The 50 most-backed membership organizations in the United States are ranked by their centrality in the sector's funding network — a measure of how embedded they are through grants received, board connections, and shared funders.
The largest are Young Mens Christian Association Retirement Fund, Central Midwest Regional Council Of Carpenters Welfare Fund, and Leisure Care Health Benefits Trust.
Ranked by sector centrality (ImpactRank over the funder graph).