US funding markets see $120B influx as structural shifts reshape bank liquidity

Money market funds pulled in $120 billion this month, a figure that underscores just how aggressively capital is rotating into the safest corners of the financial system. Structural changes at large banks are reshaping how liquidity moves through the US funding ecosystem.

For context, total money market fund assets now stand at roughly $7.77 trillion, according to Investment Company Institute data for the week ending May 20, 2026.

The numbers behind the surge

During that single week ending May 20, MMF assets grew by $16.88 billion. Government taxable funds accounted for $16.34 billion of that increase, meaning virtually all the weekly growth came from one category.

Earlier in 2026, March saw net inflows of $148.5 billion into money market funds, marking the third-largest weekly inflow on record. The Federal Reserve has tracked MMF growth climbing from $7.2 trillion to $7.9 trillion by early 2026, with government funds doing the heavy lifting.

Why banks are pushing liquidity outward

Post-2023 banking stress, institutions have been recalibrating their balance sheets with an eye toward liquidity coverage ratios and supplementary leverage constraints. When holding certain deposits becomes more expensive from a regulatory capital perspective, banks have an incentive to redirect that cash elsewhere. Money market funds are the natural landing pad, offering competitive short-term yields, investing primarily in government securities and repurchase agreements, and providing daily liquidity that institutional investors demand.

The crypto connection you didn’t expect

Tether, the largest stablecoin issuer, reported exposure to US Treasuries nearing $120 billion as of Q1 2025. That makes Tether one of the larger holders of short-term government debt globally, sitting alongside sovereign wealth funds and major asset managers in the Treasury auction ecosystem.

Both MMFs and stablecoin reserves are essentially doing the same thing: warehousing short-duration, high-quality liquid assets to back claims that investors can redeem on demand. Meanwhile, tokenized money market fund products have been expanding throughout 2025 and 2026, with several major asset managers building products that represent MMF shares as on-chain tokens to unlock 24/7 settlement, programmable treasury management, and composability with decentralized finance protocols.