A female banker whose boss demeaned her by repeatedly saying "not now, Stacey" has won a £4 million sex discrimination claim.
Stacey Macken alleged that over a four year period, while working at French bank BNP Paribas, she received hundreds of thousands of pounds less than her male peers and was subjected to sexist behaviour.
One boss, Denis Pihan, was accused of routinely belittling Miss Macken, 48, by replying "not now, Stacey" when she tried to talk to him.
Mr Pihan did it so frequently her colleagues began to make sarcastic comments about it, the tribunal heard.
On Tuesday, the tribunal ruled in her favour relating to claims of unequal pay, sex discrimination and victimisation. Her claims of harassment were dismissed.
The size of award Miss Mackey will receive has yet to be determined.
Miss Macken, who was previously a vice president at Deutsche Bank, was hired by BNP in Paribas in 2013.
She was paid £120,000 a year, but unbeknown to her, a male recruit hired with the same job title and responsibilities was being paid £160,000.
In her first four years her male peer was paid more than £167,000 in bonuses compared to the £33,000 she received, the tribunal heard.
When she complained, managers targeted her for further unfair treatment including leaving a witch’s hat on her desk.
The PA of one of her former bosses, Matthew Pinnock, said a group of male colleagues had pulled the prank after an afternoon drinking session in the pub.
Georgina Chapman told the tribunal: "In October 2013, a large Halloween-style black witch's hat was left on Stacey Macken's desk after some of the Prime Brokerage team, including Matthew Pinnock, had gone drinking at the pub towards the end of the day.”
When Miss Macken arrived for work the next day she was “visibly upset” by the hat and confided in Miss Chapman that she felt “really uncomfortable” working with the male colleagues in question.
After repeated internal complaints about her treatment Miss Macken finally took the bank to a tribunal in April this year, claiming more than £4 million in compensation and back pay.
BNP Paribas previously claimed they had hired her as a 'junior' and that her male colleague deserved his higher salary because he was her senior.
The bank declined to comment on the judgment of tribunal.
But the judgement ruled said Miss Macken, of Fulham, west London, had been the victim of unfair treatment because she was a woman.
"Leaving a witch's hat on a female employees desk, in a predominantly male working environment, was an inherently sexist act that potentially reflects on the nature of (the) working environment for the Claimant and the approach that was taken to women," the judgement reads.
The tribunal also condemned Mr Pihan's repeated use of the phrase "not now, Stacey" when talking to her.
"This was a demeaning comment that was made so regularly that it was a source of comment by the Claimant's colleagues.