Upcoming IPOs are those with confirmed bidding windows - these are IPOs that will be open for public subscription within the next 30 days. The RHP has been published, the price band is finalized, and all regulatory approvals are in place. Investors can start preparing their bids based on the issue size, price band, lot size, and company fundamentals. This is the prime time for retail and institutional investors to conduct final due diligence and decide on bid strategies. The subscription timeline typically spans 3 days (Monday-Wednesday or Tuesday-Thursday), after which bidding closes and allotment begins.