Quartermaster Raises $140M to Map the Ocean's Blind Spots

Maritime intelligence startup Quartermaster has closed a $140 million Series B, a major jump from the$43 million Series A it secured just months earlier. Based in Arlington, Virginia, the company builds weather-hardened sensor packages that capture and relay real-time data about what’s happening at sea. Software-focused investor Insight Partners led the round, joined by defense-oriented newcomer Overmatch Ventures and returning backer First Round Capital; about $40 million of the total came as a debt facility from Stifel.

The company’s hardware, called SmartMast, mounts cameras and radios on a ship’s mast and streams continuous maritime data. That is a step beyond the automatic identification system (AIS), which largely amounts to location pings and leaves enormous gaps. Quartermaster frames the ocean as the planet’s biggest blind spot, and its real-time feeds open the door to collision avoidance, clearer visibility into congested shipping lanes, and even search-and-rescue for mariners in trouble.

Founder and CEO Neil Sobin said the round was preempted by Insight Partners, and that global events, including the war in Iran and the shipping disruption it triggered, sharpened conviction around the company’s core thesis. He noted SmartMast units log tens of gigabytes daily, with customers still discovering new applications for the data. According to Sobin, more than 650 vessels across 25 countries now carry SmartMast, while over 800 units have shipped to customers, a gap that reflects the company’s move toward outfitting entire fleets. Quartermaster has doubled manufacturing capacity and keeps refining its design to speed up production.