Sub Sup()
Dim tablo, i&, x$
With ActiveSheet.UsedRange.Columns(1)
tablo = .Resize(, 2) 'matrice, plus rapide, au moins 2 éléments
For i = 1 To UBound(tablo)
x = tablo(i, 1) & "<"
tablo(i, 1) = Left(x, InStr(x, "<") - 1)
Next
.Value = tablo
End With
End Sub