TalkTalk chief executive Didio Harding has stepped down after seven years in the job.
The boss will be replaced by current managing director Tristia Harrison, while longtime employee Charles Blingh will take up the role of chief operating officer. Both have been on the TalkTalk board since 2014.
The company has also announced that founder Charles Dunstone will become executive chairman of the company, after leaving his role as chairman of Dixons Carphone in May this year.
The end of Harding's TalkTalk tenure saw the brand's image hit hard by a cyber attack, in which hackers stole 15,600 bank account numbers and sort codes belonging to the telecom firm's customers.
Towards the end of last year the company unveiled a new brand positioning and claimed that despite the estimated £60m damage the hack caused, trust in the brand was higher than ever thanks to its community management team.
Harding is a member of the House of Lords, non-executive director of the Bank of England and a trustee of digital inclusion charity Doteveryone. She said she wants to focus on "more activities in public service," when she steps down in May.
"After seven extraordinary and fulfilling years, during which we have transformed TalkTalk's customer experience and laid the foundations for long term growth, I've decided it's time for me to start handing over the reins at TalkTalk and focus more on my activities in public service."
She continued: "I am very proud to be handing over to the next generation of TalkTalk leadership who, together with Charles, have played such an integral part in the success of the business to date."
TalkTalk unveiled its Q3 trading update today, revealing it had lost 42,00 broadband customers and 31,000 TV customers with revenues sliding from £459m to £435m year-on-year.