Investors / United States / Propeller
Propeller
Venture capital · Boston, MA, United States · North America
Propeller is an early stage venture investor that backs founders building companies in, on, around, or adjacent to the ocean. It invests out of a $118M Fund I and writes checks of roughly $500K to $3M, leading or following.
Invests inAI & Machine LearningIndustrial & ManufacturingClimate & Energy
In its own wordsoceanclimatecarbonindustrialsaquacultureblue economy
Your fit with Propeller
Four questions about your startup
See how your round matches what it backs, point by point.
Or find every investor that fitsPropeller lists 19 checked portfolio companies on its own site. Its largest themes are AI & Machine Learning (30%), Industrial & Manufacturing (27%) and Climate & Energy (18%). 67% of its companies are based in United States. It invests most often alongside Braid Theory, Congruent Ventures and Counteract.
No funding round on record names Propeller yet, so the figures come from its portfolio page.
Round figures show recent activity, not Propeller's whole history. Rounds on record name 0 companies; its own site lists 19. Funding rounds are complete from mid-2025, so counts and the yearly trend undercount a firm that invested before then. The portfolio, themes and places come from its own site and are not affected.
Investor profile
percentile among all firmsShow as a table
| Measure | Percentile of all firms | Value |
|---|---|---|
| Portfolio size | 49th | 19 companies |
| Recent activity | 46th | 0 rounds in 12 months |
| Early stage | 54th | 0% of entries at pre-seed or seed |
| Evidence | 52th | 0% of companies confirmed by a round |
| Sector focus | 53th | 30% in its largest sector |
| Reach | 78th | 5 countries |
Its portfolio companies
where they are based, and what their own sites showSite status
- Site answers19100%
- No longer answers00%
- Points to another company00%
- Parked or sold domain00%
A site that stops answering three checks in a row is counted as no longer answering; that is not proof of closure. A site that points to another company is often an acquisition.
Investment themes
share of its checked companiesThis firmAll checked companies
Show as a table
| This firm | All checked companies | |
|---|---|---|
| AI & Machine Learning | 30% | 18% |
| Industrial & Manufacturing | 27% | 7% |
| Climate & Energy | 18% | 1% |
| Education | 15% | 7% |
| Cybersecurity | 3% | 4% |
| Food & Agriculture | 3% | 3% |
| E-commerce & Marketplaces | 3% | 6% |
Co-investor network
who it backs companies with, and who they back togetherCompare Propeller head to head
portfolio size, rounds, entry stages, themes and the companies both backThree or more firms at once: portfolio overlap.
Portfolio
19 companies checked against their own sites| Company | What it does | Themes | First round with it | Evidence |
|---|---|---|---|---|
| Aikido Security provides various security products and services for developers to secure their applications and infrastructure. | CybersecurityAI & Machine Learning | Portfolio page | ||
| Allium designs and manufactures coated rebar technology for steel construction materials | Industrial & ManufacturingClimate & Energy | Portfolio page | ||
| Aquatic Labs provides an end-to-end solution for aquatic monitoring needs, from instrumenting projects with scalable tools to providing real-time data-driven insights | Industrial & ManufacturingAI & Machine Learning | Portfolio page | ||
| Blaze Energy develops technology to enable vessels to run on any alternative fuel, allowing for fuel flexibility in maritime shipping. | EducationIndustrial & Manufacturing | Portfolio page | ||
| Blue Energy designs and builds nuclear power plants using a factory-based approach to reduce costs and construction time. | EducationIndustrial & Manufacturing | Portfolio page | ||
| Calcarea decarbonizes shipping through scalable carbon capture and storage solutions | Climate & Energy | Portfolio page | ||
| CarbonRun helps restore the natural ability of rivers to carry carbon to the sea for long-term storage | Climate & Energy | Portfolio page | ||
| Circle Seafoods is increasing the value of wild fish through a more efficient, profitable, and equitable process. | Food & Agriculture | Portfolio page | ||
| Coastal Assembly protects and rebuilds shorelines naturally using engineered reef structures, creating marine habitat without disrupting the beach. | EducationAI & Machine Learning | Portfolio page | ||
| Ebb Carbon pioneers electrochemical water technology to transform industrial brine into freshwater, carbon removal, and industrial products. | Industrial & ManufacturingClimate & Energy | Portfolio page | ||
| Fleet Robotics provides hull cleaning and inspection services using autonomous robots for the shipping industry. | Industrial & ManufacturingAI & Machine Learning | Portfolio page | ||
| Indeximate provides continuous offshore intelligence and monitoring services for the offshore wind industry | E-commerce & MarketplacesIndustrial & Manufacturing | Portfolio page | ||
| Navier is shaping the future of maritime transport with active hydrofoils, electric and hybrid propulsion, and autonomous systems, delivering vessels that are faster, more efficient, and fundamentally different while scaling across passenger, cargo, and defense operations. | AI & Machine LearningAI & Machine Learning | Portfolio page | ||
| Nexxa.ai develops industrial autonomy software using AI and neural networks to solve operations problems for industrial companies. | Industrial & Manufacturing | Portfolio page | ||
| Orpheus Ocean designs, builds, and operates autonomous underwater vehicles for seafloor data collection and monitoring | Industrial & ManufacturingAI & Machine Learning | Portfolio page | ||
| The company accelerates natural processes to mitigate climate change by capturing CO₂ and storing it in the ocean | Climate & Energy | Portfolio page | ||
| Rewind delivers permanent, certified carbon removal by sealing sustainably sourced biomass in mine voids | Climate & EnergyAI & Machine Learning | Portfolio page | ||
| Vatn Systems designs and builds autonomous underwater systems and vehicles for defense applications | AI & Machine LearningAI & Machine Learning | Portfolio page | ||
| Vema Hydrogen is developing a production technology to produce clean and affordable hydrogen by accelerating naturally occurring chemical reactions in the subsurface | EducationEducation | Portfolio page |
About this data
site last read 5 Nov 2026- Site
- propellervc.com
- Last read
- 5 Nov 2026
- Watching since
- 5 Nov 2026
- Companies checked
- 19
Rates come from what VCinfo has observed since observation_start. Firms tend to remove companies that closed, so early rates understate reality. A company leaving a portfolio page does not mean it closed or exited. An unreachable site means our checks failed, nothing more.
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