One could sit and read 10 pages of groveling for forgiveness but it still won't replace the paycheck that's going away. It would likely be about as effective as a spouse begging for forgiveness after getting caught in a multi-year affair.
The board and investors and remaining employees don't need an apology. They need better leadership, or they need performance management of the current leadership with actual consequences, as they would rightly expect for any other failing employee.