The two Southeast-founded firms followed a trend of most Am Law 100 firms making fewer promotions this year

Kirkland, Latham, Goodwin and Paul Weiss are among the fast growers as U.S.-based institutions continue their relentless assault on the U.K. capital.

Several industry observers have said that if McDermott or any other big firm actually makes good on its talk and welcomes PE investment, it's likely others will follow suit.

Gen Z attorneys appear to be staying at the firm they entered the industry with for longer than their predecessors at the tail-end of the Millennial generation.

"It goes without saying that making partner requires developing excellent technical skills, substantive expertise, sound judgment, and strong relationships with clients and colleagues. Beyond that, I'd encourage associates to be vocal about their goals. Seek regular feedback, and—awkward as it may feel—insist on clear communication from your practice group leaders about where you stand."