what was the maximum percentage gain spy reached between september 2020 and september 2021

Between September 1, 2020 and September 30, 2021, Gladstone Investment (GAIN) returned 59.8% and SPY returned 24.8%.

DATEGladstone Investment
September 30 2021
$8.40
$404.50
September 29 2021
$8.45
$409.51
September 28 2021
$8.40
$408.82
September 27 2021
$8.53
$417.23
September 24 2021
$8.49
$418.43
September 23 2021
$8.57
$417.74
September 22 2021
$8.58
$412.72
September 21 2021
$8.51
$408.74
September 20 2021
$8.51
$409.12
September 17 2021
$8.60
$416.06
September 16 2021
$8.69
$420.15
September 15 2021
$8.75
$420.82
September 14 2021
$8.60
$417.33
September 13 2021
$8.64
$419.60
September 10 2021
$8.67
$418.53
September 09 2021
$8.76
$421.85
September 08 2021
$8.76
$423.67
September 07 2021
$8.80
$424.18
September 03 2021
$8.96
$425.71
September 02 2021
$8.99
$425.81
September 01 2021
$9.08
$424.50
August 31 2021
$9.01
$424.28
August 30 2021
$8.93
$424.91
August 27 2021
$8.93
$423.05
August 26 2021
$8.81
$419.30