Quartermaster Secures $140 Million Series B to Expand Ocean Surveillance Network

Arlington, Virginia-based maritime surveillance firm Quartermaster has closed a $140 million Series B funding round, signaling strong investor confidence in its ocean monitoring technology. The startup, which previously raised $43 million in a Series A earlier this year, attracted significant interest driven by geopolitical instability and the resulting disruptions in global shipping.

Founder and CEO Neil Sobin noted that recent global events, particularly the conflict involving Iran and the subsequent shipping chaos, have reinforced the market’s need for robust maritime awareness. “A big part of the story for us this year was, events in the world drive that clarity and drive that conviction and urgency, and when you see that, you gotta seize the opportunity,” Sobin said.

The investment round was led by software-focused venture firm Insight Partners, with contributions from new defense-oriented investor Overmatch Ventures and existing backers including First Round Capital. Additionally, $40 million of the total raise was structured as a debt facility from investment bank Stifel.

Nick Sinai, managing director at Insight Partners, highlighted the unique value proposition of the startup’s infrastructure. “Quartermaster is building a distributed network for the ocean, where reliable, real-time data has been difficult to come by,” Sinai said. He added that the team’s execution and the surging demand for maritime data made this a priority investment as the company scales to serve commercial fleets.

Central to Quartermaster’s offering is its “SmartMast” hardware, a weather-hardened system integrating cameras and radios mounted on ship masts. Unlike the standard Automatic Identification System (AIS), which primarily provides location pings, SmartMast captures comprehensive real-time data. This includes tens of gigabytes of daily recordings, enabling applications such as collision avoidance, congestion analysis, and the rescue of mariners in distress.

Sobin described the current state of maritime data as the “largest blind spot on Earth.” He emphasized that the industry has long been underserved by technological advancements, noting that when potential customers learn about SmartMast, they often bring a wealth of ideas for new use cases. “There isn’t a lot of prior art in maritime AI… there’s just so much low hanging fruit that we’ve been knocking down this summer,” he explained.

To date, Quartermaster has shipped more than 800 units, with over 650 vessels across 25 countries currently equipped with the system. The gap between shipments and active units reflects the startup’s transition toward deploying the technology for entire fleets rather than individual vessels. In response to growing demand, Quartermaster has doubled its manufacturing capacity and is refining its design to accelerate production speeds.

“We know we can do this, and we are seeing a lot of proof that tells us we’re really onto something massive and important in the world,” Sobin said. “So, what do you do when you have that position? You run faster and you move faster and you double down on that strategy.”