About Bluesonde
Bluesonde makes compact buoys that monitor water quality continuously. Each unit is 12 inches in diameter and runs on solar panels and a long-life battery. It sends data over cellular, satellite or Bluetooth links. Sensors cover location, temperature, conductivity, dissolved oxygen, turbidity, pH, chlorophyll and more. Customers read the data in the Bluesonde Dashboard or pull it into their own systems through an API. The company serves port and infrastructure operators, water managers, aquaculture farms and researchers.
Bluesonde is based at the Roux Institute in Portland, Maine. It built its systems there as part of the ClimateTech Incubator. More than 40 systems were deployed in 2026 across Maine and several other states, mostly for shellfish aquaculture and research. Andrew Thompson is chief executive officer and co-founder. John Williams is chief operating officer, Tim Dyson is chief technology officer, and Ben Mallett is founding software engineer. The team honed its skills at Running Tide, building ocean monitoring systems. In September 2026 Bluesonde announced $1.74 million in new funding.
Funding Rounds (SEC Form D)
| First sale | Filed with SEC | Amount sold | Investors | Avg. check | Terms | Filing |
|---|---|---|---|---|---|---|
| Nov 11, 2025 | Oct 29, 2026 | $1,000,000fully sold | 10 | $100K | OptionsRule 506(b) | Form D ↗ |
First sale is the date the first investor in the offering committed to invest. Companies must file Form D within 15 days of that date, so filing dates run later.
Rounds announced by Bluesonde
What the company said publicly about its funding. Announced amounts can differ from Form D figures: an announcement can combine several closings, and some money is raised without a Form D.
| Announced | Round | Amount | Investors | Source |
|---|---|---|---|---|
| Sep 29, 2026 | Pre-seed | $1.3 million | Corsair Venture Partners (lead), Anthrofix and other investors | Bluesonde Secures $1.74M to Scale Real-Time Water Monitoring ↗ |
Why Investors Backed Bluesonde
Bluesonde sells small buoys that measure water quality continuously and send the readings to a cloud platform. It announced $1.74 million in new funding in September 2026. That included a $1.3 million pre-seed round led by Corsair Venture Partners. The founders bring hardware experience from space, energy and medical devices.
The problem it targets
In Bluesonde's view, manual sampling gives only a snapshot of conditions that can change fast. Continuous monitoring gives a fuller picture, but conventional systems can be expensive, hard to deploy and maintenance-heavy. Biofouling adds to the load. It can degrade sensor performance and add a large maintenance burden for equipment left in the water.
What the product does
The buoys are built to deploy quickly, run with minimal maintenance and stream data to the cloud continuously. A web platform shows conditions in real time and builds a historical record that can reveal changes sampling may miss. A patent-pending ultraviolet antifouling system draws little power. It is meant to extend deployment periods and cut the need for frequent servicing. LakeTech's president said a unit can go out on a kayak and be set by hand.
Progress so far
A growing number of the 2026 deployments serve environmental monitoring, water utilities and beach safety. In September 2026, a couple dozen buoys along the Maine coast were tracking local conditions during a harmful algal bloom. The harbormaster of the Town of Harpswell said the buoys captured the bloom's onset and are now a permanent part of coastal management there. Bluesonde also ran a proof of concept at Newtown Creek with the New York City Department of Environmental Protection. It has a deployment with Cleveland Water Alliance on Lake Erie. Aquatic Sensors is its distributor.
Who backs it
Corsair Venture Partners led the $1.3 million pre-seed round, with Anthrofix and other investors taking part. Maine Technology Institute lent $250,000 for manufacturing scale-up and commercialization. A $190,000 NOAA Small Business Innovation Research Phase I award will fund more work on the antifouling technology. The funds will also pay for more production, technology work and data software. Chris Wolfel, Corsair's founder and managing partner, said the team grew from an early idea into a company with paying customers and field deployments. Damian Brady, interim director of the University of Maine's School of Marine Sciences, advises Bluesonde.
We wrote this summary from public statements by Bluesonde and its investors. It is not investment advice.
Bluesonde in the News
Leadership Team
Executive officers and directors listed on Bluesonde's Form D filed Oct 29, 2026.
