| 06/04/18 | 17:40:55 | 6 Apr 2018 | | Second Price Monitoring Extn | RNS |
| 06/04/18 | 17:35:26 | 6 Apr 2018 | | Price Monitoring Extension | RNS |
| 19/03/18 | 18:16:19 | 19 Mar 2018 | | Director's Shareholding | RNS |
| 01/03/18 | 07:00:07 | 1 Mar 2018 | | Acquisition of Keystone Filter | RNS |
| 14/02/18 | 12:07:40 | 14 Feb 2018 | | Second Price Monitoring Extn | RNS |
| 14/02/18 | 12:02:36 | 14 Feb 2018 | | Price Monitoring Extension | RNS |
| 13/02/18 | 16:40:49 | 13 Feb 2018 | | Second Price Monitoring Extn | RNS |
| 13/02/18 | 16:35:38 | 13 Feb 2018 | | Price Monitoring Extension | RNS |
| 01/02/18 | 17:57:39 | 1 Feb 2018 | | Block listing Interim Review | RNS |
| 29/01/18 | 07:00:04 | 29 Jan 2018 | | Results for the year ended 30 November 2017 | RNS |
| 02/01/18 | 10:35:47 | 2 Jan 2018 | | Holding(s) in Company | RNS |
| 12/12/17 | 16:52:33 | 12 Dec 2017 | | Holding(s) in Company | RNS |
| 08/12/17 | 07:00:03 | 8 Dec 2017 | | Pre-close Trading Update and Acquisition | RNS |
| 06/11/17 | 16:40:16 | 6 Nov 2017 | | Second Price Monitoring Extn | RNS |
| 06/11/17 | 16:35:09 | 6 Nov 2017 | | Price Monitoring Extension | RNS |
| 18/10/17 | 17:35:11 | 18 Oct 2017 | | Price Monitoring Extension | RNS |
| 13/10/17 | 11:00:01 | 13 Oct 2017 | | Director's Shareholding and Issue of Equity | RNS |
| 03/10/17 | 17:35:20 | 3 Oct 2017 | | Price Monitoring Extension | RNS |
| 28/09/17 | 08:00:07 | 28 Sept 2017 | | Appointment of an Independent NED | RNS |
| 19/09/17 | 08:00:03 | 19 Sept 2017 | | Trading Update | RNS |
| 17/08/17 | 12:34:03 | 17 Aug 2017 | | Holding(s) in Company | RNS |
| 28/06/17 | 13:32:50 | 28 Jun 2017 | | Director's Shareholding and Issue of Equity | RNS |
| 27/06/17 | 08:00:02 | 27 Jun 2017 | | Half Yearly Results | RNS |
| 22/06/17 | 11:00:01 | 22 Jun 2017 | | Additional Listing | RNS |
| 05/06/17 | 08:00:02 | 5 Jun 2017 | | Trading Update | RNS |
| 11/04/17 | 12:50:02 | 11 Apr 2017 | | AGM resolutions | RNS |
| 11/04/17 | 08:00:14 | 11 Apr 2017 | | AGM Statement and Trading Update | RNS |
| 10/04/17 | 17:51:13 | 10 Apr 2017 | | Holding(s) in Company | RNS |
| 05/04/17 | 08:00:07 | 5 Apr 2017 | | Acquisition | RNS |
| 24/03/17 | 08:00:05 | 24 Mar 2017 | | Director's Shareholding and Issue of Equity | RNS |
| 10/03/17 | 12:05:05 | 10 Mar 2017 | | Posting of Accounts, AGM and Change of Auditor | RNS |
| 22/02/17 | 10:33:40 | 22 Feb 2017 | | Holding(s) in Company | RNS |
| 06/12/16 | 07:00:06 | 6 Dec 2016 | | Trading Update and Directorate Change | RNS |
| 30/11/16 | 08:21:24 | 30 Nov 2016 | | Director's shareholding and changes in equity | RNS |
| 14/11/16 | 10:28:08 | 14 Nov 2016 | | Dr Krishnamurthy Rajagopal | RNS |
| 10/11/16 | 17:09:00 | 10 Nov 2016 | | Holding(s) in Company | RNS |
| 03/10/16 | 17:06:18 | 3 Oct 2016 | | Holding(s) in Company | RNS |
| 03/10/16 | 17:04:51 | 3 Oct 2016 | | Holding(s) in Company | RNS |
| 03/10/16 | 11:29:14 | 3 Oct 2016 | | Holding(s) in Company | RNS |
| 21/09/16 | 13:07:34 | 21 Sept 2016 | | Second Price Monitoring Extn | RNS |
| 21/09/16 | 13:02:18 | 21 Sept 2016 | | Price Monitoring Extension | RNS |
| 21/09/16 | 10:28:28 | 21 Sept 2016 | | Holding(s) in Company | RNS |
| 21/09/16 | 08:00:07 | 21 Sept 2016 | | Trading update & appointment of an Independent NED | RNS |
| 27/06/16 | 08:00:07 | 27 Jun 2016 | | Half yearly results | RNS |
| 16/06/16 | 16:49:09 | 16 Jun 2016 | | Holding(s) in Company | RNS |
| 16/06/16 | 16:48:27 | 16 Jun 2016 | | Holding(s) in Company | RNS |
| 16/06/16 | 12:02:58 | 16 Jun 2016 | | Holding(s) in Company | RNS |
| 02/06/16 | 08:00:07 | 2 Jun 2016 | | Trading Update | RNS |
| 17/05/16 | 16:19:58 | 17 May 2016 | | Holding(s) in Company | RNS |
| 17/05/16 | 16:18:56 | 17 May 2016 | | Holding(s) in Company | RNS |
