Staffing company Work Group on Monday announced its Chief Executive, Rose Colledge, had enlarged her stake in the firm with the purchase of 284,844 shares, while her husband bought a further 441,014. All of the shares were bought for 4.53p each, giving a total trade value of £32,881. Colledge's stake in the company increased to 1.6m, equal to 5.6% of the issued share capital. Towards the end of last month the director acquired another 373,677 shares, which was announced as the group's Chairman grew his own stake by 2.47m shares, almost doubling his holding in the AIM-listed firm.The transactions appeared to prompt a strong rise in the company's share price, which rose from 5.75p to 8.50p over the course of a week following the deals.Top Director BuysChurchill Mining (CHL) Director name: Mr David QuinlivanAmount purchased: 89,969 @ 22.23p Value: £20,000Work Group (WORK) Director name: Mrs Rose ColledgeAmount purchased: 441,014 @ 4.53p Value: £19,978Churchill Mining (CHL) Director name: Mr Gregory RadkeAmount purchased: 67,476 @ 22.23p Value: £15,000Churchill Mining (CHL) Director name: Ms Fara LuwiaAmount purchased: 67,476 @ 22.23p Value: £15,000Churchill Mining (CHL) Director name: Mr Rachmat GobelAmount purchased: 67,476 @ 22.23p Value: £15,000Churchill Mining (CHL) Director name: Mr John NagulendranAmount purchased: 67,476 @ 22.23p Value: £15,000Work Group (WORK) Director name: Mrs Rose ColledgeAmount purchased: 284,844 @ 4.53p Value: £12,903Top Director SellsPacific Alliance Asia Opportunity Fund Ltd (PAX) Director name: Mr Christopher M GradelAmount sold: 494,551 @ $1.57 Value: $776,445Medgenics Inc. (Reg S) (MEDG) Director name: Mr Stephen D McMurrayAmount sold: 45,534 @ 397.59p Value: £181,039Medgenics Inc. (Reg S) (MEDG) Director name: Mr Andrew L PearlmanAmount sold: 34,466 @ 405.92p Value: £139,904NR