By Bryan Keogh April 8 (Bloomberg) — High-yield, high-risk bonds make up the biggest share of corporate debt sales on record as investors wagering on a robust economic recovery snap up securities from even first-time issuers. Global sales of junk bonds total about $91 billion this year, or 12 percent of issuance, almost double last year’s share, according to data compiled by Bloomberg. Yields on the debt fell to within 5.83 percentage points of Treasuries this week, about the lowest level since December 2007 and down from a spread of 6.66 percentage points at the end of 2009, Bank of America Merrill Lynch’s Global High Yield Index shows. Economists are boosting their forecasts for economic growth this year, as narrower bond spreads cut borrowing costs to pre- credit crisis levels, helping the riskiest companies to sell debt as the risk of default eases. Radiation Therapy Services Inc., the Fort Myers, Florida-based operator of cancer-treatment centers, is planning to raise $310 million in its inaugural bond offering, while American Residential Services LLC is offering its first notes in 13 years, Bloomberg data show. “Most of the major concerns seem to be gone,” said James Lee , fixed income analyst at in Bethesda, Maryland-based Calvert Asset Management, which manages about $15.5 billion. “It’s a self-fulfilling cycle. Cash is coming into high-yield and high- yield managers are putting cash to work, helping borrowers rollover their debt, he said. Sallie Mae Sale Elsewhere in credit markets, global issuers poised for credit-rating downgrades fell to 694 from a record 1,028 a year ago, Standard & Poor’s said. Commercial paper outstanding dropped to the lowest in three months, the Federal Reserve said. U.S. mortgage rates jumped to the highest level in almost eight months, mortgage finance company Freddie Mac said. SLM Corp. , the student lender known as Sallie Mae, plans to issue $1.22 billion of bonds backed by student loans. The decrease in the number of issuers poised for cuts is largely the result of outlook revisions to “stable” as credit quality improves, New York-based S&P said today in a report. Potential downgrades are borrowers that have either a “negative” outlook or ratings on review with negative implications across the AAA to B categories. markets began to bottom out and slowly move toward stabilization. “The consumer products, automotive, and banking sectors had the largest changes in negative bias this month,” Diane Vazza , head of S&P’s global fixed income research, said in a statement. Commercial Paper Falls Commercial paper outstanding declined for fourth straight week, the Fed said today on its Web site . The market for short- term IOUs fell $19.6 billion to $1.09 trillion in the week ended April 7, the lowest since Jan. 6, according to data compiled by Bloomberg. Without seasonal adjustment, outstanding commercial paper dropped to $1.07 trillion, the lowest level since the period ended June 10, 1998, when it stood at $1.066 trillion. Rates for 30-year fixed mortgages rose to 5.21 percent for the week ended today from 5.08 percent, Freddie Mac said today in a statement. That’s the highest rate since the period ended Aug. 13. The average 15-year rate was 4.52 percent, according to the McLean, Virginia-based company. Loan rates are climbing from record lows last year as the economy shows signs of strengthening and after the Fed completed a program of buying about $1.25 trillion of securities backed by home loans . Rising borrowing rates and the expiration of homebuyer tax credits this month may reduce demand for homes. Student-Loan Bonds Sallie Mae ’s planned debt offering would be the largest sale of asset-backed securities since the U.S. withdrew its support of the market. The loans underlying the bonds carry government guarantees, according to a person familiar with the transaction, who declined to be identified because terms aren’t set. The top-rated portion maturing in 3.34 years may yield 40 basis points more than the one-month London interbank offered rate, the person said. The global economy will expand 3.6 percent this year and 4 percent in 2011, according to the median estimate of 51 economists surveyed by Bloomberg. Six months ago, economists forecast 2.9 percent growth this year. Apollo Management LP and Sankaty Advisors LLC are bidding on $4.3 billion of high-yield, high-risk loans managed by Stanfield Capital Partners LLC, according to three people with knowledge of the situation. Stanfield, a New York-based money manager, sought offers in February for the debt, which is packaged inside 12 collateralized loan obligations, said the people, who declined to be identified as the negotiations are private. Berkshire Capital Securities LLC is arranging the sale. A benchmark indicator of U.S. corporate credit risk erased an early rise as European Central Bank President Jean-Claude Trichet said he doesn’t expect Greece to default on its debts. The Markit CDX North America Investment Grade Index Series 14, which investors use to hedge against losses on corporate debt or to speculate on creditworthiness, fell 0.49 basis point to a mid-price of 86.88 basis points as of 4:53 p.m. in New York, according to Markit Group Ltd. Junk Bond Sales The index had earlier risen to 90 basis points, the highest since Feb. 26, according to CMA DavaVision. The gauge typically falls as investor confidence improves. Global sales of junk bonds were $210 billion in 2009, or 6.6 percent of all corporate offerings, Bloomberg data show. The previous high was in 1999 at 8.9 percent. In the U.S., companies have sold $74 billion of high-yield debt, a record 22 percent of the overall market, compared with 13 percent in 2009. Non-investment grade bonds are rated below Baa3 by Moody’s Investors Service and less than BBB- by S&P. First-time issuers sold about $14.8 billion of junk bonds in the U.S. last quarter, following $20.1 billion in the three months ended in December, according to Citigroup Inc. New Issuers Welcome Investors’ appetite for high-yield bonds from issuers tapping the corporate debt market for the first time is allowing companies to replace bank debt, pay for acquisitions and fuel growth, said Peter Aherne , head of North America capital markets at Citigroup in New York. “The credit markets have been incredibly receptive to first-time issuers,” Aherne said. “These issuers tend to get a relatively strong reception because investors are open on the credit and they tend to ascribe a significant amount of value to the opportunity to diversify their portfolios.” Junk bonds yield on average 8.59 percent, the lowest since October 2007, when the S&P 500 Index of stocks began a 57 percent drop from a record high, Bank of America Merrill Lynch index data show. Spreads reached a 16-month low of 5.77 percentage points on April 6. The extra yield investors demand to own investment-grade bonds rather than government debt widened 1 basis point today to 148 basis points, according to Bank of America Merrill Lynch’s Global Broad Market Corporate index. Junk Returns Junk bonds have returned 6.08 percent this year, compared with 2.86 percent for investment-grade debt, Bank of America Merrill Lynch index data show. The 12-month global default rate for high-yield debt fell to 9.9 percent in the first quarter, from 13 percent at the end of 2009, according to Moody’s. The rate will drop to 2.8 percent by year-end, then decline to 2.4 percent by next April, the New York-based ratings company predicted in a report. That’s lower than the 3 percent rate it forecast in February. “Default outlooks are constantly being revised lower,” said Paul Owens , a credit analyst at Liontrust Investment Services Ltd. in London, which had the equivalent of $1.8 billion under management as of Dec. 30. “From an investor’s point of view, spread, solid businesses and a sanguine risk outlook come together in a sweet spot for high yield.” NES Rentals Holdings Inc. raised $250 million on April 1 in its first bond offering, Bloomberg data show. The 12.25 percent senior secured notes due in 2015 priced to yield 993 basis points more than Treasuries. ‘Currently Resilient’ “High yield bonds are currently resilient in the face of the Greek woes, with investors focusing on good company fundamentals,” said Alex Moss , a fund manager at Insight Investment Management in London. “High-yield companies are also posting very decent financial results and largely focusing on balance sheet management, which will help in the case of a double dip in the economy, helping to preserve cash.” Radiation Therapy’s $310 million of subordinated notes due in 2017 may yield 10 percent to 10.25 percent and price as soon as today, according to a person familiar with the offering. Private equity firm Vestar Capital Partners agreed to buy the Fort Myers, Florida-based company in 2007. American Residential plans to sell $150 million of five- year senior secured notes this week to repay debt, offering a yield of about 11.75 percent, according to a person familiar with the offering who declined to be identified because terms aren’t set. The Houston-based heat and air conditioning servicer may use the proceeds from the offering to repay existing debt, the person said. “Spreads on investment-grade bonds just aren’t paying enough, so people are reaching for a little bit more yield,” Owens said. To contact the reporter on this story: Bryan Keogh in New York at bkeogh4@bloomberg.net