| Company Name | Main Body | GEC | SEC |
|---|
| Airu Engineering Co.,Ltd | ● | | |
| Asahi Kasei Engineering Corporation | ● | | |
| CHIYODA CORPORATION | ● | ● | ● |
| CHIYODA X-ONE Engineering Corporation | ● | | |
| COSMO ENGINEERING CO., LTD | ● | | |
| Daigas G&P Solution CO.,LTD | ● | | |
| ELTEX Co., Ltd. | ● | | |
| Fujitsu Engineering Technologies Limited | ● | | |
| Hitachi Plant Services Co.,Ltd. | ● | | |
| Idemitsu Engineering Co., Ltd. | ● | | |
| IHI Plant Services Corporation | ● | | |
| Japan Oil Engineering Co., Ltd. | | | ● |
| JFE ENGINEERING CORPORATION | ● | ● | ● |
| JFE Project One Co., Ltd. | ● | | |
| JGC CORPORATION | ● | ● | ● |
| JGC HOLDINGS CORPORATION | ● | ● | ● |
| JGC JAPAN CORPORATION | ● | ● | ● |
| JNC Engineering Co. Ltd. | ● | | |
| JP Steel Plantech Co., Ltd. | ● | | |
| Kaiyo Engineering Co.,Ltd. | ● | | |
| KOBELCO E&M Co., Ltd. | ● | | |
| KOBELCO ECO-SOLUTIONS CO.,LTD. | ● | | |
| Kuraray Engineering Co.,Ltd. | ● | | |
| Kurita Water Industries Ltd. | ● | | |
| MESCO, INC. | ● | | |
| MITSUBISHI CHEMICAL AQUA SOLUTIONS CO.,LTD. | ● | | |
| MITSUBISHI CHEMICAL ENGINEERING CORPORATION | ● | | |
| MITSUBISHI ELECTRIC ENGINEERING COMPANY LIMITED | ● | | |
| MODEC, Inc. | ● | | |
| NIPPON STEEL ENGINEERING CO., LTD | ● | | ● |
| NIPPON STEEL Pipeline & Engineering Co. Ltd | ● | | |
| NIPPON STEEL TEXENG.CO.,LTD. | ● | | |
| Nishinippon Plant Engineering and Construction Co.,Ltd. | ● | | |
| NISSHIN ENGINEERING INC. | ● | | |
| NISSO ENGINEERING CO.,LTD. | ● | | |
| ORGANO CORPORATION | ● | | |
| RAIZNEXT Corporation | ● | | |
| Sankyu Plant Techno Co.,Ltd. | ● | | |
| SUGATEC Corporation | ● | | |
| Taiheiyo Engineering Corporation | ● | | |
| TAKADA CORPORATION | ● | | |
| TEC Project Services Corporation,TPS | ● | | |
| Teijin Engineering Co., Ltd. | ● | | |
| Tokyo Gas Engineering Solutions Corporation | ● | | |
| Tokyo Power Technology Ltd. | ● | | |
| Toray Engineering Co.,Ltd. | ● | | |
| Toshiba Plant Systems & Services Corporation | ● | | |
| TOYO ENGINEERING CORPORATION | ● | ● | ● |
| TSUKISHIMA JFE AQUA SOLUTION CO., LTD. | ● | | |
| TSUKISHIMA KANKYO ENGINEERING Ltd. | ● | | |
| Xenesys Inc. | ● | | |
| ZENI LITE BUOY CO., LTD. | ● | | |
| ZettaJoule, Inc. | ● | | |