in reply to
Perl in large corporates - verifiable success stories?
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.
It helps to remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.