Bronte Film and TV was established in 2012 as a vehicle through which to adapt Rowlings work.
She founded the company with her literary agent Neil Blair and is the majority shareholder.
Bronte Film and TVs revenue halved to 8.8M, according to a UK Companies House filing.
JK RowlingGetty
Its pre-tax profit fell 84% to 1.1M.
Bronte confirmed that it was adaptingThe Ink Black Heartfor theBBCafterDeadline revealed the plansearlier this month.
It said production will begin later this year, with a premiere set for 2024.
The BBC said the discussions, broadcast onRadio 4andBBC Radio Scotland, fell below rigorous editorial standards.
