Tempsens IPO surges to 21.66x subscription with 105% GMP as retail demand peaks

By the final day of bidding on August 24, Tempsens Instruments had become one of the year's most sought-after initial public offerings. The 650-crore rupee issue—a thermal engineering and specialized cable manufacturer going public—had drawn investors with an intensity that left little doubt about market appetite. The numbers told the story: by day two, the offering had been subscribed more than twenty-one times over, with nearly 1.51 crore shares on offer attracting bids from across every investor category.

Retail investors led the charge. Their reserved portion, comprising 75.65 lakh shares, had been claimed 18.67 times over—a sign that individual buyers saw something worth fighting for. Non-institutional investors, typically more aggressive, had pushed their segment to 52.98 times subscription. Even qualified institutional buyers, the most selective group, had oversubscribed their allocation by more than three times. The company had priced shares at a range of 285 to 300 rupees per lot of fifty shares, meaning a retail investor needed a minimum of 15,000 rupees to participate.

Tempsens itself is a 1990-founded manufacturer of temperature sensors, electrical heating systems, and specialized cables—unglamorous products that power industrial operations across more than eighty countries. In the year ending March 2026, the company controlled roughly 10.5 percent of India's temperature sensor market by revenue and had served more than one thousand unique customers. Its financial trajectory had been steady: total income grew nineteen percent year-on-year to 455.86 crore rupees in fiscal 2026, while profit after tax climbed fourteen percent to 71.07 crore rupees. The company had already raised 194.54 crore rupees from twenty-nine anchor investors at the upper price band before public bidding began.

What truly captured attention, however, was the grey market premium—the unofficial trading price that emerges before formal listing. By day three, that premium had reached 313 rupees, suggesting a potential listing price near 613 rupees per share, or roughly double the upper end of the offer band. A 105 percent premium is not routine. It signals that investors believe the company will command a significant jump when shares begin trading on the NSE and BSE, scheduled for August 28, subject to regulatory approval. Allotment was expected August 25.

Yet beneath the enthusiasm lay a valuation question. Anand Rathi, the brokerage that served as book-running lead manager, calculated that at the upper price band, Tempsens traded at a price-to-earnings multiple of 35.4 times and an enterprise value to EBITDA multiple of 25.64 times—metrics suggesting the company was already fully priced in. The brokerage acknowledged the company's strengths: robust revenue growth, a diversified product portfolio spanning industrial heating and temperature sensing, and an expanding international footprint across Asia Pacific, Africa, the Middle East, Europe, and the Americas. Yet it still rated the offering "Subscribe: Long Term," a recommendation aimed at investors willing to hold for years rather than trade on listing day gains.

The company planned to deploy the 73.13 crore rupees in net proceeds from the fresh issue toward capital expenditure in its heating and cable businesses, debt repayment of 55 crore rupees, and general corporate purposes. In effect, Tempsens was using the public markets not to fund explosive expansion but to strengthen its balance sheet and fund measured growth—the profile of a mature, profitable manufacturer rather than a high-growth startup.

The grey market premium, while eye-catching, carried an important caveat: it is an unofficial indicator, subject to fluctuation and no guarantee of actual listing price. Investors chasing the 105 percent premium were betting on sentiment that could shift between day three and August 28. For those with longer horizons, the question was whether a company growing revenue at nineteen percent annually, commanding a tenth of its domestic market, and exporting globally justified the valuation at which it was entering public markets. The answer, Anand Rathi suggested, depended on how long you were willing to wait.