# Top 30 companies with in-house R&D in Kolkata

Tamtam tracks 44 companies with in-house R&D headquartered in Kolkata. This list ranks the 30 largest by number of employees on LinkedIn, led by Exide Industries Limited, Century Plyboards (I) Limited and SKIPPER LIMITED. Their median headcount is 1,082. Half of them were founded in 1975 or later.

These Kolkata-based companies with in-house R&D are primarily large, established firms in manufacturing and heavy industry. Many were founded in the mid-20th century. Exide Industries Limited manufactures lead-acid storage batteries, while Century Plyboards (I) Limited produces plywood and laminates. SKIPPER LIMITED specializes in Transmission & Distribution Structures, and Coal India Limited is a state-owned coal mining corporation. Vikram Solar manufactures solar modules, and PCBL Chemical is a carbon black manufacturer.

A notable pattern among these companies is their strong presence in traditional industrial sectors like manufacturing, mining, and construction. There is also a significant representation of companies involved in infrastructure and specialized engineering, such as Bridge and Roof Company (India) Limited and Titagarh, which manufactures railway rolling stock. The majority of these firms have a long operational history, many established before the 2000s, indicating a mature industrial base.

🇮🇳 Kolkata · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Exide Industries Limited](https://www.tamtam.ai/c/exide-industries-limited) (exideindustries.com)<br>A leading brand in India for over 70 years, specializing in manufacturing a wide range of lead-acid storage batteries for various industries globally | Manufacturing | 🇮🇳 Kolkata | 7,296 | 1947 |
| 2 | [Century Plyboards (I) Limited](https://www.tamtam.ai/c/century-plyboards-i-limited) (centuryply.com)<br>Leading manufacturer of plywood, block boards, doors, laminates, and veneers in India, setting new standards in the decoratives industry since 1986 | Wholesale Building Materials | 🇮🇳 Kolkata | 3,646 | 1986 |
| 3 | [SKIPPER LIMITED](https://www.tamtam.ai/c/skipper-limited) (skipperlimited.com)<br>Leading manufacturer of Transmission & Distribution Structures, PVC Pipes & Fittings Top 3 in India, top 10 in the world, with global market reach in 45+ countries | Utilities | 🇮🇳 Kolkata | 2,647 | 1981 |
| 4 | [Coal India Limited](https://www.tamtam.ai/c/coal-india-limited-90357974) (coalindia.in)<br>A leading state-owned coal mining corporation in India with the largest coal production in the world and diverse subsidiary operations | Mining | 🇮🇳 Kolkata | 2,498 | 1975 |
| 5 | [ICA Edu Skills](https://www.tamtam.ai/c/ica-edu-skills) (icajobguarantee.com)<br>India's leading vocational training institute specializing in Computerised Accounting, offering job-oriented courses in Finance and Taxation with practical training and high placement rates | Professional Training and Coaching | 🇮🇳 Kolkata | 2,370 | 1999 |
| 6 | [Vikram Solar](https://www.tamtam.ai/c/vikram-solar) (vikramsolar.com)<br>A leading solar module manufacturer and integrated energy solutions provider, offering EPC and O&M services globally with a focus on high efficiency PV modules | Industrial Machinery Manufacturing | 🇮🇳 Kolkata | 2,081 | 2006 |
| 7 | [Bridge and Roof Company (India) Limited](https://www.tamtam.ai/c/bridge-and-roof-company-india-limited) (bridgeroof.co.in)<br>A multi-disciplinary engineering and construction organization with extensive experience serving major project implementation authorities in India, with high expertise and in-house resources | Construction | 🇮🇳 Kolkata | 1,989 | 1920 |
| 8 | [Ramkrishna Forgings Limited](https://www.tamtam.ai/c/ramkrishna-forgings-limited) (ramkrishnaforgings.com)<br>A global leader in the forging industry, promoting innovation, sustainable growth, and social responsibility with operations in multiple countries | Industrial Machinery Manufacturing | 🇮🇳 Kolkata | 1,887 |  |
| 9 | [PCBL Chemical](https://www.tamtam.ai/c/pcbl-chemical) (pcblltd.com)<br>A leading carbon black manufacturer with over 60 years of experience, operating in India and globally with state-of-the-art production plants and research centers | Chemical Manufacturing | 🇮🇳 Kolkata | 1,731 | 1960 |
| 10 | [Titagarh](https://www.tamtam.ai/c/titagarh) (titagarh.in)<br>A leading Indian manufacturer of railway passenger and freight rolling stock, with global presence spanning India, Italy, and France Specializing in specialized engineering equipment | Automation Machinery Manufacturing | 🇮🇳 Kolkata | 1,556 | 1997 |
| 11 | [Paharpur Cooling Towers](https://www.tamtam.ai/c/paharpur-cooling-towers) (paharpur.com)<br>Global leader in process cooling equipment manufacturing with over 70 years of experience, offering custom solutions for industries worldwide | Construction | 🇮🇳 Kolkata | 1,523 | 1948 |
| 12 | [Usha Martin Limited](https://www.tamtam.ai/c/usha-martin-limited) (ushamartin.com)<br>Leading manufacturer of steel wire rope & related products for various industries worldwide, providing high-performance solutions through state-of-the-art facilities and global service centers | Manufacturing | 🇮🇳 Kolkata | 1,516 | 1960 |
| 13 | [M. N. Dastur & Co. (P) Ltd.](https://www.tamtam.ai/c/m-n-dastur-and-co-p-ltd) (dastur.com)<br>A pioneering engineering consultancy with a global reputation offering integrated design and engineering services for projects across industries worldwide | Mining | 🇮🇳 Kolkata | 1,281 | 1955 |
| 14 | [Himadri Speciality Chemical Ltd.](https://www.tamtam.ai/c/himadri-speciality-chemical-ltd) (himadri.com)<br>Leading specialty chemical company specializing in carbon products, with a focus on innovation, R&D, and vertical integration to cater to global industry needs | Chemical Manufacturing | 🇮🇳 Kolkata | 1,136 | 1987 |
| 15 | [Tega Industries](https://www.tamtam.ai/c/tega-industries) (tegaindustries.com)<br>A global leader in heavy-duty engineering products for mining and material handling industries, with over 47 years of experience and a worldwide presence | Mining | 🇮🇳 Kolkata | 1,082 | 1976 |
| 16 | [TCG Lifesciences Pvt Ltd.](https://www.tamtam.ai/c/tcg-lifesciences-pvt-ltd) (tcgls.com)<br>Global Contract Research and CDMO providing innovative R&D services in pharmaceutical, biotech sectors Specializing in chemistry synthesis, pharmacology, DMPK, and analytical development | Research Services | 🇮🇳 Kolkata | 1,079 | 2001 |
| 17 | [LUMINO INDUSTRIES LIMITED](https://www.tamtam.ai/c/lumino-industries-limited) (luminoindustries.com)<br>Manufacturer of overhead transmission line conductors and AB cables, also offering Engineering Procurement Construction services for last-mile electricity distribution in India | Electrical Equipment Manufacturing | 🇮🇳 Kolkata | 838 | 1989 |
| 18 | [Coal India Limited](https://www.tamtam.ai/c/coal-india-limited) (coalindia.in)<br>A state-owned coal mining corporation in India, CIL is the largest coal producer globally with multiple subsidiaries and training institutes | Mining | 🇮🇳 Kolkata | 836 | 1975 |
| 19 | [Tata Metaliks](https://www.tamtam.ai/c/tata-metaliks) (tatasteel.com)<br>A leading manufacturer of foundry grade Pig Iron and Ductile Iron Pipes, providing the latest updates on products and innovations | Primary Metal Manufacturing | 🇮🇳 Kolkata | 809 | 1994 |
| 20 | [TIL Limited](https://www.tamtam.ai/c/til-limited) (tilindia.in)<br>Manufacturing high-quality material handling and infrastructure equipment with advanced R&D, serving diverse industries across India and maintaining global alliances. | Machinery Manufacturing | 🇮🇳 Kolkata | 787 | 1944 |
| 21 | [Veedol](https://www.tamtam.ai/c/veedol) (veedolindia.com)<br>Leading manufacturer and marketer of quality lubricants in India, catering to automotive and industrial segments with a range of high performance engine oils, gear oils, transmission oils, and greases | Oil and Gas | 🇮🇳 Kolkata | 776 | 1928 |
| 22 | [Aludecor](https://www.tamtam.ai/c/aludecor) (aludecor.com)<br>Manufacturer of high-quality coated and composite products using innovative technologies, eco-friendly materials, and stringent quality checks to meet international standards | Wholesale Building Materials | 🇮🇳 Kolkata | 737 | 2004 |
| 23 | [West Coast Paper Mills](https://www.tamtam.ai/c/west-coast-paper-mills) (westcoastpaper.com)<br>A leading paper producer in India, focused on innovation, sustainability, and quality, serving various industries with environmentally friendly products | Paper and Forest Product Manufacturing | 🇮🇳 Kolkata | 708 | 1961 |
| 24 | [Lalbaba Engineering](https://www.tamtam.ai/c/lalbaba-engineering) (lalbabagroup.com)<br>Manufacturing group founded in 1964 specializing in pneumatic forging, fabrication, and supplying products to Indian Railways and OEMs | Industrial Machinery Manufacturing | 🇮🇳 Kolkata | 601 |  |
| 25 | [Garden Reach Shipbuilders & Engineers Ltd.](https://www.tamtam.ai/c/garden-reach-shipbuilders-and-engineers-ltd) (grse.in)<br>A leading Indian warship building company under Ministry of Defence, specializing in building warships, platforms, engines, and engineering activities since 1884 | Shipbuilding | 🇮🇳 Kolkata | 591 | 1884 |
| 26 | [Pan Seeds](https://www.tamtam.ai/c/pan-seeds) (panseeds.in)<br>Agricultural seed producer specializing in high-quality rice seeds, expanding into other crops and agriculture hand sprayers with a strong distribution network | Farming | 🇮🇳 Kolkata | 582 | 1975 |
| 27 | [SRMB Steel](https://www.tamtam.ai/c/srmb-steel) (srmbsteel.com)<br>A leading Indian reinforcement company with state-of-the-art production of TMT bars and sectional steel products, focused on meeting customer needs | Wholesale Building Materials | 🇮🇳 Kolkata | 577 | 1951 |
| 28 | [Jupiter International Limited](https://www.tamtam.ai/c/jupiter-international-limited) (jil-jupiter.com)<br>India-based solar power solutions company manufacturing high quality poly-crystalline solar cells with global standards Committed to quality, efficiency, and aggressive expansion in the industry | Renewable Energy Semiconductor Manufacturing | 🇮🇳 Kolkata | 543 | 1978 |
| 29 | [Ion Exchange (India) Ltd](https://www.tamtam.ai/c/ion-exchange-india-ltd-kolkata) (ionexchangeglobal.com)<br>Specialists in water and environment management, providing total solutions for water treatment, waste water treatment, recycle, and zero liquid discharge | Water, Waste, Steam, and Air Conditioning Services | 🇮🇳 Kolkata | 517 | 1964 |
| 30 | [WPIL](https://www.tamtam.ai/c/wpil) (wpil.co.in)<br>A multinational pumps and systems company with a focus on specialized pumping products, offering end-to-end EPC solutions for large water distribution systems | Industrial Machinery Manufacturing | 🇮🇳 Kolkata | 454 | 1952 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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## The same list elsewhere in India

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Source: https://www.tamtam.ai/l/r-and-d-companies-kolkata