According to Caixin, China's crackdown on illegal cross-border stock trading has led to the expansion of lawsuits over 'front-running' trades in U.S. stock options. Citadel Securities, the largest retail options market maker in the U.S., recently filed to join the related lawsuit in the Federal Court for the Southern District of New York as a plaintiff. The complaint states that Citadel Securities, as a market maker, was the counterparty to thousands of put option trades involving Futu Holdings (NASDAQ: FUTU) and Tiger Brokers (NASDAQ: TIGR). The traders involved allegedly purchased options before regulatory news was announced and profited after the news was disclosed. Citadel Securities, as the seller of the options, incurred losses in the opposite direction, amounting to approximately $28 million. https://(wublock123.com)/news/castle-securities-joins-lawsuit-over-futu-tiger-put-settlement-64216