Exhibit 99.1

TATA MOTORS LIMITED

Bombay House

24, Homi Mody Street,

Mumbai 400 001, Maharashtra, India

Tata Motors registered domestic sales of 39,530 units in April 2021

Mumbai, May 1, 2021:Tata Motors Limited sales in the domestic & international market for April 2021 stood at 41,858 vehicles.

• Domestic Sales Performance:

Category	April 2021	March 2021	April 2020	% change (m-0-m)
Total Domestic Sales	39,530	66,609	NA	-41%

•Domestic - Commercial Vehicles:

Category	April 2021	March 2021	April 2020	% change (m-0-m)
M&HCV	4942	11030	NA	-55%
I & LCV	2013	6792	NA	-70%
Passenger Carriers	550	1880	NA	-71%
SCV cargo and pickup	6930	17253	NA	-60%
Total Domestic	14435	36955	NA	-61%
CV Exports	2209	3654	NA	-40%
Total CV	16644	40609	NA	-59%

•Domestic - Passenger Vehicles:

Category	April 2021	March 2021	April 2020	% change (m-0-m)
Total PV	25095	29654	NA	-15%

-Ends-

About Tata Motors

Tata Motors Limited (NYSE: TTM; BSE: 500570 and 570001; NSE: TATAMOTORS and TATAMTRDVR), a USD 35 billion organisation, is a leading global automobile manufacturer of cars, utility vehicles, pick-ups, trucks and buses. Part of the USD 113 billion Tata group, Tata Motors is India’s largest and the only OEM offering extensive range of integrated, smart and e-mobility solutions. It has operations in India, the UK, South Korea, Thailand, South Africa, and Indonesia through a strong global network of 103 subsidiaries, 10 associate companies, 3 joint ventures and 2 joint operations as on March 31, 2020.

With a focus on engineering and tech enabled automotive solutions catering to the future of mobility, Tata Motors is India’s market leader in commercial vehicles and amongst the top four in the passenger vehicles market. With ‘Connecting Aspirations’ at the core of its brand promise, the company’s innovation efforts are focused to develop pioneering technologies that are sustainable as

well as suited to evolving aspirations of the market and the customers. Tata Motors strives to bring new products that fire the imagination of GenNext customers, fueled by state of the art design and R&D centers located in India, UK, US, Italy and South Korea. Internationally, Tata commercial and passenger vehicles are marketed in countries, spread across Africa, the Middle East, South Asia, South East Asia, South America, Australia, CIS, and Russia.

To know more, please visit (www.tatamotors.com; also follow us on Twitter: https://twitter.com/TataMotors)

Media Contact Information:

Tata Motors Corporate Communications: +91 22-66657613 / indiacorpcomm@tatamotors.com

Safe Harbor: Statements included herein may constitute "forward-looking statements". Forward-looking statements are based on expectations, forecasts and assumptions by management and involve risks, uncertainties, and other factors that may cause our actual results, performance or achievements to materially differ from those stated. We cannot be certain that any expectation, forecast or assumption made by management in preparing these forward-looking statements will prove accurate, or that any projection will be realized. More detailed information about these and other factors that could affect future results is contained in our annual reports and filings with the Securities and Exchange Commission. Our forward-looking statements pertain to the date of their initial issuance, and we do not undertake to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.