Commercial mortgage-backed securities are seeing the tightest spreads of 2025, a shift Trepp attributes to strong investor appetite and sustained discipline from issuers. The rally, which has pushed spreads on new conduit deals to levels last seen in January, is providing lenders room to lower loan coupons without cutting into profitability.
In its latest market commentary, Trepp highlighted a recent $741.52 million conduit transaction backed by eight lenders. The deal’s benchmark AAA class, carrying an average life of about five years, was priced at 78 basis points over the interpolated Treasury curve. That marked a sharp improvement from April, when AAA spreads stood at 108 basis points, and well below the roughly 125 basis points seen during the middle of 2023. Just two years ago, Trepp noted, AAA bonds in conduit deals were pricing as wide as 148 basis points in August 2023. Against 10-year Treasuries, spreads were near 230 basis points at that time, compared with 87 basis points today.
The tightening trend underscores how lenders are requiring smaller risk premiums over base rates. “This volatility does not necessarily signal instability,” wrote Orest Mandzy, managing editor at Trepp’s Commercial Real Estate Direct. “It reflects the relatively small loan pools that influence week-to-week prints, particularly when issuance is light.” Trepp data showed median debt service coverage ratios at securitization ranging from 0.61x to 3.52x, a wide but manageable range given the thin pipeline of deals.
But the spread tightening has come against a backdrop of shrinking conduit issuance. Only $354 million in conduit CMBS were priced in August 2025, the lowest monthly total in the past year, according to Trepp. That compares with $869.8 million in July, $2.4 billion in June and $2.1 billion in May. Activity earlier in the year was only marginally stronger, with monthly volumes ranging from $1.7 billion to $3.2 billion between January and April.
Single-asset, single-borrower (SASB) issuance has been more active and uneven in pace. Trepp reported SASB deal flow swinging from as little as $2 billion in April 2025 to as much as $18.1 billion in February. Recent months have also seen robust volumes, with $10 billion in June, $7.8 billion in July, and $8.7 billion in August.
While issuance has slowed, the tightening of CMBS spreads signals that investors remain committed to the product and lenders continue to benefit from favorable pricing dynamics not seen since early 2025.
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