Mark Wilson, the newly-appointed Chief Executive Officer of insurance giant Aviva, bought his first stake in the company on Tuesday, just days after the firm disappointed the City with its results for 2012.Wilson acquired 150,000 ordinary shares at 321.1113p each for a total of £481,667, his total holding since joining Aviva as frontman on January 1st.Shares have dropped around 10% in the past week after the firm reported that it would be slashing its dividend as it swung into the red in 2012 following a £3.3bn write-down on a disposal in the US.The insurer swung to a loss after tax of £3.05bn last year, compared with a profit of £60m the year before, after selling off its US operations in December to narrow its focus on lucrative businesses and markets. In the first major announcement since his appointment, Wilson said that the company's overall situation did not warrant bonuses for executive directors for 2012 or pay rises for 2013.Top Director BuysAviva (AV.) Director name: Mr Mark WilsonAmount purchased: 150,000 @ 321.11p Value: £481,665Soco International (SIA) Director name: Mr Robert CatheryAmount purchased: 50,000 @ 383.67p Value: £191,835SIG (SHI) Director name: Mr Stuart Mitchell Amount purchased: 110,000 @ 149.96p Value: £164,956Antofagasta (ANTO) Director name: Mr Ramon JaraAmount purchased: 4,000 @ 1,379.00p Value: £55,160Laird (LRD) Director name: Mr Anthony J ReadingAmount purchased: 10,000 @ 235.08p Value: £23,508Fusionex International (FXI) Director name: Mr Robin TaylorAmount purchased: 6,161 @ 242.00p Value: £14,910BT Group (BT.A) Director name: Mr Tony BallAmount purchased: 5,000 @ 268.69p Value: £13,434Top Director SellsPolar Capital Holdings (POLR) Director name: Mr B J D Ashford-RussellAmount sold: 1,000,000 @ 265.00p Value: £2,650,000Mondi (MNDI) Director name: Mr Peter OswaldAmount sold: 226,055 @ 883.62p Value: £1,997,467Hunting (HTG) Director name: Mr Dennis L ProctorAmount sold: 207,245 @ 936.50p Value: £1,940,849Rexam (REX) Director name: Mr Graham ChipchaseAmount sold: 253,354 @ 524.92p Value: £1,329,906Polar Capital Holdings (POLR) Director name: Mr Tim WoolleyAmount sold: 500,000 @ 265.00p Value: £1,325,000Mondi (MNDI) Director name: Mr Andrew KingAmount sold: 96,578 @ 883.62p Value: £853,383Rexam (REX) Director name: Mr David RobbieAmount sold: 153,889 @ 524.92p Value: £807,794Mondi (MNDI) Director name: Ms Carol HuntAmount sold: 37,434 @ 883.62p Value: £330,774Mandarin Oriental International (Singapore) (MDO) Director name: Mr Michael HobsonAmount sold: 121,000 @ $2.47 Value: $299,003Informa (INF) Director name: Mr Peter RigbyAmount sold: 34,783 @ 520.07p Value: £180,896BC