The figures were contained in federal lobbying disclosure reports filed with the Senate on Tuesday.

Tech's six most valuable publicly traded companies collectively spent more than $44 million on federal lobbying last year.

Cornerstone is a Washington lobbying giant whose clients have included Google Inc, Boeing Co and Exxon Mobil Corp, according to federal lobbying disclosures.

The automaker spent $7 million for federal lobbying last year, but Trillium was seeking more information about its support for trade organizations.

As threats of more federal regulation and potential antitrust action loom, tech firms like Google, Facebook, and Amazon have increased their federal lobbying spending.

The company has spent more than $28m on federal lobbying in 2017 and 2018, according to congressional filings.

Google spent $9.68 million and Microsoft Corp $7.34 million on federal lobbying in 2011, according to lobbying disclosure reports.

Google spent $9.68 million and Microsoft Corp MSFT.O $7.34 million on federal lobbying in 2011, according to lobbying disclosure reports.

Social networking giant Facebook spent $320,000 in federal lobbying during the quarter, compared with roughly $60,000 in the second quarter of 2010.

Last year Herbalife spent $2 million on federal lobbying while Ackman spent $264,000 on lobbyists to press his case against the company, government documents showed.