Bengaluru-based Tonbo Imaging India made a stellar stock market debut on Friday, listing at Rs 1,162 on the BSE. That is a 66% premium over its Rs 700 issue price. On the NSE, the stock opened at Rs 1,160, a 65.71% gain.
The debut capped a Rs 852.18-crore initial public offering that was subscribed nearly 136 times. Bids came in for about 115.87 crore shares against 85.26 lakh shares on offer, with qualified institutional buyers leading demand at nearly 294 times.
The offer details
The IPO was a pure offer for sale of around 1.22 crore shares by existing shareholders. That means the company itself receives none of the proceeds. The price band had been fixed at Rs 665 to Rs 700 per share.
Shares closed their first session at Rs 1,133.65 on the BSE, still nearly 62% above the issue price. At that level, the defence electronics maker’s market capitalisation stood at about Rs 6,494 crore.
What Tonbo Imaging builds
Tonbo Imaging designs and makes sensing, processing, communication and guidance systems for surveillance, reconnaissance, targeting and control. Its portfolio spans thermal imaging cores, weapon sights, handheld thermal binoculars, targeting systems, missile seekers and missile guidance systems.
Incorporated in 2003 and headquartered in Bengaluru, the company says it has deployed more than 28,000 systems across 24 countries. Its founder and chief executive is Arvind Lakshmikumar.
The founder on building defence tech in India
Ahead of the public issue, Lakshmikumar explained what sets the company apart.
“Thermal imaging has been around for 30-40 years. But it has always been heavy, expensive and consumed a lot of power, which limited the applications in which it could be used. What we have been able to do is build components that allow us to reduce the size, weight and power usage of thermal imagers.”
He has said the company holds about 65% of India’s thermal weapon sights market, having supplied roughly 20,000 of the 30,000 thermal sights deployed in the country.
A Frost and Sullivan report cited in the IPO papers credits Tonbo with 51% of thermal imaging units supplied to the Indian government between April 2024 and March 2026.
Growth bets and the risks
Tonbo expects its next phase of growth to come from thermal weapon sights, missile seekers and high-power microwave systems. It is the sole-source supplier to Bharat Dynamics for an uncooled missile seeker, and is developing WaveStrike, a high-power microwave weapon designed to disable drone swarms.
The company has spoken of a potential Rs 2,500-crore opportunity around counter-drone systems. That figure reflects letters of intent from the Indian Navy and European customers, not secured revenue, so execution remains the test.
Our take
Tonbo listed on the same day as Zetwerk, which opened at a more modest 5.46% premium on the NSE. The contrast says plenty. Tonbo’s debut is a bet on defence indigenisation, backed by a Frost and Sullivan finding that Tonbo accounts for 94% of India’s thermal imaging exports by volume.
The risks deserve equal weight. Tonbo reported a net loss of Rs 17.7 crore in the quarter ended June 2026, and the entire IPO was an offer for sale, so no fresh capital reached the company. Its next growth drivers are still in development.
A blockbuster debut does not guarantee a steady run. If Tonbo converts its missile seeker pipeline and counter-drone letters of intent into delivered orders, this listing will look like the start of something bigger. If it cannot, the market will notice quickly.
