Saildrone is launching its eighth straight fleet of uncrewed sailing drones to study a developing El Niño with NOAA. Behind the science mission is a company that took a 2024 down round and now leans on Navy contracts, a Danish state fund, and a $50M Lockheed Martin investment.

Saildrone, the Alameda company that builds wind- and solar-powered ocean drones inside a former Naval Air Station hangar, is launching its eighth consecutive fleet toward the equatorial Pacific to measure a developing El Niño — and this year the weather backdrop is real. NOAA's Climate Prediction Center issued an El Niño Advisory on June 11 (external source, opens in a new tab), and its forecasters now put the odds of a very strong event this fall and winter above 90%, with a meaningful chance of a "Super" El Niño rivaling the strongest on record.

The 23-foot vehicles, carrying 15 sensors and piloted remotely, will cover more than 3,000 miles before wrapping in December, according to a KTVU report by Mark Tamayo. Saildrone plans each route with scientists from NOAA's Pacific Marine Environmental Laboratory, whose oceanographers told the station the drones are a valuable way to watch an event like this El Niño unfold in real time. That is the friendly, publishable face of the company.

The cap table tells a harder story. Saildrone raised a $100M Series C in 2021 led by BOND at a roughly $600M valuation. Its next raise — a reported $75M in 2024 — came in lower, at about $575M post-money, per Sacra (external source, opens in a new tab): a down round for a hardware company that had been a venture darling. The money since has shifted decisively toward national security. A reported $60M round in 2025 was led by Denmark's state Export and Investment Fund, alongside Lux Capital and defense-adjacent backers; Lockheed Martin then made a $50M strategic investment in October to mount weapons — including a missile launcher — on Saildrone's Surveyor hulls.

Read the company's own homepage (external source, opens in a new tab) and the science recedes: it now leads with a Navy cocaine seizure, anti-submarine warfare, and patrolling the GIUK Gap. Total funding tops $345M.

None of that makes the El Niño data less useful. But EDGAR's full-text search surfaces only investor-side vehicles for Saildrone — an SPV and a tax blocker — not the operating company's own round filings, so the valuation figures remain reported, not filed. What to watch: whether the next disclosed raise, if it comes, is priced above 2021's mark, and whether "ocean science company" still describes what Saildrone sells.