| 07/12/18 | 07:00:06 | 7 Dec 2018 | | Director/PDMR Shareholding | RNS |
| 07/12/18 | 07:00:03 | 7 Dec 2018 | | Notification of Trading Update | RNS |
| 05/12/18 | 07:46:39 | 5 Dec 2018 | | Holding(s) in Company | RNS |
| 11/10/18 | 17:42:20 | 11 Oct 2018 | | Director/PDMR Shareholding | RNS |
| 09/10/18 | 16:16:51 | 9 Oct 2018 | | Director/PDMR Shareholding | RNS |
| 19/09/18 | 17:22:28 | 19 Sept 2018 | | Holding(s) in Company | RNS |
| 19/09/18 | 08:00:05 | 19 Sept 2018 | | Appointment of Company Secretary | RNS |
| 18/09/18 | 17:04:13 | 18 Sept 2018 | | Holding(s) in Company | RNS |
| 13/09/18 | 16:34:06 | 13 Sept 2018 | | Holding(s) in Company | RNS |
| 11/09/18 | 08:00:05 | 11 Sept 2018 | | Interim Results | RNS |
| 06/09/18 | 15:31:09 | 6 Sept 2018 | | Holding(s) in Company | RNS |
| 04/09/18 | 16:13:34 | 4 Sept 2018 | | Holding(s) in Company | RNS |
| 29/08/18 | 18:03:55 | 29 Aug 2018 | | Holding(s) in Company | RNS |
| 13/08/18 | 12:17:15 | 13 Aug 2018 | | Director/PDMR Shareholding | RNS |
| 20/07/18 | 08:00:02 | 20 Jul 2018 | | Pre-close Trading Statement | RNS |
| 10/07/18 | 18:30:54 | 10 Jul 2018 | | Holding(s) in Company | RNS |
| 02/07/18 | 13:24:30 | 2 Jul 2018 | | Appointment of Company Secretary | RNS |
| 14/05/18 | 15:31:21 | 14 May 2018 | | Holding(s) in Company | RNS |
| 14/05/18 | 11:58:19 | 14 May 2018 | | Result of AGM | RNS |
| 14/05/18 | 08:00:06 | 14 May 2018 | | AGM Statement | RNS |
| 11/05/18 | 08:00:04 | 11 May 2018 | | Appointment of Group Finance Director | RNS |
| 16/04/18 | 15:45:23 | 16 Apr 2018 | | Posting of Annual Report and Notice of AGM | RNS |
| 13/04/18 | 16:26:16 | 13 Apr 2018 | | Director/PDMR Shareholding | RNS |
| 11/04/18 | 14:11:26 | 11 Apr 2018 | | Director/PDMR Shareholding | RNS |
| 13/03/18 | 12:13:13 | 13 Mar 2018 | | Final Results - Replacement | RNS |
| 13/03/18 | 07:00:03 | 13 Mar 2018 | | Final Results | RNS |
| 09/03/18 | 11:05:47 | 9 Mar 2018 | | Appointment of Non-Executive Director | RNS |
| 15/02/18 | 09:57:04 | 15 Feb 2018 | | Holding(s) in Company | RNS |
| 29/01/18 | 11:50:54 | 29 Jan 2018 | | Director/PDMR Shareholding | RNS |
| 17/01/18 | 07:00:04 | 17 Jan 2018 | | Pre-close Trading Statement | RNS |
| 05/01/18 | 15:48:34 | 5 Jan 2018 | | Holding(s) in Company | RNS |
| 01/12/17 | 07:00:06 | 1 Dec 2017 | | Acquisition of Sound Technology Limited | RNS |
| 20/11/17 | 16:51:25 | 20 Nov 2017 | | Holding(s) in Company | RNS |
| 30/10/17 | 16:42:12 | 30 Oct 2017 | | Holding(s) in Company | RNS |
| 11/10/17 | 08:00:02 | 11 Oct 2017 | | Capital Markets Day | RNS |
| 20/09/17 | 11:21:25 | 20 Sept 2017 | | Holding(s) in Company | RNS |
| 12/09/17 | 08:00:11 | 12 Sept 2017 | | Interim Results | RNS |
| 07/09/17 | 08:00:05 | 7 Sept 2017 | | Acquisition of Gebroeders van Domburg B.V. | RNS |
| 05/09/17 | 18:14:18 | 5 Sept 2017 | | Holding(s) in Company | RNS |
| 16/08/17 | 17:11:27 | 16 Aug 2017 | | Holding(s) in Company | RNS |
| 31/07/17 | 18:58:25 | 31 Jul 2017 | | Holding(s) in Company | RNS |
| 21/07/17 | 08:00:03 | 21 Jul 2017 | | Pre-close Trading Statement | RNS |
| 15/05/17 | 11:37:53 | 15 May 2017 | | Result of AGM | RNS |
| 15/05/17 | 08:00:09 | 15 May 2017 | | AGM Statement | RNS |
| 19/04/17 | 18:45:31 | 19 Apr 2017 | | Holding(s) in Company | RNS |
| 07/04/17 | 12:12:32 | 7 Apr 2017 | | Notification of Major Interest in Shares | RNS |
| 06/04/17 | 17:30:27 | 6 Apr 2017 | | Holding(s) in Company | RNS |
| 06/04/17 | 13:30:02 | 6 Apr 2017 | | Posting of Annual Report and Notice of AGM | RNS |
| 05/04/17 | 16:33:52 | 5 Apr 2017 | | Director/PDMR Shareholding | RNS |
| 31/03/17 | 14:28:25 | 31 Mar 2017 | | Completion of Acquisition of Earpro S.A. | RNS |
