Rainmatter: Zerodha's Patient Capital for Fintech, Climate and Health

Rainmatter is the investment arm of Zerodha, founded by brothers Nithin Kamath and Nikhil Kamath. It started in 2016 as a small initiative to support companies expanding India's capital-markets ecosystem — and nine years later, Nithin Kamath revealed it has invested over ₹1,500 crore (about $180 million) across more than 160 Indian startups. It is, by design, nothing like a typical venture fund.

Thesis and sectors. Rainmatter's own line: "We back Indian founders working on helping Indians make better choices with their money and health. At the end of the day, what's wealth without health?" It invests across fintech, climate, health & fitness and media — with the largest concentration in climate tech (44 companies), followed by health and fitness (41) and fintech (37). Its newer focus is backing startups that help India build and own more of what it consumes, moving beyond pure capital-markets plays. Climate is a conviction bet: the firm has committed $200 million in funding and grants through the Rainmatter Foundation to individuals and organisations working on climate action.

Fund size and cheque size. Rainmatter runs a ₹1,000 crore alternative investment fund (AIF) with an unusually long 15-year duration (extendable by two more), plus capital from the Zerodha balance sheet — total assets are roughly ₹1,600 crore. It writes cheques from ₹50 lakh to ₹100 crore with no stage fixation, no board seats and no pressure for quick exits. Kamath's philosophy is explicit: "We're not a typical VC. We don't take board seats, and we're not in this for quick exits… our approach has been simple: be patient, back founders for the long term." To date it has not fully exited a single investment, with only a partial secondary exit in CRED. Zerodha allocates 10% of its earnings to startup investments and another 10% to social development through Rainmatter.

Notable portfolio. Across its 145-company live portfolio: fintech names like Jupiter, smallcase, Finshots, The Ken and The Arc; health bets like The Whole Truth, Praan Health, Upliance.AI, PeeSafe and Sisters in Sweat; and climate/hardware companies like deep-tech startup AquaAirX (whose ₹12.5 crore seed round Rainmatter led), Akshayakalpa Organic and Amwoodo.

Partners. Dinesh Pai heads Rainmatter's equity investments; the team runs lean — around three to four full-time executives — with Zerodha's leadership (including legal/professionals Somnath Mukherjee and Viraj Joshi) pitching in informally. There is deliberately no rigid investment structure or fixed thesis.

Programs, credits and perks. Beyond capital, Rainmatter offers portfolio founders funding, mentorship, access to Zerodha's financial APIs, industry networks and opportunities to validate products. Its financial-literacy platform Varsity — a free education resource used by millions — is the cultural anchor of the ecosystem it is building. The Rainmatter Foundation is its grant-making arm for climate and environment.

How founders can approach them. Kamath says he gets a lot of inbound — the firm's site simply asks, "Think your idea fits? Let's talk" (rainmatter.com). Rainmatter doesn't stick to stage-based investing; it thinks of businesses holistically and decides after hearing what you're building. Climate, health and fintech founders solving genuinely overlooked problems get priority attention.