Jenner & Block recorded a remarkable jump in revenue and profits in 2014, continuing the wild swings of the firm’s fortunes in recent years. The improved results were in part due to its work for General Motors Corp. investigating the carmaker’s ignition switch problem, which was led by Jenner chairman Anton Valukas. The firm’s ranks of partners and lawyers also took a dip during this time.

Gross revenue improved 14 percent, to $408 million, and revenue per lawyer rose 23 percent, to $1.015 million. Profits per partner soared 31 percent, from $1.235 million to $1.615 million. Average compensation for all partners rose 29 percent, to $1.11 million.