ClearSky

What ClearSky does

ClearSky Advisors LLC is a venture capital and growth equity fund manager founded in 2012 and headquartered in West Palm Beach, Florida, with a secondary office in Tel Aviv, Israel. The firm invests exclusively in two verticals: cybersecurity and energy transition. Capital is deployed through four primary funds — ClearSky Power & Technology Fund, ClearSky Security Fund, ClearSky Power & Technology Fund II, and ClearSky Fund IV — collectively representing approximately $1 billion in capital commitments across more than 60 portfolio companies and roughly 41 realized exits.

The firm does not develop or sell proprietary technology products. Its core product is capital and strategic support: equity investments ranging from convertible notes to Series B and beyond, supplemented by board participation, operational guidance, and an extensive network of founders, CEOs, VCs, and advisors. Notable realizations include Altamira ($375M sale to Parsons), Cylance ($1.4B sale to BlackBerry), NEXTracker ($330M sale to Flextronics), Inky (acquired by Kaseya), and Qwiet AI (acquired by Harness). Recent active investments include Renew Home, Query.AI, XGS Energy, EdgeQ, Mitiga, Ubicquia, and Guardz. ClearSky earns revenue through standard VC economics — recurring management fees on committed capital and carried interest on profitable exits — and markets its services to institutional and individual limited partners through direct relationships, an LP portal (Intralinks), LinkedIn, a quarterly newsletter, and industry events.

Operationally, ClearSky runs a lean team of 11–50 employees led by Co-Founders and Managing Partners Alex Weiss (CEO; formerly VP/CIO at NextEra Energy, with prior roles at Smith Barney, Paine Webber, and Morgan Stanley) and James Huff (formerly VP Emerging Technologies at NextEra Energy, plus Chicago Venture Partners and Deloitte). The broader investment committee and partner group includes veterans from Apollo (Ryan Crum, CTO/CISO), Stanford/Mohr Davidow (Erik Straser), Duke/NextEra (Robert Rauch), BlackRock's Global Infrastructure Partners and UBS (Daniel Furey, Head of Capital Formation), and Morgan Lewis (Howard Shecter, Executive Partner). The firm holds memberships in the Global Impact Investing Network, UN Principles for Responsible Investment, and Venture Climate Alliance, and operates a strategic consulting partnership with Clarum Advisors for energy-transition diligence and thesis development.

Name

ClearSky

Legal name

ClearSky Advisors LLC

Website

https://clear-sky.com

Company type

Private

Founded year

2012

Operating status

Operating

Headcount range

11–50 employees

Short description

ClearSky Advisors LLC is a venture capital and growth equity firm managing ~$1 billion across four funds focused exclusively on cybersecurity and energy transition companies, with 60+ portfolio investments and 41 realized exits since 2012.

Ownership category

akta.pro rank

Headquarters

HQ city

North Palm Beach

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Management Fees: VC/growth equity firms typically charge management fees on committed capital (approximately 1-2% annually) to cover fund operations and deal sourcing.
2. Carried Interest: VC firms typically earn carried interest (approximately 20% of profits) when portfolio companies achieve successful exits through acquisitions or IPOs.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

ClearSky is a venture capital and growth equity fund manager that invests capital from limited partners into innovative, growth-stage technology companies in the cybersecurity and energy transition sectors. The firm manages approximately $1 billion across multiple dedicated funds, providing portfolio companies with growth equity, strategic relationships, and operational expertise to accelerate revenue growth and product-market fit.

Product overview

ClearSky is a venture capital and growth equity fund manager that invests in innovative, transformative companies in the cybersecurity and energy transition sectors. The firm operates multiple investment funds including ClearSky Power & Technology Fund, ClearSky Security Fund, ClearSky Power & Technology Fund II, and ClearSky Fund IV. ClearSky does not develop or sell technology products or services itself; rather, it provides capital and strategic support to portfolio companies in its focus areas. The firm's investment strategy centers on transformative technology and platforms, leveraging deep sector expertise and industry relationships to identify opportunities in cybersecurity and sustainable energy markets.

Differentiator

Problem solved

Functional benefit

Brands

• ClearSky Power & Technology Fund: Investment fund focused on energy transition and power technology companies.
• ClearSky Security Fund
• ClearSky Power & Technology Fund II
• ClearSky Fund IV
• Clarum Advisors

Products and services

• ClearSky Power & Technology Fund

Quantifiable outcome

• Successfully managed approximately $1 billion in capital commitments over more than a decade
• +2 more outcomes

Named customers5 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Four partnerships are on record, tiered core.

• Clarum AdvisorscoreStrategic or Co-development Partner · 1 January 2026ClearSky partnered with Clarum Advisors, a strategic consulting group focused on accelerating the global energy transition. This collaboration enhances ClearSky's capabilities in thesis development, supports portfolio companies in refining strategies and operations, and offers unique insights to strategic investors. The Clarum team brings extensive experience in energy sector consulting and investing.
• Global Impact Investing Network (GIIN)coreStrategic or Co-development PartnerClearSky is a member of the Global Impact Investing Network, demonstrating commitment to impact investing principles.
• UN Principles for Responsible Investment (UN PRI)coreStrategic or Co-development PartnerClearSky is a signatory to the UN Principles for Responsible Investment.
• Venture Climate Alliance (VCA)coreStrategic or Co-development PartnerClearSky is a signatory to the Venture Climate Alliance.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Forgepoint Capital: Cybersecurity-focused venture capital firm investing across early and growth stages. Directly comparable to ClearSky's cybersecurity vertical with a similarly specialized, sector-insider investment approach.
• Energy Impact Partners: VC/PE firm focused on the energy transition, with strategic LP base of utilities and energy corporates. Closely comparable to ClearSky's energy transition fund family, both mobilizing LP capital toward decarbonization.
• Lytical Partners: Cybersecurity-focused venture firm investing in early and growth-stage enterprise security companies. Overlapping thesis, target stage, and LP base as ClearSky's Security fund.
• SYN Ventures: Cybersecurity-focused venture firm founded by former security operators. Closely comparable to ClearSky Security fund's operator-led, sector-specialist investment model.

Broad incumbents

• Insight Partners: Large-scale global VC and growth equity investor with significant cybersecurity exposure. Comparable to ClearSky at a much larger scale, investing across the same cybersecurity themes with bigger check sizes.
• Vista Equity Partners: Large PE firm specializing in enterprise software and cybersecurity buyouts. Overlapping sector focus with ClearSky's cybersecurity fund but at later stage and larger scale.
• Battery Ventures: Global technology-focused venture and growth firm investing across software, including cybersecurity and energy/industrial tech. Comparable dual-vertical technology investing style to ClearSky.
• Bessemer Venture Partners: Long-standing global venture firm with a strong cybersecurity portfolio and growing climate/energy practice. Overlapping sector exposure with ClearSky, though diversified across many other tech verticals.
• TPG Capital: Large alternative asset manager with dedicated climate/energy transition strategies and prior cybersecurity investments. Comparable to ClearSky at much larger AUM scale across overlapping themes.
• KKR: Global alternative asset manager with significant infrastructure/energy transition investing and growth equity arms. Adjacent to ClearSky's energy transition focus at much greater scale.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/clear-sky

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments94 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about ClearSky