A new study of Berkshire Hathaway, Warren Buffett's investment business, by a UK-based fintech company that analyses how artificial intelligence technology affects markets, has estimated that more than $10bn worth of the company’s holdings are potentially vulnerable to activity by short-selling hedge funds. Irithmics, which uses deep-learning AI to study market data and which supplies clients such as the London Stock Exchange with insights into market behaviour, will publish its analysis of Berkshire Hathaway’s public holdings later this year. It will highlight the investments that are at risk on account of hedge fund positions.