Ostra Security, a prominent managed security provider, has announced an extension of its Series A funding round, bringing the total raised to $9.5 million. The round was co-led by General Catalyst and Rally Ventures, with continued support from long-term investment partner Jeff Cowan at CapitalFour.
Additionally, Ostra has bolstered its scale and expertise through the acquisition of Blackwell Security, a cybersecurity firm recognized for its advanced managed detection and response (MDR) platform and industry-leading proficiency. The integration of Blackwell’s managed XDR platform, Pulse, with Ostra’s premier managed security services will offer comprehensive protection to support organizations across all growth stages.
The combined efforts of Ostra and Blackwell aim to address key market challenges: organizations frequently grapple with security complexity, limited internal resources, and heightened stakeholder expectations. This unified approach delivers an outcome-oriented solution that empowers businesses to enhance their security posture while maintaining focus on strategic growth.
The increased funding highlights robust investor confidence in Ostra’s vision and capacity to achieve measurable success in a marketplace historically challenged by inefficiencies and underperformance.
How the funding will be used: This infusion of capital will facilitate accelerated hiring, enhance technical capabilities, and further develop Ostra’s bespoke service model, which is designed to help businesses strengthen security without increasing internal workloads.
KEY QUOTES:
“Bringing Blackwell’s leading MDR platform together with our high-touch model means our customers will navigate risk with unprecedented clarity and control. It’s a major step toward delivering the next generation of outcome-driven managed security.”
Andrew Tewksbury, CEO of Ostra Security
“We’re not just closing today’s security gaps. We’re building the future of how growing companies protect themselves. Bringing Blackwell’s leading MDR platform together with our high-touch model means our customers will navigate risk with unprecedented clarity and control. It’s a major step toward delivering the next generation of outcome-driven managed security.”
Andrew Tewksbury, CEO of Ostra Security
“Cybersecurity is moving beyond buying tools and hoping they work. Ostra’s approach delivers real, measurable outcomes that give IT leaders and boards confidence in their security posture. The addition of Blackwell strengthens an already impressive platform and team, and we’re proud to back a company so deeply committed to delivering results for its customers.”
Mark Crane, Partner at General Catalyst
