Tempsens Instruments (India) Limited’s ₹650 crore mainboard IPO is drawing heavy grey market attention, with its Grey Market Premium (GMP) climbing steadily since the issue opened for subscription on August 20, 2026.
Data tracked by IPO-monitoring platforms such as Chittorgarh and InvestorGain shows the GMP has moved from around ₹85 earlier in the week to as high as ₹240 by the end of Day 1 — implying a premium of nearly 80% over the upper price band, with some trackers reporting readings closer to 73–91% depending on the timestamp captured.
IPO Details at a Glance
Tempsens Instruments, incorporated in 1990, is a thermal engineering and specialised cable manufacturer known for designing custom temperature-sensing instruments, industrial electrical heating solutions, and engineered cables used across power generation, steel, oil & gas, petrochemicals, aerospace, defence, and pharmaceutical industries. According to Chittorgarh, the IPO is a book-built issue comprising a fresh issue worth ₹95 crore and an offer-for-sale of ₹555 crore, aggregating to the full ₹650 crore issue size.
The price band has been fixed at ₹285 to ₹300 per share, with a lot size of 50 shares, translating to a minimum retail investment of roughly ₹15,000. The subscription window runs from August 20 to August 24, 2026, with allotment expected on August 25 and listing tentatively scheduled for August 28 on both BSE and NSE. ICICI Securities is the book-running lead manager, while Kfin Technologies is acting as registrar.
Strong Subscription Momentum
Early demand has been robust. Business Standard reported that the issue was subscribed roughly 2 times within 90 minutes of opening, while later Day 1 figures showed overall subscription climbing to 5.93 times — led by Non-Institutional Investors at 12.50 times, retail investors at 6.44 times, and QIBs trailing at 0.05 times as of the evening update.
What the GMP Trend Suggests
Grey market data compiled from platforms such as InvestorGain and IPO Watch shows the premium rising sharply through the pre-listing period — from roughly ₹65–85 mid-week to ₹220–240 by August 20 evening. At the upper price band of ₹300, a GMP in that range implies an indicative listing price between ₹520 and ₹540 per share, a potential gain of nearly 75–80% over the issue price if the trend holds.
It’s worth noting that GMP figures vary slightly across tracking platforms and change multiple times a day, so investors should treat any single percentage — including figures nearing 90%+ seen intermittently on some trackers — as a snapshot rather than a fixed number.
Day-Wise GMP Trend
Tempsens Instruments (India) IPO — GMP History
| Date | IPO GMP | Trend | Price Band | Est. Listing | Listing Gain |
|---|---|---|---|---|---|
| 21 Aug 2026 | ₹274 | ₹285-300 | ₹559 | 91.33% | |
| 20 Aug 2026 | ₹259 | ₹285–300 | ₹559 | 86.33% | |
| 19 Aug 2026 | ₹220 | ₹285–300 | ₹520 | 73.33% | |
| 19 Aug 2026 | ₹220 | ₹285–300 | ₹520 | 73.33% | |
| 18 Aug 2026 | ₹172 | ₹285–300 | ₹472 | 57.33% | |
| 17 Aug 2026 | ₹154 | ₹285–300 | ₹454 | 51.33% | |
| 16 Aug 2026 | ₹65 | ₹285–300 | ₹365 | 21.67% | |
| 15 Aug 2026 | ₹85 | ₹285–300 | ₹385 | 28.33% |
Issue size ₹650 Cr · Lot size 50 shares · Opens 20 Aug, closes 24 Aug 2026 · Listing on BSE & NSE tentatively 28 Aug 2026 · Allotment 25 Aug 2026 · Subscription (as of 21 Aug, InvestorGain): 5.95x overall. GMP is an unofficial, unregulated grey-market indicator and can change any time before listing — it is not a guarantee of listing performance.
Fundamentals Behind the Buzz
Analysts point to Tempsens’ leadership position — roughly 10.5% market share in India’s contact temperature sensor segment and 21.3% in non-contact sensors, where it is reportedly the only domestic manufacturer — as a key driver of investor interest, alongside a strong FY24–FY26 revenue, EBITDA, and profit CAGR. At the upper price band, the issue is valued at an FY26 P/E of around 37.3x, which some brokerages have flagged as a premium valuation.
Investment & Financial Disclaimer
This article is for informational and educational purposes only and does not constitute investment, financial, or trading advice. Grey Market Premium (GMP) is an unofficial, unregulated indicator sourced from informal grey market dealers — it is not published, endorsed, or verified by SEBI, NSE, or BSE, and it does not guarantee actual listing price or listing-day gains. GMP is highly volatile and can change or disappear entirely before listing. IPO investments are subject to market risk; past performance and grey market trends are not indicative of future results. Readers should conduct independent due diligence and consult a SEBI-registered financial advisor before making any investment decision.
Mayank Srivastava is a Indian Stock Market Expert with over 2+ years of experience in financial markets and investment analysis. He specializes in IPO evaluations, grey market premium tracking,various stock market strategies, derivatives strategies and data-driven investment research.
His analysis has helped thousands of retail investors make informed decisions in the Indian primary market. Mayank holds advanced certifications in financial Market and regularly contributes to leading financial publications. But he is not SEBI registered Finance Professional. He writes only for educational purpose not giving any investment advice. Please Consult SEBI Registered Finance Consultant or Professional before any investment in stock market. He is not responsible any investment loss after reading this website content
