ClearSky

ClearSky is a Boston-based cybersecurity-focused venture capital firm investing in growth-stage security technology companies, providing Series A and Series B capital to cybersecurity businesses that have demonstrated product-market fit and are scaling their commercial operations in enterprise markets. The firm was founded with a thesis that cybersecurity represents a structurally durable and large investment opportunity driven by the increasing severity of cyber threats, the growing complexity of enterprise technology environments, and regulatory pressures on organizations to demonstrate security maturity. ClearSky focuses specifically on enterprise security, providing sector expertise, customer introductions, and go-to-market guidance to help portfolio companies accelerate enterprise sales cycles. The firm invests with initial checks from $1 million to $5 million and backs companies across endpoint security, cloud security, identity and access management, security operations, and data protection. Portfolio companies include Code42, the insider risk management and data loss prevention platform; Exabeam, the AI-powered SIEM and threat detection platform; Material Security, the email and collaboration security platform; and Nuspire, the managed security services provider. Beyond its original investments, the portfolio includes additional enterprise cybersecurity companies.