U.S. MMFs’ Updated for Reverse Repos: for the end of May, ($479 billion in overnight RRPs). Of them, 80% ($384 billion) were with just five financial institutions.

Fidelity ($195 billion), Goldman Sachs ($60 billion); Morgan Stanley ($44 billion), JP Morgan ($43 billion), and Blackrock ($42 billion)

https://www.financialresearch.gov/money-market-funds/us-mmfs-repos-with-the-federal-reserve/

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