| 14/04/26 | 15:29:51 | 14 Apr 2026 | | Director Declaration | RNS |
| 13/04/26 | 11:20:14 | 13 Apr 2026 | | Director/PDMR Shareholding | RNS |
| 08/04/26 | 10:30:00 | 8 Apr 2026 | | Transaction in Own Shares | RNS |
| 02/04/26 | 11:19:29 | 2 Apr 2026 | | Annual Financial Report | RNS |
| 01/04/26 | 10:30:00 | 1 Apr 2026 | | Transaction in Own Shares | RNS |
| 01/04/26 | 09:30:00 | 1 Apr 2026 | | Director/PDMR Shareholding | RNS |
| 01/04/26 | 08:59:47 | 1 Apr 2026 | | Total Voting Rights | RNS |
| 27/03/26 | 15:35:52 | 27 Mar 2026 | | Additional Listing | RNS |
| 25/03/26 | 10:30:00 | 25 Mar 2026 | | Transaction in Own Shares | RNS |
| 18/03/26 | 10:30:00 | 18 Mar 2026 | | Transaction in Own Shares | RNS |
| 18/03/26 | 07:00:12 | 18 Mar 2026 | | Costain Secures c.£45m Contract with Severn Trent | RNS |
| 10/03/26 | 07:01:02 | 10 Mar 2026 | | £20m Share Buyback Programme | RNS |
| 10/03/26 | 07:00:07 | 10 Mar 2026 | | Final Results | RNS |
| 04/03/26 | 08:27:35 | 4 Mar 2026 | | Directorate change | RNS |
| 03/03/26 | 10:57:09 | 3 Mar 2026 | | Holding(s) in Company | RNS |
| 02/03/26 | 07:00:15 | 2 Mar 2026 | | Costain returns to FTSE 250 | RNS |
| 25/02/26 | 18:00:00 | 25 Feb 2026 | | Ashtead Group | RNS |
| 24/02/26 | 15:59:17 | 24 Feb 2026 | | Director Declaration | RNS |
| 23/02/26 | 14:59:16 | 23 Feb 2026 | | Holding(s) in Company | RNS |
| 20/02/26 | 16:19:19 | 20 Feb 2026 | | Holding(s) in Company | RNS |
| 18/02/26 | 13:55:16 | 18 Feb 2026 | | Holding(s) in Company | RNS |
| 09/02/26 | 14:50:29 | 9 Feb 2026 | | Holding(s) in Company | RNS |
| 09/02/26 | 07:00:09 | 9 Feb 2026 | | Investor Presentation via Investor Meet Company | RNS |
| 04/02/26 | 18:22:49 | 4 Feb 2026 | | Holding(s) in Company | RNS |
| 29/01/26 | 10:17:49 | 29 Jan 2026 | | Holding(s) in Company | RNS |
| 28/01/26 | 10:58:25 | 28 Jan 2026 | | Holding(s) in Company | RNS |
| 27/01/26 | 07:00:03 | 27 Jan 2026 | | Costain Awarded Contract for New M5 Junction | RNS |
| 26/01/26 | 18:27:03 | 26 Jan 2026 | | Holding(s) in Company | RNS |
| 26/01/26 | 07:00:06 | 26 Jan 2026 | | New Pension Scheme Agreement & FY25 Trading Update | RNS |
| 23/01/26 | 15:38:03 | 23 Jan 2026 | | Holding(s) in Company | RNS |
| 22/01/26 | 17:15:00 | 22 Jan 2026 | | Holding(s) in Company | RNS |
| 21/01/26 | 13:29:38 | 21 Jan 2026 | | Holding(s) in Company | RNS |
| 16/01/26 | 14:27:45 | 16 Jan 2026 | | Holding(s) in Company | RNS |
| 16/01/26 | 07:00:01 | 16 Jan 2026 | | Holding(s) in Company | RNS |
| 13/01/26 | 14:49:47 | 13 Jan 2026 | | Holding(s) in Company | RNS |
| 05/01/26 | 15:43:43 | 5 Jan 2026 | | Holding(s) in Company | RNS |
| 02/01/26 | 11:45:21 | 2 Jan 2026 | | Holding(s) in Company | RNS |
| 02/01/26 | 11:09:21 | 2 Jan 2026 | | Block listing Interim Review | RNS |
| 31/12/25 | 12:16:55 | 31 Dec 2025 | | Holding(s) in Company | RNS |
| 30/12/25 | 14:12:45 | 30 Dec 2025 | | Holding(s) in Company | RNS |
| 29/12/25 | 11:18:31 | 29 Dec 2025 | | Holding(s) in Company | RNS |
| 23/12/25 | 13:41:49 | 23 Dec 2025 | | Holding(s) in Company | RNS |
| 22/12/25 | 09:38:34 | 22 Dec 2025 | | Holding(s) in Company | RNS |
| 19/12/25 | 11:35:16 | 19 Dec 2025 | | Holding(s) in Company | RNS |
| 19/12/25 | 07:00:08 | 19 Dec 2025 | | Notice of Trading Update | RNS |
| 18/12/25 | 09:40:09 | 18 Dec 2025 | | Holding(s) in Company | RNS |
| 17/12/25 | 16:39:51 | 17 Dec 2025 | | Holding(s) in Company | RNS |
| 16/12/25 | 15:40:32 | 16 Dec 2025 | | Holding(s) in Company | RNS |
| 15/12/25 | 15:49:02 | 15 Dec 2025 | | Holding(s) in Company | RNS |
| 12/12/25 | 12:20:30 | 12 Dec 2025 | | Holding(s) in Company | RNS |
