Marjorie Scardino, Chief Executive of Financial Times publisher Pearson, has marked her fifteenth anniversary in the role with the purchase of 374 American Depository Receipts (ADRs).ADRs represent the ownership of shares in a non-US company. The purchase was made as part the firm's employee stock purchase plan, which gives employees the opportunity to purchase ordinary shares in Pearson at a discount.According to the stock exchange statement, Scardino paid $16.04 per share.Earlier this week analysts at broker Credit Suisse raised their price target on Pearson by 9% to 1,175p, saying the publisher remains their, "preferred long-term Professional Publisher for quality."The positive comments are partly the result of the fact Pearson shares, which are up 20% in the past year, are now trading at a 5% premium to the sector average, and at 14.2 times the estimated price-to-earnings multiple for 2012. Last month the group proposed the sale of its 50% stake in FTSE International for £450m, and proposed to acquire Global Education in China for $155m. Soon after Scardino, 64, sold a total of £572,752-worth of shares in the firm. Top Director BuysConygar Investment Company (CIC) Director name: Mr Robert T E WareAmount purchased: 500,000 @ 96.00p Value: £480,000Conygar Investment Company (CIC) Director name: Mr Peter A BatchelorAmount purchased: 240,000 @ 96.00p Value: £230,400Conygar Investment Company (CIC) Director name: Mr Preston Rabl Amount purchased: 140,000 @ 96.00p Value: £134,400Conygar Investment Company (CIC) Director name: Mr Steven Mark VaughanAmount purchased: 120,000 @ 96.00p Value: £115,200Renew Holdings (RNWH) Director name: Mr Brian MayAmount purchased: 100,000 @ 72.00p Value: £72,000Swallowfield (SWL) Director name: Mr Martin HagenAmount purchased: 18,500 @ 76.83p Value: £14,214Standard Life (SL.) Director name: Mr John PaynterAmount purchased: 7,985 @ 203.50p Value: £16,249Wessex Exploration (WSX) Director name: Mr David BramhillAmount purchased: 300,000 @ 5.15p Value: £15,450Anglo American (AAL) Director name: Dr Dr Mamphela RampheleAmount purchased: 598 @ 2,319.45p Value: £13,870Anglo American (AAL) Director name: Mr Phuthuma F. NhlekoAmount purchased: 597 @ 2,319.45p Value: £13,847Top Director SellsImagination Technologies Group (IMG) Director name: Mr Geoff S ShinglesAmount sold: 25,000 @ 565.73p Value: £141,432Betfair Group (BET) Director name: Mr Martin J. CruddaceAmount sold: 16,000 @ 813.00p Value: £130,080Imagination Technologies Group (IMG) Director name: Mr David Hurst-BrownAmount sold: 20,000 @ 572.75p Value: £114,550Betfair Group (BET) Director name: Mr Martin J. CruddaceAmount sold: 6,000 @ 812.50p Value: £48,750Betfair Group (BET) Director name: Mr Martin J. CruddaceAmount sold: 4,463 @ 812.50p Value: £36,262News Corp. 'A' Shares (NCRA) Director name: Mr Jose Maria AznarAmount sold: 1,164 @ $18.35 Value: $21,359News Corp. 'A' Shares (NCRA) Director name: Mr Sir Rod EddingtonAmount sold: 1,164 @ $18.35 Value: $21,359News Corp. 'A' Shares (NCRA) Director name: Mr Viet DinhAmount sold: 1,164 @ $18.35 Value: $21,359News Corp. 'A' Shares (NCRA) Director name: Mr Peter BarnesAmount sold: 1,164 @ $18.35 Value: $21,359News Corp. 'A' Shares (NCRA) Director name: Mr John L ThorntonAmount sold: 1,164 @ $18.35 Value: $21,359