Investing Profile

Geoff Ralston(1)

VCInvestorAngel
Partner at Y Combinator
blog.ycombinator.com/author/g...Sunnyvale, California
Photo of Geoff Ralston, Partner at Y Combinator
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Networks Geoff is a member of
NewCo Network
1586 CONNECTIONS
NewCo Network
1586 CONNECTIONS
NewCo Network
1586 CONNECTIONS
NewCo Network
1586 CONNECTIONS
NewCo Network
1586 CONNECTIONS

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Current Investing Position
Y Combinator Partner
Investment Range
$150K - $150K
Sweet Spot
$150K
Investments On Record
47

Geoff Ralston is on these Sector & Stage Rankings

Geoff Ralston's Investments On Record (40)

CompanyStageDateRound SizeTotal Raised
Asymmetric Security
Pre SeedJan 2026$4M
$4M
Co-investors: Chad Byers (Susa Ventures), Matt Clifford (Entrepreneur First), Charlie Songhurst
Locunity
Pre SeedJul 2025$230K
$230K
Rain Industries
SeedSep 2023$10M
$10M
Co-investors: Nancy Pfund (DBL Partners), Immad Akhund (Y Combinator), Steve Blank (National Institutes Of Health)
Aesthetic
SeedApr 2020$3M
$6.1M
Co-investors: Michael Ma (Liquid 2 Ventures), Ben Orthlieb (Linkedin), Brian Pokorny (SV Angel LLC), Ronny Conway (A Capital), Paul Buchheit (Y Combinator), Alex Sok, Ronny Conway, Sumon Sadhu, Adrian Aoun
Elpha
SeedNov 2019$1M
$2.1M
Co-investors: Michael Seibel (Y Combinator), Theresa Johnson (Uncommon Ventures)
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: Vijay Pande (Andreessen Horowitz), Zal Bilimoria (Refactor Capital), Bryan Frist (Friále), Aneel Ranadive (Soma Capital), Tim Brady (Y Combinator), Riley Rodgers (Valia Ventures), Jordan Fudge (Sinai Ventures), Chris Anderson
Oolu
Series AOct 2017$3M
SeedAug 2015
$3M

Geoff Ralston's Experience

Angel Investor and Small Company Advisor Raltech, LLCPresent
Advisor / Judge California Clean Tech OpenPresent
SVP/GM Communications Yahoo!Present
VP Engineering Four11, IncPresent
Various Hewlett Packard EnterprisePresent
President Y CombinatorPresent
Founder SAIF (Safe AI Fund)Present
Founder SAIF - The Safe Artificial Intelligence FundPresent
Various HPPresent
Founder NewCoPresent
President NewCoPresent
Angel Investor and Small Company Advisor NewCoPresent
Partner NewCoPresent
Advisor / Judge NewCoPresent
Chief Product Officer yahooPresent
VP Engineering NewCoPresent
Founder The Academic College of Tel-Aviv, YaffoPresent
President The Academic College of Tel-Aviv, YaffoPresent
Angel Investor and Small Company Advisor The Academic College of Tel-Aviv, YaffoPresent
Partner The Academic College of Tel-Aviv, YaffoPresent
CEO LalaPresent
Advisor / Judge The Academic College of Tel-Aviv, YaffoPresent
VP Engineering The Academic College of Tel-Aviv, YaffoPresent
VP Engineering Center for Rural Health LeadershipPresent
President Center for Rural Health LeadershipPresent
Founder Center for Rural Health LeadershipPresent
Angel Investor and Small Company Advisor Center for Rural Health LeadershipPresent
Partner Center for Rural Health LeadershipPresent
Advisor / Judge Center for Rural Health LeadershipPresent
Founder University of Washington Applied Physics LaboratoryPresent
President University of Washington Applied Physics LaboratoryPresent
Angel Investor and Small Company Advisor University of Washington Applied Physics LaboratoryPresent
Partner University of Washington Applied Physics LaboratoryPresent
Advisor / Judge University of Washington Applied Physics LaboratoryPresent
SVP/GM Communications yahooPresent
VP Engineering yahooPresent
VP Engineering University of Washington Applied Physics LaboratoryPresent
Partner Y Combinator2011 - 2019
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

Geoff Ralston's Education

Dartmouth College Bachelor of Arts (B.A.) Computer Science
Stanford University MS CS Computer Science and Electrical Engineering
INSEAD MBA Business