Invesco Perpetual confirmed all three had left in order to pursue other opportunities.
The firm added it would be making a marketing appointment in January and a sales appointment at some point in the new year.
Until then Ian Trevers, head of distribution, would be covering for Newman, with the same sales team excepting Dale reporting to him.
Newman and Dale had worked at Invesco Perpetual for 17 years a piece, while White had worked there for nearly 13 years.
Prior to Invesco Perpetual he worked at Fidelity for six years as a marketing director and Aegon as a pensions manager.
