Person of the Day: Nithin Kamath, the Call-Centre Trader Who Built Zerodha

Most billionaires don't start their working life answering phones for a salary. Nithin Kamath did. Before he built Zerodha into one of India's largest stock brokerages, he spent his early twenties trading the markets by day and clocking shifts at a call centre to keep money coming in. That stretch of grinding, low-glamour work is the part of his story worth remembering, because it explains the patient, cost-obsessed company he eventually built.

Kamath, born on 5 October 1979 in Shivamogga, Karnataka, studied electronics and telecommunications at the Bangalore Institute of Technology. The engineering degree barely matters to his career; the markets did. He has spoken openly about being a restless student who found his real classroom in price charts rather than lecture halls.

A teenager hooked on the markets

Kamath started trading at 17, initially handling his father's account. The early thrill came with an early lesson. When the markets turned sharply in 2001-02, he lost a chunk of money and learned firsthand how quickly leverage and overconfidence can wipe out a beginner. It is a lesson that would later shape Zerodha's whole philosophy of caution and education.

Short on capital, he did the unglamorous thing. He took a job at a call centre, working as a telesales executive while continuing to trade on the side. For roughly three years he balanced a steady paycheque against the volatility of the market. That period taught him discipline and, crucially, kept him in the game long enough to get good at it.

From sub-broker to a business of his own

The next step was to turn trading from a personal pursuit into a service. Through Kamath Associates, he operated as a sub-broker and began offering portfolio advisory while running his own proprietary trades. He was, in effect, learning the brokerage business from the inside before deciding it needed reinventing.

What frustrated him was simple and structural. Indian brokers charged a percentage of every trade, which punished active traders and small investors alike. The more you traded, the more you bled in commissions. Kamath was convinced the model was overdue for disruption, and that technology could carry the load that armies of dealers and high fees once did.

Zerodha and the flat-fee revolution

In August 2010, Nithin and his younger brother Nikhil Kamath launched Zerodha. The name fuses the English "zero" with the Sanskrit "rodha," meaning barrier, and the idea was exactly that: remove the barriers to investing. Their pitch was radical for India at the time. Instead of charging a percentage, Zerodha charged a flat fee of around ₹20 per executed order and, on equity delivery, nothing at all.

The model is now standard, but in 2010 it was unheard of. By stripping costs to the bone and pushing everything onto clean, fast technology, Zerodha let everyday investors keep more of their own money. Word spread the cheapest way possible, through customers telling other customers, and the client base compounded year after year.

Two decisions made the company unusual even by startup standards:

• No outside money. Zerodha was built without venture capital, private equity or bank loans. It grew on its own profits, which gave the brothers full control and freedom to think long term rather than chase the next funding round.
• Profit from early on. While many Indian startups burned cash to buy growth, Zerodha was profitable, letting it invest in technology and people without pressure from investors.

Building tools, not just a brokerage

Kamath has always treated Zerodha as a technology company that happens to do broking. Its trading platform, Kite, launched in 2015, became known for being fast and clean at a time when many Indian trading apps were clunky. Around it grew an ecosystem of in-house tools for charting, mutual funds and analytics.

Just as important was the decision to teach rather than just sell. Varsity, launched in 2014, is a free, structured library of lessons on markets, trading and personal finance. In an industry that often profits from customers churning their portfolios, giving away patient education was an unusual bet, and it built deep trust with a generation of first-time investors.

Where Nithin Kamath stands today

The numbers now tell their own story. For FY24, Zerodha reported revenue of roughly ₹9,372 crore and profit in the region of ₹4,700 crore, figures that put a bootstrapped firm in the same conversation as far larger, funded rivals. Zerodha crossed into unicorn territory in 2020 purely on its own earnings, and it counts well over a crore of clients, making it one of the country's largest retail brokers — though rival Groww has since overtaken it on active-client count, even as Zerodha remains the biggest by revenue and profit.

Kamath's ambitions have widened beyond the trading screen. In 2015 he set up Rainmatter, a fund and incubator that backs fintech and, increasingly, climate and health startups, channelling capital and mentoring into young founders. He also co-founded True Beacon, an investment firm aimed at high-net-worth clients. Across these, the through-line is consistent: lower costs, more transparency, and aligning the firm's success with the customer's.

Why his journey resonates

Kamath's rise is striking precisely because it skipped the usual playbook. There was no elite pedigree, no marquee investors, no blitz of advertising. There was a teenager who lost money, a young man who took a call-centre job to stay solvent, and a builder who decided ordinary investors deserved a fairer deal.

For anyone watching India's startup scene, the lesson is bracing. A business can grow huge without surrendering control to financiers, and it can profit while genuinely lowering costs for its customers. Kamath remains closely involved in the company's product and culture, and his public writing tends to preach the same caution he learned at 22: markets reward patience, and most people lose money by trying to get rich in a hurry. That blend of commercial success and steady, honest counsel is what makes his career worth holding up as an example.