(ShareCast News) - Braveheart Investment Group was forced to respond to a significant increase in its share price on Friday.The AIM-traded firm said one of its portfolio companies is in advanced negotiations to sell to a third party."If the transaction is completed, it would result in a significant profit to the group and a further announcement would be made at the time," Braveheart's board said in a statement."There can be no certainty that such transaction will be completed."