| 16/03/20 | 16:43:04 | 16 Mar 2020 | | Second Price Monitoring Extn | RNS |
| 16/03/20 | 16:37:52 | 16 Mar 2020 | | Price Monitoring Extension | RNS |
| 11/03/20 | 07:00:07 | 11 Mar 2020 | | Fully Underwritten Capital Raising of up to £100m | RNS |
| 11/03/20 | 07:00:05 | 11 Mar 2020 | | Final Results | RNS |
| 13/02/20 | 15:44:05 | 13 Feb 2020 | | Holding(s) in Company | RNS |
| 06/02/20 | 07:05:01 | 6 Feb 2020 | | Directorate Change | RNS |
| 02/01/20 | 10:00:04 | 2 Jan 2020 | | Block listing Six Monthly Return | RNS |
| 12/12/19 | 07:00:16 | 12 Dec 2019 | | Update on the A465 contract and trading | RNS |
| 11/12/19 | 13:32:08 | 11 Dec 2019 | | Completion of the Disposal of Alcaidesa Holding | RNS |
| 11/12/19 | 07:00:08 | 11 Dec 2019 | | Disposal of Alcaidesa Holding, S.A.U | RNS |
| 04/11/19 | 14:09:33 | 4 Nov 2019 | | Director/PDMR Shareholding | RNS |
| 01/11/19 | 11:05:05 | 1 Nov 2019 | | Total Voting Rights and Capital | RNS |
| 28/10/19 | 16:13:43 | 28 Oct 2019 | | Holding(s) in Company | RNS |
| 28/10/19 | 07:00:09 | 28 Oct 2019 | | NEW CONTRACT AWARDS ACROSS THE HIGHWAYS SECTOR | RNS |
| 18/10/19 | 12:01:01 | 18 Oct 2019 | | Director/PDMR Shareholding | RNS |
| 16/10/19 | 08:00:05 | 16 Oct 2019 | | SOUTHERN WATER SELECTS COSTAIN JV AS AMP7 PARTNER | RNS |
| 15/10/19 | 09:01:01 | 15 Oct 2019 | | 2019 Interim Dividend - Scrip Alternative | RNS |
| 11/10/19 | 12:35:16 | 11 Oct 2019 | | Holding(s) in Company | RNS |
| 25/09/19 | 14:00:03 | 25 Sept 2019 | | Director Declaration | RNS |
| 23/09/19 | 17:28:32 | 23 Sept 2019 | | Director/PDMR Shareholding | RNS |
| 19/09/19 | 12:52:25 | 19 Sept 2019 | | Scrip Dividend Reference Price | RNS |
| 12/09/19 | 11:21:00 | 12 Sept 2019 | | Holding(s) in Company | RNS |
| 21/08/19 | 08:00:02 | 21 Aug 2019 | | Half-year Report | RNS |
| 16/08/19 | 11:26:49 | 16 Aug 2019 | | Holding(s) in Company | RNS |
| 05/08/19 | 12:36:53 | 5 Aug 2019 | | Holding(s) in Company | RNS |
| 25/07/19 | 17:54:34 | 25 Jul 2019 | | Holding(s) in Company | RNS |
| 24/07/19 | 16:53:52 | 24 Jul 2019 | | Holding(s) in Company | RNS |
| 12/07/19 | 11:07:09 | 12 Jul 2019 | | Holding(s) in Company | RNS |
| 09/07/19 | 08:00:09 | 9 Jul 2019 | | Costain to deliver Gatwick station redevelopment | RNS |
| 05/07/19 | 12:56:26 | 5 Jul 2019 | | Holding(s) in Company | RNS |
| 03/07/19 | 16:37:50 | 3 Jul 2019 | | Holding(s) in Company | RNS |
| 02/07/19 | 17:01:57 | 2 Jul 2019 | | Holding(s) in Company | RNS |
| 02/07/19 | 08:00:05 | 2 Jul 2019 | | Capital Markets Event | RNS |
| 01/07/19 | 11:32:02 | 1 Jul 2019 | | Block listing six monthly return | RNS |
| 28/06/19 | 08:00:04 | 28 Jun 2019 | | Trading Update | RNS |
| 25/06/19 | 08:00:05 | 25 Jun 2019 | | United Utilities framework contract | RNS |
| 31/05/19 | 11:33:21 | 31 May 2019 | | Total Voting Rights and Capital | RNS |
| 15/05/19 | 08:00:04 | 15 May 2019 | | Dividend - Scrip Alternative | RNS |
| 08/05/19 | 11:31:50 | 8 May 2019 | | Grant of nil cost options | RNS |
| 07/05/19 | 17:50:29 | 7 May 2019 | | Result of AGM | RNS |
| 03/05/19 | 13:02:05 | 3 May 2019 | | Director/PDMR Shareholding | RNS |
| 02/05/19 | 13:38:30 | 2 May 2019 | | Holding(s) in Company | RNS |
| 01/05/19 | 09:59:46 | 1 May 2019 | | Total Voting Rights and Capital | RNS |
| 18/04/19 | 12:11:46 | 18 Apr 2019 | | Scrip Dividend Reference Price | RNS |
| 09/04/19 | 12:20:00 | 9 Apr 2019 | | Director/PDMR Shareholding | RNS |
| 08/04/19 | 09:30:03 | 8 Apr 2019 | | Director Declaration | RNS |
| 03/04/19 | 15:51:28 | 3 Apr 2019 | | Director/PDMR Shareholding | RNS |
| 03/04/19 | 09:57:14 | 3 Apr 2019 | | Long Term Incentive Plan - Listing Application | RNS |
| 29/03/19 | 09:02:25 | 29 Mar 2019 | | Total Voting Rights and Capital | RNS |
| 22/03/19 | 10:53:55 | 22 Mar 2019 | | Notice of AGM | RNS |
