Charles Miller
Principal at O2 Investment Partners
Detroit, Michigan
Charles Miller, Principal at O2 Investment Partners is an active investor based in Detroit, Michigan. This profile covers what Charles Miller backs, at which stage, and how founders can reach out in 2026.
- Investor type
- VCPE
- Stages
- SeedSeries ASeries BLate Stage Venture
- Invests in
- FintechSaaS & EnterpriseClimate & EnergyCybersecurityManufacturing & IndustrialMedia & ContentSocial & CommunityGovTech & Defense
- Location
- Detroit, Michigan
- Typical check
- $2M
- Past investments
- 8
Notable investments
SIB Fixed Cost Reduction
National Technologies
IROA Technologies LLC
Vessco, Inc.1 Priority Environmental Services
Flip Electronics
EMEX
Fairhaven Integration ServicesHow to reach Charles Miller
Angels and operators like Charles Miller reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded Accelerator.
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Frequently Asked Questions
What does Charles Miller invest in?
Charles Miller invests in Fintech, SaaS & Enterprise, Climate & Energy and Cybersecurity, typically at Seed, Series A, Series B and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Charles Miller invest at?
Charles Miller typically invests at Seed, Series A, Series B and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Charles Miller's typical check size?
Charles Miller typically writes checks around $2M. Use it as a signal for whether your raise fits their stage.
How do I contact Charles Miller?
Unlock Charles Miller's verified email on Round Funded Accelerator and send a personalized pitch. We surface only deliverable contacts so your outreach lands.