The securities drew a yield of negative 0.55 percent, the same as the average forecast in a Bloomberg News survey of 7 of the Fed’s 18 primary dealers. The sale was a reopening of an $11 billion offering in April. Conventional Treasury notes erased gains amid speculation on the amount of debt the Fed may buy to spur the economy in a tactic called quantitative easing.

“It signals people’s expectation of the Fed being able to create some inflation with the QE program,” said Alex Li, an interest-rate strategist in New York at Deutsche Bank AG, which as a primary dealer is required to bid at Treasury auctions. “With nominal rates so low, in order have high TIPS breakevens you’ve got to have negative real yields on the five-year.”