[Citadel Intends to Intervene in Susquehanna Insider Trading Lawsuit] According to Bloomberg, market maker Citadel Securities is seeking to join the insider trading lawsuit filed in Pennsylvania against Susquehanna International Group (SIG) and its former traders, aiming to participate as a 'victim.' Citadel claims it suffered losses in related U.S. stock and options trades due to the alleged insider trading activities and hopes to gain approval from a New York court to intervene in order to protect its interests in subsequent claims. The case accuses former SIG employees of trading multiple stocks using non-public information for profit. Earlier reports indicated that the U.S. SEC is investigating allegations against market maker Susquehanna, involving insider trading of U.S. stock options related to Futu and Tiger.