Equifax Inc (NYSE:EFX) became the latest big name to report a cyber-security breach, sending its shares tumbling in after-hours trading.
The information solutions services provider said the attack may have affected some 143mln customers, accessing names and birth dates, Social Security numbers, addresses and driver's license details.
The firm said credit card numbers for around 209,000 consumers were also perused.
The shares were off 13% at US$124.05 in after-hours trading after the news broke.
The company has created a web site, www.equifaxsecurity2017.com, so its customers can check whether their information was accessed illegally.
Fiber optic networks specialist Finisar Corporation (NASDAQ:FNSR) tumbled 8.6% to US$20.11 after its fiscal first quarter figures failed to come up to snuff.
Net revenue in the three months to the end of July fell to US$341.81mln from US$357.63mln the year before.
“This decrease resulted primarily from a decline in telecom revenues as well as a decrease in 10G and below datacom transceivers,” said Jerry Rawls, chief executive officer of Finisar.
Adjusted net income declined to US$45.75mln from US$57.51mln.
There was better news from fellow tech firm, Cloudera Inc (NYSE@CLDR), which rose 4.7% to US$22.41 after its second quarter earnings topped estimates.
The software company posted a net loss of 48 cents a share, but this was more than half the US$1.07 per share loss in the same period of the year before.
Stripping out one-off items and stock-based freebies, the net loss of 17 cents a share was eight cents lighter than the market had feared.