The European Commission said the Silicon Valley companies violated the Digital Markets Act, a law meant to crimp the power of the largest tech firms.

BRUSSELS—The European Union fined Apple and Meta Platforms hundreds of millions of dollars and ordered the companies to comply with the bloc’s tech rules, a move that risks ratcheting up tensions with the Trump administration as EU officials pursue trade talks.

European Union watchdogs fined Apple and Meta hundreds of millions of euros as they stepped up enforcement of the 27-nation bloc’s digital competition rules.