(ShareCast News) - Rolls-Royce shares have had a good run over the last fortnight, and now its directors are getting in on the action.Chairman Ian Davis, chief financial officer David Smith and non-executive director Lewis Booth have all significantly upped their stake in the company.Davis purchased the biggest chunk of shares, buying 15,000 for just over £0.11m. He now holds a 36,874 share stake in the company.It's the latest in a line of Rolls-Royce director buys, after the majority of directors bought relatively small packages of shares on Wednesday.The company is expected to release its third quarter interim management statement just over a month away on 12 November.Top Director BuysCentrica (CNA)Director name: Mr Iain C ConnAmount purchased: 100,000 @ 235.35pValue: £235,350 Rolls-Royce Holdings (RR.)Director name: Mr Ian DavisAmount purchased: 15,000 @ 739.50pValue: £110,925 Rolls-Royce Holdings (RR.)Director name: Mr Lewis BoothAmount purchased: 10,000 @ 734.00pValue: £73,400 Centrica (CNA)Director name: Mr Stephen PuseyAmount purchased: 20,000 @ 235.35pValue: £47,070 Rolls-Royce Holdings (RR.)Director name: Mr David SmithAmount purchased: 2,684 @ 739.50pValue: £19,848 At the time of publication, there were no director sells.