DLA Piper added four top 100 clients to its roster during the last quarter and rose from seventh place to first in the Aim 100 rankings.
It now numbers veterinary group CVS, technology company Datatec, China Central Properties, Hansteen Holdings, Invista Real Estate, soft drinks group Nichols and Goals Soccer Centres among its clients.
Offshore firm Cains was knocked off the top spot for the number of Aim 100 clients, dropping from first to third place and losing one of its six clients.
Pinsents kept its place at the top of the rankings for total number of Aim clients, despite losing four from its roster.
For the second successive quarter, the market value of Aim companies plummeted. LG, the top firm based on the market capitalisations of its clients, saw more than 35 per cent shaved off their combined market value.