Transaction in Own Shares

About this update from Costain Group Plc

    18 th August 2025   Costain Group PLC Transaction in own shares and completion of share buyback programme     Costain Group PLC ("Costain", "the Group" or "the Company") announces that, in accordance with the terms of its share buyback programme (the "Buyback Programme") announced on 16 th June 2025, it has purchased the following number of its ordinary shares of 1 pence each ("Ordinary Shares") on the London Stock Exchange through Panmure Liberum.   Date of Purchase 15 th August 2025 Number of Ordinary Shares purchased 225,900 Weighted average price per day (pence) 164.08 Highest price per share (pence) 165.80 Lowest price per share (pence) 162.80   The purchased Ordinary Shares will be cancelled. The Company does not hold any Ordinary Shares in treasury.   Costain has now purchased 6,395,100 Ordinary Shares in aggregate for cancellation under the Buyback Programme.  Following settlement of the above purchases and cancellation of the purchased Ordinary Shares, the Group's total number of Ordinary Shares in issue will be 266,603,375 Ordinary Shares.   The £10m Buyback Programme is now complete in accordance with its terms.   Details of Trades:        Aggregate information Venue Volume-weighted average price (p) Aggregated volume Lowest price per share (p) Highest price per share (p) XLON 164.11 139,700 162.80 165.80 BATE 164.03 71,000 162.80 164.60 CHIX 163.98 12,000 163.00 164.60 TRQX 164.02 3,200 163.20 164.60   Individual Transactions   In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 as it applies in the UK (the Market Abuse Regulation), the table below contains detailed information of the individual trades made by Panmure Liberum on behalf of Costain as part of the Buyback Programme.     Time of transaction Number of shares purchased Transaction price (pence per share) Venue Transaction reference no. 08:07:31 1461 163.00 CHIX 00041482289TRLO0 08:07:31 1465 163.00 BATE 00041482290TRLO0 08:07:31 999 163.00 XLON 00041482291TRLO0 08:09:31 988 162.80 XLON 00041482346TRLO0 08:09:31 1282 162.80 BATE 00041482347TRLO0 08:14:35 1060 162.80 BATE 00041482490TRLO0 08:14:35 987 162.80 XLON 00041482491TRLO0 08:29:48 968 163.40 XLON 00041482841TRLO0 08:31:09 1611 163.40 BATE 00041482886TRLO0 08:31:09 1560 163.40 XLON 00041482887TRLO0 08:31:20 610 164.20 XLON 00041482903TRLO0 08:31:20 137 164.20 XLON 00041482904TRLO0 08:36:14 1565 164.20 XLON 00041483036TRLO0 08:36:14 893 164.00 CHIX 00041483033TRLO0 08:36:14 1379 164.00 BATE 00041483034TRLO0 08:36:14 1549 164.00 XLON 00041483035TRLO0 08:36:18 881 164.20 XLON 00041483040TRLO0 08:42:22 1536 164.60 XLON 00041483173TRLO0 08:50:38 723 164.60 XLON 00041483436TRLO0 08:50:38 228 164.60 XLON 00041483437TRLO0 08:50:38 977 164.60 BATE 00041483438TRLO0 08:55:59 1648 164.40 BATE 00041483592TRLO0 08:55:59 1423 164.40 XLON 00041483593TRLO0 08:55:59 1407 164.40 XLON 00041483594TRLO0 08:55:59 1407 164.40 BATE 00041483595TRLO0 09:11:31 280 164.60 XLON 00041484030TRLO0 09:11:31 1177 164.60 BATE 00041484031TRLO0 09:18:29 1083 164.80 XLON 00041484223TRLO0 09:18:29 206 164.60 BATE 00041484222TRLO0 09:21:18 994 164.40 CHIX 00041484293TRLO0 09:21:18 1024 164.40 BATE 00041484294TRLO0 09:21:18 5378 164.40 XLON 00041484295TRLO0 09:21:18 717 164.20 BATE 00041484296TRLO0 09:21:18 1080 164.20 XLON 00041484297TRLO0 09:21:25 1088 164.00 XLON 00041484299TRLO0 09:21:25 1337 163.80 XLON 00041484300TRLO0 09:25:00 1515 163.60 XLON 00041484379TRLO0 09:30:58 939 164.20 BATE 00041484631TRLO0 09:40:03 1184 164.00 BATE 00041484897TRLO0 09:40:03 1467 164.00 XLON 00041484898TRLO0 09:40:05 1068 164.00 XLON 00041484909TRLO0 09:43:36 853 163.80 XLON 00041485002TRLO0 09:45:25 385 163.20 TRQX 00041485027TRLO0 10:03:26 1209 163.80 XLON 00041485503TRLO0 10:03:26 1701 163.60 BATE 00041485502TRLO0 10:03:26 874 163.60 XLON 00041485504TRLO0 10:10:33 80 164.40 TRQX 00041485679TRLO0 10:10:33 286 164.40 TRQX 00041485680TRLO0 10:10:55 45 164.20 TRQX 00041485684TRLO0 10:11:31 1181 164.20 BATE 00041485692TRLO0 10:11:31 210 164.20 TRQX 00041485693TRLO0 10:13:01 933 164.00 CHIX 00041485722TRLO0 10:13:01 829 164.00 BATE 00041485723TRLO0 10:13:01 1647 164.00 XLON 00041485724TRLO0 10:18:11 71 164.20 XLON 00041485877TRLO0 10:18:11 489 164.20 XLON 00041485878TRLO0 10:18:11 671 164.20 XLON 00041485879TRLO0 10:18:11 1108 164.00 BATE 00041485875TRLO0 10:18:11 1225 164.00 XLON 00041485876TRLO0 10:24:07 1220 164.80 XLON 00041486080TRLO0 10:24:29 1513 164.80 XLON 00041486089TRLO0 10:27:20 730 164.80 XLON 00041486157TRLO0 10:27:20 420 164.80 XLON 00041486158TRLO0 10:30:23 922 164.60 BATE 00041486245TRLO0 10:30:23 554 164.60 BATE 00041486246TRLO0 10:30:23 2093 164.60 XLON 00041486247TRLO0 10:30:23 172 164.60 TRQX 00041486248TRLO0 10:31:21 1338 164.40 BATE 00041486279TRLO0 10:31:21 1210 164.40 XLON 00041486280TRLO0 10:31:25 489 164.40 XLON 00041486282TRLO0 10:31:25 538 164.40 XLON 00041486283TRLO0 10:31:25 13 164.40 XLON 00041486284TRLO0 10:44:00 870 164.60 CHIX 00041486564TRLO0 10:44:00 1404 164.60 BATE 00041486565TRLO0 10:44:00 1455 164.60 XLON 00041486566TRLO0 10:52:40 525 164.60 XLON 00041486835TRLO0 10:52:40 1562 164.60 XLON 00041486836TRLO0 10:52:40 59 164.60 XLON 00041486837TRLO0 10:52:40 1590 164.40 BATE 00041486832TRLO0 10:52:40 546 164.40 XLON 00041486833TRLO0 10:52:40 1543 164.40 XLON 00041486834TRLO0 11:03:12 684 164.20 XLON 00041487232TRLO0 11:03:12 686 164.20 XLON 00041487233TRLO0 11:03:22 1148 164.20 XLON 00041487235TRLO0 11:03:22 1148 164.20 BATE 00041487236TRLO0 11:03:22 257 164.20 TRQX 00041487237TRLO0 11:34:00 1144 164.20 CHIX 00041488249TRLO0 11:34:00 1314 164.20 BATE 00041488250TRLO0 11:41:18 1333 164.00 XLON 00041488391TRLO0 11:48:18 1328 164.20 BATE 00041488491TRLO0 11:48:18 220 164.20 TRQX 00041488492TRLO0 11:48:18 1475 164.20 XLON 00041488493TRLO0 11:53:23 1056 164.40 XLON 00041488565TRLO0 11:56:56 1486 164.40 XLON 00041488624TRLO0 12:07:17 668 164.40 BATE 00041488918TRLO0 12:07:17 488 164.40 BATE 00041488919TRLO0 12:07:17 1272 164.40 XLON 00041488920TRLO0 12:13:25 1060 164.40 BATE 00041489066TRLO0 12:13:25 1277 164.40 XLON 00041489067TRLO0 12:27:06 878 164.20 CHIX 00041489428TRLO0 12:27:06 1015 164.20 BATE 00041489429TRLO0 12:27:06 1122 164.20 XLON 00041489430TRLO0 12:28:56 117 164.20 XLON 00041489491TRLO0 12:28:56 156 164.20 XLON 00041489492TRLO0 12:28:56 1552 164.20 XLON 00041489493TRLO0 12:28:56 1000 164.20 XLON 00041489494TRLO0 12:28:56 554 164.20 XLON 00041489495TRLO0 12:28:56 1193 164.20 XLON 00041489496TRLO0 12:28:56 292 164.00 BATE 00041489488TRLO0 12:28:56 1266 164.00 BATE 00041489489TRLO0 12:28:56 1136 164.00 XLON 00041489490TRLO0 12:30:30 1138 164.00 XLON 00041489562TRLO0 12:39:15 1530 164.00 BATE 00041489827TRLO0 12:39:15 1407 164.00 XLON 00041489828TRLO0 12:39:15 165 164.00 XLON 00041489829TRLO0 12:39:15 193 164.00 TRQX 00041489830TRLO0 12:48:14 1268 164.00 BATE 00041490199TRLO0 12:48:14 1651 164.00 XLON 00041490200TRLO0 12:55:16 1087 164.00 BATE 00041490357TRLO0 12:55:16 320 164.00 BATE 00041490358TRLO0 13:21:37 966 164.20 CHIX 00041490884TRLO0 13:21:37 1766 164.20 BATE 00041490885TRLO0 13:29:59 1926 164.00 XLON 00041491124TRLO0 13:59:42 109 164.20 BATE 00041492200TRLO0 13:59:42 329 164.20 BATE 00041492201TRLO0 13:59:42 2491 164.20 BATE 00041492202TRLO0 13:59:42 1415 164.00 BATE 00041492197TRLO0 13:59:42 413 164.00 TRQX 00041492198TRLO0 13:59:42 2935 164.00 XLON 00041492199TRLO0 14:02:58 2286 164.00 XLON 00041492320TRLO0 14:03:05 1606 163.80 XLON 00041492325TRLO0 14:03:05 1272 163.80 BATE 00041492326TRLO0 14:03:05 856 163.80 CHIX 00041492327TRLO0 14:03:06 206 163.80 BATE 00041492332TRLO0 14:08:46 1385 164.00 BATE 00041492477TRLO0 14:08:46 2159 164.00 XLON 00041492478TRLO0 14:12:41 1630 164.00 XLON 00041492556TRLO0 14:12:41 414 164.00 XLON 00041492557TRLO0 14:12:41 697 163.80 BATE 00041492553TRLO0 14:12:41 895 163.80 XLON 00041492554TRLO0 14:12:41 1289 163.80 XLON 00041492555TRLO0 14:14:24 709 164.00 XLON 00041492590TRLO0 14:14:24 68 164.00 XLON 00041492591TRLO0 14:23:10 5667 164.00 XLON 00041492802TRLO0 14:25:03 1424 163.80 BATE 00041492840TRLO0 14:25:03 2403 163.80 XLON 00041492841TRLO0 14:25:27 518 163.80 XLON 00041492856TRLO0 14:25:49 209 163.80 BATE 00041492859TRLO0 14:26:26 320 163.80 BATE 00041492875TRLO0 14:26:26 1480 163.80 XLON 00041492876TRLO0 14:28:16 808 163.80 XLON 00041492923TRLO0 14:30:12 100 163.80 CHIX 00041493003TRLO0 14:33:18 911 163.80 CHIX 00041493172TRLO0 14:33:18 2277 163.80 BATE 00041493173TRLO0 14:33:18 2733 163.80 XLON 00041493174TRLO0 14:33:18 205 163.80 TRQX 00041493175TRLO0 14:35:37 694 163.80 XLON 00041493246TRLO0 14:35:37 1388 163.80 XLON 00041493247TRLO0 14:35:37 444 163.80 BATE 00041493249TRLO0 14:35:47 69 163.80 BATE 00041493252TRLO0 14:38:34 1591 163.80 BATE 00041493316TRLO0 14:38:34 1733 163.80 XLON 00041493317TRLO0 14:44:58 305 163.80 BATE 00041493529TRLO0 14:44:58 5667 163.80 XLON 00041493530TRLO0 14:45:08 2116 163.80 BATE 00041493548TRLO0 14:45:08 389 163.80 BATE 00041493549TRLO0 14:45:08 309 163.80 CHIX 00041493550TRLO0 14:45:08 1832 163.80 XLON 00041493551TRLO0 14:52:38 90 164.00 CHIX 00041493764TRLO0 14:54:46 32 164.00 CHIX 00041493826TRLO0 14:54:46 25 164.00 CHIX 00041493827TRLO0 14:57:06 71 164.00 CHIX 00041493892TRLO0 14:57:07 755 164.00 XLON 00041493893TRLO0 14:57:07 345 164.00 XLON 00041493894TRLO0 14:57:10 49 164.00 CHIX 00041493897TRLO0 15:01:02 221 164.00 CHIX 00041493990TRLO0 15:06:50 123 164.20 CHIX 00041494190TRLO0 15:06:50 518 164.20 XLON 00041494193TRLO0 15:06:50 1064 164.20 XLON 00041494194TRLO0 15:06:50 622 164.20 XLON 00041494195TRLO0 15:06:50 1708 164.20 XLON 00041494196TRLO0 15:06:50 14 164.00 CHIX 00041494191TRLO0 15:06:50 175 164.00 BATE 00041494192TRLO0 15:14:27 479 164.20 CHIX 00041494434TRLO0 15:19:42 1403 164.20 BATE 00041494710TRLO0 15:19:42 275 164.20 CHIX 00041494711TRLO0 15:19:42 1160 164.20 XLON 00041494712TRLO0 15:19:42 1532 164.20 XLON 00041494713TRLO0 15:19:42 1653 164.20 XLON 00041494714TRLO0 15:19:42 862 164.20 XLON 00041494715TRLO0 15:19:42 96 164.20 XLON 00041494716TRLO0 15:19:42 992 164.20 BATE 00041494717TRLO0 15:19:42 311 164.20 BATE 00041494718TRLO0 15:19:42 115 164.20 CHIX 00041494721TRLO0 15:19:42 162 164.20 TRQX 00041494722TRLO0 15:19:42 1132 164.20 BATE 00041494723TRLO0 15:19:42 1860 164.20 BATE 00041494724TRLO0 15:19:42 1746 164.20 XLON 00041494725TRLO0 15:19:42 1508 164.20 XLON 00041494726TRLO0 15:19:42 921 164.20 XLON 00041494727TRLO0 15:19:42 160 164.00 TRQX 00041494719TRLO0 15:19:42 1702 164.00 XLON 00041494720TRLO0 15:21:23 914 164.20 BATE 00041494802TRLO0 15:22:34 36 164.00 BATE 00041494832TRLO0 15:22:34 3436 164.00 BATE 00041494833TRLO0 15:22:34 3844 164.00 XLON 00041494834TRLO0 15:22:34 244 164.00 TRQX 00041494835TRLO0 15:22:34 154 164.00 CHIX 00041494836TRLO0 15:26:42 1435 164.00 BATE 00041494936TRLO0 15:26:42 1590 164.00 XLON 00041494937TRLO0 15:26:42 168 164.00 TRQX 00041494938TRLO0 15:28:43 37 164.00 CHIX 00041494998TRLO0 15:28:43 1114 164.00 XLON 00041494999TRLO0 15:28:43 988 164.00 BATE 00041495000TRLO0 15:28:43 17 164.00 BATE 00041495001TRLO0 15:44:33 104 164.80 XLON 00041495683TRLO0 15:44:33 774 164.80 XLON 00041495684TRLO0 15:45:15 646 165.40 XLON 00041495720TRLO0 15:45:15 493 165.40 XLON 00041495721TRLO0 15:45:15 376 165.40 XLON 00041495722TRLO0 15:45:16 286 165.40 XLON 00041495725TRLO0 15:45:30 52 165.40 XLON 00041495750TRLO0 15:45:30 252 165.40 XLON 00041495751TRLO0 15:45:49 32 165.40 XLON 00041495765TRLO0 15:45:55 30 165.40 XLON 00041495771TRLO0 15:46:04 36 165.40 XLON 00041495777TRLO0 15:46:33 29 165.40 XLON 00041495785TRLO0 15:47:00 25 165.40 XLON 00041495795TRLO0 15:47:24 5 165.40 XLON 00041495810TRLO0 15:47:29 25 165.40 XLON 00041495823TRLO0 15:47:52 24 165.40 XLON 00041495833TRLO0 15:48:16 25 165.40 XLON 00041495861TRLO0 15:48:40 24 165.40 XLON 00041495873TRLO0 15:52:16 85 165.80 XLON 00041495995TRLO0 15:53:55 14 165.80 XLON 00041496056TRLO0 15:53:55 2 165.80 XLON 00041496057TRLO0 15:53:55 3 165.80 XLON 00041496058TRLO0 15:53:55 235 165.80 XLON 00041496059TRLO0 15:53:55 23 165.60 XLON 00041496060TRLO0 16:00:32 100 165.80 XLON 00041496339TRLO0   Enquiries:   Investors and analysts Matt Jones, Costain   [email protected] +44 (0) 7860 922 341 Financial media - Headland Andy Rivett-Carnac Charlie Twigg [email protected] +44 (0) 7968 997365 +44 (0) 7946 494568   Issuer name: Costain Group PLC LEI: 213800PKIJBZ2EDTKC88 ISIN: GB00B64NSP76 Classification: 2.4. Acquisition or disposal of the issuer's own shares Intermediary name: Panmure Liberum Intermediary Code: PMURGB2LXXX Timezone: BST Currency: GBp

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