Mari Castillo, partner at beta capital management is an active investor based in middletown, United States. This profile covers what Mari Castillo backs, at which stage, and how founders can reach out in 2026.
Serves as a Partner at Beta Capital Management, L.P.
Mari Castillo typically invests at Late Stage Venture.
- Investor type
- Investment Partner
- Stages
- Late Stage Venture
- Location
- middletown, United States
- Typical check
- $7M
How to reach Mari Castillo
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Round Funded. "Mari Castillo." Round Funded investor database, updated November 3, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/mari-castillo
Frequently Asked Questions
Who is Mari Castillo?
Mari Castillo, partner at beta capital management is an active investor based in middletown, United States. Mari Castillo typically invests at Late Stage Venture.
What stage does Mari Castillo invest at?
Mari Castillo typically invests at Late Stage Venture. Lead with traction that fits the stage when you reach out.
What is Mari Castillo's typical check size?
Mari Castillo typically writes checks around $7M. 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.