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Maritime intelligence startup Quartermaster raises $140M Series B led by Insight Partners to expand real-time ocean data network with SmartMast sensors.

PRIVATESep 29, 2026

Amount Raised

$140 Million

Round Type

Series B

VirginiaPublic Safety

Investors

Operator PartnersBoxGroupTMV LogisticsSteel AtlasQuiet CapitalFirst Round CapitalOvermatch VenturesStifelInsight Partners

Description

Quartermaster, an Arlington, Virginia-based maritime intelligence startup, raised $140 million in a Series B funding round led by Insight Partners, comprising $100 million in equity and $40 million in venture debt from Stifel. The company operates SmartMast, a weather-hardened system combining cameras and radios mounted on vessel masts, currently deployed on more than 650 vessels across 25 countries with over 800 units shipped. New investor Overmatch Ventures joined returning investors including First Round Capital, Quiet Capital, Steel Atlas, TMV Logistics, BoxGroup, and Operator Partners. The funding will support expansion of Quartermaster's real-time maritime data network, which has already achieved coverage of nearly 46 million square kilometers.

Company Information

Company

Quartermaster

Location

Virginia, United States

About

Quartermaster is an Arlington, Virginia-based startup that is developing a maritime sensing solution called SmartMast. This technology consists of advanced sensors that provide real-time maritime data, creating a distributed sensing network designed to improve safety and efficiency in maritime operations. The company aims to address the vulnerabilities of existing maritime identification systems while facilitating various applications in marine autonomy and data collection.

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Funding Insights

What this usually means
Timeline to next round
Series B companies typically work for 15-20 months before raising new capital
Growth expectations
Series B companies are expected to scale rapidly and expand market reach

Quartermaster raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.