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Fleetzero

Electric cargo ships with autonomous operation

Overview

Fleetzero builds a fleet of electric cargo ships powered by a proprietary Marine Battery System to move goods in a cleaner way. They focus on smaller vessels built in domestic shipyards and designed to operate in regulated markets, enabling access to ports larger ships miss. The ships can operate autonomously, reducing crew and maintenance costs while allowing rapid battery upgrades as tech improves. The goal is to provide affordable, low-emission shipping without a green premium, transforming logistics toward sustainable, closer-to-market delivery.

YC CompanySignificant Headcount Growth

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About Fleetzero

Simplify's Rating
Why Fleetzero is rated
B-
Rated B on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Robotics & AutomationAutomotive & TransportationIndustrial & ManufacturingEnergy

Company Size

11-50

Company Stage

Series A

Total Funding

$59.6M

Headquarters

Houston, Texas

Founded

2021

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Simplify's Take

What believers are saying

  • January 2026's $43 million round brought Obvious, Maersk Growth, and Breakthrough Energy.
  • June 2026 autonomy launch adds OctoPod and OctoBox retrofit revenue from existing fleets.
  • Defense and commercial demos position Fleetzero for MARAD, Coast Guard, and contested-logistics contracts.

What critics are saying

  • Leviathan's first commercial deployment stays later in 2026, leaving revenue unproven.
  • Battery fires or autonomy failures can freeze orders and trigger costly recalls.
  • Without shipping customers, Thoma-Sea and defense work cannot save Fleetzero; failure becomes terminal.

What makes Fleetzero unique

  • Fleetzero combines Leviathan batteries, propulsion, and OctoDrive autonomy in one stack.
  • June 2026 Thoma-Sea and Glosten partnership targets Jones Act-compliant autonomous vessels.
  • January 2026 Houston facility gives 300 MWh annual capacity and retrofit manufacturing.

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Funding

Total Funding

$59.6M

Above

Industry Average

Funded Over

3 Rounds

Notable Investors:
Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Above Average

Industry standards

$15M
$8.2M
$15M
$30M
$43M

Benefits

  • Company Equity

Growth & Insights and Company News

Headcount

6 month growth

2%

1 year growth

14%

2 year growth

0%
PR Newswire
Jun 16th, 2026
Fleetzero launches marine autonomy stack for commercial and defence vessel operations

Fleetzero, a Houston-based marine technology company, has launched its autonomy stack for commercial and defence vessel operators. The system comprises OctoDrive autonomy software, OctoPod tele-operated command centre, and OctoBox mobile autonomy package for retrofitting existing vessels. The launch expands Fleetzero's portfolio beyond its battery and power systems into the autonomous vessel market. Built by US Navy veterans, OctoDrive features multi-sensor fusion, autonomous route planning and low-latency performance. The system enables operators to control vessels remotely from shore-based locations. OctoBox, roughly suitcase-sized, allows ship owners to add autonomous capability to existing fleets without complete overhauls. Fleetzero has demonstrated the technology to commercial and defence customers, with multiple vessels currently operational.

Navy Today
Jun 4th, 2026
US trio to develop next-generation autonomous vessels.

US trio to develop next-generation autonomous vessels. June 4, 2026, by Fatima Bahtić US marine technology developer Fleetzero has partnered with shipbuilder Thoma-Sea Marine Constructors and naval architecture and engineering firm Glosten to support the development and deployment of autonomous vessel solutions for commercial maritime, government and defense applications. The collaboration will combine Fleetzero's battery energy storage, propulsion and autonomy technologies with Thoma-Sea's shipbuilding capabilities and Glosten's vessel design and engineering expertise. As part of the effort, the companies are developing an autonomous diesel-electric vessel intended for operations in contested environments, long-endurance missions and supply delivery tasks. According to the firms, the vessel features a low-profile design aimed at reducing radar detectability and supporting long-range operations. The collaboration is intended to support US government priorities, the Department of War, MARAD, and Coast Guard, which are related to modular and open-system vessel architectures. The platform is being developed for a range of applications, including autonomous and remotely operated cargo transport, intelligence, surveillance and reconnaissance (ISR) missions, patrol operations and contested logistics. The companies also see potential applications in electrified harbor craft, tugboats and coastal vessels. They added that the platform is designed to improve operator safety and support compliance with domestic-content requirements, including the Jones Act and Buy American provisions. "Moving cargo through contested waters is more imperative today than ever before. Fleetzero is building and demonstrating that capability today," said Steven Henderson, CEO of Fleetzero. "By partnering with Thoma-Sea and Glosten, we are pairing our Leviathan Energy Storage Systems and Fleetzero's autonomy stack with two of the most capable shipbuilding and design organizations in the country. This is how we can deliver MOSA-compliant, autonomous vessels at scale." "Bringing autonomy and electrification together at the vessel-design level is where this collaboration creates real value," said Morgan Fanberg, CEO of Glosten. "Working with Fleetzero and Thoma-Sea, we are designing vessels that are autonomy-native from the keel up, not retrofitted as an afterthought. The design is both functional and low-signature, built for decades of deliveries in the years ahead." "Our yards have been building ships for American operators for decades," said Walter Thomassie, Managing Director of Thoma-Sea. "Partnering with Fleetzero and Glosten allows us to deliver the next generation of autonomous vessels with stealth capabilities ready for the missions our customers face today." Thoma-Sea was selected by the US Navy's Naval Sea Systems Command to design and build the NOAA Oceanographer-class research vessels under a $178 million contract, and has delivered navy-administered Foreign Military Sales vessels for allied customers. Put your brand on the radar and boost visibility. From banner ads to sponsored content, Navaltoday help your solutions cut through the noise. Trust Naval Today to align the compass and navigate your message!

PR Newswire
Jan 16th, 2026
Fleetzero raises $43M to scale hybrid and electric ship propulsion systems

Fleetzero, a marine technology company building hybrid and electric propulsion systems for ships, has raised $43 million in Series A funding led by Obvious Ventures. Maersk Growth and 8090 Industries joined as new investors, alongside existing backers including Breakthrough Energy Ventures and Y Combinator. The Houston-based startup will use the capital to expand manufacturing of its Leviathan propulsion system, which can be retrofitted onto existing vessels or installed in new ships. The company has opened a new manufacturing and R&D facility with initial capacity of 300 MWh per year, planning to scale to three GWh annually over five years. Fleetzero's system aims to reduce total ownership costs through maintenance and fuel savings whilst enabling marine autonomy. The company positions electrification as an opportunity to revitalise US shipbuilding.

Marine Log
Aug 15th, 2025
Fleetzero, Glosten to build world's longest-range hybrid electric vessel

Fleetzero, a developer and manufacturer of modular propulsion platforms for hybrid and electric ships, has selected Glosten, a Seattle-based naval architecture and marine engineering firm, to design what is expected to be the world's longest-range hybrid electric vessel.

My Climate Journey
Apr 2nd, 2024
Our Investment in Fleetzero

Cost-effectively decarbonizing the shipping industry

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