Stephen Buyer, a Republican representative from 1993 to 2011, was accused in court papers of engaging in insider trading during the $26.5 billion merger of T-Mobile and Sprint.

Co-Diagnostics, a company that has provided coronavirus tests to three state governments, has come under intense scrutiny for claims about its tests' accuracy and stock sales by company leaders.

Moderna is currently developing a promising, yet still unproven, vaccine against the coronavirus. But Moderna executives have already sold tens of millions of dollars worth of stock in the company.

Earlier this month, Jack Brewer, a former NFL player and a supporter of President Trump's reelection, was sued by the SEC. Now, he's set to speak at the Republican National Convention.