Updated from 9:01 a.m. EST

Federal investigators are examining


(EBAY) - Get Report

handling of possible illegal transactions, and a separate antitrust probe targets the company's efforts to license auction search engines, according to filings with the

Securities and Exchange Commission


The San Jose, Calif.- based online auction house also received a subpoena from the

Department of Justice's

antitrust division for documents related to an eBay unit,


, changes in commissions and agreements with other auction houses. eBay bought 134-year-old Butterfield & Butterfield, a privately held auction house, for $260 million last year in an effort to enter the auction market for costlier items. The company said the subpoena seeks documents dating back to 1992, adding that it believes the inquiry is part of a 3-year-old investigation into other auction houses.

"Even the process of providing records and information can be expensive, time consuming and result in a diversion of management attention," the company wrote in a Thursday filing.

In the filing, eBay also described requests for information it has received from other regulatory agencies, including the

New York Department of Consumer Affairs


Shares of eBay fell sharply on Friday following the disclosure of the investigations, trading down 22 5/8, or 11%, at 184 1/2 around midday. (eBay closed down 31, or 15%, at 176).