[en] On the occasion of the 4. edition of the Change Now Summit in Paris from 27 to 29 May, the French Association 'Entreprises pour l'Environnement' (EpE) is releasing the first report of its Ocean Commission set up in late 2018. This publication draws on concrete examples to show how businesses are reducing their impact on the oceans, and offers replicable, marine science-based best practices. EpE members believe we could do more with enhanced sea governance and increased cooperation between private and public actors. From the outset, the report argues that protecting the ocean does not concern only 'sea professionals' (sailors, fishermen, ship owners, etc.), but has to involve all economic stakeholders that directly or indirectly impact or are impacted by climate, biodiversity, resource and health issues. This publication, based on earlier sea-focused works carried out by EpE businesses (manufacturers, energy providers, insurers, banks,...) in cooperation with international bodies and scientists, presents the issues and currently available enhanced sustainable management solutions, including land-based prevention of pollutant discharges and plastic waste, restoration of marine and coastal ecosystems, spatial monitoring of vessel movements, fish stocks and ecosystem health, infrastructure adaptation, decarbonization financing, and so on. Businesses are engaged in dialogue with their value chains, the scientific community and their stakeholders to roll out solutions on a much larger scale, while managing conflicts of use often through management schemes that balance uses to save space and optimise resources. The idea that ocean challenges are of a fundamentally collective nature, from use planning to solution development, is gradually gaining ground. Many of the business practices described in the report illustrate this point. Corporate players believe that closer coordination with governments on territorial and non-territorial waters is called for in order to foster viable and fair economic models in what is the most competitive environment of all. Regulation of land-sea interfaces, reduction of research risk, better use of public procurement, quantification of objectives, promotion of cooperative projects, and greater regulatory compliance are some of many levers available to public institutions to boost private-sector action. The other issue this report raises is how the complexity of governance in what are immense expanses of water is hindering protection of our common heritage. Indeed, the governance of maritime areas is characterised by multiple spaces (land-sea interfaces, territorial or extraterritorial waters), each with varied, even disparate, environmental standards. In such a context, voluntary actions are particularly important in harmonising practices, as well as in guiding and supplementing public action. The contributors to this publication emphasise the importance of effective implementation of maritime transport conventions, of factoring climate change adaptation into ocean governance, and of improved cooperation among States to ensure proper enforcement of existing conservation arrangements.