Laurence Blackall, a non-executive director of Oakley Capital Investments, a Bermuda-based investment firm, has purchased 200,000 ordinary shares at 118p a pop. The £236,000 purchase is currently the director's only holding in the firm, equal to around 0.2% of the total voting rights. At the end of December, the company's net asset value was £1.71 per share was up from £1.68 last year, an increase of 2.0%, achieved on the back of a year of significant progress. "The performance of the portfolio companies has been robust and is reflected in the continuing positive momentum of our NAV," the firm said earlier this year. "In the period, the Limited Partnership invested in three new portfolio businesses providing compelling growth opportunities for the future. We are continuing to see a good flow of prospects into our deal pipeline which we expect will provide a number of potential opportunities for the Limited Partnership in 2012."Top Director BuysOld Mutual (OML) Director name: Mr Reuel KhozaAmount purchased: 5,600 @ 1,359.69p Value: £76,143Oakley Capital Investments Ltd. (DI) (OCL) Director name: Mr Laurence BlackallAmount purchased: 200,000 @ 118.00p Value: £236,000Panmure Gordon & Co (PMR) Director name: Mr Anthony CannAmount purchased: 314,000 @ 9.50p Value: £29,830Workspace Group (WKP) Director name: Mr Graham ClemettAmount purchased: 13,198 @ 225.00p Value: £29,696North Atlantic Smaller Companies Inv Trust (NAS) Director name: Mr Christopher H B MillsAmount purchased: 2,897 @ 1,025.00p Value: £29,694Workspace Group (WKP) Director name: Mr Christopher PieroniAmount purchased: 12,949 @ 225.00p Value: £29,135Workspace Group (WKP) Director name: Mr Angus BoagAmount purchased: 12,949 @ 225.00p Value: £29,135Essar Energy (ESSR) Director name: Mr Philip AikenAmount purchased: 10,000 @ 115.92p Value: £11,592NR