Jane Street Group is embroiled in a federal lawsuit alleging insider trading related to the collapse of TerraUSD (UST) in May 2022. According to newly unsealed court filings, the firm utilized confidential information from a former Terraform Labs intern, Bryce Pratt, who communicated via a private Telegram group. This insider knowledge allegedly enabled Jane Street to sell $192 million of UST just before its collapse, resulting in profits of about $134 million from short positions as Terra's $40 billion ecosystem unraveled. The lawsuit, initiated by the administrator of Terraform's bankruptcy estate, cites violations of federal securities laws and the Commodity Exchange Act, seeking to recover profits for creditors. Notably, a 2023 federal court ruling classified UST and Luna as securities, bolstering the lawsuit's claims. Jane Street denies the allegations, asserting they are unfounded and part of a broader attempt to extract money from the firm. The case also names co-founder Robert Granieri and trader Michael Huang, highlighting the serious legal implications for one of Wall Street's largest trading firms.