The BlackRock UK Emerging Companies hedge fund has lifted its stake in Rathbones to beyond 3%.
This interest sits alongside the 1,276,046 contracts for difference (CFDS) the fund holds and increases the total position to 3.02%.
The move comes after a busy 2012 for Rathbones in which it made a number of acquisitions, starting with the purchase of London-based wealth manager RM Walkden & Co in April and concluding with the £10 million acquisition of Taylor Young Investment Management's wealth business in November.
To facilitate the Taylor Young deal Rathbones raised £24.7 million through a placing and intends to use a significant portion of these proceeds to fund further acquisitions.
Moving into the afternoon session shares in Rathbones were trading at £13.34, a gain of 7p on the day.