Sovereign wealth funds control nearly $10 trillion outside their home markets, yet only a fraction reaches external managers. Norway’s NBIM outsources 5%, Saudi’s PIF a sixth, while more than half of Kuwait’s assets and over 60% of China Investment Corp’s overseas holdings are tendered to outside firms. The sheer scale makes these funds attractive despite political controversy.

Researchers combed through U.S. Form ADVs to estimate how much external money flows to the world’s biggest managers. Franklin Resources emerged with roughly $66bn of segregated sovereign‑wealth mandates, and aggregating the top 20 firms yields just over $1tn in reported assets. Gaps remain because many firms outside the U.S. do not file ADVs, and pooled‑fund reporting obscures true exposure.

BlackRock appears to be the only manager that disaggregates official‑institution holdings in its regular reports, listing $348 bn for central banks, sovereign funds and similar entities—more than double the sum derived from segregated mandates. The fragmented data picture hampers investors seeking transparency on who controls sovereign wealth, leaving a sizable blind spot in the asset‑management industry.