Treasury bill ETFs attract $51B in inflows as investors shift away from long-term bonds

The bond market’s version of a flight to safety doesn’t look like it used to. Instead of piling into long-dated Treasuries, investors are cramming into the shortest-duration instruments they can find. Treasury bill ETFs, funds that hold government debt maturing in three months or less, have pulled in roughly $51 billion in inflows as money managers trade duration risk for something that behaves a lot more like a high-yield savings account.

The poster child for this trend is BlackRock’s iShares 0-3 Month Treasury Bond ETF, ticker SGOV. The fund has attracted approximately $49 billion in net inflows, with assets under management now exceeding $104 billion. On its busiest day in early June 2026, SGOV absorbed $1.8 billion in a single session.

Why investors are hugging the short end of the curve

Funds like the SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) offer yields around 3.5% on a 30-day SEC basis, with bid-ask spreads as tight as 0.01%. That means investors are getting competitive returns with virtually no price volatility and almost zero trading friction.

Meanwhile, the long end of the bond market has been getting punished. The iShares 20+ Year Treasury Bond ETF (TLT), the most widely held long-duration Treasury fund, has seen $15 billion in outflows since September 2024.

The product arms race in ultrashort bonds

The three biggest asset managers in the world are all competing for this wave of cash. BlackRock’s SGOV dominates the category, but State Street’s BIL remains a major player, and Vanguard entered the fray with its 0-3 Month Treasury Bill ETF (VBIL), which has been rapidly accumulating assets since launch.

The broader ultrashort bond and T-bill ETF categories hit record-breaking monthly inflows in March 2026, underscoring just how durable this rotation has become.

These ETFs closely track the Federal Reserve’s policy rate, which means their yields adjust quickly when the Fed moves. For corporate treasurers managing cash positions, or for advisors looking to park client assets between allocation decisions, T-bill ETFs function as a near-perfect cash substitute with the added benefit of Treasury-level credit quality.

What the shift signals for broader markets

As money flows out of long-duration products, it puts upward pressure on long-term yields, which in turn raises borrowing costs for the US government, corporations, and homebuyers. The 10-year and 30-year Treasury yields don’t just affect bond traders. They ripple through mortgage rates, corporate financing decisions, and equity valuations.

The expansion of product offerings from BlackRock, State Street, and Vanguard in the ultrashort category suggests these firms see structural demand, not just a cyclical trade.

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