Ramon Borrell, the Research & Development (R&D) Director of FTSE 250 member Xaar, continued to build his stake in the inkjet printheads supplier with the purchase of 40,000 shares. The deal comes just days after the company lowered its guidance for full-year revenues and profit margin, saying the exceptional market for ceramic tile manufacturing had returned to more normal levels. It explained that sales volumes to the ceramic tile market had stabilised, in line with previous guidance, but that more aggressive pricing from competitors has led to average pricing falling, hitting margins.With R&D investment also increasing during the year, offset by beneficial capitalisation of its forthcoming Thin Film development costs, Xaar said adjusted operating profit margin would be 28%-29% versus the 30% reported last year.Borrell purchased the shares at 500.06p each for £200,024. Top Director BuysSinclair Is Pharma (SPH) Director name: Mr Robert Stuart SwansonAmount purchased: 900,000 @ 32.00p Value: £288,000Xaar (XAR) Director name: Mr Ramon BorrellAmount purchased: 40,000 @ 500.06p Value: £200,024Workspace Group (WKP) Director name: Mr Jamie HopkinsAmount purchased: 11,000 @ 573.00p Value: £63,030Workspace Group (WKP) Director name: Mr Graham ClemettAmount purchased: 6,875 @ 573.00p Value: £39,394Deltex Medical Group (DEMG) Director name: Mr Tim (Timothy) IrishAmount purchased: 300,000 @ 11.25p Value: £33,750Quindell (QPP) Director name: Mr Robert TerryAmount purchased: 16,667 @ 190.00p Value: £31,667UTV Media (UTV) Director name: Ms Helen KirkpatrickAmount purchased: 12,682 @ 210.00p Value: £26,632Deltex Medical Group (DEMG) Director name: Mr Tim (Timothy) IrishAmount purchased: 200,000 @ 10.75p Value: £21,500Sound Oil (SOU) Director name: Mr James ParsonsAmount purchased: 148,837 @ 10.75p Value: £16,000Burberry Group (BRBY) Director name: Mr Jeremy DarrochAmount purchased: 1,000 @ 1,460.00p Value: £14,600Top Director SellsMarston's (MARS) Director name: Mr Ralph Graham FindlayAmount sold: 97,345 @ 142.90p Value: £139,106Marston's (MARS) Director name: Mr Andrew AndreaAmount sold: 58,858 @ 142.90p Value: £84,108Amlin (AML) Director name: Mr Simon BealeAmount sold: 5,000 @ 472.70p Value: £23,635Marston's (MARS) Director name: Mr Ralph Graham FindlayAmount sold: 9,189 @ 144.30p Value: £13,260Marston's (MARS) Director name: Mr Andrew AndreaAmount sold: 9,189 @ 144.30p Value: £13,260Marston's (MARS) Director name: Mr Peter DalzellAmount sold: 9,189 @ 144.30p Value: £13,260Marston's (MARS) Director name: Mr Peter DalzellAmount sold: 8,551 @ 142.90p Value: £12,219NR