Tamtam Start free

The 90 largest critical infrastructure operators in New Delhi

Tamtam tracks 90 critical infrastructure operators headquartered in New Delhi. This list ranks all of them by number of employees on LinkedIn, led by Indian Oil Corp Limited, Indian Railways and NTPC Limited. Their median headcount is 1,272. Half of them were founded in 1998 or later.

馃嚠馃嚦 New Delhi90 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Indian Oil Corp Limitediocl.com

Leading energy company specializing in oil refining, distribution, and marketing, ranked among the world's largest corporations globally.

Oil and Gas 馃嚠馃嚦 New Delhi 41,695 1959
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

Truck Transportation 馃嚠馃嚦 New Delhi 33,129 n/a
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

Real Estate 馃嚠馃嚦 New Delhi 26,494 1975
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

Banking 馃嚠馃嚦 New Delhi 25,265 1894
5
GMR Groupgmrgroup.in

operates airports, generates energy, develops urban infrastructure, manages transportation, and owns sports teams, all while committing to community development.

Construction 馃嚠馃嚦 New Delhi 18,287 n/a
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.

Oil and Gas 馃嚠馃嚦 New Delhi 16,674 1956
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 13,180 2000
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

Government Administration 馃嚠馃嚦 New Delhi 11,065 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 9,381 1956
10
GAIL (India) Limitedgailonline.com

Largest natural gas company in India with operations in transmission, marketing, processing, LPG, petrochemicals, city gas, and exploration.

Oil and Gas 馃嚠馃嚦 New Delhi 9,153 1984
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

Insurance 馃嚠馃嚦 New Delhi 8,282 2008
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 7,845 1995
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

Financial Services 馃嚠馃嚦 New Delhi 7,183 1988
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

Utilities 馃嚠馃嚦 New Delhi 4,926 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 4,793 1956
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

Insurance 馃嚠馃嚦 New Delhi 4,283 1947
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

Financial Services 馃嚠馃嚦 New Delhi 3,746 1984
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

Utilities 馃嚠馃嚦 New Delhi 3,382 n/a
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

Oil and Gas 馃嚠馃嚦 New Delhi 3,040 n/a
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

Government Administration 馃嚠馃嚦 New Delhi 2,594 1854
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

Banking 馃嚠馃嚦 New Delhi 2,513 2016
22
National Informatics Centernic.gov.in

This Indian-based computer software company, focuses on providing information technology services

Software Development 馃嚠馃嚦 New Delhi 2,438 n/a
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

Utilities 馃嚠馃嚦 New Delhi 2,404 2002
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

Telecommunications 馃嚠馃嚦 New Delhi 2,336 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 2,280 1953
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

Utilities 馃嚠馃嚦 New Delhi 2,131 2002
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 2,116 n/a
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

Software Development 馃嚠馃嚦 New Delhi 2,064 2015
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 2,013 n/a
30
SAELsael.co

A leading Indian renewable energy company specializing in solar and waste-to-energy projects, promoting sustainable energy production and fighting climate change

Renewable Energy Power Generation 馃嚠馃嚦 New Delhi 1,911 1989
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

Oil and Gas 馃嚠馃嚦 New Delhi 1,869 1974
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

Financial Services 馃嚠馃嚦 New Delhi 1,809 2017
33
Tulip Telecomtulip.net

A leading provider of enterprise communications services with a global reach, offering network design, implementation, management, and value-added services

Telecommunications 馃嚠馃嚦 New Delhi 1,638 1992
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

Government Administration 馃嚠馃嚦 New Delhi 1,613 n/a
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

Aviation and Aerospace Component Manufacturing 馃嚠馃嚦 New Delhi 1,594 n/a
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 1,589 2003
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

Rail Transportation 馃嚠馃嚦 New Delhi 1,518 1952
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 1,477 n/a
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

Construction 馃嚠馃嚦 New Delhi 1,435 2003
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

Financial Services 馃嚠馃嚦 New Delhi 1,426 2016
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

Higher Education 馃嚠馃嚦 New Delhi 1,376 n/a
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

Broadcast Media Production and Distribution 馃嚠馃嚦 New Delhi 1,373 2007
43
THINK Gasthink-gas.com

An environmentally conscious company supplying clean fuel through City Gas Distribution in multiple districts across India for various sectors

Oil and Gas 馃嚠馃嚦 New Delhi 1,342 n/a
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

Funds and Trusts 馃嚠馃嚦 New Delhi 1,293 2020
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 1,272 1995
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

Oil and Gas 馃嚠馃嚦 New Delhi 1,201 1999
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

Rail Transportation 馃嚠馃嚦 New Delhi 1,187 n/a
48
Sitara (SEWA Grih Rin Limited)sgrlimited.in

Affordable housing finance provider based in New Delhi, India, operating under the brand name 'Sitara'

Financial Services 馃嚠馃嚦 New Delhi 1,094 2015
49
ONGC Videsh Ltdongcvidesh.com

Specializing in running exploration and production projects internationally, focusing on operations in the oil and gas industry

Oil and Gas 馃嚠馃嚦 New Delhi 1,073 1965
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 1,054 1981
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 1,028 1996
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 1,015 n/a
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

Rail Transportation 馃嚠馃嚦 New Delhi 1,000 2013
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

Financial Services 馃嚠馃嚦 New Delhi 961 2008
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

Government Administration 馃嚠馃嚦 New Delhi 953 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 941 2004
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

Government Administration 馃嚠馃嚦 New Delhi 901 1945
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

Banking 馃嚠馃嚦 New Delhi 872 n/a
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

Telecommunications 馃嚠馃嚦 New Delhi 864 2009
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

Oil and Gas 馃嚠馃嚦 New Delhi 851 1998
61
JIO FIBERjio.com

This company specializes in promoting businesses to help them succeed

Utilities 馃嚠馃嚦 New Delhi 848 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 841 n/a
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

Rail Transportation 馃嚠馃嚦 New Delhi 840 n/a
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

Utilities 馃嚠馃嚦 New Delhi 831 2002
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

Transportation, Logistics, Supply Chain and Storage 馃嚠馃嚦 New Delhi 824 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 812 1932
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 792 2017
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

Utilities 馃嚠馃嚦 New Delhi 778 2002
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

Rail Transportation 馃嚠馃嚦 New Delhi 757 2016
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

Civil Engineering 馃嚠馃嚦 New Delhi 746 2006
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 733 1985
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

Airlines and Aviation 馃嚠馃嚦 New Delhi 732 1999
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 727 1991
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 721 n/a
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

Transportation, Logistics, Supply Chain and Storage 馃嚠馃嚦 New Delhi 719 1988
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

Financial Services 馃嚠馃嚦 New Delhi 714 1986
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 708 1916
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 707 2009
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

Financial Services 馃嚠馃嚦 New Delhi 700 1992
80
Hindustan Powerhindustanpower.in

Company based in Delhi, India specializing in power projects

Electric Power Generation 馃嚠馃嚦 New Delhi 680 2008
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

Software Development 馃嚠馃嚦 New Delhi 678 1982
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

Truck Transportation 馃嚠馃嚦 New Delhi 666 2007
83
Delhi Transport Corporationdtc.delhi.gov.in

Government relations office based in New Delhi, India, serving the Delhi Transport Corporation

Government Relations Services 馃嚠馃嚦 New Delhi 659 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 649 n/a
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

Renewable Energy Power Generation 馃嚠馃嚦 New Delhi 630 2012
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 615 n/a
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

Transportation, Logistics, Supply Chain and Storage 馃嚠馃嚦 New Delhi 585 n/a
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

Transportation, Logistics, Supply Chain and Storage 馃嚠馃嚦 New Delhi 582 2006
89
Ministry of Railwaysindianrailways.gov.in

Official account representing Ministry of Railways, India, overseeing the country's railway infrastructure and services for efficient transportation

Transportation, Logistics, Supply Chain and Storage 馃嚠馃嚦 New Delhi 563 n/a
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

Hospitals and Health Care 馃嚠馃嚦 New Delhi 553 n/a

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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 Oct 24, 2026.

More company lists in New Delhi

The same list elsewhere in India