(ShareCast News) - The trustees of the Ice Blue Directors Pension Scheme are slowly buying up shares in LXB Retail Properties.The scheme, of which LXB director John Irvine is a trustee and beneficiary, purchased over 31,400 shares in the company.It's the third purchase in three days, totalling 143,852 shares and brings the trust's total shareholding to 2,643,852 shares (1.44%).And Premier Oil's finance director Richard Rose is backing his company following a positive operational update on Wednesday. That brings his total stake to 33,226 shares. Top Director BuysLXB Retail Properties (LXB)Director name: Mr John Alastair IrvineAmount purchased: 31,492 @ 85.00pValue: £26,768 Regenersis (RGS)Director name: Dr Frank BlinAmount purchased: 15,337 @ 165.00pValue: £25,306 Rotork (ROR)Director name: Mr Jonathan DavisAmount purchased: 6,000 @ 169.40pValue: £10,164 Premier Oil (PMO)Director name: Mr Richard RoseAmount purchased: 15,000 @ 66.77pValue: £10,015No directors had sold shares at the time of publication.