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use 5.14.2;
use warnings;
...
0028262,3777
0028262,3777
0028262,3777

var secid = [002826 0028262 0028262 0028262 0028262 0028262]
var Initial_shares = [3777 3777 3777 3777 3777 3777]

my %h;
my $aoa = csv (
...
    headers => "auto",
    filter  => { 1 => sub { for my $f (keys %_) { push @{$h{$f}}, $_{$
+f} }; 0 }},
    );

{   Initial_shares   => [
        3777,
...
        '0028262'
        ]
    }