Try this:

use strict;
use warnings;
use HTML::TableExtract;

#Get HTML file and set up headers for HTML::TableExtract
my $doc = 'nasdaq-stocks.txt';
my $html = do{ local $/=undef; open my $f,"<", $doc or die $!;<$f>};
my $headers = ['Symbol', 'Last Sale*', 'Change Net / %', 'Share Volume
+'];
#table 4 is advances.  Need to do again for 5 decliners
my $table_extract = HTML::TableExtract->new(count => 4, headers => $he
+aders);  

$table_extract->parse($html);

print join ("  \t",@$headers),"\n";

for my $r ($table_extract->rows()){
    my @cols = map {/([\w\.]+)\W+([\w\.\%]*)/} @$r;
    print  join ("\t",@cols), "\n";
}
[download]

It would take a little work to put the "$" back in front of the "Last Sale*" amount, but this should get you started.