22.1 Mio shares x 21.4$ = 500 Mio $ Market Cap,

once the media hype settles, and ZMapp and other large players get in,
the share price could easily drop once again to the range 9 to 15 $

For me, TKMR is meanwhile a high risk investment.
Many not taking profits now will loose money or intermediate gains.

See chart, the same happened at the beginning of the year.
Also the momentum is finished now.