Sales of U.S. corporate bonds rose for the second straight week,the first back-to-back gain in three months, as borrowers tookadvantage of tightening relative yields.

AT&T Inc., the largest U.S. phone company, and Louisville,Colorado-based Zayo Group LLC led borrowers issuing $17.4 billion,a 6 percent increase from the five days ended June 8, according todata compiled by Bloomberg. The extra yield investors demand tohold corporate debt rather than Treasuries with similar maturitiesnarrowed 3 basis points this week through yesterday to 315 basispoints, or 3.15 percentage points, according to Bank of AmericaMerrill Lynch's U.S. Corporate & High Yield Master index.

Symantec Corp. joined AT&T as sales reached $6.9 billion onJune 11, the busiest start to a week in more than two months. Whileissuers rushed to the market on growing optimism that financialcontagion can be contained following Spain's request for a 100billion euro ($126 billion) bank bailout, the pace slowed inadvance of elections on June 17 in Greece that may determine thefuture of the euro zone.