| Director/PDMR Shareholding | 14-Mar-2013 | 07:00 | RNS |
| Director/PDMR Shareholding | 18-Feb-2013 | 16:15 | RNS |
| Director/PDMR Shareholding | 15-Feb-2013 | 08:59 | RNS |
| Director/PDMR Shareholding | 13-Feb-2013 | 14:01 | RNS |
| Interim Management Statement | 12-Feb-2013 | 07:00 | RNS |
| Acquisition of Active Optical Technology | 15-Jan-2013 | 07:00 | RNS |
| Notification of IMS | 15-Jan-2013 | 07:00 | RNS |
| Trading Update and Board Appointments | 14-Dec-2012 | 07:00 | RNS |
| Directorate Changes | 10-Dec-2012 | 07:00 | RNS |
| TR-1: Notification of Major Interest in Shares | 05-Dec-2012 | 12:44 | RNS |
| Director PDMR Shareholding | 03-Dec-2012 | 09:19 | RNS |
| Full Year Earnings Expectation | 31-Oct-2012 | 16:55 | RNS |
| Half-year results | 31-Oct-2012 | 07:00 | RNS |
| Director PDMR Shareholding | 19-Sep-2012 | 08:50 | RNS |
| Trading Update | 18-Sep-2012 | 07:00 | RNS |