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Clearsky Advisors LLC

MAINSPRING FUNDING LLC

Open, writing first checks

Open: first sale Feb 2023, per Form D (fund age approximates vintage)

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Vintage
2023
Fund size
$6.83M to $10M (Form D)
Stages
Not stated
Sectors
Cybersecurity, Energy
Regions
Not stated

01 · Thesis

ClearSky is a venture capital and growth equity firm investing in innovative companies in the cybersecurity and energy transition sectors, focusing on technology solutions that power the energy transition and disruptive cybersecurity technologies.Inferred from the firm's website

02 · Initial check

$68K to $167K (estimated from fund size)

Estimated from Form D: $6.83M sold of a $10M target

03 · Who to approach

Named on this fund's Form D

  • Alex Weiss, CEO, Co-Founder & Managing Partner

04 · Deals

No deals attributed to this fund yet.

05 · Evidence

  • Firm-wideClearSky is a venture capital and growth equity firm investing in innovative companies in the cybersecurity and energy transition sectors.

    ClearSky is a venture capital and growth equity firm investing in innovative companies in the cybersecurity and energy transition sectors
    https://www.clear-sky.com/

06 · Sources

  1. https://www.clear-sky.com/
  2. https://www.sec.gov/Archives/edgar/data/1969148/000196914823000001/

Last verified: Oct 28, 2026