| AGTUNNEL AS KONKURSBO | 938055017 | Sogndal | 6 July 2026 | Bankruptcy estate |
| DIMAIM SYSTEMS SL NUF | 937292449 | Es-33012 Oviedo, Asturias | 23 May 2026 | Active |
| ZÜBLIN SPEZIALTIEFBAU GES.M.B.H. NUF | 935926602 | At-1220 Wien | 18 August 2025 | Active |
| HUTNÍ MONTÁZE, A.S. NUF | 935826934 | Cz-703 00 Ostrava | 24 July 2025 | Active |
| METROSTAV CZ S.R.O. NUF | 935568749 | Lysaker | 12 June 2025 | Active |
| DAVAI BRIDGE & TUNNEL NORGE AS | 934749006 | Stord | 1 May 2025 | Active |
| BRV GROUP AS | 934908996 | Arendal | 2 January 2025 | Active |
| LNS HOLDING COMPANY AS | 934870735 | Risøyhamn | 19 December 2024 | Active |
| TUNNELLBORING AS | 934792416 | Utne | 10 December 2024 | Active |
| GLOBAL TUNNELLING EXPERTS B.V. NUF | 934371186 | 2909va Capelle Aan Den Ijssel | 12 November 2024 | Active |
| JV IMPLENIA STANGELAND E39 ROGFAST E02 ANS | 933681025 | Lysaker | 29 May 2024 | Active |
| O2 GRUPPEN AS | 933843262 | Alta | 27 May 2024 | Active |
| OSTROJ | 933252604 | Cz-746 41 Opava | 24 April 2024 | Active |
| BRO UNDERHÅLL & SERVICE BUS AB | 932396343 | Se-461 59 Trollhättan | 16 December 2023 | Active |
| BROTEKNIK I NORR AB | 832585092 | Se-943 36 Öjebyn | 16 December 2023 | Active |
| LNS HOLDING AS | 931748726 | Risøyhamn | 6 June 2023 | Active |
| WE WALTER S.R.L. | 930757330 | It-Cap 20093 Cologno Monzese (mi) | 16 February 2023 | Active |
| DAVAI BRIDGE & TUNNEL NUF | 930534862 | Dk-8500 Grenaa | 6 February 2023 | Active |
| FRACCAROLI E BALZAN S.P.A. | 930503878 | Pescantina (vr) Cap 37026 | 7 January 2023 | Active |
| JV IMPLENIA STANGELAND E39 ROGFAST ANS | 930702811 | Lysaker | 6 January 2023 | Active |
| JV STANGELAND - B&G TUNNEL ANS | 930683078 | Egersund | 21 December 2022 | Active |
| VMT GMBH | 930232327 | De-76646 Bruchsal | 1 December 2022 | Active |
| TARKON PROJEKT SP. Z.O.O. NUF | 829797852 | Pl-02-011 Warszawa | 29 September 2022 | Active |
| CONCRETI AS | 929046552 | Lillehammer | 14 March 2022 | Active |
| JV AF GHELLA ANS | 928721876 | Oslo | 27 January 2022 | Active |
| OWL CONTRACTOR SERVICES LTD | 928002934 | Newcastle upon Tyne Ne1 8jw | 27 October 2021 | Active |
| CONTUR AS | 927612372 | Kristiansand S | 5 July 2021 | Active |
| B45 ANLEGG AS | 926376918 | Lunde | 14 December 2020 | Active |
| IHI INFRASTRUCTURE SYSTEMS | 926069195 | Jp-Osaka 5900977 | 9 December 2020 | Active |
| NORHARD AS | 926060597 | Tonstad | 16 November 2020 | Active |
| AROX TUNNEL AS | 926096567 | Oslo | 23 October 2020 | Active |
| ØSTU-STETTIN HOCH UND TIEFBAU GMBH NUF | 924271043 | Kvitsøy | 7 January 2020 | Active |
| YIT INFRA NORGE AS | 923441182 | Bergen | 30 August 2019 | Active |
| BRV AS | 922405395 | Grimstad | 24 February 2019 | Active |
| VSL SYSTÉMY /CZ/, S.R.O. NUF | 921047673 | Cz-190 00 Praha 9 | 10 July 2018 | Active |
| KAV HOLDING AS | 920914144 | Færvik | 15 May 2018 | Active |
| CHINA COMMUNICATIONS CONSTRUCTION COMPANY NORWAY NUF | 920765866 | Oslo | 12 May 2018 | Active |
| MINÉR AS | 920036376 | Ålgård | 22 November 2017 | Active |
| WAYSS & FREYTAG INGENIURBAU AG | 919828730 | 60489 Frankfurt Am Main | 18 November 2017 | Active |
| WEBUILD S.P.A. NUF | 919342102 | Sandsli | 3 August 2017 | Active |
| WAGENBORG TOWAGE | 918890106 | NL-9934 CK, Delfzilj | 25 April 2017 | Active |
| HERRENKNECHT INTERNATIONAL LTD | 918687041 | Sunderland Sr5 2tz | 11 March 2017 | Active |
| BLAMEC OY | 918623558 | Fi-02940 Espoo | 27 February 2017 | Active |
| HERRENKNECHT ITALIA S.R.L. | 918033467 | Gessate 20060 | 10 November 2016 | Active |
| HERRENKNECHT (AUSTRALIA) PTY LIMITED | 917953848 | Asker | 5 November 2016 | Active |
| HERRENKNECHT FRANCE SARL | 917917280 | Fr-78400 Chatou | 24 October 2016 | Active |
| HERRENKNECHT (SCHWEIZ) AG | 917605157 | Ch-6474 Amsteg | 30 August 2016 | Active |
| HERRENKNECHT IBERICA SA | 917566291 | Es-28046 Madrid | 27 August 2016 | Active |
| AGTUNNEL AS | 917454809 | Sogndal | 14 June 2016 | Bankrupt |
| PRESISJONSBORING AS | 917386951 | Lierskogen | 12 May 2016 | Active |