VC firm
ClearSky
Also known as ClearSky Advisors LLC, ClearSky Power & Technology Fund I International Ltd., ClearSky Power & Technology Fund I LLC, Clearsky Power & Technology Fund II LLC, ClearSky Power Technology, ClearSky Security, Clearsky Security Fund I A, ClearSky Security Fund I LLC
- Investor type
- VC
- Investing status
- Activeas of 2026-09-18Source (opens in a new tab)
- Headquarters
- West Palm Beach, FL, United States
- Assets under management
- $1BStated by firm, as of 2026-09-18Source (opens in a new tab)
- Latest fund size
- $200MSEC amount sold, as of 2019-05-16Source (opens in a new tab)
- Funds
- 11
- Legal name
- ClearSky Advisors LLC
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Record updated 29 September 2026
About
ClearSky is a venture capital and growth equity firm investing in innovative companies in the cybersecurity and energy transition sectors, driving the safety of our digital landscape and global ecosystem.
Investment approach
- Thesis
- Cybersecurity and energy transition are dynamically related opportunities driven by long term forces – large and growing markets that will require significant innovation in early-stage technologies and successful execution in later-stage platforms.Source (opens in a new tab)
- Investing status notes
- ClearSky is currently actively investing primarily through the following major ClearSky Funds.
Funds
- MAINSPRING FUNDING LLC
- $6.8MVintage 2023, Main fund, SEC amount sold
- Clearsky Security Fund I-A LLC
- $34.5MVintage 2018, Main fund, SEC amount sold
- Clearsky Power & Technology Fund II LLC
- $200MVintage 2017, Main fund, SEC amount sold
- ClearSky Security Fund I LLC
- $245MVintage 2016, Main fund, SEC amount sold
- ClearSky Power & Technology Fund I International Ltd.
- $20.5MVintage 2011, SPV, SEC amount sold
- ClearSky Power & Technology Fund I LLC
- $254MVintage 2010, Main fund, SEC amount sold
- CLEARSKY SECURITY FUND I LLC
- Main fund
- MAINSPRING FUNDING LLC
- Main fund
- CLEARSKY FUND IV LP
- Main fund
- CLEARSKY POWER & TECHNOLOGY FUND I LLC
- Main fund
- CLEARSKY POWER & TECHNOLOGY FUND II LLC
- Main fund
SEC registration
- Registered adviser
- LEEK II, JAY ALAN
- CRD number
- 287492 (opens in a new tab)
- SEC file number
- 802-111741
- Registration
- Exempt reporting adviser
- Regulatory AUM
- $309Mas of 2026-03-27
- Private funds reported
- 1
- SEC CIK
- 1545427, 1545462, 1705289
Locations
- Office
- West Palm Beach, FL, United States
Programs
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