Apple’s erstwhile sapphire supplier, GT Advanced Technologies, acknowledged Thursday that it is being investigated by the U.S. Securities and Exchange Commission (SEC).

In a filing with the SEC, GT said that the federal agency had contacted the company three weeks ago.

“On October 15, 2014, [the SEC] sent a letter to the Company noting that it was conducting an inquiry into matters involving the Company,” the filing stated. “The SEC is seeking certain information regarding trading activity in the Company’s securities, as well as the Company’s sapphire business and securities offering going back to January 1, 2013, and requesting the preservation and production of documents.”

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