| # | Company | Employees |
|---|---|---|
| 1 |
Indian Oil Corp Limitediocl.com
Leading energy company specializing in oil refining, distribution, and marketing, ranked among the world's largest corporations globally. |
41,695 |
| 2 |
Indian Railwaysgov.in
State-owned national transporter responsible for rail transport in India, operated by the Government of India through the Ministry of Railways Third largest railway network globally |
33,129 |
| 3 |
NTPC Limitedntpc.co.in
India's largest power generation utility, operating across fossil fuels, hydro, nuclear, and renewable energy sources, with a diversified portfolio including consultancy and training services |
26,494 |
| 4 |
Punjab National Bankbank.in
A national bank founded to further India's economic interests, providing services through a technology-driven approach to millions of customers nationwide for over 122 years |
25,265 |
| 5 |
GMR Groupgmrgroup.in
operates airports, generates energy, develops urban infrastructure, manages transportation, and owns sports teams, all while committing to community development. |
18,287 |
| 6 |
Oil and Natural Gas Corporation Ltdongcindia.com
Largest Indian crude oil, natural gas producer. Integrated energy company with exploration, production, refining, petrochemicals, renewables, and global oil and gas properties. |
16,674 |
| 7 |
Max Healthcaremaxhealthcare.in
A leading provider of integrated healthcare services in India, offering treatment across 30 specialties with a network of 19 facilities and 4800+ doctors |
13,180 |
| 8 |
Department of Posts, Indiaindiapost.gov.in
Provider of high quality mail, parcel, and related services globally, exceeding customer expectations with efficient, reliable, and innovative solutions while prioritizing employee development and social responsibility |
11,065 |
| 9 |
AIIMS (All India Institute of Medical Sciences, New Delhi)aiims.edu
Established as a center of excellence in medical education and research, focusing on training highly qualified healthcare professionals and promoting self-sufficiency in post-graduate medical education |
9,381 |
| 10 |
GAIL (India) Limitedgailonline.com
Largest natural gas company in India with operations in transmission, marketing, processing, LPG, petrochemicals, city gas, and exploration. |
9,153 |
| 11 |
Niva Bupa Health Insurancenivabupa.com
A health insurance joint venture aiming to empower customers with knowledge and services, building long-term relationships to instill confidence in accessing healthcare |
8,282 |
| 12 |
Airports Authority of Indiaaai.aero
A national organization managing and developing civil aviation infrastructure, including airports and air space, serving millions of passengers and aircraft annually |
7,845 |
| 13 |
PNB Housing Finance Limitedpnbhousing.com
A leading public sector housing finance company offering competitive home loans, non home loans, deposits, and modern financial services with strong safety ratings |
7,183 |
| 14 |
Indian Oil Corporation Limited (Iocl)iocl.com
A state-owned oil and gas company in India with headquarters in New Delhi and a registered office in Mumbai |
4,926 |
| 15 |
All India Institute of Medical Sciencesaiims.edu
A prestigious medical college and hospital in New Delhi, India, known for providing low-cost and high-quality medical care to a large number of patients |
4,793 |
| 16 |
The Oriental Insurance Company Ltd.orientalinsurance.org.in
A leading general insurance provider in India, with extensive domestic and international operations, a large employee base, and high credit ratings |
4,283 |
| 17 |
Religarereligare.com
A diversified financial services group offering loans, insurance, and retail broking to a wide range of clients, with numerous awards for excellence |
3,746 |
| 18 |
Oil & Natural Gas Corporation Limited (Ongc)ongcindia.com
Leading Indian company in crude oil and natural gas production, supplying significant portion of domestic market Raw material for downstream petroleum production |
3,382 |
| 19 |
Oil and Natural Gas Corporation Limited (ONGC)ongcindia.com
A leading Indian government-owned oil and gas explorer and producer, responsible for a significant portion of India's domestic production |
3,040 |
| 20 |
PUBLIC WORKS DEPARTMENTpwddelhi.gov.in
A governmental agency in Delhi focused on planning, designing, constructing, and maintaining various assets in the built environment and infrastructure development sectors |
2,594 |
| 21 |
India Post Payments Bankippbonline.com
An accessible and affordable bank under the Department of Post, aiming to promote cashless transactions and financial inclusion in India |
2,513 |
| 22 |
National Informatics Centernic.gov.in
This Indian-based computer software company, focuses on providing information technology services |
2,438 |
| 23 |
BSES Delhibsesdelhi.com
Delhi-based power distribution entities serving over 28 lakh customers in two thirds of the city, with separate coverage areas and customer bases |
2,404 |
| 24 |
RailTel Corporation of India Ltdrailtel.in
A leading telecom infrastructure provider with a vast optic fiber network across India, offering services like MPLS-VPN, data centers, and public Wi-Fi at railway stations |
2,336 |
| 25 |
Holy Family Hospitalholyfamilyhospitaldelhi.org
A hospital in New Delhi, established in 1953, operates under the Delhi Catholic Archdiocese, with a focus on providing compassionate healthcare services |
2,280 |
| 26 |
Tata Power-DDLtatapower-ddl.com
Delivering electricity and implementing power distribution reforms, including smart metering and solar projects, while empowering underprivileged communities through social initiatives |
2,131 |
| 27 |
Delhi International Airport Ltdnewdelhiairport.in
Major international airport in India's capital, offering extensive domestic & international connectivity, with focus on sustainability and operated through a PPP consortium |
2,116 |
| 28 |
Excitel Broadbandexcitel.com
An Indian-based broadband company with European roots, Excitel provides high-speed internet to over 8,50,000 homes through a vast network across India |
2,064 |
| 29 |
BLK - Max Super Speciality Hospitalblkmaxhospital.com
A leading tertiary care hospital in India, BLK-Max focuses on excellence in healthcare with advanced technology, transplant programs, and high-quality patient care |
2,013 |
| 30 | 1,911 | |
| 31 |
HPCL North Zone Allied Retail Businesshindustanpetroleum.com
A Fortune 500 entity in the petroleum industry with a vast retail network offering various commercial activities at its outlets |
1,869 |
| 32 |
SATYA MicroCapital Limitedsatyamicrocapital.com
Microfinance institution providing affordable credit services to women entrepreneurs in rural areas, focusing on financial empowerment and socio-economic upliftment through a technology-driven approach |
1,809 |
| 33 |
Tulip Telecomtulip.net
A leading provider of enterprise communications services with a global reach, offering network design, implementation, management, and value-added services |
1,638 |
| 34 |
National Highways Authority of Indianhai.gov.in
Leading organization responsible for developing and maintaining national highways in India, established through the NHAI Act of 1988 |
1,613 |
| 35 |
Airport Authority Of Indiaonlinecareer360.com
A statutory body under the Ministry of Civil Aviation in India responsible for developing and managing civil aviation infrastructure |
1,594 |
| 36 |
AI Airport Services Limitedaiasl.in
Ai Airport Services Limited is a company based in New Delhi, India, providing services related to airport operations and airline support |
1,589 |
| 37 |
Northern Railwaynr.indianrailways.gov.in
A transportation company headquartered in New Delhi, operating across nine states and union territories through five divisions serving different regions |
1,518 |
| 38 |
Celebi Airport Services India Pvt. Ltd.celebiaviation.com
Provider of world-class ground handling services to airlines at various Indian airports, offering a range of aviation solutions globally |
1,477 |
| 39 |
Rail Vikas Nigam Limitedrvnl.org
A construction arm of the Ministry of Railways, RVNL implements transportation infrastructure projects on a fast-track basis, with a focus on quality, speed, and transparency |
1,435 |
| 40 |
Aviom India Housing Finance Private Limitedaviom.in
A company specializing in providing housing loans in rural and semi-urban areas, focusing on women empowerment by catering to informal income borrowers |
1,426 |
| 41 |
Vardhman Mahavir Medical College and Safdarjung Hospitalvmmc-sjh.nic.in
A higher education institution providing medical education and healthcare services in New Delhi, India |
1,376 |
| 42 |
DEN Networks Limiteddennetworks.com
A leading cable TV distribution company in India, reaching 13 million households in over 200 cities, offering digital cable services and content distribution with major media partners |
1,373 |
| 43 |
THINK Gasthink-gas.com
An environmentally conscious company supplying clean fuel through City Gas Distribution in multiple districts across India for various sectors |
1,342 |
| 44 |
NHAI InvIT (National Highways Infra Trust)nhit.co.in
The company is an infrastructure investment trust focused on investing in special purpose vehicles and infrastructure projects in India |
1,293 |
| 45 |
Indraprastha Apollo Hospitals , New Delhiapollohospitals.com
A leading multi-specialty hospital in India, known for its advanced medical technology, experienced doctors, and high-quality healthcare services since 1996 |
1,272 |
| 46 |
PTC India Limitedptcindia.com
A government-backed initiative focused on promoting power trading, attracting investments in the power sector, and establishing a power market in India and neighboring countries |
1,201 |
| 47 |
Indian Railways (IR)indianrailways.gov.in
A statutory body under the Ministry of Railways, Government of India, operating the fourth largest national railway system globally |
1,187 |
| 48 |
Sitara (SEWA Grih Rin Limited)sgrlimited.in
Affordable housing finance provider based in New Delhi, India, operating under the brand name 'Sitara' |
1,094 |
| 49 |
ONGC Videsh Ltdongcvidesh.com
Specializing in running exploration and production projects internationally, focusing on operations in the oil and gas industry |
1,073 |
| 50 |
National Heart Institutenationalheartinstitute.com
A pioneering cardiac care institute providing quality medical care, research, and treatment, with a focus on serving both paying and underserved populations |
1,054 |
| 51 |
Rajiv Gandhi Cancer Institute and Research Centrergcirc.org
A leading non-profit cancer treatment and research institute in Delhi, India, offering cutting-edge technology and world-class care to patients across Asia |
1,028 |
| 52 |
Ujala Cygnusujalacygnus.com
The company focuses on providing quality, affordable, and convenient healthcare services to Tier2 & Tier3 communities, emphasizing inclusivity and value-based care |
1,015 |
| 53 |
National Capital Region Transport Corporation (NCRTC)ncrtc.in
NCRTC is mandated to implement the Regional Rapid Transit System project connecting the National Capital Region, promoting sustainable development and better connectivity |
1,000 |
| 54 |
DMI Finance Private Limiteddmifinance.in
DMI Finance provides tech-driven credit solutions to corporate borrowers in India, offering various types of financing and supporting fintech companies |
961 |
| 55 |
Ministry of Railways, Government of Indiaindianrailways.gov.in
Government ministry overseeing Indian Railways, managing one of the world's largest railway systems with extensive route length and a large number of employees |
953 |
| 56 |
ECHS POLY CLINICechs.gov.in
A hospital and health care facility located in New Delhi, India, providing medical services in a complex on Lodi Road |
941 |
| 57 |
Central Water Commissioncwc.gov.in
A premier technical organization in India focused on water resources, responsible for schemes and projects related to flood control, irrigation, and water power development |
901 |
| 58 |
Punjab National Bankpnbindia.in
Founded in 1895, this national bank in India serves millions of customers with technology-driven products and services, boasting a strong brand image and presence |
872 |
| 59 |
Telesonic Networks Limitedairtel.in
Provider of end-to-end wireline network management and transformation services, specializing in next-generation technologies with scalable and cost-effective solutions |
864 |
| 60 |
Petronet LNG Limitedpetronetlng.in
Leading player in India's energy security drive, importing LNG and setting up terminals with prominent oil and gas industry partners |
851 |
| 61 | 848 | |
| 62 |
Aiims Hospital New Delhiaiims.edu
A hospital and healthcare company located in New Delhi, India, providing medical services and care for patients in various specialties |
841 |
| 63 |
Delhi Metro Rail Corporation (DMRC)delhimetrorail.com
A center-state joint venture involved in planning, implementing, and operating metro rail, monorail, and high-speed rail projects in India and abroad |
840 |
| 64 |
Tata Power Delhi Distribution Limitedtatapower-ddl.com
An utilities company in Delhi, India that focuses on power distribution, specifically providing electricity services to residents and businesses |
831 |
| 65 |
AAICLASaaiclas-ecom.org
The company specializes in managing Cargo Terminal Operations, Free Trade Zones, Air Freight Stations, and Inland Container Depots for cargo and passengers |
824 |
| 66 |
Dr. Ram Manohar Lohia Hospital(PGIMER)rmlh.nic.in
A prestigious Central Government hospital in New Delhi, providing healthcare services to millions of patients, offering specialized care, emergency services, and medical education |
812 |
| 67 |
Aakash Healthcare Super Speciality Hospitalaakashhealthcare.com
A premium healthcare facility in Delhi NCR specializing in orthopedic, cardiac, neurology, and renal services with advanced technology and compassionate staff |
792 |
| 68 |
BSESbsesdelhi.com
A leading electricity distributor in Delhi, supplying power to two-thirds of the capital with a focus on technology, sustainability, and customer satisfaction |
778 |
| 69 |
National High Speed Rail Corporation Ltd (NHSRCL)nhsrcl.in
NHSRCL implements high-speed rail projects in India, including the Mumbai-Ahmedabad corridor spanning 50817km with 12 stations and two depots Contact: Media@NHSRCLin |
757 |
| 70 |
JWIL INFRA LIMITEDjwil.in
A leading EPC company in the water and wastewater sector, providing holistic solutions from design to commissioning, with a focus on excellence, agility, and reliability |
746 |
| 71 |
Pawan Hans Ltd.pawanhans.co.in
Established in 1985, India's largest operator with a fleet of 46 helicopters, offering maintenance services and having flown over 5,00,000 hours |
733 |
| 72 |
GlobeGround Indiaglobeground.in
A ground handling organization in India, offering high-quality services at various airports through a commitment to efficiency, professionalism, and customer satisfaction |
732 |
| 73 |
Maharaja Agrasen Hospitalmahdelhi.org
Specializing in multi medical services, providing quality healthcare for all, with a focus on patient safety as the top priority |
727 |
| 74 |
Sri Balaji Action Medical Instituteactionhospital.in
A healthcare institute providing world-class facilities with a humanitarian touch, offering free medical care to the needy, guided by ethical standards |
721 |
| 75 |
Container Corporation of India Ltdconcorindia.co.in
A leading company in containerized multimodal logistics services, providing infrastructure, storage, customs clearance, and value-added services for domestic and international trade |
719 |
| 76 |
Power Finance Corporation Ltd.pfcindia.co.in
An Infrastructure Finance Company established by the Govt of India in 1986, dedicated to financing and developing the power sector in the country |
714 |
| 77 |
Lady Hardinge Medical College - LHMC New Delhilhmc-hosp.gov.in
A premier institution in New Delhi, India, focused on medical education and healthcare services |
708 |
| 78 |
DCDC Kidney Caredcdc.co.in
A healthcare facility specializing in dialysis care for patients with end stage renal disease, with multiple centers in Delhi & NCR region |
707 |
| 79 |
Paisalo Digital Limitedpaisalo.in
Utilizing AI and ML, the company offers seamless small-ticket loans with a focus on rural and semi-urban areas in India |
700 |
| 80 | 680 | |
| 81 |
CRIS; A Autonomous Society under the Ministry of Indian Railwayscris.org.in
A government-established organization in New Delhi, India that manages computer activities and develops major systems for the Indian Railways |
678 |
| 82 |
Delhi Integrated Multi Modal Transit System Ltd. (DIMTS)dimts.in
An urban transport and infrastructure development consultancy providing Concept-to-Commissioning services, Intelligent Transport System solutions, and asset management for government projects |
666 |
| 83 |
Delhi Transport Corporationdtc.delhi.gov.in
Government relations office based in New Delhi, India, serving the Delhi Transport Corporation |
659 |
| 84 |
All India Institute of Medical Sciences (AIIMS)aiims.edu
A public medical research university and hospital in New Delhi, India, operating autonomously under the Ministry of Health and Family Welfare |
649 |
| 85 |
Hero Future Energiesherofutureenergies.com
A global renewable energy company with 45 GW of assets across multiple countries, focusing on advanced projects and working with hard-to-abate sectors on their net-zero journey |
630 |
| 86 |
Max Super Specialit Hospital New Delhimaxhealthcare.com
A hospital and healthcare company located in New Delhi, India, specializing in super specialty medical services for patients |
615 |
| 87 |
Celebi Delhi Cargo Terminal Management India Private Limitedcelebiaviation.com
A global aviation services provider offering ground handling, cargo, warehouse management, pharma, and perishable services with over 60 years of experience |
585 |
| 88 |
Gateway Distriparks Limitedgatewaydistriparks.com
Integrated inter-modal logistics service provider offering general & bonded warehousing, rail & road transportation, container handling, and temperature-controlled logistics services across India |
582 |
| 89 |
Ministry of Railwaysindianrailways.gov.in
Official account representing Ministry of Railways, India, overseeing the country's railway infrastructure and services for efficient transportation |
563 |
| 90 |
Hindu Rao Hospitalhindurao.com
A large multi-specialty hospital providing free OPD and in-patient services, as well as reasonably priced Nursing Home facilities, catering to a diverse clientele |
553 |
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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 Oct 24, 2026.
More company lists in New Delhi
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The same list elsewhere in India
- Critical infrastructure operators in India 663
- Critical infrastructure operators in Maharashtra 208
- Critical infrastructure operators in Haryana 52
- Critical infrastructure operators in Tamil Nadu 48
- Critical infrastructure operators in Karnataka 45
- Critical infrastructure operators in Gujarat 37
- Critical infrastructure operators in Kerala 37
- Critical infrastructure operators in Uttar Pradesh 29
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