Investing Profile

John Brennan

InvestorVC
Founder & Managing Partner at Holly Ventures
ylventures.com/people/john-br...San Francisco Bay Area
Photo of John Brennan, Managing Partner at Holly Ventures
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Networks John is a member of
The University of Chicago Booth School of Business Network
137 CONNECTIONS
YL Ventures Network
19 CONNECTIONS
Trinity College-Hartford Network
14 CONNECTIONS
Hunters Network
11 CONNECTIONS

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Current Investing Position
Holly Ventures Managing Partner
Investment Range
$200K - $5.0M
Sweet Spot
$2.0M
Investments On Record
7

John Brennan is on these Sector & Stage Rankings

John Brennan's Investments On Record (6)

CompanyStageDateRound SizeTotal Raised
Spera
SeedMar 2023$10M
$10M
Co-investors: Michael Sutton (Blu Venture Investors)
Valence Security
Series AOct 2022$25M
SeedOct 2021$7M
$32M
Co-investors: Michael Sutton (Blu Venture Investors), Mony Hassid (Microsoft Ventures), Shay Banon (Elastica acquired by Symantec), Michael Fey, Benny Schnaider
Opus Security
SeedSep 2022$10M
$10M
Co-investors: Udi Mokady (Cyberstarts VC), Oliver Friedrichs (CrowdStrike), Michael Sutton (Blu Venture Investors), George Kurtz
Eureka Security
SeedJan 2022$8M
$8M
Co-investors: Ben Bernstein, Assaf Rappaport
Vulcan Cyber
Series BMar 2021$21M
$69M
Co-investors: Mark Hatfield (Ten Eleven Ventures), Michael Sutton (Blu Venture Investors), Henry Mason (Dawn Capital)
build.security
SeedNov 2020$6M
$6M
Co-investors: Dan Amiga (Cyberstarts VC), Michael Sutton (Blu Venture Investors), Eyal Gruner (Cyberstarts VC), George Kurtz

John Brennan's Experience

Seed Investor Vulcan Cyber, a Tenable CompanyPresent
Seed Investor Vulcan CyberPresent
Seed Investor HuntersPresent
Seed Investor Orca SecurityPresent
Seed Investor SatoriPresent
Seed Investor CycodePresent
Seed Investor build.security (acquired by Elastic)Present
Seed Investor enso.security (Part of Snyk)Present
Seed Investor enso.securityPresent
Seed Investor Grip SecurityPresent
Seed Investor Valence SecurityPresent
Seed Investor Autonomous SecurityPresent
Seed Investor MCPTotalPresent
Seed Investor Eureka Security (Acquired by Tenable)Present
Seed Investor Eureka SecurityPresent
Seed Investor Opus Security (Now Part of Orca Security)Present
Seed Investor Spera, now Okta ISPMPresent
Seed Investor Aim Security (Now part of Cato Networks)Present
Seed Investor GutsyPresent
Seed Investor Miggo SecurityPresent
Seed Investor MINDPresent
Seed Investor VenicePresent
Seed Investor AsteliaPresent
Senior Partner YL VenturesPresent
Founder & Managing Partner Holly VenturesPresent

John Brennan's Education

Trinity College-Hartford BS Economics, Political Science
The University of Chicago Booth School of Business Master of Business Administration (MBA) Entrepreneurship & Finance