Commercial mortgage-backed securities have been on somewhat of a roller-coaster ride these past few months, but they remain relatively positive given growing investor concern about the European debt crisis, Trepp analytics said this week.

The research firm said U.S. stocks faltered, but CMBS still advanced.

Last week, the CMBS research firm said spreads on commercial mortgage-backed securities narrowed after the Labor Department released an improved jobs report.

This week, Trepp says legacy senior bonds tightened 1 basis point over swaps this week. In addition, the benchmark GSMS 2007-GG10 A4 bond finished 206-basis points over swaps, or two-basis points tighter.

"CMBS trading was very active, with bid list volume hitting $700 million," Trepp noted.