The chairman of Waterman Group, an engineering and environmental consultancy, bought some shares in the company.Michael Baker, who joined the board in the beggining of the year, purchased 26,000 shares for 73.4p each, spending a total of £19,084 in the transaction.The group said last month it remains confident about its future, with revenue expected to continue to grow throughout 2015, particularly from retail and residential developments and in the highways infrastructure market in the UK.Top Director BuysStandard Chartered (STAN) Director name: Mr Andrew Nigel (Andy) HalfordAmount purchased: 58,876 @ 1,025.00p Value: £603,479Summit Therapeutics (SUMM) Director name: Ms Valerie Andrews Amount purchased: 10,500 @ 145.26p Value: £15,252Waterman Group (WTM) Director name: Mr Michael BakerAmount purchased: 26,000 @ 73.40p Value: £19,084DDD Group (DDD) Director name: Dr Sanji ArisawaAmount purchased: 500,000 @ 3.00p Value: £15,000Flowgroup (FLOW) Director name: Dr. Henry Joseph CialoneAmount purchased: 100,000 @ 14.20p Value: £14,200Top Director SellsThere were so sells today