Jio Platforms’ IPO grey market premium climbed to Rs 220 after the company filed its red herring prospectus (RHP) on Wednesday. The GMP implies a nearly 20% premium over the upper price band of Rs 1,119. The Rs 30,213 crore IPO, opening on October 21 and closing on October 23, is set to surpass Hyundai Motor India’s 2024 offering to become India’s largest-ever public issue.