The Federal Trade Commission on Monday sued a Pikesville-based ticket reseller, alleging it illegally bought and marked up nearly 400,000 event tickets, including to concerts on Taylor Swift’s Eras Tour.

The FTC alleges that Key Investment Group, the company’s principals and related businesses used thousands of Ticketmaster accounts and credit card numbers, fake and proxy IP addresses, and other methods to buy at least 379,776 tickets in about a year.

It alleges that they bought $57 million worth of tickets in just over a year and sold “a portion” of them for $64 million, in violation of the Better Online Ticket Sales Act, or BOTS Act, which seeks to prevent resellers from using bots to circumvent ticket platforms’ security measures.

The trade regulator sued in Maryland U.S. Distri

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