# The 50 largest companies with in-house R&D in West Bengal

Tamtam tracks 54 companies with in-house R&D headquartered in West Bengal. This list ranks the 50 largest by number of employees on LinkedIn, led by Exide Industries Limited, Indian Institute of Technology, Kharagpur and Century Plyboards (I) Limited. Their median headcount is 708. Half of them were founded in 1977 or later. The most common headquarters are Kolkata (41).

The companies with in-house R&D in West Bengal include a mix of large established enterprises and some mid-sized firms, predominantly in manufacturing and heavy industry. Exide Industries specializes in lead-acid storage batteries, while Century Plyboards manufactures plywood and laminates. SKIPPER LIMITED produces transmission structures and PVC pipes, and Vikram Solar is a solar module manufacturer. Coal India Limited operates in coal mining, and Titagarh manufactures railway rolling stock.

A clear pattern is the concentration of headquarters in Kolkata, indicating the city's role as a commercial and industrial hub within the region. The sectors represented include diversified manufacturing, chemicals, construction, and mining, alongside some professional training and higher education institutions.

🇮🇳 West Bengal · 50 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 | [Indian Institute of Technology, Kharagpur](https://www.tamtam.ai/c/indian-institute-of-technology-kharagpur) (iitkgp.ac.in)<br>An autonomous university in India, with 27 departments, offering education to over 10,000 students and employing 1,700 staff members | Higher Education | 🇮🇳 Kharagpur | 5,882 | 1951 |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [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 |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |  |
| 10 | [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 |
| 11 | [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 |
| 12 | [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 |
| 13 | [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 |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [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 |
| 20 | [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 |
| 21 | [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 |
| 22 | [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 |
| 23 | [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 |
| 24 | [HEG limited](https://www.tamtam.ai/c/heg-limited) (hegltd.com)<br>An ISO certified graphite company with largest integrated plant globally, specializing in graphite electrodes and specialities, with strong focus on exports | Manufacturing | 🇮🇳 A-12 Sector-1 | 732 | 1977 |
| 25 | [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 |
| 26 | [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 |  |
| 27 | [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 |
| 28 | [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 |
| 29 | [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 |
| 30 | [Indian Institute of Engineering Science and Technology (IIEST), Shibpur](https://www.tamtam.ai/c/indian-institute-of-engineering-science-and-technology-iiest-shibpur) (iiests.ac.in)<br>National engineering and research institution offering bachelor's, master's, and doctorate degrees in engineering, architecture, science, and management since 1856 Located in West Bengal | Research Services | 🇮🇳 Howrah | 576 | 1856 |
| 31 | [Amity University Kolkata](https://www.tamtam.ai/c/amity-university-kolkata) (amity.edu)<br>Provider of globally benchmarked, research-oriented education with industry-oriented academic programs and sprawling campus facilities comparable to Ivy League universities | Higher Education | 🇮🇳 Kadampukur Village | 574 | 2014 |
| 32 | [IISER KOLKATA](https://www.tamtam.ai/c/iiser-kolkata) (iiserkol.ac.in)<br>An autonomous institution integrating education with research through undergraduate teaching, doctoral and postdoctoral research programs in various disciplines | Research Services | 🇮🇳 Nadia | 563 | 2006 |
| 33 | [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 |
| 34 | [TATA MEDICAL CENTER](https://www.tamtam.ai/c/tata-medical-center) (tmckolkata.com)<br>Integrated oncology facility providing comprehensive cancer care, education, and research with a philanthropic approach, serving all sections of society | Hospitals and Health Care | 🇮🇳 Rajarhat | 521 | 2004 |
| 35 | [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 |
| 36 | [UNIVERSITY OF SCIENCE AND TECHNOLOGY, MEGHALAYA](https://www.tamtam.ai/c/university-of-science-and-technology-meghalaya) (ustm.ac.in)<br>A private university in North East India offering accredited science & technology programs, promoting research, innovation, invention, and entrepreneurship for regional development | Higher Education | 🇮🇳 Technocity | 494 |  |
| 37 | [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 |
| 38 | [Indian Institute of Science Education & Research (IISER), Kolkata](https://www.tamtam.ai/c/indian-institute-of-science-education-and-research-iiser-kolkata) (iiserkol.ac.in)<br>This organization focuses on integrating teaching and cutting-edge research at research universities to make basic sciences more attractive and accessible | Higher Education | 🇮🇳 Kalyani | 453 |  |
| 39 | [Websol Energy System Limited](https://www.tamtam.ai/c/websol-energy-system-limited) (webelsolar.com)<br>A leading manufacturer in India of high-quality photovoltaic monocrystalline solar cells and modules for various applications since 1994 | Renewable Energy Power Generation | 🇮🇳 Kolkata | 407 | 1994 |
| 40 | [Crescent Foundry](https://www.tamtam.ai/c/crescent-foundry) (crescentfoundry.com)<br>A prominent Indian exporter established in 1982 specializing in ferrous castings such as counterweights, municipal, agricultural, and other OEM products | Manufacturing | 🇮🇳 Kolkata | 405 | 1982 |
| 41 | [UDYOGI](https://www.tamtam.ai/c/udyogi) (udyogisafety.com)<br>The company provides integrated safety solutions, products, services, and training that comply with global standards, focusing on risk assessment and proactive safety management | Public Safety | 🇮🇳 Kolkata | 391 | 1982 |
| 42 | [Re](https://www.tamtam.ai/c/re) (eastindiapharma.org)<br>A biotechnology organization specializing in pharmaceutical development, located in Kolkata, India | Biotechnology Research | 🇮🇳 Kolkata | 364 |  |
| 43 | [Sister Nivedita University](https://www.tamtam.ai/c/sister-nivedita-university) (ac.in)<br>A university in New Town, Kolkata offering a wide range of educational programs and research in various disciplines, focusing on skill development and women empowerment | Education Administration Programs | 🇮🇳 Kolkata | 335 |  |
| 44 | [La Opala RG Ltd.](https://www.tamtam.ai/c/la-opala-rg-ltd) (laopala.in)<br>A leading tableware company in India manufacturing and marketing lifestyle products in the glass and glassware segment under various brands | Manufacturing | 🇮🇳 Kolkata | 334 | 1987 |
| 45 | [Shyam Steel India](https://www.tamtam.ai/c/shyam-steel-india) (shyamsteel.com)<br>A leading steel organization in India, known for quality products in infrastructure projects due to innovation, excellence, and dedication | Wholesale Building Materials | 🇮🇳 New Town | 318 | 1953 |
| 46 | [Balaji Solutions Limited](https://www.tamtam.ai/c/balaji-solutions-limited) (balajisolutions.in)<br>A leading electronics manufacturer in India producing chargers, cables, powerbanks, earphones, and more, with a focus on quality and consumer preferences | Computer Hardware Manufacturing | 🇮🇳 Kolkata | 310 | 2001 |
| 47 | [Susrut Eye Foundation & Research Centre](https://www.tamtam.ai/c/susrut-eye-foundation-and-research-centre) (susrut.org)<br>A hospital and healthcare company in Kolkata, India, specializing in eye care, research, and providing medical services to the community | Hospitals and Health Care | 🇮🇳 Kolkata | 302 |  |
| 48 | [ESKAG Pharma (P) Ltd.](https://www.tamtam.ai/c/eskag-pharma-p-ltd) (eskag.in)<br>A pharmaceutical company within Eskag Group specializing in manufacturing and marketing a wide range of specialty medicines and healthcare products | Pharmaceutical Manufacturing | 🇮🇳 Kolkata | 278 | 1972 |
| 49 | [The Institute of Neurosciences Kolkata](https://www.tamtam.ai/c/the-institute-of-neurosciences-kolkata) (neurokolkata.org)<br>A state-of-the-art institute in Kolkata specializing in neurological disorders research and treatment, offering comprehensive programs for adults and children | Hospitals and Health Care | 🇮🇳 Kolkata | 267 |  |
| 50 | [MSR IT Ltd.](https://www.tamtam.ai/c/msr-it-ltd) (msrlimited.com)<br>Global technology provider delivering business solutions and consultancy services through industry-specific offerings like software development, technical support, and infrastructure management to clients worldwide | Technology, Information and Internet | 🇮🇳 Kolkata | 255 | 2003 |

## 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.

## More company lists in West Bengal

- [The largest companies in West Bengal](https://www.tamtam.ai/l/largest-companies-west-bengal) (683)
- [Manufacturers in West Bengal](https://www.tamtam.ai/l/manufacturers-west-bengal) (128)
- [Education providers in West Bengal](https://www.tamtam.ai/l/education-companies-west-bengal) (91)
- [Multinational companies in West Bengal](https://www.tamtam.ai/l/multinational-companies-west-bengal) (75)
- [Publicly traded companies in West Bengal](https://www.tamtam.ai/l/publicly-traded-companies-west-bengal) (58)
- [Retail chains in West Bengal](https://www.tamtam.ai/l/retail-chains-west-bengal) (57)
- [Critical infrastructure operators in West Bengal](https://www.tamtam.ai/l/critical-infrastructure-operators-west-bengal) (52)
- [Corporate groups and holding companies in West Bengal](https://www.tamtam.ai/l/holding-companies-west-bengal) (52)
- [IT Services and IT Consulting companies in West Bengal](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-west-bengal) (51)
- [Public sector organisations in West Bengal](https://www.tamtam.ai/l/public-sector-organisations-west-bengal) (49)
- [Financial services firms in West Bengal](https://www.tamtam.ai/l/financial-services-firms-west-bengal) (46)
- [Higher Education companies in West Bengal](https://www.tamtam.ai/l/higher-education-companies-west-bengal) (46)
- [Healthcare providers in West Bengal](https://www.tamtam.ai/l/healthcare-providers-west-bengal) (42)
- [IT services companies in West Bengal](https://www.tamtam.ai/l/it-services-companies-west-bengal) (38)
- [Financial Services companies in West Bengal](https://www.tamtam.ai/l/financial-services-companies-west-bengal) (37)
- [Hospitals and Health Care companies in West Bengal](https://www.tamtam.ai/l/hospitals-and-health-care-companies-west-bengal) (37)
- [Energy companies in West Bengal](https://www.tamtam.ai/l/energy-companies-west-bengal) (36)
- [Education Administration Programs companies in West Bengal](https://www.tamtam.ai/l/education-administration-programs-companies-west-bengal) (32)
- [Consumer goods companies in West Bengal](https://www.tamtam.ai/l/consumer-goods-companies-west-bengal) (28)
- [Mining companies in West Bengal](https://www.tamtam.ai/l/mining-companies-west-bengal) (28)
- [Chemical companies in West Bengal](https://www.tamtam.ai/l/chemical-companies-west-bengal) (26)
- [E-commerce companies in West Bengal](https://www.tamtam.ai/l/ecommerce-companies-west-bengal) (26)
- [Companies with a mobile app in West Bengal](https://www.tamtam.ai/l/companies-with-mobile-app-west-bengal) (25)
- [Manufacturing companies in West Bengal](https://www.tamtam.ai/l/manufacturing-companies-west-bengal) (25)

## The same list elsewhere in India

- [Companies with in-house R&D in India](https://www.tamtam.ai/l/r-and-d-companies-india) (1,990)
- [Companies with in-house R&D in Maharashtra](https://www.tamtam.ai/l/r-and-d-companies-maharashtra) (514)
- [Companies with in-house R&D in Karnataka](https://www.tamtam.ai/l/r-and-d-companies-karnataka) (271)
- [Companies with in-house R&D in Tamil Nadu](https://www.tamtam.ai/l/r-and-d-companies-tamil-nadu) (226)
- [Companies with in-house R&D in Haryana](https://www.tamtam.ai/l/r-and-d-companies-haryana) (166)
- [Companies with in-house R&D in Gujarat](https://www.tamtam.ai/l/r-and-d-companies-gujarat) (143)
- [Companies with in-house R&D in Uttar Pradesh](https://www.tamtam.ai/l/r-and-d-companies-uttar-pradesh) (124)
- [Companies with in-house R&D in Telangana](https://www.tamtam.ai/l/r-and-d-companies-telangana) (69)
- [Companies with in-house R&D in Rajasthan](https://www.tamtam.ai/l/r-and-d-companies-rajasthan) (41)
- [Companies with in-house R&D in Andhra Pradesh](https://www.tamtam.ai/l/r-and-d-companies-andhra-pradesh) (36)
- [Companies with in-house R&D in Kerala](https://www.tamtam.ai/l/r-and-d-companies-kerala) (36)
- [Companies with in-house R&D in Punjab](https://www.tamtam.ai/l/r-and-d-companies-punjab) (34)
- [Companies with in-house R&D in Mumbai](https://www.tamtam.ai/l/r-and-d-companies-mumbai) (258)
- [Companies with in-house R&D in Bengaluru](https://www.tamtam.ai/l/r-and-d-companies-bengaluru) (235)
- [Companies with in-house R&D in Pune](https://www.tamtam.ai/l/r-and-d-companies-pune) (149)
- [Companies with in-house R&D in Chennai](https://www.tamtam.ai/l/r-and-d-companies-chennai) (132)
- [Companies with in-house R&D in New Delhi](https://www.tamtam.ai/l/r-and-d-companies-new-delhi) (126)
- [Companies with in-house R&D in Gurugram](https://www.tamtam.ai/l/r-and-d-companies-gurugram) (124)
- [Companies with in-house R&D in Noida](https://www.tamtam.ai/l/r-and-d-companies-noida) (75)
- [Companies with in-house R&D in Hyderabad](https://www.tamtam.ai/l/r-and-d-companies-hyderabad) (72)
- [Companies with in-house R&D in Ahmedabad](https://www.tamtam.ai/l/r-and-d-companies-ahmedabad) (57)
- [Companies with in-house R&D in Kolkata](https://www.tamtam.ai/l/r-and-d-companies-kolkata) (44)
- [Companies with in-house R&D in Coimbatore](https://www.tamtam.ai/l/r-and-d-companies-coimbatore) (41)
- [Companies with in-house R&D in Vadodara](https://www.tamtam.ai/l/r-and-d-companies-vadodara) (40)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Asia](https://www.tamtam.ai/l/r-and-d-companies-in-asia) (4,166)

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