The executive committee of the board of Tata Steel in its meeting approved "simultaneous but unlinked issues" of ordinary shares having face value of Rs 10 each.
The issue will comprise "up to 15.53 crore fully paid up ordinary share not exceeding Rs 8,000 crore" and "7.76 crore fully paid up ordinary share not exceeding Rs 4,800 crore."
The letter of offer will be filed with BSE and NSE, and will be submitted to the market regulator Sebi, the company informed.
"The Board approved issuance of equity and equity linked instruments, including ordinary shares of the company by way of a rights issue to existing shareholders on record date for an amount not exceeding Rs 12,800 crore...," Tata Steel had said in a statement earlier.