By Patrick McGee and Katy Burne

Yields on "junk"-rated corporate bonds reached their lowest point on record, according to Barclays.

The Barclays high-yield index, a benchmark index of below-investment-grade bonds which goes back to 1983, fell to a record low 6.6073% at Thursday's close, marking a 0.13 percentage point drop in the past week. Bond yields fall as prices rise.

The final push into record territory came after European Central Bank President Mario Draghi outlined Thursday how the central bank would buy short-term bonds from struggling European nations if they asked for help. Mr. Draghi was delivering on a promise he made in late July to do "whatever it takes" to save the euro. The aggressive action was interpreted as a necessary move to save distressed euro nations and served as a green-light for investors to purchase riskier assets such as junk bonds and equities.

Investors have also bought risky assets as expectations grow for the Federal Reserve to announce bond-buying plans of its own at the central bank's next policy meeting, which concludes on Sept. 13.

The previous record-low yield of 6.61% was set in May 2011, shortly before Greece's debt problems worsened, touching off over a year of worries that faltering euro zone economies would trigger a global credit crunch.

"The market has heard what it wanted to hear out of central bankers and has responded accordingly," said Sean Slein, portfolio manager of New York-based First Eagle Investment Management, who oversees $600 million of junk bonds.

Mr. Slein said he thinks valuations in junk bonds are fair for now.

But some market participants said the junk-bond rally may be nearing its limit.

Andrew Feltus, fund manager at Pioneer Investment Management Inc., said the case for buying more junk bonds is becoming increasingly difficult with yields so low. He said stocks are relatively cheap by comparison.

U.S. junk bonds have delivered a total return of 11.05% this year, versus 13.88% for the S&P 500 stock index. Total return includes coupon payments and capital appreciation.

Falling yields helped drive junk-bond sales to a record high for August, and issuance remained strong into September.

Fashion accessories chain Claire's Stores sold $625 million of new bonds Thursday offering a 8.49% yield. Already the yield on those bonds has dropped to 8.09% in secondary-market trading, according to data provider MarketAxess.

Issuance is $205.66 billion so far this year, edging out the $205.64 billion issued to this point last year, according to Dealogic data. Much of the new issuance is from companies replacing older, higher-yield debt, according to Citigroup Inc.

Mr. Feltus said he is concerned about the rise of what he called "engineered deals," when a company tries to issue as much debt as it can without sacrificing its current ratings.

"People are thinking, 'How aggressive can I be?'" he said.

Write to Patrick McGee at patrick.mcgee@dowjones.com and Katy Burne at katy.burne@dowjones.com

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