You are overwriting your hash every time through the while loop. Move the declaration of the hash outside of the loop:
my $csv = Text::CSV_XS->new();
open (FILE, "<", "$tickdir/$file") or die "Can't open CSV File:$!
+\n";
my %HOH;
while (<FILE>) {
$csv->parse($_);
my @columns = $csv->fields();
my $key = str2time($columns[1].' '.$columns[2]);
my (@prices, @volumes) = ();
$HOH{$key}{"name"} = $columns[0];
push(@{$HOH{$key}{"price"}}, $columns[3]);
push(@{$HOH{$key}{"volumes"}}, $columns[4]);
print Dumper(\%HOH);
}
close FILE;
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