Tesla’s had a bumper year, finally making it onto the tech-focused S&P 500 index at the end of December after a string of profitable quarters. But despite the electric carmaker’s investor appeal, oil major ExxonMobil has been outperforming Tesla since August.

Exxon was demoted from the Dow Jones Industrial Average at the end of summer, several months before Tesla joined the S&P. However since that date, Exxon’s share price is up 51% compared to Tesla’s 42%.