William Allen

Active Investor

Founder | General Partner at Subrosa Ventures

Palo Alto, California

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William Allen, Founder | General Partner at Subrosa Ventures is an active investor based in Palo Alto, California. This profile covers what William Allen backs, at which stage, and how founders can reach out in 2026.

William Allen is a Founder and General Partner at Subrosa Ventures, an early-stage venture capital fund investing in commercial software and industrial technology.

William Allen invests in SaaS & Enterprise and Manufacturing & Industrial, typically at Early Stage Venture.

Location
Palo Alto, California
Typical check
$500K

What does William Allen invest in?

Investor type
VC
Stages
Early Stage Venture

Where is William Allen based?

William Allen is based in Palo Alto, California.

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How to reach William Allen

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About this profile

This profile is part of Round Funded, an investor database and outreach platform for founders. It covers 60,000+ active VCs, angels, family offices and accelerators with verified contacts, lets you send pitches from your own Gmail, and includes a free Data Room for your raise. How this data is built.

Cite this page

Round Funded. "William Allen." Round Funded investor database, updated September 22, 2026.

Stable URL, it will not change: https://www.roundfunded.com/en/investor/william-allen

Frequently Asked Questions

Who is William Allen?

William Allen, Founder | General Partner at Subrosa Ventures is an active investor based in Palo Alto, California. William Allen invests in SaaS & Enterprise and Manufacturing & Industrial, typically at Early Stage Venture.

What does William Allen invest in?

William Allen invests in SaaS & Enterprise and Manufacturing & Industrial, typically at Early Stage Venture. Match your sector and stage, then reach out with a personalized pitch.

What stage does William Allen invest at?

William Allen typically invests at Early Stage Venture. Lead with traction that fits the stage when you reach out.

What is William Allen's typical check size?

William Allen typically writes checks around $500K. Use it as a signal for whether your raise fits their stage.

Where is William Allen based?

William Allen is based in Palo Alto, California.

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.

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