Autonomy's non-executive chairman Robert Webb has decided its time to dip in and pick up a stake in the data search software specialist.The shares have tumbled 23% since hitting 1,538p at the end of May, a level not seen since the tech bubble began to burst in 2000.Webb, who only took up his post in May, spent £99,254 on 8,109 shares at 1,224p each.He was appointed Queen's Counsel in 1988 then spent over 10 years as General Counsel at British Airways until leaving in March. Non-executive directorships at the London Stock Exchange and the BBC also keep him busy. Earlier this month Autonomy posted record second quarter revenue and profits. Revenues in the three months to 30 June rose to $195.2m from $125.7m a year earlier, while adjusted profit before tax, which excludes various charges, climbed to $89.6m from $50.8m. Four deals have been announced this month, two with global banks and the others with a leading global aerospace engineering supplier and a major US national law enforcement agency.Top Director BuysAutonomy Corporation (AU.) Director name: Mr Robert WebbAmount purchased: 8,109 @ 1,224.00p Value: £99,254London Stock Exchange Group (LSE) Director name: Mr Doug WebbAmount purchased: 14,160 @ 687.50p Value: £97,350Inchcape (INCH) Director name: Mr Nigel NorthridgeAmount purchased: 100,000 @ 27.50p Value: £27,500Land Securities Group (LAND) Director name: Mr Martin F GreensladeAmount purchased: 5,000 @ 511.90p Value: £25,595St James's Place (STJ) Director name: Mr Derek N D NethertonAmount purchased: 10,000 @ 181.30p Value: £18,130Top Director SellsHalfords Group (HFD) Director name: Mr Nick WhartonAmount sold: 43,827 @ 334.00p Value: £146,382St James's Place (STJ) Director name: Mr Mike WilsonAmount sold: 79,468 @ 178.70p Value: £142,009St James's Place (STJ) Director name: Mr David BellamyAmount sold: 44,503 @ 178.70p Value: £79,527St James's Place (STJ) Director name: Mr Ian GascoigneAmount sold: 44,503 @ 178.70p Value: £79,527St James's Place (STJ) Director name: Mr Andrew CroftAmount sold: 41,006 @ 178.70p Value: £73,278Halfords Group (HFD) Director name: Mr Paul McClenaghanAmount sold: 21,729 @ 334.00p Value: £72,575Travis Perkins (TPK) Director name: Mr John P CarterAmount sold: 9,225 @ 766.10p Value: £70,673Travis Perkins (TPK) Director name: Mr John P CarterAmount sold: 9,225 @ 765.00p Value: £70,571St James's Place (STJ) Director name: Mr David LambAmount sold: 14,305 @ 178.70p Value: £25,563