The Tempsens Instruments (India) IPO opens today, Thursday, 20 August 2026, and stays open till Monday, 24 August. What has caught everyone's eye is the grey market premium, so let me start there before the dates.

GMP is running hot

As of today, the estimated listing price for Tempsens Instruments is ₹557. That is the ₹300 cap price plus the current GMP of ₹257. In percentage terms, the grey market is pointing to a gain of about 85.67% per share over the upper band.

To put that in rupees: at the upper band you pay ₹300 a share, one lot of 50 shares costs ₹15,000, and if the GMP holds till listing, that lot would be worth roughly ₹27,850. That is an indicated gain of around ₹12,850 per lot.

A word of caution, because 85% is a big number. GMP is an unofficial grey market signal, not a promise. It swings day to day and can cool off sharply by listing, especially on issues with a large offer for sale component like this one. Treat it as sentiment, not a guaranteed listing price. Track it right up to allotment day rather than locking onto today's figure.

Allotment and listing dates

Allotment is set for Tuesday, 25 August 2026. That is when the registrar finalises who gets shares and how many. Given the GMP buzz, expect this one to be heavily subscribed, so retail allotment could come down to the luck of the draw if it oversubscribes.

How to check your allotment status

KFintech is the registrar for this issue. You can check your status here: https://ipostatus.kfintech.com

Keep one of these handy: your application number, PAN, or DP client ID. PAN is usually the quickest. If the page is blank on the first try, wait a few hours, the data loads in stages through allotment day.

Key dates

  • IPO open: Thursday, 20 August 2026
  • IPO close: Monday, 24 August 2026
  • Allotment: Tuesday, 25 August 2026
  • Refund initiation: Thursday, 27 August 2026
  • Credit of shares to demat: Thursday, 27 August 2026
  • Listing on BSE and NSE: Friday, 28 August 2026

Issue details

  • Price band: ₹285 to ₹300 per share
  • Face value: ₹4 per share
  • Lot size: 50 shares, so one lot at the upper band works out to ₹15,000
  • Total issue size: 2,16,66,666 shares, up to ₹650 crore
  • Fresh issue: 31,66,666 shares (up to ₹95 crore)
  • Offer for sale: 1,85,00,000 shares (up to ₹555 crore)
  • Sale type: fresh capital cum OFS
  • Issue type: Bookbuilding IPO
  • Listing at: BSE and NSE
  • Market cap on upper price: ₹2,514.98 crore

Worth noting from the structure: most of this issue is an offer for sale (₹555 crore of the ₹650 crore total), with only ₹95 crore coming in as fresh capital. So the bulk of the money goes to selling shareholders rather than into the company, which is something to weigh against that strong GMP.

If you did not get an allotment

The amount blocked in your bank account gets released. For ASBA applications the mandate is revoked, so the funds that were on hold free up around 27 August. Nothing is debited for shares you were not allotted.

If you did get shares, they land in your demat account on 27 August, a day before listing. The stock lists on Friday, 28 August 2026, on both BSE and NSE.

One caution: allotment and refund dates are tentative, set by the company and registrar. They rarely move, but keep half an eye on exchange notices for any last-minute change.

Applied for this one, or waiting to see how the GMP holds? Post your view and your allotment result once it is out, it helps others read how tight the subscripttion was.