CrowdStrike shares close down 11.1% after a software update caused a major outage; its shares had previously risen nearly 118% in the last 12 months (Ryan Browne/CNBC)

Ryan Browne / CNBC:
CrowdStrike shares close down 11.1% after a software update caused a major outage; its shares had previously risen nearly 118% in the last 12 months  —  Cybersecurity firm CrowdStrike saw its shares plunge Friday, after an update led to a major outage, impacting businesses across the world.