By Matt Wirz 

Not too hot. Not too cold. Just right. Junk bonds started out 2015 with a Goldilocks-like first quarter, as persistently low interest rates kept the market relatively stable, while a selloff in energy-company debt provided ample opportunity for bargain hunters.

Those conditions fed a deal surge as companies rated below investment grade sold $93 billion of new bonds in the U.S., up about 40% from the fourth quarter of 2014, when investor concerns about the energy industry chilled market activity. The benchmark Barclays U.S. Corporate High Yield index returned 2.49%, compared with a 1.17% loss in the previous quarter.

While junk issuance rebounded from the fourth quarter, it fell short of a record. The dollar value of U.S. bond sales by investment-grade companies rose to a new all-time high in the first quarter, driven by low rates and corporate deal making.

Part of the gains for junk bonds can be attributed to growing complacency among investors about the risk that the U.S. Federal Reserve will raise interest rates in the near term. Bond yields typically rise, making prices fall, in anticipation of a rate increase, but U.S. Treasury yields declined this year, as expectations of an increase faded.

Falling yields boosted prices of existing bonds and prompted companies to keep issuing bonds while the cost of borrowing remained cheap. "We thought the refinancing trade by borrowers would dissipate with rising rates, but it continues," says Stephan Jaeger, co-head of leveraged-finance capital markets at Bank of America Merrill Lynch.

Early in the year, such deals were dominated by high-yield blue chips like HCA Holdings Inc. and H.J. Heinz Co. Less-stable borrowers started to tap the markets in mid-February, when investors recovered their appetites for risk.

Junk bonds tumbled in the second half of 2014 as oil prices fell by almost half. That raised concerns that energy firms--which Standard & Poor's Ratings Services says make up 9% of U.S. companies with high-yield ratings--would struggle to repay their debts. Bonds of energy companies with higher credit ratings, like California Resources Corp., fell to 80 cents on the dollar. Debt prices for lower-rated issuers, like EXCO Resources Inc., fell to 55 cents.

Bargain investments have been hard to find in recent years, as low interest rates have helped pump stock and bond prices to records. For many fund managers, the turmoil caused by low oil prices is like water in the desert.

"It's been a good market for us," says Andrew Susser, who runs a $21 billion portfolio of high-yield bonds for MacKay Shields, a unit of New York Life Insurance Co., and owned few energy bonds in December. He has since bought in at discount prices. "We've slowly dialed up the risk the last couple of months."

When oil-producer Comstock Resources Inc. issued a $700 million bond to pay off loans and pad its cash cushion in early March, MacKay Shields was one of the funds that bought in, for a price. Comstock agreed to pay investors a 10% annual yield on the bonds, which are secured by the company's assets.

Such risk premiums are increasingly rare in fixed-income markets across the globe. The European Central Bank's initiation of a bond-buying program, or quantitative easing, to stimulate economic activity has pushed yields on European bonds to record lows, with the German government selling five-year bonds at negative yields for the first time.

One side effect of Europe's lax monetary policy: The money that fled U.S. high-yield bonds last year has started to flow back in. Investors poured about $9 billion into junk-bond mutual funds and exchange-traded funds in the first three months of the year, partially offsetting the $12.75 billion they took out in the second half of 2014.

In contrast, investors continue to yank money out of funds that buy so-called leveraged loans made to companies rated below investment-grade. Leveraged loans returned about 2.3% through March 30, according to Barclays, comparable to the performance of high-yield bonds. Nevertheless, investors pulled about $3.24 billion from funds that buy the loans, adding to outflows of about $17.58 billion in the second half of last year, according to Lipper.

Because loans pay variable interest that moves in tandem with prevailing interest rates, individual investors view them largely as a hedge against rate increases by the Fed. Anticipation of such a move prompted record inflows of $70 billion in 2013, according to S&P Capital IQ LCD, but when the feared rise in rates failed to materialize, investors started to lose interest.

"Collectively, we've cried wolf one time too many," says Frank Ossino, a loan-fund manager at Newfleet Asset Management LLC. "There's a large investor community that only buys loan funds when rates go up."

Write to Matt Wirz at matthieu.wirz@wsj.com

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