This study attempts to discover the nexus between crude oil price fluctuation after heavy oil upgrading and stock returns of petroleum companies in the U.S. Stock Exchange for the years 2008 to 2018. One of the methods of upgrading heavy crude oil is to extract asphaltene from crude oil....

This research unearths the jolts in oil prices that has effect on the actual stock returns in Nigeria over 2001-2011 using multivariate regression models. Variables ranging from altering oil prices, changes in stock returns, changes in exchange rates and altering world market index were...