ReNew Energy Global plc

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2026 Commission File Number: 001-40752

RENEW ENERGY GLOBAL PLC (Translation of registrant's name into English)

C/O Vistra (UK) Ltd, Suite 3, 7th Floor 50, Broadway, London, England, SW1H 0DB, United Kingdom (Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐

Other events On October 22, 2026, ReNew Energy Global Plc ("ReNew") announced that it has signed binding agreements for sale of its controlling shareholding in the digital platform 3E, one of Europe's leading renewable energy asset performance management and analytics platforms. The transaction involves sale of ReNew's equity shareholding to Hg, a prominent London-headquartered private equity firm specializing in software and technology-enabled services buyouts across Europe and North America. The firm targets mission-critical enterprise software, workplace automation, and digital workflow businesses. This is a full exit from the investment made in 3E. This transaction is part of ReNew's capital recycling strategy and shall realize c. INR 8,000 Mn (c.US$ 84 Mn (1) ) cash on an investment of c. INR 4,675 Mn (c.US$ 56 Mn (2) ) through sale proceeds & redemption of shareholder loans.

(1) USD:INR exchange rate of INR 95.1 (2) Investment dates weighted average USD:INR exchange rate of INR 83.8

About ReNew ReNew is a leading decarbonization solutions company listed on Nasdaq (Nasdaq: RNW, RNWWW). ReNew's clean energy portfolio of ~20.5 GW (including 1.7 GW/6.2 GWh of BESS) on a gross basis as of August 18, 2026, is one of the largest globally. In addition to being a major independent power producer in India, we provide end-to-end solutions in a just and inclusive manner in the areas of clean energy, value-added energy offerings through digitalization, storage, and carbon markets that are increasingly integral to addressing climate change. In addition, ReNew has 6.4 GW of solar module and 2.5 GW of solar cell manufacturing capacities and is expanding its solar cells manufacturing capacity by another 4 GW, which is expected to be operational by December 2026. For more information, visit www.renew.com and follow us on LinkedIn, Facebook, X and Instagram.

Investor Enquiries Anunay Shahi ir@renew.com