The set of stakeholders should include anyone with an interest in the project and its outcomes. This should include the business owners, you, the project team, the clients, and quite likely the public and others. Careful consideration of who the stakeholders are will help you to develop a more thorough communication plan and other project plans. If your company projects are around products, you need to consider the product marketing and messaging, for example. You may not be the person to create it, but someone needs to.