Marco Rubio picked up steam this week with a strong finish in Iowa. The U.S. senator from Florida will have a fresh pile of Wall Street cash at his disposal as he takes aim at the next voting states.

Billionaire hedge fund managers Paul Singer and Ken Griffin gave $2.5 million each to the Conservative Solutions PAC, an outside organization that supports Rubio, as 2015 drew to a close, according to Federal Election Commission data released this week. The noted Republican donors helped to make the securities and investment industry the top-contributing sector to pro-Rubio groups in 2015, with nearly $10 million in donations, according to the Center for Responsive Politics.