An "OFFER STOCK" usually refers to an Offer for Sale (OFS), where major shareholders (promoters) of an already listed company sell their existing shares to the public via the stock exchange, rather than the company issuing new shares (like in an IPO). It's a fast, transparent way for large investors to reduce their stake, meet regulatory minimums (like India's 25% public shareholding rule), and raise funds, with investors bidding for shares, often at a discount.