| 13/03/18 | | 12:53:15 | 13 Mar 2018 | | | Exercise of Nil Cost Options | Costain Group PLC | RNS |
| 13/03/18 | | 11:58:52 | 13 Mar 2018 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 12/03/18 | | 13:49:21 | 12 Mar 2018 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 06/03/18 | | 09:00:01 | 6 Mar 2018 | | | Long Term Incentive Plan - Listing Application | Costain Group PLC | RNS |
| 01/03/18 | | 07:00:09 | 1 Mar 2018 | | | Final Results | Costain Group PLC | RNS |
| 28/02/18 | | 09:00:02 | 28 Feb 2018 | | | Total Voting Rights | Costain Group PLC | RNS |
| 28/02/18 | | 08:38:19 | 28 Feb 2018 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 26/02/18 | | 10:07:19 | 26 Feb 2018 | | | Directorate Change | Costain Group PLC | RNS |
| 31/01/18 | | 09:00:02 | 31 Jan 2018 | | | Total Voting Rights | Costain Group PLC | RNS |
| 11/01/18 | | 12:32:44 | 11 Jan 2018 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 04/01/18 | | 07:00:02 | 4 Jan 2018 | | | Year End Trading Update | Costain Group PLC | RNS |
| 02/01/18 | | 08:00:01 | 2 Jan 2018 | | | Block listing Interim Review | Costain Group PLC | RNS |
| 02/01/18 | | 08:00:01 | 2 Jan 2018 | | | Total Voting Rights | Costain Group PLC | RNS |
| 18/12/17 | | 11:50:17 | 18 Dec 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 14/12/17 | | 07:00:07 | 14 Dec 2017 | | | Management Consultancy Framework Appointment | Costain Group PLC | RNS |
| 08/12/17 | | 08:00:01 | 8 Dec 2017 | | | Director/PDMR Shareholding | Costain Group PLC | RNS |
| 30/11/17 | | 08:00:01 | 30 Nov 2017 | | | Total Voting Rights | Costain Group PLC | RNS |
| 28/11/17 | | 15:18:36 | 28 Nov 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 24/11/17 | | 11:28:50 | 24 Nov 2017 | | | Board Notification - External Directorship | Costain Group PLC | RNS |
| 23/11/17 | | 14:48:24 | 23 Nov 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 17/11/17 | | 10:13:00 | 17 Nov 2017 | | | Appointment of Non Executive Director | Costain Group PLC | RNS |
| 01/11/17 | | 11:21:22 | 1 Nov 2017 | | | Director/PDMR Shareholding | Costain Group PLC | RNS |
| 01/11/17 | | 11:16:44 | 1 Nov 2017 | | | Total Voting Rights | Costain Group PLC | RNS |
| 25/10/17 | | 15:22:28 | 25 Oct 2017 | | | Director/PDMR Shareholding | Costain Group PLC | RNS |
| 20/10/17 | | 16:42:56 | 20 Oct 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 17/10/17 | | 08:00:05 | 17 Oct 2017 | | | Dividend - Scrip Alternative | Costain Group PLC | RNS |
| 29/09/17 | | 08:00:08 | 29 Sept 2017 | | | Greater Manchester Waste contract | Costain Group PLC | RNS |
| 25/09/17 | | 15:21:34 | 25 Sept 2017 | | | Director/PDMR Shareholding | Costain Group PLC | RNS |
| 21/09/17 | | 11:10:35 | 21 Sept 2017 | | | Scrip Dividend Reference Price | Costain Group PLC | RNS |
| 15/09/17 | | 10:39:25 | 15 Sept 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 04/09/17 | | 11:37:07 | 4 Sept 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 24/08/17 | | 08:00:04 | 24 Aug 2017 | | | Greater Manchester Waste contract | Costain Group PLC | RNS |
| 23/08/17 | | 08:00:02 | 23 Aug 2017 | | | Half-year Report | Costain Group PLC | RNS |
| 01/08/17 | | 08:00:11 | 1 Aug 2017 | | | Contract | Costain Group PLC | RNS |
| 20/07/17 | | 09:45:21 | 20 Jul 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 17/07/17 | | 09:12:27 | 17 Jul 2017 | | | High Speed Two "minded to award" Costain contracts | Costain Group PLC | RNS |
| 13/07/17 | | 13:19:13 | 13 Jul 2017 | | | Re: Directorate | Costain Group PLC | RNS |
| 04/07/17 | | 08:00:05 | 4 Jul 2017 | | | Trading Update | Costain Group PLC | RNS |
| 30/06/17 | | 10:00:01 | 30 Jun 2017 | | | Block listing Interim Review | Costain Group PLC | RNS |
| 31/05/17 | | 13:00:01 | 31 May 2017 | | | Total Voting Rights | Costain Group PLC | RNS |
| 16/05/17 | | 08:00:12 | 16 May 2017 | | | Dividend - Scrip Alternative | Costain Group PLC | RNS |
| 08/05/17 | | 17:55:41 | 8 May 2017 | | | Result of AGM | Costain Group PLC | RNS |
| 08/05/17 | | 08:00:09 | 8 May 2017 | | | AGM Statement | Costain Group PLC | RNS |
| 02/05/17 | | 17:37:41 | 2 May 2017 | | | Greater Manchester Waste contract | Costain Group PLC | RNS |
| 28/04/17 | | 14:56:31 | 28 Apr 2017 | | | Total Voting Rights | Costain Group PLC | RNS |
| 26/04/17 | | 18:06:11 | 26 Apr 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 13/04/17 | | 11:52:51 | 13 Apr 2017 | | | Scrip Dividend Reference Price | Costain Group PLC | RNS |
| 06/04/17 | | 10:40:21 | 6 Apr 2017 | | | Director/PDMR Shareholding | Costain Group PLC | RNS |
| 05/04/17 | | 11:02:02 | 5 Apr 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
| 04/04/17 | | 17:16:58 | 4 Apr 2017 | | | Holding(s) in Company | Costain Group PLC | RNS |
