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| Maritim Start AS | Stokke | 2016 |
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| Maritime Essentials AS | Nøtterøy | 2025 |
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| Maritime Invest AS | Brandal | 1998 |
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| Marius Board B2B AS | Flateby | 2026 |
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| Markant Agency AS | Sponvika | 2023 |
| Markant Energy Norge AS | Oslo | 2020 |
| Markant Gruppen AS | Oslo | 2021 |
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| Markedshuset Invest AS | Tromsø | 2013 |
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