"A small number of dominant, unregulated platforms have extraordinary power over commerce, communication, and information online," the panel said in a statement that did not name any companies.

Separately, the Federal Trade Commission and the Justice Department are gearing up to investigate the market power of Amazon, Apple, Facebook and Alphabet's Google, sources told Reuters on Monday.

(Reporting by Eric Beech; Editing by Tim Ahmann)

Stocks treated in this article : Apple, Facebook, Amazon.com, Alphabet