Mark Williamson, the Chief Financial Officer (CFO) of International Power, the FTSE 100 power generator, has sold over a million pounds worth of shares in the firm. The move means he no longer holds any shares in the company. Williamson, who has been CFO since 2003, sold 409,684 shares, which belonged to both him and his wife, at 344.50p each, for a total of just over £1.41m. Earlier this month the firm, which is 70% owned by French utility GDF SUEZ, reported a 3% increase in 2011 revenue and an 8% increase in underlying earnings before interest, tax, depreciation and amortisation (EBITDA). The group said free cash flow in the year was up 4% from 2010's levels at €2.69bn (2010: €2.59bn) and with restructuring costs stripped out was up 7.5%. The stock is up more than 3% over the past twelve months, equivalent to 11p. Top Director BuysEnvironmental Recycling Technologies (ENRT) Director name: Mr Kenneth Williams BrooksAmount purchased: 10,065,000 @ 2.02p Value: £203,313Character Group (CCT) Director name: Mr Kirankumar Premshand ShahAmount purchased: 100,000 @ 148.00p Value: £148,000TyraTech Inc. (Reg S) (TYR) Director name: Mr Alan ReadeAmount purchased: 1,993,960 @ 5.00p Value: £99,698TyraTech Inc. (Reg S) (TYR) Director name: Mr Barrington (Barry) Marshall RileyAmount purchased: 1,000,000 @ 5.00p Value: £50,000TyraTech Inc. (Reg S) (TYR) Director name: Mr James (Jim) HillsAmount purchased: 315,500 @ 5.00p Value: £15,775Kofax (KFX) Director name: Mr Wade W Loo Amount purchased: 5,000 @ 309.00p Value: £15,450Surface Transforms (SCE) Director name: Mr Richard Douglas Gledhill Amount purchased: 100,000 @ 11.00p Value: £11,000Absolute Return Trust Ltd. GBP Shares (ABR) Director name: Mr Graham HarrisonAmount purchased: 10,000 @ 109.00p Value: £10,900Top Director SellsBerkeley Group Holdings (The) (BKG) Director name: Mr Anthony W PidgleyAmount sold: 300,000 @ 1,360.00p Value: £4,080,000Berkeley Group Holdings (The) (BKG) Director name: Mr Robert C G PerrinsAmount sold: 200,000 @ 1,360.00p Value: £2,720,000International Power (IPR) Director name: Mr Mark WilliamsonAmount sold: 409,684 @ 344.50p Value: £1,411,361Character Group (CCT) Director name: Mr Kirankumar Premshand ShahAmount sold: 200,000 @ 148.00p Value: £296,000Travis Perkins (TPK) Director name: Mr Paul N Hampden SmithAmount sold: 21,803 @ 1,085.00p Value: £236,563Character Group (CCT) Director name: Mr Jonathan James DiverAmount sold: 20,000 @ 148.00p Value: £29,600SThree (STHR) Director name: Mr Gary EldenAmount sold: 4,312 @ 283.75p Value: £12,235