 CBS Money Watch. Stock trading was unaffected by the global IT outage sparked by a defective software update from cybersecurity specialist CrowdStrike. But a lot of big tech stocks continue to lose power as that high-flying sector was hit with a heavy round of profit-taking this week. CrowdStrike shares plunged on the IT outage, denting the momentum in what's been the hottest cybersecurity stock over the past year.