(Sharecast News) - Derwent London director and head of regeneration Simon Silver offloaded 25,000 ordinary shares in the FTSE 250-listed property investor on Tuesday.Silver, who co-founded the firm's predecessor Derwent Valley Holdings, sold the shares at an average price of 3,257p each, for a total value of £814,250.Derwent unveiled an improvement in net asset value and full-year earnings back in February.Underlying earnings came to 99.1p a share, an increase of 5.1% on the previous year, while adjusted NAV came in at 3,776p, a 1.6% improvement after dividends.Group income, including net property income, was ahead 12.8% at £185.9m.As of 1615 GMT, Derwent shares had dipped 0.13% to 3,250p.Top Director BuysIndigoVision Group (IND)Director name: Mr Max Thowless-ReevesAmount purchased: 24,980 @ 135.00pValue: £33,723 Autins Group (AUTG)Director name: Mr Adam Richard AttwoodAmount purchased: 69,572 @ 27.00pValue: £18,784 Strategic Minerals (SML)Director name: Mr Jeffrey HarrisonAmount purchased: 812,500 @ 1.60pValue: £13,000 Top Director SellsDerwent London (DLN)Director name: Mr Simon P SilverAmount sold: 25,000 @ 3,257.00pValue: £814,250 Clearstar Inc. (DI) (CLSU)Director name: Mr Kenneth Wayne DawsonAmount sold: 188,000 @ 55.00pValue: £103,400 Elementis (ELM)Director name: Mr Paul WatermanAmount sold: 26,986 @ 154.05pValue: £41,572 International Personal Finance (IPF)Director name: Mr Justin LockwoodAmount sold: 5,587 @ 233.50pValue: £13,046