| Client name | City | Country |
|---|---|---|
| MAN Energy Solutions China Production Co.,Ltd. | Changzhou | China |
| MAN Energy Solutions India Private Limited | Bengaluru | India |
| MAN Energy Solutions Schweiz AG | Zürich | Switzerland |
| MAN Energy Solutions SE | Oberhausen | Germany |
| MAN GHH | Geisenheim | Germany |
| MAN Gute Hoffnungshütte AG | Oberhausen | Germany |
| Manfred Renz Medientechnik GmbH | Engerwitzdorf | Austria |
| Mangalore Refinery and Petrochemicals Limited | Mangalore | India |
| Mangan Inc. | Sugar Land | United States |
| Mankenberg GmbH | Lübeck | Germany |
| Mannesmann Demag Hüttentechnik | Mönchengladbach | Germany |
| Märkische Faser AG | Premnitz | Germany |
| Martin GmbH | München | Germany |
| Martinswerk GmbH | Bergheim | Germany |
| Maschinenbau Scholz GmbH & Co. KG | Coesfeld | Germany |
| Maschinenfabrik Neuman & Esser GmbH & CoKG | Übach-Palenberg | Germany |
| MASCOT industrial tech (Shanghai) Co., Ltd. | Pu Dong New Distric, ShangHai | China |
| Matek Samson Regulering AS | Skien | Norway |
| MATTECH, s.r.o. | Ostrava - Poruba | Czech Republic |
| Max-Air Technology Inc | Wentzville | United States |
| Maximator Hydrogen GmbH | Nordhausen | Germany |
| MB ENGINEERING S.R.L | Ravenna | Italy |
| McDermott | Brno | Czech Republic |
| McPhy Energy Deutschland GmbH | Wildau | Germany |
| ME Engineering GmbH | Marl | Germany |
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