Liontrust reported net outflows of 1.6 billion pounds ($1.80 billion) in the July-September quarter, while Man Group posted net outflows of $500 million, compared with a $900 million consensus forecast.
Quilter saw net inflows slow to 200 million pounds in the third quarter, compared with 1 billion pounds last year, while Rathbones' net inflows came in at 67 million pounds, following 1.43 billion pounds in outflows.
Shares of Man Group dropped 5.3%, while Quilter shares shed 5%.
Quilter's AUM at the quarter end was down by 1.8 billion pounds to 96.9 billion pounds.
Rathbones' AUM fell to 57.9 billion pounds from 58.9 billion pounds at June-end, while Liontrust's slipped to 31.7 billion pounds over the same period.