DiamondStream Partners

General contacts
Investor type

VC

Founded

2003

AUM

$50 M

Location

Seattle, Washington, United States

Investment Ticket

$10-50 m

Investment Stage

Seed Pre-seed Series A Series B Late Stage (Series C+)

Region of investment

Europe North America Australia and others
Investor profile last updated: 16 August, 2026

Profile

DiamondStream Partners is a venture capital firm based in Seattle, Washington, founded in 2003. The firm is led by a small team of professionals, including William Dean Donovan and David John Spurlock. DiamondStream Partners distinguishes itself by focusing on mobility transformation, particularly in the aerospace and aviation sectors, aiming to connect underserved markets through innovative air transportation solutions.

The firm primarily invests in middle-stage companies within the aerospace, aviation, hardware, and software sectors. It targets investments in the United States, Europe, and other English-speaking countries. DiamondStream Partners is known for its thematic investment approach, seeking companies that can stimulate market growth through new technologies. The firm does not publicly disclose its total assets under management.

Notable investments by DiamondStream Partners include Elroy Air, which develops autonomous aircraft systems; Ampaire, a leader in aircraft electrification; GPMS International, providing AI predictive maintenance software; Volantio, a SaaS platform for travel and entertainment industries; and AlarisPro, offering fleet management solutions for unmanned vehicles.

Industry

Aerospace Hardware Marketing and Advertising Media and Entertainment SaaS Software Transportation Travel

Contacts

Name
Title
Email
Social Networks
avatar
Brian Flynn Managing Director
Managing Director
b•••@•••
LinkedIn
avatar
William Dean Donovan Managing Director
Managing Director
d•••@•••
LinkedIn
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FAQs about DiamondStream Partners

DiamondStream Partners is a venture capital firm. It backs companies at Seed, Pre-seed, Series A, Series B and Late Stage (Series C+), writing tickets of $10-50 m.
DiamondStream Partners is located in Seattle, Washington, United States.
DiamondStream Partners was founded in 2003.
DiamondStream Partners invests in companies and startups in Aerospace, Hardware, Marketing and Advertising, Media and Entertainment, SaaS, Software, Transportation, Travel.
DiamondStream Partners invests in companies and startups in Europe, North America, Australia and others.
DiamondStream Partners invests in companies and startups at Seed, Pre-seed, Series A, Series B, Late Stage (Series C+).
DiamondStream Partners usually invests $10-50 m on average.
DiamondStream Partners has around $50m assets under management.
DiamondStream Partners can be reached through its website diamondstream.com, its LinkedIn page and its X account. Its general enquiries address is [email protected]. Cold-mailing a general inbox rarely reaches a partner, so Private Equity List also lists the investment-team contacts for DiamondStream Partners — names, roles, verified work emails and LinkedIn profiles — available on a Pro plan from $129/month (see pricing). Contacts are sourced from the firm's website and LinkedIn and re-verified on a rolling cycle. Spot a stale contact, or none at all? Report it — we re-run that firm within 48h and get back to you.
Yes. Every field on this page — profile, funds, investment criteria, portfolio and investment-team contacts — is available programmatically through the Private Equity List REST API and MCP server, so AI assistants such as Claude and ChatGPT can query DiamondStream Partners directly instead of scraping this page. One subscription covers both the web app and machine access — see API & MCP.
Private Equity List re-verifies investor profiles on a rolling cycle, pulling from the firm's own website and LinkedIn rather than a one-off import. This profile was last updated on 16 August, 2026. Something out of date here? Report it — we re-run that firm within 48h and get back to you.