ventures), Aneel Ranadive (Soma Capital), Bryan Frist (Friále), Tim Brady (Y Combinator), Enke Bashllari (Arkitekt Ventures), Riley Rodgers (Valia Ventures), Vijay Pande (VZVC), Justin Mateen, Sean Rad, Chris Anderson
Oolu
Series AOct 2017$3M
SeedAug 2015
$3M
Dost Education
SeedMar 2017
Co-investors: Tim Brady (Y Combinator), Joe Greenstein

Geoff Ralston's Experience

Partner Y Combinator2011 - Present
Founder Imagine K122011 - 2016
CEO Lala Media2007 - 2009
Chief Product Officer Yahoo!2003 - 2006
SVP/GM Communications Yahoo! Inc1999 - 2003
VP Engineering Yahoo!1997 - 1999
VP Engineering Four111995 - 1997
Various Hewlett-Packard1982 - 1992