Anthropic's move toward a historic US stock market listing has brought the initial public offering (IPO) process into focus, highlighting the regulatory reviews, investor marketing and pricing decisions companies must navigate before their shares begin trading.The IPO process typically takes three to six months from filing to market debut, depending on regulatory scrutiny, market conditions and investor demand.US MarketsPowered ByAs on 27 Oct 2026, 01:30 AM ISTS&P 500 Top GainersSynopsys454.33(5.62%)Akamai Technologies98.50(5.31%)Tesla391.62(5.21%)Lockheed Martin635.20(5.13%)Gainers»S&P 500 Top LosersFair Isaac708.07(-13.15%)Coterra Energy32.56(-8.62%)DoorDash168.44(-6.10%)Charter Communications102.18(-5.92%)Losers»Companies planning a US listing must complete several stages: preparing registration documents, disclosing financial information, marketing the offering, setting a price and allocating shares to investors.Read more: Who are the biggest investors backing Anthropic?