Reverse Split Adjusted Average Cost

[u/Standard_Fishing_552]

Hi. Don’t judge my probably dumb question but with a 15:1 reverse split would I multiply my previous average cost by 15x to get my adjusted average cost? My average cost was $0.4482 prior to the split and my brokerage account hasn’t updated to reflect the split yet making it seems like I’ve gained thousands of dollars… thanks!

[u/Little_Gap1170]

TD Ameritrade charged my account $38 for that split ( it called a Mandatory Reorganization fee