Shares of Reliance Industries (RIL) made a lifetime high on Tuesday, surpassing their previous best made nearly 15 months ago. The stock of the oil-to-telecom giant rose nearly 1 per cent to end at Rs. 2,821, valuing the Mukesh Ambani-led firm at Rs. 19.1 trillion and cementing its place as the country’s most valuable company. RIL’s previous all-time high of Rs. 2,820 was registered on April 28, 2022. From the low of Rs. 2,201 earlier in 2023, the company’s stock has gained more than 28 per cent. The gains come ahead of a demerger with its financial services arm —