Facebook Chief Executive Mark Zuckerberg walks past members of the news media as he enters the office of U.S. Senator Josh Hawley (R-MO) while meeting with lawmakers to discuss "future internet regulation on Capitol Hill in Washington, September 19, 2019.

Check out the companies making headlines in midday trading:

Facebook – Shares of the social media company fell 1.5% as the Department of Justice is reportedly planning to launch an anti-trust investigation into Facebook. This would be the fourth antitrust probe into Facebook, as the company is currently facing probes from the Federal Trade Commission, the House of Representatives Judiciary Committee, and a group of state attorneys general.