BT's wholesale boss is leaving after four years heading up the fixed and mobile network services wing of the telecom giant's biz.
Sally Davis, who has worked at the company since 1999, will leave BT at the end of October.
The telco said Davis had quit, citing "personal reasons".
"Sally has been a key member of our executive team and so I very much regret her departure," said BT CEO Ian Livingston.
"She has competing demands on her time however and so I fully respect her decision and would like to thank her for all she has done for BT."
BT has already found a replacement. Nigel Stagg will become the firm's wholesale chief on 1 September. He is currently managing director of BT Business.
"Stagg's task will be to build on the foundations laid by Davis and to ensure that the business – which had revenue last year of £4.2bn – continues to underpin and support the vibrant and competitive telecoms market in the UK," said the company in a statement.
BT's wholesale unit recorded a 5 per cent slide in sales in the company's first quarter results. It blamed "regulatory decisions" for hampering revenue in that wing of the business, which racked up £1bn during the three-month period ended 30 June.
Last month Ofcom ordered BT to slash its wholesale prices by 12 per cent below inflation per year for its broadband network. Prior to publishing its Q1 results, the company played down that regulatory cap as "non-material". Since then sales have fallen and Davis is now exiting the firm. ®