| 25/04/13 | 15:58:15 | 25 Apr 2013 | | Statement re proposed merger | RNS |
| 25/04/13 | 08:00:52 | 25 Apr 2013 | | Announcement re Irrevocables | RNS |
| 24/04/13 | 16:15:24 | 24 Apr 2013 | | Re. Scrip Dividend | RNS |
| 24/04/13 | 11:52:33 | 24 Apr 2013 | | Re. Kier Group announcement | RNS |
| 15/04/13 | 08:00:11 | 15 Apr 2013 | | Form 8 (DD) Costain Group PLC | RNS |
| 15/04/13 | 08:00:11 | 15 Apr 2013 | | Deferred Share Bonus Plan | RNS |
| 15/04/13 | 08:00:07 | 15 Apr 2013 | | Costain joint ventures win two Crossrail contracts | RNS |
| 11/04/13 | 16:47:46 | 11 Apr 2013 | | Form 8 (DD) - Costain Group plc | RNS |
| 11/04/13 | 16:46:03 | 11 Apr 2013 | | Form 8 (DD) - Costain Group plc | RNS |
| 11/04/13 | 08:00:37 | 11 Apr 2013 | | Rule 2.10 Announcement | RNS |
| 11/04/13 | 08:00:22 | 11 Apr 2013 | | Re Contract | RNS |
| 09/04/13 | 08:00:10 | 9 Apr 2013 | | Costain Group PLC Long Term Incentive Plan | RNS |
| 05/04/13 | 16:14:26 | 5 Apr 2013 | | Public Dealing Disclosure | RNS |
| 05/04/13 | 09:21:03 | 5 Apr 2013 | | Deferred Share Bonus Plan | RNS |
| 05/04/13 | 09:20:06 | 5 Apr 2013 | | Director/PDMR Shareholding | RNS |
| 28/03/13 | 16:21:20 | 28 Mar 2013 | | LTIP Listing Application | RNS |
| 28/03/13 | 16:17:52 | 28 Mar 2013 | | Notice of AGM | RNS |
| 27/03/13 | 07:00:03 | 27 Mar 2013 | | Recommended all-share merger | RNS |
| 06/03/13 | 07:00:12 | 6 Mar 2013 | | Final Results | RNS |
| 18/02/13 | 07:00:10 | 18 Feb 2013 | | Re Contract | RNS |
| 09/01/13 | 07:00:06 | 9 Jan 2013 | | Re Contract | RNS |
| 04/01/13 | 07:00:04 | 4 Jan 2013 | | Trading Update | RNS |
