Investing Profile

Sean O'Sullivan(1)

InvestorVC
Managing Partner, SOSV
sosv.comNew York City
Photo of Sean O'Sullivan, Managing Partner at SOSV
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Sean O'Sullivan's investing connections

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1 Investor

Connected to David S. Rose (Rose Tech Ventures).

Find Sean O'Sullivan on

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Current Investing Position
SOSV Managing Partner
Investment Range
$100K - $5.0M
Sweet Spot
$1.5M
Investments On Record
136
Current Fund Size
$1.2B

Sean O'Sullivan is on these Sector & Stage Rankings

Sean O'Sullivan's Investments On Record (56)

CompanyStageDateRound SizeTotal Raised
Prellis Biologics
Series CMar 2025
Series CNov 2023
Series CAug 2022$35M
Series BJul 2021$19M
Convertible NoteJun 2021
Convertible NoteApr 2020
Convertible NoteMar 2018
SeedApr 2017$120K
$80M
Co-investors: Po Bronson (SOSV), Arvind Gupta (Mayfield), Rohit Sharma (True Ventures), Alireza Masrour (Plug & Play Ventures), Michael Marks (Celesta)
Flore by Sun Genomics
Convertible NoteNov 2024
Series BDec 2023
Series BNov 2022
Convertible NoteSep 2022
Series AJun 2020$9M
Convertible NoteOct 2019
SeedJan 2019$3M
SeedDec 2017
$12M
Co-investors: Po Bronson (SOSV), Arvind Gupta (Mayfield)
MixRift
Pre SeedAug 2024$2M
Pre SeedMay 2024
$2M
Co-investors: Lomax Ward (Outsized Ventures)
VALANX Biotech
SeedJul 2024
$100K
Co-investors: Bill Liao (SOSV), Florian Resch (IST cube)
GlowDx
Convertible NoteJun 2024
SeedJul 2022
Convertible NoteAug 2020
Pre SeedSep 2019$500K
Convertible NoteMay 2017$130K
Pre SeedJun 2015$100K
$730K
Co-investors: Bill Liao (SOSV)
Cell BioEngines
Pre SeedApr 2024$500K
Pre SeedAug 2023$250K
Pre SeedMar 2023$280K
$1M
Co-investors: Stephen Chambers (SOSV)
DropGenie
Convertible NoteMar 2024
SeedOct 2021
Convertible NoteMay 2020
SeedApr 2019
Co-investors: Bill Liao (SOSV)
Aequor
SeedJan 2024$200K
$200K