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The market response also underscored the limits of buybacks as a tool for controlling borrowing costs, analysts said. Treasury purchases can improve liquidity in older securities and, at the margin, support long-end prices.
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But a $6 billion operation is tiny relative to the roughly $32 trillion Treasury market, analysts said, and does little to alter the broader supply and demand dynamics that have driven yields sharply higher over the last three months. Investors may have also wanted clearer evidence that the $6 billion was a floor rather than a ceiling for future operations.
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Jim Barnes, director of fixed income at Bryn Mawr Trust in Berwyn, Pennsylvania, said investors may have been unnerved by the Treasury's "pro-activeness" in attempting to lower long-dated bond yields, a sign that strains in the Treasury market may be more severe than investors had assumed.
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U.S. debt recently surpassed $40 trillion and monthly fiscal deficits have recently dwarfed federal revenue.
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"The market is probably thinking that with the Treasury looking at this and trying to keep a ceiling on yields, that it's a bigger problem than what we think it is in terms of the deficits and outstanding debt," he said.
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"The $6 billion is not a big amount — it's more the fact they're actively doing it."
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The disappointment also reflects changing expectations around Treasury buybacks. Initially viewed as a tool to improve market liquidity, buybacks are increasingly seen by investors as a potential measure to ease supply pressures in longer-dated maturities.
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But the larger buyback announcement failed to convince many investors that it would materially improve the supply-demand balance in longer-dated bonds.
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For now, the market's response suggests that Treasury faces a high bar to contain yields. A buyback three times larger than its previous operation was not enough to reverse the recent bond selloff, leaving investors to focus on whether Treasury is willing to scale up purchases further as long-term yields rise, or undertake more market-supportive action.
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At the end of the day, market participants believe buybacks are a temporary solution to long-term problems.
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"Treasury buybacks are unlikely to materially alter the diverse forces raising yields, including widening federal deficits, sticky inflation and increased global bond issuance," said Tony Miano, investment strategy analyst at Wells Fargo Investment Institute.
TLT•
