Nexus AI: The Hong Kong Climate-Tech Startup Closing a $28M Series B You Need to Watch

In a corner office overlooking Victoria Harbour from Cyberport's Tower A, a team of thirty engineers has spent the last eighteen months training machine-learning models to predict urban flooding with 94% accuracy. The startup, Nexus AI, announced its Series B close yesterday at HK$217 million (roughly $28 million USD), led by Singapore's Vertex Growth and joined by returning backers including Alibaba Ventures and several family offices across Greater China.

The funding round matters because it signals something shift in Hong Kong's venture landscape: climate adaptation technology—particularly solutions addressing water stress—is moving from fringe concern to mainstream investment thesis. Nexus AI's platform ingests real-time sensor data from drainage systems, rainfall forecasts, and tide patterns, then recommends optimal pumping schedules and infrastructure interventions to municipalities and utilities. Its clients now include water authorities in Hong Kong, Singapore, and Manila.

Founded in 2021 by three former engineers from the Hong Kong Observatory and a data scientist who previously worked at ByteDance's sustainability lab, Nexus AI emerged quietly during the post-pandemic funding drought. The team bootstrapped early versions while operating from co-working spaces near Central MTR station. By 2024, they'd landed their Series A—HK$78 million from Sequoia China and local VC firm Cocoon Capital—and relocated to Cyberport's prestigious incubation programme, where subsidized office space runs roughly HK$6,000 per month compared to Central's HK$35,000-plus.

What distinguishes Nexus from dozens of other climate-tech hopefuls is granularity and speed. Unlike models that operate at city-wide scale, their system works at the district level, identifying hyperlocal vulnerabilities. For Hong Kong, where monsoon seasons increasingly trigger flash flooding in areas like Causeway Bay and Mong Kok, this matters urgently. The company claims its recommendations have helped reduce emergency drainage costs by 12-18% while improving response times by roughly forty minutes—critical during typhoon season.

The Series B capital fuels two bets: first, expansion into India and Southeast Asia's rapidly urbanizing centres, where climate-related water infrastructure spending is forecast to exceed $450 billion by 2030. Second, development of a satellite-integrated forecasting layer that doesn't rely on ground sensors—crucial for emerging markets with patchy data infrastructure.

Venture investors once nervous about "impact" returns have begun recognizing that climate-tech solving real operational problems generates genuine unit economics. Nexus AI's gross margins exceed 70%, and the firm is already operating cashflow-positive in Hong Kong. For a city increasingly concerned with resilience amid climate volatility, it's the kind of homegrown innovation worth tracking closely.

This article was compiled by AI from the sources linked above and screened before publishing. See our editorial standards.