In 2018, FINRA fined Interactive Brokers $5.5m for naked shorting.
https://www.finra.org/media-center/news-releases/2018/finra-fines-interactive-brokers-5-point-5-million-regulation-sho
In 2018, FINRA fined Interactive Brokers $5.5m for naked shorting. – chatter @ #wallstreetbets