Four companies from four very different industries have opened their initial public offerings on the same day, asking investors to evaluate businesses ranging from industrial manufacturing and precision engineering to defence technology and life-saving medical devices.

Thursday, October 15, 2026, marks the opening of public subscriptions for Zetwerk Manufacturing Businesses, Bonfiglioli Transmissions, Tonbo Imaging India and Sahajanand Medical Technologies. Together, their offerings amount to approximately ₹8,874 crore.

The timing is particularly interesting because these companies are not simply competing for customers in their respective industries. For the next few trading sessions, they are also competing for attention and capital in India’s primary market.

All four IPOs are scheduled to remain open until October 19, with their tentative stock market listings expected on October 23. But behind the common subscription window are four fundamentally different investment stories.

Zetwerk is the largest offering, with an issue size of approximately ₹5,012 crore and a price band of ₹143–₹151 per share. The minimum retail application comprises 99 shares, requiring ₹14,949 at the upper price band.

The company operates a technology-enabled manufacturing platform that connects industrial customers with manufacturing capabilities across multiple product categories.

Unlike a traditional manufacturer that relies entirely on its own factories, Zetwerk’s business involves coordinating a wider manufacturing ecosystem, making supplier relationships, execution quality and working-capital management especially important.

Its operations span sectors including energy, industrial products and precision manufacturing. This provides exposure to several long-term industrial trends, but it also creates operational complexity.

One of the most interesting details is Zetwerk’s exposure to energy-related products, which account for a substantial portion of its revenue. This links the company to capital expenditure in power generation, renewable energy and industrial infrastructure.

That connection invites comparisons with listed industrial companies such as Bharat Heavy Electricals, Siemens India and ABB India. However, these businesses have different manufacturing models, product portfolios and profitability structures.

Zetwerk’s investment case therefore cannot be assessed simply by applying the valuation multiples of established industrial equipment manufacturers. The company’s IPO includes approximately ₹2,830 crore of fresh equity and ₹2,182 crore through an offer for sale.

This distinction is important because fresh-issue proceeds go to the company, while offer-for-sale proceeds go to the selling shareholders.

Zetwerk intends to use a significant portion of its fresh capital for debt repayment, alongside other corporate purposes. Lower borrowings could potentially improve future interest costs and financial flexibility.

However, investors must also examine the company’s history of losses, cash generation, customer concentration and dependence on its manufacturing partner network.

The second major IPO comes from Bonfiglioli Transmissions, an industrial power transmission and drive solutions business with Italian origins and an established presence in India.

Bonfiglioli’s approximately ₹2,534 crore public issue carries a price band of ₹558–₹586 per share. Its minimum application size is 25 shares, translating into ₹14,650 at the upper band.

Unlike Zetwerk, Bonfiglioli’s offering is entirely an offer for sale. That means the IPO provides an opportunity for existing shareholders to sell shares, rather than raising fresh funds for the company’s operations.

The company operates in a less glamorous but economically important part of manufacturing: the mechanical systems that help industrial equipment transfer power and control movement.

Gearboxes, geared motors and transmission systems are essential components in industries where machinery must operate reliably under demanding conditions. This creates potential connections with industrial automation, material handling, infrastructure equipment and renewable energy applications.

For listed-market comparisons, investors may examine businesses such as Elecon Engineering, which operates in industrial gears and material handling equipment, and Shanthi Gears, which manufactures industrial gearing solutions.

The important comparison is not merely which company sells more equipment. Investors should examine product specialization, export exposure, operating margins, customer relationships and the ability to develop technically advanced solutions.

Bonfiglioli’s international background may provide technological and customer-network advantages, but investors also need to consider how its Indian operations compare with established domestic competitors.

The third IPO brings an entirely different theme into focus: indigenous defence electronics. Tonbo Imaging India’s ₹852 crore offering is priced between ₹665 and ₹700 per share, with a minimum application of 21 shares costing ₹14,700 at the upper end.

The company develops advanced imaging and sensing technologies used in defence, surveillance and other demanding environments.

Its work in electro-optics, thermal imaging and night-vision-related systems places it within an increasingly important area of India’s defence technology ecosystem.

The wider opportunity comes from the growing emphasis on domestic defence manufacturing and the development of specialized electronic systems.

But there is a major difference between producing conventional defence equipment and developing sophisticated imaging technologies. The latter can require extensive research, specialized engineering, testing and customer-specific product development.

This makes Tonbo an interesting business to examine alongside listed defence electronics companies such as Bharat Electronics and Data Patterns.

Bharat Electronics operates at a much larger scale across multiple defence electronics categories, while Data Patterns has a specialized presence in electronic systems and subsystems.

These comparisons help explain the competitive landscape, but they do not make the companies interchangeable.

For Tonbo, investors should focus on its technological capabilities, order execution, customer concentration, research expenditure and the sustainability of demand.

Another important consideration is that Tonbo’s IPO is structured as an offer for sale. The company will not receive fresh growth capital from the public issue itself.

That matters because advanced technology businesses may require continuous investment in engineering, product development and manufacturing capabilities. The fourth offering is the smallest by issue size, but its products address an entirely different kind of demand.

Sahajanand Medical Technologies, commonly known as SMT, has launched an approximately ₹475 crore IPO with a price band of ₹327–₹344 per share.

The minimum retail application is 43 shares, requiring ₹14,792 at the upper price band. SMT manufactures medical devices, including coronary stents used in cardiovascular treatment.

Unlike industrial equipment manufacturers, medical device companies operate in a highly regulated environment where clinical performance, quality standards and regulatory approvals can influence commercial success.

The company’s business also connects to a broader healthcare trend: rising demand for advanced treatment technologies alongside pressure to keep medical procedures affordable.

For investors, the relevant competitive landscape includes domestic medical device manufacturers and multinational companies supplying cardiovascular products.

However, comparing SMT directly with hospital operators such as Apollo Hospitals or healthcare service providers would be misleading because their business models and revenue drivers are substantially different.

SMT’s offering is also entirely an offer for sale, meaning existing shareholders receive the proceeds rather than the company.

This is where the four IPOs reveal their most important structural difference. Zetwerk is raising fresh capital as well as facilitating shareholder exits, while Bonfiglioli, Tonbo and SMT are offering shares through existing shareholders.

That difference does not automatically make a fresh issue better than an OFS. A profitable, financially strong business may not need additional capital, while a company raising fresh funds still needs to demonstrate that it can deploy them effectively.

The real challenge for investors is comparing businesses that operate in completely different industries without being distracted by headline issue sizes or unofficial grey-market premiums.

A high grey-market premium may indicate speculative enthusiasm, but it does not establish fair value or guarantee a profitable listing.

Likewise, a smaller IPO does not necessarily represent a smaller opportunity. Market capitalization, earnings, growth potential, cash generation and valuation determine much more than the amount being offered to investors.

The October 15 IPO wave therefore provides a revealing snapshot of India’s expanding equity market. Industrial supply chains, precision engineering, defence electronics and medical technology are all seeking greater visibility among public investors.

The most useful question is not simply which IPO attracts the highest subscription. It is which business can convert its competitive strengths into sustainable profits, healthy cash flows and long-term shareholder value after the listing excitement fades.