WASHINGTON — The Federal Trade Commission said on Tuesday that it had ordered Amazon, Apple, Facebook, Google’s parent company and Microsoft to turn over information about past acquisitions, broadening its review of the power of big tech companies.

The F.T.C. said it had requested information about hundreds of smaller deals made by the five tech companies over the past decade that weren’t required to be reported to regulators by law and could provide insights into antitrust abuses. Facebook, Google (whose parent company is Alphabet) and others have scooped up dozens of smaller tech firms over the years, many of them for less than $100 million.

“If during this study we see transactions that were problematic, all our options are on the table and it is conceivable we can initiate enforcement action with those deals,” Joseph J. Simons, the F.T.C. chairman, said in a call with reporters. He added that the orders for information were separate from the F.T.C.’s continuing antitrust investigations into big tech companies but could inform the inquiries.

The actions escalate the scrutiny in Washington of the nation’s largest technology companies. The Justice Department, Congress and state attorneys general are also examining whether Apple, Amazon and others acted in an anticompetitive manner in many different areas. Lawmakers have united around the issue, in a rare show of bipartisanship.