I would see if you can get any information from The Grant Street Group. They are always advertising on http://jobs.perl.org/ and appear to be a major player in the financial area.

From personal experience I can tell you that Rent.com is a major Perl shop, as is Hostgator, Bluehost and cPanel.

Update: I left Booking.com off the list of known major Perl players. I have not worked for them personally, but have seen their help-wanted ads and have heard from several colleagues that they, along with cPanel, are a major force behind the Houston PM group. Although not directly involved in the financial arena, you can bet that they are heavily involved with online transaction handling.