Non-executive director Judith Sprieser has invested £101,000 in credit checking firm Experian. Sprieser, who was appointed to the board in June, bought 13,590 shares at 746.25p each. Sprieser is a former boss of technology software company Transora and prior to that finance director of Sara Lee. She is a non-executive director of Reckitt Benckiser. Last week, Experian said that there were improving trends across all regions in the first half of its financial year.Revenue from continuing activities in the six months to September 2010 was up 8% at constant exchange rates, while organic revenue growth was 7%. Similar growth rates are expected for the year as a whole and Experian hopes to edge up its operating margin. Total group revenue improved to $2bn from $1.9bn the year before. Profit before tax fell to $283m from $316m, while earnings before interest and tax (EBIT) rose 10% to $484m. The interim dividend has been hiked 29% to $0.09 a share. The shares go ex-dividend on 29 December and the payment date is 28 January so Sprieser will receive a dividend of $1,223 (£776). Top Director BuysExperian (EXPN) Director name: Mr Judith SprieserAmount purchased: 13,590 @ 746.25p Value: £101,415Ondine Biomedical Inc. (OBP) Director name: Dr Merrill BielAmount purchased: 55,935 @ 37.67p Value: £21,071Ondine Biomedical Inc. (OBP) Director name: Dr Merrill BielAmount purchased: 32,629 @ 37.67p Value: £12,291IS Solutions (ISL) Director name: Mr Peter EnglishAmount purchased: 46,500 @ 36.00p Value: £16,740Top Director SellsAssociated British Foods (ABF) Director name: Mr George G WestonAmount sold: 52,529 @ 1,070.00p Value: £562,060Associated British Foods (ABF) Director name: Mr John BasonAmount sold: 36,351 @ 1,070.00p Value: £388,956Sandvine Corp. (SAND) Director name: Mr Scott HamiltonAmount sold: 22,100 @ 143.29p Value: £31,667Sandvine Corp. (SAND) Director name: Mr Dave CaputoAmount sold: 15,000 @ 142.02p Value: £21,303