U.S. oil company stocks rallied sharply in overnight and early trading Sunday, fueled by President Donald Trump’s announcement that American firms will invest billions to revive Venezuela’s oil industry following the capture of former leader Nicolás Maduro.

Chevron Corp., the only major U.S. oil producer currently operating in Venezuela under a special license, led the gains with an increase of up to 11% in overnight trading, adding approximately $35 billion to its market capitalization. Other major energy firms saw similar boosts:

Valero Energy Corp.: +11%