In re January 2021 Short Squeeze Trading Litigation (Robinhood/Citadel Antitrust MDL)
2021–2024
After Robinhood halted buying of GameStop and other Reddit-driven meme stocks on Jan. 28, 2021, dozens of retail-investor suits were consolidated into an MDL; the antitrust theory was ultimately dismissed and affirmed on appeal in 2024.
What happened
On January 28, 2021, at the peak of the Reddit-fueled meme-stock surge, Robinhood and several other brokerages abruptly restricted buying of GameStop, AMC, and other heavily shorted stocks, allowing customers to sell but not open new positions. Retail investors filed dozens of lawsuits, which were consolidated as a multidistrict litigation, In re January 2021 Short Squeeze Trading Litigation, No. 1:21-md-02989, in the U.S. District Court for the Southern District of Florida.
The litigation proceeded on multiple tracks. An antitrust track alleged Robinhood and market-maker Citadel Securities had conspired to suppress meme-stock prices. The district court dismissed the antitrust claims, and on appeal the U.S. Court of Appeals for the Eleventh Circuit affirmed in 2024, holding that the investors' alleged losses were not 'anticompetitive effects' within the markets they pleaded. Other tracks raised negligence and fiduciary-duty theories tied to the trading halt.
The litigation is the most consequential courtroom aftermath of the Reddit short squeeze, testing — and largely rejecting — the popular theory among aggrieved retail traders that the buying halt was the product of an illegal agreement rather than collateral and liquidity pressures.
Impact
Closed the door on the leading antitrust theory that the meme-stock buying halt resulted from a Robinhood-Citadel conspiracy, and clarified the high bar retail investors face in converting trading-halt grievances into liability.