Matthew Walsh is a Founding Partner at Castle Island Ventures. He previously served as a Vice President at Fidelity Investments.

What Matthew can write

Writes checks ofNot reported
Comes in atSeed, Series ACan lead the round
Email the firm[email protected]The firm's own inbox for founders.

Career

  1. Fidelity Investments · Vice President
  2. Castle Island Ventures · Founding Partner
    Now

Companies founded

Castle Island Ventures

Investments named in public bios

Coin MetricsDust IdentityGromaHidden RoadNotabeneStation 70

Focus

financial servicesenterprise softwarecybersecurity

Education

Babson College, BS in Business AdministrationDuke University’s Fuqua School of Business, MBA

Also at Castle Island Ventures

Partners like Matthew

At firms with a similar stage, sector and check size.

Alert me when Castle Island Ventures is active

One email when Matthew's firm raises a fund, adds a partner or shows new activity.

Founders and investors at a Mode VC gathering

Send Mode VC your deck

Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.

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Questions

Who is Matthew Walsh?

Matthew Walsh is a Founding Partner at Castle Island Ventures. He previously served as a Vice President at Fidelity Investments.

How much does Matthew Walsh invest?

Castle Island Ventures has not reported a check size. It invests at seed, series a.

How do I pitch Matthew Walsh?

Email [email protected], the firm's inbox for founders, and name Matthew in the subject. A warm intro from a founder Castle Island Ventures backed works better.

What did Matthew Walsh do before Castle Island Ventures?

Vice President at Fidelity Investments.

Last updated 2026-10-15. Is this you? Ask for a correction.