Picture the typical fintech growth playbook: billboard your face across the city, throw referral bonuses at anyone with a pulse, hand your sales team a quota that would make a Wall Street floor blush, and pray the churn doesn't catch up with you before the next funding round. Now picture the opposite of that. That's Zerodha.

On 1st July 2026, founder Nithin Kamath did the thing Kamath does best — quietly detonate a widely-held assumption about how businesses are supposed to grow. His point was simple, almost annoyingly so: Zerodha built a billion-dollar business without spending a rupee on advertising and without ever setting a sales target. No growth hacking. No funnel obsession. Just trust, compounded over years like the kind of interest everyone in his industry is technically supposed to care about.

Here's the actual substance, stripped of the theatrics: Kamath attributes Zerodha's scale not to acquisition tactics but to prioritising customer trust and long-term relationships over aggressive growth metrics. No ad spend. No sales targets pushing employees to upsell products customers don't need (the sin at the heart of half the finance industry's reputation problem). Instead, the model leaned on word-of-mouth, product quality, and a kind of patience that most venture-backed companies aren't allowed to have.

It's worth sitting with how unusual that is. Most founders treat "no marketing budget" as a constraint they're stuck with pre-Series A, not a strategy they'd choose at billion-dollar scale. Zerodha chose it. And kept choosing it.

Kamath's comments landed exactly where you'd expect — reigniting the debate about whether sustainable, trust-first growth can actually outperform the aggressive-acquisition model that dominates most industries. It's the tortoise-and-hare story, except the tortoise runs a brokerage and the hare just got fined for questionable customer acquisition practices (allegedly, and not specifically here — just, you know, generally, across the industry).

So here's the "so what," and it's a bigger deal than a single founder's LinkedIn-worthy soundbite. If you're a founder or SME owner, you've probably absorbed the industry-standard belief that growth requires spending — on ads, on incentivised sales teams, on whatever acquisition channel is trending this quarter. Zerodha's entire existence is a rebuttal to that belief, at a scale too large to dismiss as a fluke.

That doesn't mean the answer is "cancel your marketing budget tomorrow" (please don't email us about your Q3 numbers if you do). What it means is that trust compounds differently than acquisition spend does. Acquisition spend gets you a customer once. Trust gets you a customer who never leaves, tells their friends, and never once googles "is [your company] a scam" at 2am. One of those is a cost center. The other is, apparently, a billion-dollar business model.

For anyone running a company where sales targets currently dictate behaviour, Kamath's comments are worth a slightly uncomfortable gut-check: are your targets driving genuinely good outcomes for customers, or just good-looking numbers for the next board meeting?

Nithin Kamath basically built India's biggest brokerage by refusing to do the two things every business school tells you are non-negotiable — and it worked so well people are still arguing about it years into the company's existence. Maybe the real growth hack was never chasing growth hacks at all. Somewhere, a marketing agency is reading this and quietly closing the tab.

— The Business Index Team