The two Canadian energy companies have been working on a revised bid since Friday , this person said, adding that talks were still ongoing. The value of the potential revised transaction couldn’t be learned. Suncor’s existing offer of 0.25 of a share for each share of Canadian Oil Sands is currently worth about 3.78 billion Canadian dollars ($2.59 billion). Canadian Oil Sands, the largest owner of the giant Syncrude oil-sands mining consortium in Alberta, has called Suncor’s existing all-stock offer too low. Suncor, which also owns a stake in Syncrude, has said its offer was fair, particularly since crude prices have been tumbling amid concerns about excess supply and slowing global demand. Nonetheless, Suncor has been under pressure to sweeten its bid after it earlier this month extended the deadline for acceptance of its bid . That was a sign it had failed to win sufficient support from Canadian […]