In October 2016, TalkTalk was fined £400,000, the highest ever imposed by the Information Commissioner Office (ICO). This was really just the "tip of the iceberg."
Still today, TalkTalk revenues declined in the first quarter. Analysts attribute this in large measure to the breach the telco sustained in 2015.
TalkTalk has been battling to turn itself around after being rocked by a cyber attack in 2015, which saw the personal data of nearly 160,000 people accessed by hackers. It led to tens of thousands of customers deserting the firm and cost it £60 million. Shares slipped 1% after the first-quarter update.