New Sainsbury's chairman David Tyler wasted no time in opening his account, snapping up £167,000 of shares in the supermarket chain today.The former finance boss of GUS, who joins the board at the start of next month and becomes chairman on 1 November, paid 334.3p each for 50,000 shares.Tyler takes over from Sir Philip Hampton who is leaving the food retailer following his appointment as chairman of government-owned lender, Royal Bank of Scotland. The 56-year-old, also chairman of IT contracting firm Logica, will be paid £450,000 a year for working two to three days a week. In a former life he was finance director at auctioneer Christie's.Top Director BuysSmith & Nephew (SN.) Director name: Mr Joseph C. PapaAmount purchased: 5,000 @ 567.38p Value: £28,369SVM Global Fund (SVG) Director name: Mr Senator Shane P N RossAmount purchased: 8,441 @ 265.00p Value: £22,369Top Director SellsGuinness Peat Group (GPG) Director name: Dr Gary WeissAmount sold: 3,000,000 @ 35.50p Value: £1,065,000Guinness Peat Group (GPG) Director name: Mr B A NixonAmount sold: 2,250,000 @ 35.50p Value: £798,750Jardine Matheson (Singapore) (JAR) Director name: Mr Adam Phillip Charles KeswickAmount sold: 10,000 @ $31.00 Value: $310,010Jardine Matheson (Singapore) (JAR) Director name: Mr Benjamin William KeswickAmount sold: 10,000 @ $31.00 Value: $310,010Jardine Matheson (Singapore) (JAR) Director name: Mr Simon L KeswickAmount sold: 10,000 @ $31.00 Value: $310,010Jardine Matheson (Singapore) (JAR) Director name: Mr E P K WeatherallAmount sold: 10,000 @ $31.00 Value: $310,010Caledonia Investments (CLDN) Director name: Mr Jamie M B Cayzer-ColvinAmount sold: 16,653 @ 1,681.00p Value: £279,937Signet Jewelers (SIG) Director name: Mr Thomas PlaskettAmount sold: 1,995 @ 1,612.76p Value: £32,175