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All four IPO calendars currently show an offer window of 15–19 October 2026 and an expected listing date of 23 October. India IPO’s calendar lists GMP snapshots from ₹22 for Zetwerk to ₹390 for Tonbo, but a separate tracker search result put Tonbo at ₹285. GMP is an unofficial grey-market signal—not an exchange price, a confirmed listing price or a promised gain.
Dates and key IPO details
India IPO’s calendar, accessed on 13 October 2026, lists all four as mainboard IPOs with BSE and NSE as the exchanges. Its terms and GMP figures are secondary-source snapshots, not definitive offer documentation.
| Issuer | Offer window | Expected listing | Reported price band | Issue size | Minimum lot | Calendar GMP snapshot |
|---|---|---|---|---|---|---|
| Bonfiglioli Transmissions Ltd. | 15–19 October 2026 | 23 October 2026 | ₹558–584 | ₹2,534 crore | 25 shares | ₹175 |
| Tonbo Imaging India Ltd. | 15–19 October 2026 | 23 October 2026 | ₹665–700 | ₹852 crore | 21 shares | ₹390 |
| Sahajanand Medical Technologies Ltd. | 15–19 October 2026 | 23 October 2026 | ₹327–344 | ₹475 crore | 43 shares | ₹40 |
| Zetwerk Manufacturing Business Ltd. | 15–19 October 2026 | 23 October 2026 | ₹143–151 | ₹5,012 crore | 99 shares | ₹22 |
Source for the calendar terms and GMP snapshots: India IPO calendar, accessed 13 October 2026. The calendar labels BSE and NSE as the exchanges for these mainboard offers.
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SEBI’s public-issues listing shows a Tonbo Imaging India Limited RHP entry dated 12 October 2026 and a Sahajanand Medical Technologies Limited RHP entry dated 10 October 2026. These are the filing entries captured on the regulator’s page; the cited evidence does not establish RHP dates for Bonfiglioli or Zetwerk.
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Check the latest offer documents and company or exchange notices before relying on calendar dates or terms. For Bonfiglioli in particular, the secondary listings captured here do not agree on the upper price-band figure: India IPO shows ₹584, while Prudent shows ₹586. Prudent gives an issue-size range of ₹2,412.74–2,533.81 crore, compared with India IPO’s rounded ₹2,534 crore. Confirm Bonfiglioli’s final RHP or price-band notice for settled terms.
Sources: SEBI public-issues listing; Prudent forthcoming issues.
How to read the GMP figures
GMP means grey-market premium. It is a reported premium or discount in unofficial trading outside the exchange, so it can change and should not be treated as an official IPO price or an assured return. India IPO’s tracker distinguishes GMP from its estimated price, calculated as issue price plus GMP, and from actual listing and listing-day closing prices.
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The calendar’s ₹390 Tonbo snapshot is the highest of the four values shown in the 13 October calendar capture, but another India IPO tracker search result reported ₹285 for Tonbo. That difference is a reminder that GMP figures depend on the source and capture time. Treat every number as a dated snapshot, not a stable market quote; recheck it immediately before acting on it.
Sources: India IPO calendar, accessed 13 October 2026; India IPO GMP tracker.
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The four reported issue sizes range from ₹475 crore for Sahajanand Medical to ₹5,012 crore for Zetwerk. Tonbo’s calendar GMP is the largest in this snapshot, but a higher GMP alone does not establish better investment quality. The sources cited here do not establish valuations, company fundamentals or risk-adjusted attractiveness, and no named statistical study or attributed quotation was identified to support a broader claim.
Quick Recap
- Use the price band and offer documents to understand the offer terms; do not substitute GMP for the offer price.
- Use official filings and notices to confirm dates and final terms; the calendar is a secondary listing.
- Consider GMP only as an unofficial, time-sensitive sentiment indicator, separate from actual listing performance and your investment outcome.
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