[5] In September 2021, TCS recorded a market capitalization of US$200 billion, making it the first Indian IT company to achieve this valuation.

In 1975, TCS implemented an electronic depository and trading system named SECOM for Swiss company SIS SegaInterSettle.

Anticipating the Y2K bug and the introduction of the unified European currency (Euro), Tata Consultancy Services developed a factory model for Y2K conversion.

The company also created software tools to automate the conversion process and facilitate implementation by third-party developers and clients.

[31] On the final trading day of 2011, it surpassed RIL to achieve the highest market capitalization of any India-based company.

[33] In May 2013, TCS was awarded a six-year contract valued at over ₹11 billion (US$130 million) to provide services to the Indian Department of Posts.

[43] On 25 January 2021, TCS briefly reclaimed the title of the world's most valuable IT company from Accenture with a market cap of $170 billion.

[45] In May 2021, TCS, in collaboration with its consortium partner Neurotechnology, was selected by the Unique Identification Authority of India (UIDAI) to provide biometric technology for the Aadhaar digital ID program.

[48] In 2021, TCS underwent a millennial rebranding, and the company updated its tagline from "Experience Certainty" to "Building on Belief".

[49] In 2021, Tata Consultancy Services was also one of the largest job providers in India, hiring 43,000 new employees in the first half of the fiscal year 2021–22.

[84] In India, TCS has multiple delivery centers in major cities, including Mumbai, Bangalore, Chennai, and Hyderabad.

[91] Since 2006, TCS has signed large contracts with American biopharmaceutical majors including Pfizer and Eli Lilly for providing clinical research-data management, biostatistics, and medical writing services.

[99] The research at TRDDC has also resulted in the development of Sujal, a low-cost water purifier, that can be manufactured using locally available resources.

TCS deployed thousands of these filters in the Indian Ocean tsunami disaster of 2004 as part of its relief activities.

[104] TCS' partners include Collabnet and Cassatt, and academic institutions such as IITs, Stanford, MIT, and Carnegie Mellon, and venture capitalists like Sequoia and Kleiner Perkins.

[129] On 14 February 2006, the US law firm Lieff Cabraser filed a nationwide class action lawsuit against TCS concerning payments to employees on deputation.

The workers alleged that they were compelled to forfeit their federal and state tax refunds to their employer and that their Indian salaries were wrongfully deducted from their US pay.

[139] The worker has also reported unexplained transfers[140] and other forms of alleged workplace retribution, including in performance reviews.