Ruben Mier, Operating Partner at Sumeru Equity Partners is an active investor based in San Diego, California. This profile covers what Ruben Mier backs, at which stage, and how founders can reach out in 2026.
Ruben Mier is an Operating Partner at Sumeru Equity Partners, a demand-centric growth marketer with a focus on disciplined execution and prioritization.
Ruben Mier invests in SaaS & Enterprise, Consumer & Retail and Marketing & AdTech, typically at Early Stage Venture and Late Stage Venture.
- Investor type
- PE
- Stages
- Early Stage VentureLate Stage Venture
- Invests in
- SaaS & EnterpriseConsumer & RetailMarketing & AdTech
- Location
- San Diego, California
- Typical check
- $3.8M
How to reach Ruben Mier
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About this profile
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Cite this page
Round Funded. "Ruben Mier." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/ruben-mier
Frequently Asked Questions
Who is Ruben Mier?
Ruben Mier, Operating Partner at Sumeru Equity Partners is an active investor based in San Diego, California. Ruben Mier invests in SaaS & Enterprise, Consumer & Retail and Marketing & AdTech, typically at Early Stage Venture and Late Stage Venture.
What does Ruben Mier invest in?
Ruben Mier invests in SaaS & Enterprise, Consumer & Retail and Marketing & AdTech, typically at Early Stage Venture and Late Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Ruben Mier invest at?
Ruben Mier typically invests at Early Stage Venture and Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Ruben Mier's typical check size?
Ruben Mier typically writes checks around $3.8M. Use it as a signal for whether your raise fits their stage.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.