The 50 most-backed pension & retirement funds 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, International City Management Association Retirement Corporation, and Knickerbocker Edens Llc.
Ranked by sector centrality (ImpactRank over the funder graph).