Two directors at Great Portland Estates sold a combined £1.6m in stock, the property company said on Friday.After achieving performance targets set in the firm's long-term incentive plan in 2011, Chief Executive Toby Courtauld and Portfolio Director both sold over half of the shares that were awarded to them in order to meet the tax liabilities associated with the transaction.Courtauld was awarded 298,890 shares but sold 140.479 at a price of 651.8p each, raising £0.92m. This left him with around 1.34m shares, equal to a 0.39% holding.Thompson, meanwhile, received 237,893 but disposed of 111,810 at the same price, raising £0.73m. His resultant stake was 0.77m shares, equal to a 0.22% stake.The shares have risen by nearly 27% over the past 12 months, rising 12% in the year-to-date.Top Director BuysEcofin Water & Power Opportunities (ECWO) Director name: Mr Ian Christopher BarbyAmount purchased: 125,000 @ 158.00p Value: £197,500Barclays (BARC) Director name: Mr Crawford S GilliesAmount purchased: 40,000 @ 239.76p Value: £95,904Findel (FDL) Director name: Mr Eric TraceyAmount purchased: 24,700 @ 261.00p Value: £64,467Acal (ACL) Director name: Mr Graham WilliamsAmount purchased: 10,000 @ 350.00p Value: £35,000Acal (ACL) Director name: Mr Graham WilliamsAmount purchased: 8,250 @ 397.50p Value: £32,794Fenner (FENR) Director name: Mr Richard John PerryAmount purchased: 5,000 @ 340.25p Value: £17,012Henderson Diversified Income Ltd. (HDIV) Director name: Mr David SmithAmount purchased: 15,000 @ 92.75p Value: £13,912Top Director SellsGreat Portland Estates (GPOR) Director name: Mr Toby CourtauldAmount sold: 140,479 @ 651.80p Value: £915,642Great Portland Estates (GPOR) Director name: Mr Neil ThompsonAmount sold: 111,810 @ 651.80p Value: £728,778William Hill (WMH) Director name: Mr Neil CooperAmount sold: 205,773 @ 344.20p Value: £708,271William Hill (WMH) Director name: Mr Neil CooperAmount sold: 109,997 @ 344.90p Value: £379,380Findel (FDL) Director name: Mr Philip MaudsleyAmount sold: 75,000 @ 261.00p Value: £195,750Intertek Group (ITRK) Director name: Mr Lloyd PitchfordAmount sold: 5,601 @ 2,861.44p Value: £160,269Cable & Wireless Communications (CWC) Director name: Mr Nick CooperAmount sold: 181,685 @ 51.44p Value: £93,459Findel (FDL) Director name: Ms Laurel Powers-FreelingAmount sold: 14,654 @ 261.00p Value: £38,247Private Equity Investor (PEQ) Director name: Mr Charles Julian CazaletAmount sold: 14,561 @ 218.55p Value: £31,823Private Equity Investor (PEQ) Director name: Mr Charles Julian CazaletAmount sold: 9,651 @ 218.55p Value: £21,092BC