(ShareCast News) - After a turbulent couple of weeks for Morrison, David Potts is putting his money where his mouth is.The chief executive has purchased £0.5m worth of shares in the supermarket - a total of 314,881 shares.It comes after a few grim announcements, including a 35% drop in first-half profit and Moody's downgrading its long-term debt rating.When the results were released, Potts said the immediate priority was to deliver a better shopping trip to stabilise trading performance."It will be a long journey. We approach the challenge with energy, confidence and many strengths, particularly our strong balance sheet and cash flow, which enables investment in improving the customer shopping trip."It also revealed which 11 stores will close, taking 900 jobs with them.Meanwhile K3 Business Technology chief executive David Bolton cashed up on a handful of shares after the company posted a 9% rise in pre-tax profit for the year to the end of June and announced a major contract win with a European mail order fashion retailer.He still owns a 3.04% stake in the company.Top Director BuysMorrison (Wm) Supermarkets (MRW) Director name: Mr David T PottsAmount purchased: 314,881 @ 158.79p Value: £500,000Marston's (MARS) Director name: Ms Carolyn Bradley Amount purchased: 25,000 @ 153.87p Value: £38,468Majestic Wine (MJW) Director name: Mr Philip WrigleyAmount purchased: 10,000 @ 381.50p Value: £38,150LightwaveRF (LWRF) Director name: Mr Barry GambleAmount purchased: 120,000 @ 28.00p Value: £33,600Rosslyn Data Technologies (RDT) Director name: Mr Hugh CoxAmount purchased: 65,000 @ 17.40p Value: £11,310Top Director SellsMulberry Group (MUL) Director name: Mr Roger T MatherAmount sold: 20,000 @ 900.00p Value: £180,000Mulberry Group (MUL) Director name: Mr Roger T MatherAmount sold: 13,000 @ 896.60p Value: £116,558K3 Business Technology Group (KBT) Director name: Mr David J BoltonAmount sold: 28,500 @ 295.00p Value: £84,075