Collective action is an effective way for nonprofits to increase their impact, but they often lack the key capacities that enable these types of partnerships to thrive. Nonprofits need time and space to explore and employ the power of collective action to advance their missions. They also need organizational slack, and board and staff leaders who are adept at building relationships and sharing power and responsibility. Grantmakers can play a vital role in creating the space for collaboration and supporting nonprofits as they work together to get better results. This piece offers insights on the core capacities nonprofits need to collaborate and how funders can help.