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Boulder startup funding

New funding rounds by startups based in Boulder, Colorado, from SEC Form D filings.

Updated Nov 11, 2026·Totals cover Form D filings Nov 13, 2025 to Nov 13, 2026

34 startups in Boulder filed a Form D in the last 12 months. Together they reported $345.8M sold in 34 new rounds. The median round was $2.5M.

Startups
34
filed in 12 months
Reported new funding
$345.8M
34 rounds
Median round
$2.5M
new rounds
Top industry
by startups filing

Largest rounds

1
$125.0M8 investors
2
$29.4M83 investors
3
Alta Resource Technologies, Inc.
Not classified yetfiled Dec 2025
$28.3M17 investors
4
$25.9M17 investors
5
RADICL Defense, Inc.
Not classified yetfiled Feb 2026
$20.9M16 investors
6
Arpeggio Biosciences, Inc.
Not classified yetfiled Nov 2025
$20.0M12 investors
7
Afference Inc.
Not classified yetfiled Dec 2025
$15.3M19 investors
8
$12.9M10 investors
9
Mesa Quantum Systems, Inc.
Not classified yetfiled Jan 2026
$11.2M7 investors
10
Credible Data, Inc.
Not classified yetfiled Feb 2026
$10.3M29 investors

Latest filings

Boulder companies 102

102 companies
CompanyIndustryCityLatest filingLatest raise
Not classified yetBoulderOct 31, 2018$14.2M
Consumer & RetailBoulderJun 11, 2013$8.2M
How this page is built

Startups are the private companies counted as startups (see our startup funding data), placed by the address on their latest Form D. Registered-agent and virtual-office addresses are not counted as a location. Public companies, foreign issuers and business-combination filings are excluded.