| 22/03/19 | 07:00:05 | 22 Mar 2019 | | Costain appointed to deliver A19 improvements | RNS |
| 20/03/19 | 07:00:04 | 20 Mar 2019 | | Costain selected as AMP7 delivery partner | RNS |
| 06/03/19 | 07:00:09 | 6 Mar 2019 | | Final Results | RNS |
| 06/03/19 | 07:00:07 | 6 Mar 2019 | | CEO Succession | RNS |
| 01/03/19 | 09:55:48 | 1 Mar 2019 | | Total Voting Rights | RNS |
| 26/02/19 | 08:32:45 | 26 Feb 2019 | | Holding(s) in Company | RNS |
| 25/02/19 | 14:18:41 | 25 Feb 2019 | | Holding(s) in Company | RNS |
| 06/02/19 | 11:56:44 | 6 Feb 2019 | | Holding(s) in Company | RNS |
| 31/01/19 | 12:20:54 | 31 Jan 2019 | | Total Voting Rights and Capital | RNS |
| 15/01/19 | 11:49:50 | 15 Jan 2019 | | Holding(s) in Company | RNS |
| 09/01/19 | 11:54:16 | 9 Jan 2019 | | Holding(s) in Company | RNS |
| 03/01/19 | 07:00:09 | 3 Jan 2019 | | Year End Trading Update | RNS |
| 02/01/19 | 08:00:04 | 2 Jan 2019 | | Block listing Interim Review | RNS |
| 02/01/19 | 08:00:04 | 2 Jan 2019 | | Total Voting Rights | RNS |
| 19/12/18 | 15:33:03 | 19 Dec 2018 | | Holding(s) in Company | RNS |
| 30/11/18 | 14:31:15 | 30 Nov 2018 | | Total Voting Rights | RNS |
| 30/11/18 | 07:00:02 | 30 Nov 2018 | | Notice of Analyst Event | RNS |
| 07/11/18 | 07:00:04 | 7 Nov 2018 | | Six-year framework contract award | RNS |
| 01/11/18 | 10:42:44 | 1 Nov 2018 | | Director/PDMR Shareholding | RNS |
| 01/11/18 | 10:42:33 | 1 Nov 2018 | | Total Voting Rights | RNS |
| 29/10/18 | 07:00:07 | 29 Oct 2018 | | Block Listing Application | RNS |
| 17/10/18 | 08:00:05 | 17 Oct 2018 | | A2/M2 connected corridor trial | RNS |
| 16/10/18 | 08:00:12 | 16 Oct 2018 | | 2018 Interim Dividend - Scrip Alternative | RNS |
| 26/09/18 | 16:57:56 | 26 Sept 2018 | | Holding(s) in Company | RNS |
| 24/09/18 | 14:00:33 | 24 Sept 2018 | | Director/PDMR Shareholding | RNS |
| 20/09/18 | 09:41:25 | 20 Sept 2018 | | Scrip Dividend Reference Price | RNS |
| 23/08/18 | 08:00:14 | 23 Aug 2018 | | Network Rail 'Meerkat' Technology Contract | RNS |
| 22/08/18 | 08:00:04 | 22 Aug 2018 | | Half-year Report | RNS |
| 21/08/18 | 08:00:10 | 21 Aug 2018 | | Connected Vehicle Technology Contract | RNS |
| 10/07/18 | 10:03:22 | 10 Jul 2018 | | Holding(s) in Company | RNS |
| 03/07/18 | 08:00:06 | 3 Jul 2018 | | Trading Update | RNS |
| 29/06/18 | 16:37:42 | 29 Jun 2018 | | Holding(s) in Company | RNS |
| 22/06/18 | 09:38:54 | 22 Jun 2018 | | Holding(s) in Company | RNS |
| 14/06/18 | 08:00:05 | 14 Jun 2018 | | Costain expands to new technology centre | RNS |
| 05/06/18 | 16:49:03 | 5 Jun 2018 | | Director/PDMR Shareholding | RNS |
| 04/06/18 | 08:00:07 | 4 Jun 2018 | | Costain awarded M6 smart motorway contract | RNS |
| 31/05/18 | 10:00:07 | 31 May 2018 | | Total Voting Rights | RNS |
| 15/05/18 | 08:00:03 | 15 May 2018 | | Dividend - Scrip Alternative | RNS |
| 08/05/18 | 17:29:26 | 8 May 2018 | | Result of AGM | RNS |
| 08/05/18 | 08:00:13 | 8 May 2018 | | Costain awarded technology contract | RNS |
| 08/05/18 | 08:00:08 | 8 May 2018 | | AGM Statement | RNS |
| 19/04/18 | 09:55:22 | 19 Apr 2018 | | Scrip Dividend Reference Price | RNS |
| 11/04/18 | 14:16:08 | 11 Apr 2018 | | Director/PDMR Shareholding | RNS |
| 04/04/18 | 15:52:14 | 4 Apr 2018 | | Director/PDMR Shareholding | RNS |
| 03/04/18 | 10:41:48 | 3 Apr 2018 | | Director Declaration | RNS |
| 29/03/18 | 10:01:58 | 29 Mar 2018 | | Total Voting Rights | RNS |
| 26/03/18 | 09:50:13 | 26 Mar 2018 | | Holding(s) in Company | RNS |
| 16/03/18 | 09:18:55 | 16 Mar 2018 | | Notice of AGM | RNS |
| 13/03/18 | 12:53:15 | 13 Mar 2018 | | Exercise of Nil Cost Options | RNS |
| 13/03/18 | 11:58:52 | 13 Mar 2018 | | Holding(s) in Company | RNS |
