Shares in International Personal Finance (LON:IPF) slumped 14% after the Central European loan provider made its commercial chief redundant and warned on profits.
The stock tumbled 38.2p, or 14.4%, to 227p as IPF said David Broadbent "resigned from the board on Tuesday and would leave the company on March 7 "by reason of redundancy".
IPF, which focuses on people with poor credit histories or low incomes, said the redundancy had arisen following a review of the costs of the company's head office as part of a broader collective consultation.
Broadbent has been a director of IPF since July 2007, following the demerger from Provident Financial Group (LON:PFG) that he joined in August 1999.
Chief executive Gerard Ryan said: "Dave has given great service to the business in the last 16 years.
"I would like to thank him for everything that he has done in that time and wish him well."
In its annual results also out on Wednesday, IPF's pre-tax profits fell to £116.1mln from £123.5mln, although customer numbers rose 6.6% to 2,813 and issued credit lifted 13.2% to 1,043. It held its dividend at 7.8p a share.
The group warned that new legislation in Poland and Slovakia will hit its profitability "materially" in 2016 and beyond and it expected regulatory headwinds to continue.
Its European home credit businesses increased underlying profits in challenging trading, although profits in the Czech-Slovakia market declined.
In December, IPF stopped issuing new loans in Slovakia and has since decided to run off its agent-delivered home credit operation following the introduction of new rate-cap legislation.
However, a silver lining emerged in the form of its digital and Mexican businesses, which did well and are set to receive more investment.
Ryan said: "We achieved a robust financial performance in 2015, despite a number of significant regulatory matters."