Two directors at FTSE 100 peers GKN and Experian have sold large stakes in each company, the firms announced on Monday.Andrew Reynolds Smith, the head of GKN's Automotive and Powder Metallurgy division, exercised options over a total of 974,344 shares on Friday and subsequently sold 626,973 of them to cover option cost and tax liabilities. The sale, priced at 350.08p a share, was valued at over £2.19m. The remaining shares increased Smith's holding to 691,010, equal to a 0.042% stake in the engineering company.Meanwhile, Experian's Chief Executive Don Robert trimmed his interest in the information services giant by 100,000 shares on Friday.The disposal was at a price of 1,218.284p a share, making just under £1.22m for the company frontman.Top Director BuysAnglogold Ashanti Ltd. (AGD) Director name: Mr S (Venkat) VenkatakrishnanAmount purchased: 12,500 @ 845.06p Value: £105,632Symphony International Holdings Ltd. (SIHL) Director name: Mr Anil ThadaniAmount purchased: 300,000 @ $0.74 Value: $223,140Symphony International Holdings Ltd. (SIHL) Director name: Mr Anil ThadaniAmount purchased: 183,281 @ $0.75 Value: $137,461DCC (DCC) Director name: Miss Jane Lodge Amount purchased: 3,000 @ 2,680.00p Value: £80,400Bank of Ireland (Governor & Company of the) (BKIR) Director name: Mr Bradley MartinAmount purchased: 100,000 @ € 0.21 Value: € 20,850Top Director SellsGKN (GKN) Director name: Mr Andrew Reynolds SmithAmount sold: 626,973 @ 350.08p Value: £2,194,907Experian (EXPN) Director name: Mr Don RobertAmount sold: 100,000 @ 1,218.28p Value: £1,218,280BC