ClearSky
VC Fund
North Palm Beach, United States
ClearSky is a venture capital/growth equity group that invests in innovative companies, with a special focus on (i) technologies driving the energy transition, climate related technologies, and sustainability, (ii) the digital transformation of enterprise customers’ operations and communications, and (iii) disruptive solutions forcybersecurity, industrial security, and critical infrastructure security.
- Total investments:
- 94
- Last investment:
- Lead investor:
- 34%
- Fund size:
- $210M
- Last fund:
Last updated:
For AI agents: llms.txt
Industries ClearSky invests in
Stages ClearSky invests in
Countries ClearSky invests in
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Investment Focus
Industry
- Software 27 (29%)
- Cyber Security 24 (26%)
- Security 13 (14%)
- Cloud Security 13 (14%)
- Information Technology 13 (14%)
Stage
- Series B 23 (24%)
- Series A 18 (19%)
- Series C 15 (16%)
- Series D 11 (12%)
- Funding Round 6 (6%)
Country
- United States 54 (57%)
- Israel 2 (2%)
- Spain 1 (1%)
- Canada 1 (1%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Alexander Weiss
CEO, Co-Founder & Managing Partner
|
CEO, Co-Founder & Managing Partner | Total investments: 8 | Find email | |
Austin Summers
Investment Professional
|
Investment Professional | Total investments: 0 | Find email | |
Bernard Noble
Managing Director
|
Managing Director | Total investments: 0 | Find email | |
Bob Rauch
Managing Director
|
Managing Director | Total investments: 0 | Find email | |
Erik Straser
Managing Director
|
Managing Director | Total investments: 12 | Find email | |
| See all 10 team members → | ||||
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Ubicquia
|
Ubicquia offers municipalities, utilities, broadband service providers, and lighting manufacturers a cost-effective and expandable platform for deploying simply connected, simply smart broadband, small cell, and smart city services. Its plug and play network has the ability to turn any street light into a multi-function router that supports agrowing list of services that include advanced lighting controls, public WiFi, and the connection to 3rd party sensors including air quality monitors and surveillance cameras. | $106M / Series D / Feb 23, 2026 | |
Guardz
|
In a world that lives on digital, every business is at risk. That has been a problem for small and growing businesses, because most solutions are too cumbersome, too complicated and far too costly. That’s why we created Guardz. We curated and re-engineered the cutting-edge technology and tools that small businesses need into one, to make anaccessible, affordable way for small businesses to protect their business. We also added the ability to use their new security posture to access affordable cyber insurance. The right protection. The right price. Cybersecurity Peace of Mind. Guardz protects your business, so you can focus on building it. | $56M / Series B / Jun 09, 2025 | |
XGS Energy
|
XGS Energy is a geothermal heat harvesting technology company. | $13M / Mar 26, 2025 | |
Mitiga
|
Securing the Cloud is challenging and elusive. SaaS sprawl and expanding identity surfaces outpace traditional security tools. Preventive controls miss the mark on real-time detection. Visibility gaps grow. Attackers get in. Mitiga helps you fight back—faster. Our Cloud Detection and Response (CDR) platform accelerates response times by 90 percentand delivers full visibility across Identity, Cloud Infrastructure, SaaS and AI.Built by incident responders for incident responders, Mitiga is the only platform that connects all three layers—so you can detect threats earlier, contain lateral movement, and resolve incidents before they spread.With over 1,000 days of forensic log history and a powerful investigation workbench, Mitiga keeps your team ready to respond at any moment. No noise. No blind spots. No delay.Trusted by Fortune 500 enterprises. Easy to deploy. Designed for today’s cloud threats.Attacks will happen. What matters is how fast you bounce back. | $30M / Series B / Jan 21, 2025 | |
Human Security
|
HUMAN is a cybersecurity company that protects enterprises from bot attacks to keep digital experiences human. We have the most advanced Human Verification Engine that protects applications, APIs and digital media from bot attacks, preventing losses and improving the digital experience for real humans. Today we verify the humanity of more than 10trillion interactions per week for some of the largest companies and internet platforms. Protect your digital business with HUMAN. To Know Who’s Real, visit www.humansecurity.com. | $50M / Venture - Series Unknown / Oct 09, 2024 | |
|
Guardz
|
In a world that lives on digital, every business is at risk. That has been a problem for small and growing businesses, because most solutions are too cumbersome, too complicated and far too costly. That’s why we created Guardz. We curated and re-engineered the cutting-edge technology and tools that small businesses need into one, to make anaccessible, affordable way for small businesses to protect their business. We also added the ability to use their new security posture to access affordable cyber insurance. The right protection. The right price. Cybersecurity Peace of Mind. Guardz protects your business, so you can focus on building it. | $18M / Series A / Dec 13, 2023 | |
EdgeQ
|
EdgeQ is an information technology company that specializes in the fields of 5G chip systems. The company is pioneering converged connectivity and AI that is fully software-customizable and programmable. It was founded in 2018 and headquartered in Santa Clara, California. | $75M / Series B / Apr 19, 2023 | |
|
Mitiga
|
Securing the Cloud is challenging and elusive. SaaS sprawl and expanding identity surfaces outpace traditional security tools. Preventive controls miss the mark on real-time detection. Visibility gaps grow. Attackers get in. Mitiga helps you fight back—faster. Our Cloud Detection and Response (CDR) platform accelerates response times by 90 percentand delivers full visibility across Identity, Cloud Infrastructure, SaaS and AI.Built by incident responders for incident responders, Mitiga is the only platform that connects all three layers—so you can detect threats earlier, contain lateral movement, and resolve incidents before they spread.With over 1,000 days of forensic log history and a powerful investigation workbench, Mitiga keeps your team ready to respond at any moment. No noise. No blind spots. No delay.Trusted by Fortune 500 enterprises. Easy to deploy. Designed for today’s cloud threats.Attacks will happen. What matters is how fast you bounce back. | $13M / Series A / Mar 14, 2023 | |
Revelstoke
|
Revelstoke radically simplifies security orchestration, automation and response (SOAR), so security teams can work faster, smarter and more effectively. | $20M / Series B / Mar 08, 2023 | |
RenewWest
|
RenewWest is a climate, finance, and land management company that speed carbon projects up, from start to finish. Their simplified project development approaches handles financing, carbon inventory, offset registration, and MRV to maximize capital deployed and efficiently generate environmental benefits.Founded in 2015, RenewWest is headquarteredin Denver, Colorado, United States. | $3.2M / Seed / Nov 14, 2022 | |
| See all 94 investments → | |||
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FAQ
What does ClearSky invest in?
ClearSky invests primarily in Software, Cyber Security and Security startups, most often at Series B and Series A stage. Most of the 94 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact ClearSky?
Public channels for ClearSky include LinkedIn and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
Who are the partners at ClearSky?
The team at ClearSky includes Alexander Weiss (CEO, Co-Founder & Managing Partner), Austin Summers (Investment Professional) and Bernard Noble (Managing Director), among 10 team members tracked by Shizune. The Team section lists each member with their title, investment count and links.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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