(Sharecast News) - Vianet revealed on Thursday that executive chairman James Dickson had acquired 25,000 ordinary shares in the London-listed monitoring systems and data management services provider.

Dickson, who took over as executive chairman in 2013, purchased the shares at an average price of 88.00p each, for a total value of £22,000.

Following the purchase, Dickson holds a beneficial interest in 352,192 ordinary Vianet shares, representing approximately 1.21% of the company's issued share capital.

As of 1630 GMT, Vianet shares were down 11.53% at 89.80p.

Reporting by Iain Gilbert at Sharecast.com

Top Director Buys

Fevertree Drinks (FEVR)

Director name: Havelock,Kevin

Amount purchased: 122,492 @ 771.00p

Value: £944,413.32

Fevertree Drinks (FEVR)

Director name: Branchflower ,Andrew

Amount purchased: 31,688 @ 785.00p

Value: £248,750.80

Fevertree Drinks (FEVR)

Director name: Lorenzo,Domenico De

Amount purchased: 8,872 @ 785.00p

Value: £69,645.20

Lsl Property Services (LSL)

Director name: Castleton ,Adam

Amount purchased: 8,725 @ 295.00p

Value: £25,738.75

Vianet Group (VNET)

Director name: Dickson,James

Amount purchased: 25,000 @ 88.00p

Value: £22,000.00

Ceres Power Holdings (CWR)

Director name: Paynter,Stuart

Amount purchased: 7,151 @ 138.97p

Value: £9,937.84

Ceres Power Holdings (CWR)

Director name: Paynter,Stuart

Amount purchased: 7,151 @ 138.97p

Value: £9,937.84

Marshalls (MSLH)

Director name: Murray,Vanda

Amount purchased: 4,000 @ 248.00p

Value: £9,920.00

Cambridge Nutritional Science (CNSL)

Director name: Rand,Carolyn

Amount purchased: 97,500 @ 3.67p

Value: £3,576.30

Top Director Sells

Staffline Group (STAF)

Director name: Spain,Thomas

Amount sold: 10,000 @ 22.50p

Value: £2,250.00