Quartermaster, an Arlington, Virginia company that fits commercial ships with sensors to build an ocean data network, said on 28 September 2026 that it had raised $140m. The total was made up of a $100m Series B led by Insight Partners and a $40m venture debt facility from the investment bank Stifel.
Overmatch Ventures, a defence-focused investor, joined as a new backer. First Round Capital and Quiet Capital, which co-led the company's Series A in May, returned, along with Steel Atlas, TMV and other existing investors. In its announcement the company also thanked BoxGroup and Operator Partners for staying with it.
Quartermaster did not disclose a valuation. TechCrunch described the round as preempted by Insight Partners.
“We hadn't planned to raise again this year, but the shipping and maritime industry is changing fast in 2026.”Neil Sobin, CEO, Quartermaster
What Quartermaster does
The company's main product is SmartMast, a weather-hardened package of cameras and radios mounted on a ship's mast. According to TechCrunch, each unit records tens of gigabytes of data a day, which Quartermaster relays as a live picture of activity at sea. The company contrasts this with AIS, the system in which ships broadcast their own position, and with satellite imagery taken from orbit.
Quartermaster said SmartMast was installed on more than 650 vessels in 25 countries, mostly operated by small owners. Operators pay nothing beyond giving up space on the mast. In return they get the hardware, installation and support, access to their own sensor feeds, hazard alerts along their route and broadband internet at sea. The data collected is aimed at insurers, fleets and energy operators.
TechCrunch reported that the company had shipped more than 800 units, had doubled its manufacturing capacity and was revising the design to speed up production. Its next step is to fit whole fleets rather than single vessels.
Why it raised early
Chief executive Neil Sobin wrote that the company had not planned to raise again this year. He linked the decision to disruption in shipping during 2026, including widespread jamming and spoofing of navigation signals in the Gulf in February and the long closure of the Strait of Hormuz.
In the company's post, Sobin argued that the closure was driven in part by insurers being unable to price risk without a clear picture of what was happening on the water. TechCrunch reported that he credited the war in Iran and the resulting disruption with raising interest in the company.
What the money is for
Quartermaster said it would use the new financing to hire more engineers and to recruit more vessels to its network, with the aim of increasing coverage across the busiest fishing grounds and commercial shipping lanes.
The company did not report revenue, customer names or its headcount. TechCrunch said governments, shipping companies and insurers could use the data, for tasks such as collision avoidance, tracking congestion in shipping lanes and finding mariners in distress.
The funding so far
Quartermaster announced a $43m Series A on 20 May 2026, co-led by First Round Capital and Quiet Capital, with TMV Logistics, Steel Atlas, BoxGroup, Operator Partners, Shorewind Capital and David Adelman also investing. The two announced rounds add up to $143m in equity, but the company has not stated a total for all the money it has raised.
Company website: quartermaster.us