German lender Commerzbank AG (CBK.XE) Thursday sold its first covered bond backed by loans made to small and medium-sized companies, a deal that may be seen as a test case for securing this type of debt against nontraditional assets in the euro zone region.

The 500 million euro ($669.2 million), five-year bond priced at 0.47 percentage point over the reference midswaps rate, a benchmark, and will carry a coupon of 1.5%.

By contrast, German peer Berlin-Hannoversche Hypothekenbank AG at the end of last month sold a 1.125% five-year mortgage-backed covered bond at 0.01 percentage point under midswaps. The figures highlight the difference in compensation investors demand according to the type of collateral the debt is secured against.

Covered bonds are traditionally backed by highly-rated mortgages or public-sector loans, and are widely considered the safest debt banks sell. This is because not only are they typically protected by special legislation, they offer double security: if a bond defaults, investors have a claim on the bank as well as the assets.

But even though the Commerzbank bond is structured to resemble a covered bond, because it is secured against business loans, it isn't bound by covered bond law. That could prove a sticking point for some money managers.

"This is not really a covered bond," said Georg Grodzki, head of credit research at Legal & General Investment Management. "It will be interesting to see how it will trade but it may struggle to gain broader acceptance in the absence of any preferential regulatory treatment."

The fact the bond will essentially turn into a collateralized loan obligation--a type of debt that fell out of favor with investors in the wake of the subprime crisis--if the issuing bank failed, may also deter potential buyers, Mr. Grodzki said.

Still, because the loans in the cover pool were made to German companies, investor demand was robust, with order books in excess of GBP1 billion and more than half of the bonds sold outside of Germany, the bank said.

The high demand for the deal demonstrates the appeal of the German "Mittelstand'--a reference to small and medium-sized companies--for investors, said Holger Werner, divisional director of strategy and projects at Commerzbank's Mittelstandsbank unit.

While Commerzbank's bond is the first structured deal of this kind out of Germany, HSH Nordbank AG last year sold a public-sector covered bond that was backed by loans made by German development bank KFW to small and medium-sized companies, or SMEs. Because those loans were guaranteed by KFW, the bond fell under covered bond law.

Turkish lender Sekerbank TAS has also previously sold covered bonds secured against SME loans, but it remains a relatively niche product given the lack of regulatory support.

A sizable SME covered bond market is unlikely to emerge, said Bernd Volk, head of European covered bond research at Deutsche Bank.

Commerzbank's deal Thursday follows a relatively barren spell for covered bond issuance in Europe. Banks selling covered bonds in euros had before Thursday raised about EUR3 billion this month, the lowest at this stage in February on record, Dealogic data show.

Euro-denominated covered bond supply fell to EUR126 billion in 2012, almost half of what was sold the previous year and the lowest in the single-currency era, Dealogic said.

Barclays PLC, Commerzbank, Credit Agricole SA, and UniCredit SpA were the banks running Thursday's sale. The bond is expected to be rated Aa2 by Moody's Investors Service and AA by Fitch Ratings.

Write to Ben Edwards at ben.edwards@dowjones.com

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