Thursday's sale was already unusually large for the nonagency mortgage bond market, which this year has seen a daily average of about $1 billion in bonds offered, according to Empirasign Strategies, a trade database.

The auction -- mostly securities backed by ALT-A loans, a type of mortgage that typically didn't require documentation such as proof of income -- is the biggest widely marketed sale of securitized debt in at least three years, according to data provider Empirasign Strategies LLC.

Supply of non-agency RMBS on the secondary market has picked up in May, with more than $12.4 billion hitting screens, according to Empirasign Strategies.

The assets are a mixture of risky residential mortgage-backed securities issued by Wall Street banks before the financial crisis, according to Empirasign Strategies, a trade database.

The auction is the biggest widely marketed sale of securitized debt since at least March 2010, according to Empirasign Strategies LLC, a New York-based provider of data on securitization-market trading. Eight of the 10 largest auctions were sales by the Federal Reserve of debt acquired from Bear Stearns Cos. and American International Group Inc. during the crisis.

The bonds are scheduled to trade at 11:00 am EDT on Tuesday next week, according to Empirasign Strategies.

May is set to be the busiest month of the year for trading in AJ bonds, said Empirasign Strategies, a trade database.

May is on track to be the busiest month for mezzanine CMBS trading since February, said Adam Murphy, CEO of Empirasign Strategies, which compiles trading data across securitized products. "Higher prices are drawing out the fast money sellers. Sell in May and go away has not worked in stocks. Maybe it will work in CMBS mezzanine trading," he added.

And despite a heavy supply of bids-wanted-in-competition—about $900 million in CLO BWICs were seen this week alone, according to data provider Empirasign—the rally continues.

Weekly trading in BB-rated bonds shot up as high as $2.4 billion in October, second only to April, when the New York Fed was unwinding a massive portfolio of crisis-era assets, according to Empirasign Strategies. It has averaged $1 billion a week this quarter, twice that of the third quarter, the firm's data said.

Asset-backed securities trading in the secondary market is poised to bounce back following wider disruptions in the wake of Hurricane Sandy this week. The U.S. bond market was closed for a day and a half and some buyside and sellside firms were operating on truncated manpower, all but squashing secondary trading volumes last week. "It looks like we're back to about two thirds of a normal trading session, or 85% when you look at today's trading versus a normal Monday," said Adam Murphy, president of Empirasign Strategies.

More than $7.87 billion of CDO liquidations across 33 lists have taken place this year, according to data provided by Empirasign Strategies. In 2011, $12.55 billion in CDO liquidations were offered up, across 57 lists.

The total comprises six lists, including one $223.4 million list of primarily 2006 and 2007-vintage mezzanine and subordinate bonds, according to data provider Empirasign Strategies.

Investors have sought bids on $4.25 billion of debt linked to everything from skyscrapers to strip malls the past week, 64 percent more than the average weekly volume in 2012, according to Empirasign Strategies LLC, a New York-based data provider.

Bonds came from deals issued by Credit Suisse Asset Management, GoldenTree Asset Management, and Whitehorse Capital Partners among others, according to Empirasign Strategies, a firm that gathers and publishes BWIC data.

Dealers circulated 278 lists of non-agency securities last week in auctions for investors known as "bids wanted in competition," totaling $21.3 billion in face value, the largest amount of debt and fourth-most lists this year, according to New York-based Empirasign, a provider of trading information.

Activity has been lighter this week, but there are a lot of compounding issues: Greece headlines, the holiday weekend and the Fed. I also think JPMorgan's [credit default swap] exposure may be hanging over the market, making people more risk averse,

"The actions of the NY Fed really do not square with those who are anticipating a QE3," said Adam Murphy, President of Empirasign Strategies. "The Fed's unwinding of Maiden Lane is effectively quantitative tightening, not easing, because it's taking money out of the system not putting it in," he added.

Morgan Stanley and at least three other dealers are seeking bids on $1.5 billion in collateralized debt obligations backed by commercial real-estate bonds for the owner, UBS AG (UBS, UBSN.VX), according to Empirasign Strategies, which tracks securitized-debt trading, and a UBS spokeswoman. The sale comes just days after the Federal Reserve Bank of New York captured the market''s attention by auctioning $7.5 billion of similar securities.

Bid lists for "AJ" and slightly safer "AM" CMBS since April 16 has dropped to as little as $12 million in a day in the past week, compared with $100 million to $300 million per day earlier this month, according to Adam Murphy, president of Empirasign Strategies, which tracks trading in CMBS.