In the 1990s, Philadelphia law firms flooded into Delaware to capitalize on the Chapter 11 filing craze that hit Wilmington. While Philadelphia firms have had boots on the ground there for quite some time, most have not been able to expand their presence beyond small offices focused largely on bankruptcy and commercial litigation. Roughly 30 Philadelphia-based law firms -- including 18 of the 25 largest -- have Wilmington offices. Of those, the largest offices top out at about 20 lawyers. And only eight Philadelphia firms have 10 or more lawyers there. .