Anyone could have decided it would be a good idea to sell their stocks given the public knowledge about coronavirus.
February 13, 2020, - Burr sells significant portion of his holdings.
Throughout February and early March, the Administration was telling us that all is OK and not to worry!
see:
https://www.factcheck.org/2020/03/trumps-statements-about-the-coronavirus/Yet,Senators Burr, Feinstein, Inhofe and, Inhofe sold stock and saved themselves the pain of the crash. They ALL should be investigated and prosecuted.