Profits per equity partner dropped 3 percent at Sonnenschein Nath & Rosenthal in 2009, according to figures reported by the firm late Thursday, and gross revenue was flat. PPP fell from $804,000 in 2008 to $780,000 last year. Gross revenue slipped from $473 million in 2008 to $472.5 million, according to the firm.

“[The] bottom line for us is that we are very pleased with the performance in view of the substantial investment we made in January of 2009 to add 100 new lawyers from Thacher Proffitt,” Sonnenschein chair Elliott Portnoy said via e-mail Thursday. Portnoy was traveling and unavailable for a phone interview.