A few years back IB was on the wrong end of a stock manipulation in Singapore, and from memory first lost over 100mil usd (not sure how much they later recouped) It's possibly the case below, although this one dates from 2013, I thought it was more recent, but the legal case is still ongoing. https://www.moneyweb.co.za/investing/singapore-says-audacious-penny-stock-scheme-cheated-goldman/
The stock was YRIV. https://www.bloomberg.com/news/arti...-is-said-to-cost-interactive-brokers-millions