SEC Investigating Companies’ Handling of SolarWinds Attack (1)

The Securities and Exchange Commission is investigating how companies responded to last year’s SolarWinds Corp. hack, which rippled through computer systems across the U.S. government and corporate America.

The SEC is seeking to determine whether public-company victims made appropriate disclosures to investors, if there was suspicious trading related to the cyberattack and whether private data was compromised, said people with direct knowledge of the matter who asked not to be named because the probe is private.

The SEC sent letters last week to companies that it believes were impacted, asking that they provide details on how their businesses were harmed, ...