** Magellan Financial MFG.AX shares jump nearly 14% to A$11.005, their highest level since March 10, while the broader benchmark .AXJO trades down 0.7%

** Stock among top gainers on AXJO, headed for strongest trading session since early March

** Financial services provider confirms completion of acquisition with investment bank Barrenjoey Capital; Brian Benari named CEO

** Subject to shareholder approval, co will be named Barrenjoey Group, trade under ASX ticker BYJ

** Co in March said it will acquire Barrenjoey for A$1.62 billion ($1.12 billion); MFG jumped most in nearly two decades after announcement

** More than 1.1 million shares traded so far vs 30-day avg volume of around 760,000

** YTD, stock up 8.7% YTD vs flat AXJO

($1 = 1.4512 Australian dollars)