| 04.08.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 01.08.2025 10:47 | COST | Holding(s) in Company | RNS |
| 01.08.2025 10:00 | COST | Total Voting Rights | RNS |
| 01.08.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 31.07.2025 10:40 | COST | Holding(s) in Company | RNS |
| 31.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 30.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 29.07.2025 15:03 | COST | Holding(s) in Company | RNS |
| 29.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 29.07.2025 07:00 | COST | Investor Presentation via Investor Meet Company | RNS |
| 28.07.2025 14:11 | COST | Holding(s) in Company | RNS |
| 28.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 25.07.2025 14:25 | COST | Holding(s) in Company | RNS |
| 25.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 24.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 23.07.2025 11:03 | COST | Holding(s) in Company | RNS |
| 23.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 22.07.2025 10:41 | COST | Holding(s) in Company | RNS |
| 22.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 21.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 18.07.2025 17:04 | COST | Holding(s) in Company | RNS |
| 18.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 17.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 16.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 16.07.2025 07:00 | COST | Holding(s) in Company | RNS |
| 15.07.2025 09:13 | COST | Holding(s) in Company | RNS |
| 15.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 14.07.2025 12:09 | COST | Holding(s) in Company | RNS |
| 14.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 11.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 10.07.2025 09:51 | COST | Holding(s) in Company | RNS |
| 10.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 09.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 08.07.2025 16:14 | COST | Holding(s) in Company | RNS |
| 08.07.2025 09:24 | COST | Holding(s) in Company | RNS |
| 08.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 07.07.2025 12:35 | COST | Holding(s) in Company | RNS |
| 07.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 04.07.2025 11:12 | COST | Holding(s) in Company | RNS |
| 04.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 03.07.2025 15:48 | COST | Holding(s) in Company | RNS |
| 03.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 02.07.2025 15:38 | COST | Total Voting Rights - Correction | RNS |
| 02.07.2025 08:37 | COST | Block listing Interim Review | RNS |
| 02.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 01.07.2025 14:33 | COST | Total Voting Rights | RNS |
| 01.07.2025 12:29 | COST | Holding(s) in Company | RNS |
| 01.07.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 30.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 27.06.2025 14:17 | COST | Holding(s) in Company | RNS |
| 27.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 26.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 25.06.2025 14:48 | COST | Holding(s) in Company | RNS |
| 25.06.2025 11:55 | COST | DIRECTOR/PDMR/PCA DEALING | RNS |
| 25.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 24.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 23.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 20.06.2025 07:00 | COST | Transaction in Own Shares | RNS |
| 19.06.2025 15:37 | COST | Holding(s) in Company | RNS |
| 16.06.2025 10:48 | COST | Costain announces share buyback amid pension progress, in line trading | Alliance |
| 16.06.2025 10:41 | TRD, COST | SMALL-CAP WINNERS: Triad swings to annual profit as revenue rises | Alliance |
| 16.06.2025 07:00 | COST | £10m Share Buyback Programme & H1 Trading Update | RNS |
| 09.06.2025 15:38 | COST | Holding(s) in Company | RNS |
| 09.06.2025 07:00 | COST | Heathrow Site Visit | RNS |
| 04.06.2025 12:17 | COST | Costain awarded Anglian Water contract extension | Reach |
| 04.06.2025 11:50 | COST | Holding(s) in Company | RNS |
| 02.06.2025 16:37 | COST | Total Voting Rights | RNS |
| 02.06.2025 15:45 | COST | Holding(s) in Company | RNS |
| 29.05.2025 12:19 | COST | Holding(s) in Company | RNS |
| 28.05.2025 07:00 | COST | Refinancing of Bank and Bonding Facilities | RNS |
| 27.05.2025 15:49 | COST | Additional Listing | RNS |
| 22.05.2025 14:05 | TPK, RKT, OTV2 | UK dividends calendar - next 7 days | Alliance |
| 22.05.2025 13:19 | COST | Holding(s) in Company | RNS |
| 19.05.2025 15:16 | COST | Holding(s) in Company | RNS |
| 19.05.2025 11:32 | COST | Holding(s) in Company | RNS |
