United States · 
What does Thin Line Capital invest in?
Thin Line Capital invests most often at Seed and Series A (100% of the rounds on record), in sectors such as Cleantech, Sustainability and Smart Grid.
Thin Line Capital highlights
- 01
2 cheques in the last 12 months
- 02
Mostly Seed and Series A: 100% of its rounds
What they do
We at Thin Line Capital are entrepreneurs, like you. We have started six climate-tech companies, including two unicorns.From their own website
- Type
- VC firm (from a list, unverified)
- Cheque size
- $400K – $600K as they say
- Stages
- SeedSeries A
- Sectors
- CleantechSustainabilitySmart Grid
- Based in
- Pasadena, United States
- Cold pitches
- Not stated
The record
Every round we can evidence, newest first3 appearances
- 2026
2 rounds
- Oct
- Aug
- 2025
1 round
- Oct
An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.
The team
Named by the firm itself, on a filing, its Form ADV or its company registration1 named
ADAaron Dunsmore FykePrincipal and Founder of the ManageriFiling they signed
We also hold 2 people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.
What the register says
From the firm's own filings with the SEC, which it must file accurately by law
$31Mgross assets of its fundsOct 2026
Exemptreporting adviserventure or small private funds
- Legal name
- THIN LINE Capital, LLC
- SEC number
- CRD 304900
What they claim to have backed
From their own portfolio page (on their website)
8 of 18 we have independently watched raise
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Weaker than a round we watched, stronger than a list somebody sold us. A firm is far less willing to put a company on its own site that it never funded.