ThinkMarkets launches 24/7 pre-IPO markets on Anthropic and OpenAI

London, United Kingdom, October 28th, 2026, FinanceWire Traders can go long or short on the two AI companies as it breaks, including overnight and on weekends, before either company’s shares begin trading. ThinkMarkets has launched pre-IPO markets on Anthropic and OpenAI, allowing traders to take a long or short position on what each company will be worth at the end of its first day of trading. Both instruments are quoted 24 hours a day, seven days a week, so traders can respond to developments such as filing announcements, roadshow updates, and valuation reports whenever they emerge. The launch comes as both companies move towards public markets.

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