(Bloomberg) -- Sales of corporate bonds in the U.S. are surging toward the busiest May ever as borrowers race to the market before demand dries up with Bill Gross and Warren Buffett cautioning against buying debt at all-time low yields.

Petroleo Brasileiro SA’s $11 billion deal, the biggest on record for an emerging markets issuer, leads sales this month of $120.2 billion, on pace to exceed the unprecedented $162.6 billion sold in May 2008, data compiled by Bloomberg show. Issuance has already eclipsed the $108.2 billion sold in all of May 2012.

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