The Chairman of Canada-based oil and gas group Bankers Petroleum has sold an additional 250,000 shares, the company announced on Friday, his latest in a series of large disposals over the last two weeks.Robert Cross sold the shares on June 19th at a price of 2.95 Canadian dollars per share (around 184p), raising a total of $737,500 (c£460,000).Including the sale of a further 500,000 shares through two transactions on June 17th and June 11th (at different prices), the Chairman has raised a total of C$2.16m (£1.34m).The stock is now currently at around the same level as it was at the start of 2013 - despite swinging between a 160-215p range - but still stands nearly 50% higher than where it was last June.Bankers last month revealed that oil revenue had jumped 29% in the first quarter to US$132.6m and net income had jumped 83% to $14.2m. Top Director BuysPublishing Technology (PTO) Director name: Mr Alan MougAmount purchased: 20,000 @ 255.00p Value: £51,000Vislink (VLK) Director name: Mr Ian DaviesAmount purchased: 100,000 @ 29.75p Value: £29,750Vislink (VLK) Director name: Mr John E HawkinsAmount purchased: 81,983 @ 30.25p Value: £24,800Corac Group (CRA) Director name: Mr Philip CartmellAmount purchased: 200,000 @ 11.75p Value: £23,500F&C Asset Management (FCAM) Director name: Mr Edward BramsonAmount purchased: 22,000 @ 95.26p Value: £20,957Top Director SellsBankers Petroleum Ltd.(CDI) (BNK) Director name: Mr Robert M D CrossAmount sold: 250,000 @ 185.48p Value: £463,700Invensys (ISYS) Director name: Mr Wayne EdmundsAmount sold: 71,048 @ 410.73p Value: £291,815Invensys (ISYS) Director name: Ms Victoria Hull Amount sold: 28,169 @ 410.73p Value: £115,699Invensys (ISYS) Director name: Mr David ThomasAmount sold: 22,219 @ 410.73p Value: £91,260