@ Superman,
Yeppers.
Robin

Success: Decimal Separater set to dot.
Results:
table_aapl.csv -4.8E+48
table_abbv.csv -9E+30 


Option Explicit

Sub SNB__KenH_SamT()
    Dim Filename As String
    Dim NameLength As Long
     
    Dim FileNameArray As Variant 'sn
    Dim FileLinesArray As Variant 'sp
     
    Dim Formula1LinesArray As Variant
    Dim Formula1Result As Double 'y
     'Repeat these two lies for each Formula. Edit the numbers to suit
    Dim Formula2LinesArray As Variant
    Dim Formula2Result As Double
     
    Dim Fn As Long 'Fn = Index number for FileNameArray                     'jj
    Dim Fl As Long 'Fl = FileLinesArray Index number                                    'j
     
    Const FolderPath As String = "C:\CSVs\" 'include ending \
     
     
     '''' Put all the file names in the path in Array
    FileNameArray = Filter(Split(CreateObject("wscript.shell").exec("cmd /c Dir " & _
    FolderPath & "*.csv /b /s").stdout.readall, vbCrLf), ".")
     
     
     '''' Open one file at a time
    With CreateObject("scripting.filesystemobject")
        For Fn = 0 To UBound(FileNameArray)
             
             
             ''''Put all lines from one file in Arrays
            FileLinesArray = Split(.opentextfile(FileNameArray(Fn)).readall, vbLf)
            Formula1LinesArray = FileLinesArray
            Formula2LinesArray = FileLinesArray
             'Initializ
            Formula1Result = 0
            Formula2Result = 0
             ''''Calcuate first result for one file
             
            For Fl = 0 To UBound(FileLinesArray) - 1
                 
                 '''' Calculate first formula
                 'Replace file line with Log of 6th value. Split(BlahBlah)(5)
                Formula1LinesArray(Fl) = Log(Split(Formula1LinesArray(Fl), ",")(5))
                 'After the first line
                If Fl > 0 Then Formula1Result = Formula1Result + Formula1Result + _
                (Formula1LinesArray(Fl) - Formula1LinesArray(Fl - 1) ^ 2) * 100
                 
                 '''' Calculate second Formula here
                 'Replace file line with first part of formula. Think carefully
                 'Formula2LinesArray (Fl) =  Your formula here
                 
            Next Fl
             
             '''' Put results in sheet
             
             'Get FileName
            NameLength = Len(FileNameArray(Fn)) - InStrRev(FileNameArray(Fn), "\")
            Filename = Right(FileNameArray(Fn), NameLength)
             
             'Place result
            With ActiveSheet.Rows(Fn + 1)
                .Columns(2) = Formula1Result 'Column B
                '.Columns(3) = Formula2Result
                .Columns(1) = Filename
            End With
             
             'Initialize Arrays
            FileLinesArray = ""
            Formula1LinesArray = FileLinesArray
            Formula2LinesArray = FileLinesArray
             
             
        Next Fn 'Work on next File
    End With
End Sub