A rendering of a HawkEye 360 cluster of RF satellites. Photo: HawkEye 360

HawkEye 360 has raised a further $23 million to its Series E funding round, with participation from new investors Ghisallo, Principia Growth, and Sixty Degree Capital. Existing investor Strategic Development Fund also participated in the round.

This comes after HawkEye 360 raised a mix of debt and equity financing valued at $150 million to support the acquisition of Innovative Signals Analysis (ISA) in December of 2025. The company said it will use this new capital to strengthen its balance sheet and continue the integration of Innovative Signal Analysis (ISA).

“This additional close reflects our disciplined approach to capital formation,” commented Craig Searle, CFO of HawkEye 360. “It strengthens our balance sheet and provides flexibility as we continue integrating ISA, advancing our platform, and managing growth in a thoughtful and deliberate way.”

HawkEye 360 provides radio frequency detection and monitoring with data acquired from its satellite constellation. Earlier this year, the company commissioned three new satellites into the constellation.