We now hold 18.12% of Afferro's voting rights and look forward to the completion of the acquisition following the relevant shareholder and regulatory approvals." Elsewhere, non-exec director David Mack has stepped down from the Silence Therapeutics ( LON:SLN ) board ahead of its AGM today. Cluff Natural Resources ( LON:CLNR ) said today that following share purchases yesterday and today non-exec director Earl De La Warr and finance chief Graham Swindells are now interested in 2.1% and 0.1% of the share capital respectively. Silence Therapeutics shares gained 2.21% today while Cluff Natural Resources added 2.44%.