Serco chief executive Christopher Hyman has bought shares and exercised options in the support services firm.Hyman purchased 38,303 ordinary shares at a price of 404.50p per share, which are to be held as Investment Shares under the terms of the company's deferred bonus plan.In addition, Hyman exercised nil cost options over 438,073 shares, granted to him under the Company's Long Term Incentive Schemes. He retained 105,000 shares, which have been transferred to Mrs Lianne Hyman. The balance of 333,073 shares was sold on market at a price of 400.75p per share, of which 207,031 were sold to settle Tax, NI and related costs.Following these transactions, Hyman's beneficial interest has increased to 320,413. "Mr Hyman has now also fully satisfied the Company's share ownership requirement of two times base salary," said the group.Top Director BuysSerco Group (SRP) Director name: Mr Christopher R HymanAmount purchased: 38,303 @ 404.50p Value: £154,936Shore Capital (SGR) Director name: Mr Alex AbadieAmount purchased: 100,000 @ 28.00p Value: £28,000StatPro Group (SOG) Director name: Mr Carl R BaconAmount purchased: 30,000 @ 76.40p Value: £22,920Top Director SellsSerco Group (SRP) Director name: Mr Christopher R HymanAmount sold: 207,031 @ 400.80p Value: £829,780Serco Group (SRP) Director name: Mr Christopher R HymanAmount sold: 126,042 @ 400.80p Value: £505,176Home Retail Group (HOME) Director name: Mr Terry DuddyAmount sold: 63,593 @ 272.00p Value: £172,973Vodafone Group (VOD) Director name: Mr Andrew HalfordAmount sold: 113,131 @ 113.80p Value: £128,743Home Retail Group (HOME) Director name: Mr Richard AshtonAmount sold: 29,678 @ 272.00p Value: £80,724Home Retail Group (HOME) Director name: Mr Terry DuddyAmount sold: 29,054 @ 272.00p Value: £79,027Vodafone Group (VOD) Director name: Mr Vittario ColaoAmount sold: 63,049 @ 113.80p Value: £71,750Vodafone Group (VOD) Director name: Mr Steve PuseyAmount sold: 38,449 @ 113.80p Value: £43,755