ClearSky is a venture capital and growth equity firm investing in innovative companies in the cybersecurity and energy transition sectors. The firm has managed approximately $1 billion in capital commitments across multiple funds, including ClearSky Security Fund I and ClearSky Power & Technology Fund II.
36% of their portfolio is in Cybersecurity. Deal activity decreased year-over-year (1 deal in the last 12 months vs 5 prior). Average disclosed round size is $44.4M (across 71 rounds with reported amounts).
Portfolio
40
Fund Size
$1B
Top Stage
Series B
Last 12 Mo
1
Team
AW
Alex Weiss
CEO, Co-Founder & Managing Partner
JH
James Huff
Co-Founder & Managing Partner
JL
Jay Leek
Managing Partner and Co-Founder
OS
Owen Santos
Analyst
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
75 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Ubicquia | Series D | $106M | Feb 2026 |
| Ubicquia | Series D | $106M | Jan 2026 |
 Guardz | Series B | $56M | Jun 2025 |
| GGuardz Cyber Ltd | Series B | $56M | Jun 2025 |
 Mitiga | Series B | $30M | Jan 2025 |
| MMitiga Security Inc | Series B | $30M | Jan 2025 |
| MMitiga Security Inc | Growth | $30M | Jan 2025 |
 Mainspring Energy, Inc. | Series F | $258M | Jan 2025 |
| GGuardz Cyber Ltd | Series A | $18M | Jan 2025 |
| Guardz | Series B | $84M | Jan 2025 |
 Axis Security | Series C | $100M | Nov 2024 |
 Human | Growth | $50M | Oct 2024 |
 Hatz AI | Seed | $2.5M | Jan 2024 |
 EdgeQ | Series B | $75M | Apr 2023 |
 EdgeQ | Series B | $75M | Apr 2023 |
| Mitiga | Series A | $45M | Mar 2023 |
 Revelstoke Security | Series B | $20M | Mar 2023 |
| Guardz | Series A | $18M | Jan 2023 |
| MMitiga Security Inc | Series A | $45M | Jan 2023 |
 Revelstoke | Series B | $20M | Jan 2023 |
 OhmConnect | Series D | $55M | Jun 2022 |
 AppOmni | Series C | $70M | Jun 2022 |
| TT Rex Group Inc | Series C | $40M | Jan 2022 |
| AppOmni | Series C | $70M | Jan 2022 |
| CCleartrace Technologies Inc | Unknown | $20M | Jan 2022 |
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Top Co-Investors
Glilot Capital Partners13 shared
SYN Ventures10 shared
Blackstone Inc.10 shared
Atlantic Bridge8 shared
Bessemer Venture Partners8 shared
Scale Venture Partners8 shared
MassMutual8 shared
DNX Ventures7 shared
Endeavor6 shared
Salesforce Ventures6 shared
Crosslink Capital5 shared
Hanaco Ventures5 shared
Costanoa Ventures4 shared
Salesforce4 shared
The Goldman Sachs Group, Inc.4 shared
GKFF Ventures4 shared
Plug and Play Tech Center4 shared
Intel Capital4 shared
General Catalyst4 shared
Samsung Next3 shared
Last updated: 20 October 2026