Sean O Brien

Portfolio Companies 2026 for Sean O Brien: investors, rounds, and co-investor patterns from StartupFundraising.com research, updated for 2026.

Sean O Brien covers 29 companies with a founder-verified check from Sean O Brien, concentrated in Biotech, Climate, AI Infrastructure. Round sizes are not disclosed for these companies, so this report lists the verified positions rather than dollar totals.

Verified portfolio companies: 29
Sector mix: Biotech 8 · Climate 7 · AI Infrastructure 5 · Robotics 3
Headquarters mix: San Francisco 5 · Newark 3 · New York 2 · Madrid 1

Sean O Brien — verified positions

YPLASMA
Sharper Sense
Puna Bio
Avalo
Hoofprint Biome
Navlive
Ria Health
Danu Robotics
Scindo
FloVision Solutions
Oxyle
Cephia AI
Asterix Foods
Hyperlume
Still Bright
EVERBLOOM
Mitico
Fig Investments
Algoma
Afynia Laboratories
Fermeate
OneSkin
Gynius
Nascent Materials
xRobotics
Kenyi Technologies
NOC Energy
Aspect Aerospace
Cocoon

Sean O'Brien — related firms and companies (56)

Sean O'Brien profile · All research reports