Stephen O'Brien is an Investor at Mantis Venture Capital, whose known portfolio counts 9 companies.
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Investment focus
Contacts
Affiliated funds' portfolios
Investor at Mantis Venture Capital, whose known portfolio counts 9 companies
- Rogo
- Factory
- depthfirst
- Monaco
- Sandstone
- Doctronic
- AIM
- Project Omega
- Scanner.dev
Investor Profile
Stephen O'Brien is listed against sectors AI, Commerce, Consumer and FinTech, and focus areas Analytics, Cloud Infrastructure, Content and Creator Economy in the database.
Mantis Venture Capital appears in Growth, Seed and Series A rounds across its known deals.
The firm portfolio and the focus above give founders context on whether Stephen O'Brien matches their raise.
Colleagues at Mantis Venture Capital
Mark J. Ladd
Limited Partner
Jackson, United States
Josh Klein
General Partner
Beverly Hills, United States
Jeffrey Evans
Founder & Co-Managing Partner
Los Angeles, United States
Gaurav Bhogale
Principal
San Francisco, United States
George Bousis
Advisor
Miami Beach, United States
Frequently asked questions
Who is Stephen O'Brien?
Stephen O'Brien is a venture capital investor based in Los Angeles, California, United States, listed as Investor at Mantis Venture Capital. The known portfolio of that firm counts 9 companies. That portfolio belongs to the firm, not to Stephen O'Brien personally.
What does Stephen O'Brien invest in?
Listed sectors include AI, Commerce, Consumer and FinTech; listed focus areas include Analytics, Cloud Infrastructure, Content and Creator Economy. Those tags come from the portfolios of the firms this profile is attached to, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Stephen O'Brien invest at?
Mantis Venture Capital appears in Growth, Seed and Series A rounds across its known deals, and Stephen O'Brien is listed there as Investor. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
Which firm is Stephen O'Brien listed at?
Stephen O'Brien is listed as Investor at Mantis Venture Capital. 5 other people in the database share a firm with Stephen O'Brien.
How do I contact Stephen O'Brien?
A LinkedIn page is on file for Stephen O'Brien. It is readable inside RaiseHunt after you create an account. The database holds no email address and no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal