Vivergo Buy Out May 13, 2015 12:00 am Associated British Foods (ABF) has purchased BP’s stake in the Vivergo bioethanol operation on Humberside. ABF is taking on the oil company’s 47% share to bring its ownership in the venture up to 94%. The price has not been disclosed. DuPont is the other investor in the facility. In February, ABF made a £98m write-down in the book value of its Vivergo investment as a result of falling oil prices and currency movements.