| 28/03/22 | 07:00:07 | 28 Mar 2022 | | Transaction in Own Shares | RNS |
| 25/03/22 | 10:44:49 | 25 Mar 2022 | | Holding(s) in Company | RNS |
| 25/03/22 | 07:00:06 | 25 Mar 2022 | | Transaction in Own Shares | RNS |
| 24/03/22 | 07:00:06 | 24 Mar 2022 | | Transaction in Own Shares | RNS |
| 23/03/22 | 15:00:01 | 23 Mar 2022 | | Director/PDMR Shareholding | RNS |
| 23/03/22 | 14:30:01 | 23 Mar 2022 | | Director/PDMR Shareholding | RNS |
| 23/03/22 | 09:00:01 | 23 Mar 2022 | | Total Voting Rights | RNS |
| 23/03/22 | 07:00:04 | 23 Mar 2022 | | Transaction in Own Shares | RNS |
| 22/03/22 | 07:00:07 | 22 Mar 2022 | | Transaction in Own Shares | RNS |
| 21/03/22 | 07:00:08 | 21 Mar 2022 | | Transaction in Own Shares | RNS |
| 18/03/22 | 12:44:20 | 18 Mar 2022 | | Director/PDMR Shareholding | RNS |
| 18/03/22 | 07:00:05 | 18 Mar 2022 | | Transaction in Own Shares | RNS |
| 17/03/22 | 07:00:04 | 17 Mar 2022 | | Transaction in Own Shares | RNS |
| 16/03/22 | 16:13:23 | 16 Mar 2022 | | Director/PDMR Shareholding | RNS |
| 16/03/22 | 07:00:03 | 16 Mar 2022 | | Transaction in Own Shares | RNS |
| 15/03/22 | 07:00:05 | 15 Mar 2022 | | Transaction in Own Shares | RNS |
| 14/03/22 | 07:00:10 | 14 Mar 2022 | | Transaction in Own Shares | RNS |
| 11/03/22 | 07:00:04 | 11 Mar 2022 | | Transaction in Own Shares | RNS |
| 10/03/22 | 07:00:04 | 10 Mar 2022 | | Transaction in Own Shares | RNS |
| 09/03/22 | 07:00:09 | 9 Mar 2022 | | Transaction in Own Shares | RNS |
| 08/03/22 | 07:00:04 | 8 Mar 2022 | | Transaction in Own Shares | RNS |
| 07/03/22 | 07:00:07 | 7 Mar 2022 | | Transaction in Own Shares | RNS |
| 04/03/22 | 07:00:07 | 4 Mar 2022 | | Transaction in Own Shares | RNS |
| 03/03/22 | 07:00:05 | 3 Mar 2022 | | Transaction in Own Shares | RNS |
| 02/03/22 | 07:00:03 | 2 Mar 2022 | | Transaction in Own Shares | RNS |
| 01/03/22 | 14:58:45 | 1 Mar 2022 | | Director/PDMR Shareholding | RNS |
| 01/03/22 | 07:00:07 | 1 Mar 2022 | | Transaction in Own Shares | RNS |
| 28/02/22 | 07:00:06 | 28 Feb 2022 | | Transaction in Own Shares | RNS |
| 25/02/22 | 07:00:07 | 25 Feb 2022 | | Transaction in Own Shares | RNS |
| 24/02/22 | 07:00:08 | 24 Feb 2022 | | Transaction in Own Shares | RNS |
| 23/02/22 | 11:37:15 | 23 Feb 2022 | | Total Voting Rights | RNS |
| 23/02/22 | 07:00:03 | 23 Feb 2022 | | Transaction in Own Shares | RNS |
| 22/02/22 | 07:00:08 | 22 Feb 2022 | | Transaction in Own Shares | RNS |
| 21/02/22 | 07:00:07 | 21 Feb 2022 | | Transaction in Own Shares | RNS |
| 18/02/22 | 07:00:07 | 18 Feb 2022 | | Transaction in Own Shares | RNS |
| 17/02/22 | 12:39:12 | 17 Feb 2022 | | Director/PDMR Shareholding | RNS |
| 17/02/22 | 07:00:08 | 17 Feb 2022 | | Transaction in Own Shares | RNS |
| 16/02/22 | 07:00:07 | 16 Feb 2022 | | Transaction in Own Shares | RNS |
| 15/02/22 | 07:00:04 | 15 Feb 2022 | | Transaction in Own Shares | RNS |
| 14/02/22 | 07:00:08 | 14 Feb 2022 | | Share buyback programme | RNS |
| 11/02/22 | 12:28:44 | 11 Feb 2022 | | Director/PDMR Shareholding | RNS |
| 11/02/22 | 12:13:32 | 11 Feb 2022 | | Director/PDMR Shareholding | RNS |
| 10/02/22 | 11:47:48 | 10 Feb 2022 | | Appointment of joint corporate broker | RNS |
| 07/02/22 | 08:00:01 | 7 Feb 2022 | | Johnson Matthey Clean Air roundtable | RNS |
| 01/02/22 | 08:00:07 | 1 Feb 2022 | | Total Voting Rights | RNS |
| 01/02/22 | 07:00:03 | 1 Feb 2022 | | Advanced Glass Technologies sale completion | RNS |
| 28/01/22 | 17:44:43 | 28 Jan 2022 | | Transaction in Own Shares | RNS |
| 28/01/22 | 07:00:07 | 28 Jan 2022 | | Transaction in Own Shares | RNS |
| 27/01/22 | 07:00:07 | 27 Jan 2022 | | Transaction in Own Shares | RNS |
| 26/01/22 | 07:00:04 | 26 Jan 2022 | | Transaction in Own Shares | RNS |
