U.S. SEC probing SolarWinds clients over cyber breach disclosures -sources

FILE PHOTO: The seal of the U.S. Securities and Exchange Commission (SEC) is seen at their headquarters in Washington, D.C., U.S., May 12, 2021. REUTERS/Andrew Kelly

WASHINGTON (Reuters) -The U.S. Securities and Exchange Commission (SEC) has opened a probe into last year's SolarWinds cyber breach, focusing on whether some companies failed to disclose that they had been affected by the unprecedented hack, two persons familiar with the investigation said on Monday.

The SEC sent investigative letters late last week to a number of public issuers and investment firms seeking voluntary information on whether they had been victims of the hack and failed to disclose it, said the persons, speaking under the condition of anonymity to discuss confidential investigations.