Shares of The Trade Desk surged as much as 5.2% on Wednesday, with the catalyst being reports that 22 states joined the Federal Trade Commission (FTC) in filing a lawsuit against Amazon. The FTC alleges Amazon "secretly and systematically overcharged" advertisers by adding "undisclosed surcharges" and concealing the actual cost of its real-time ad auctions. Amazon called the lawsuit "misguided." The Trade Desk has long advocated for transparent pricing, and advertisers may shift ad dollars to independent players if they fear higher prices within "walled gardens."