Spreads remained tight later in the month as well. On 31 August a USD 16m WBCMT 2007- C33 AJ with exposure to the 666 Fifth Avenue New York City tower covered at 102-18, after being talked at prices in the 100-102 range, according to Empirasign.

Price talk ranged from more than 75 cents on the dollar to mere pennies on some of the bonds out for bid, according to trade data company Empirasign.

... a $6 million piece of a deal Bank of America issued in 2004 changed hands on June 6 after hitting the secondary market at an above-par price, according to Empirasign.

"Investors in every other market get to see what they are buying -- but not mortgage bond investors," said Adam Murphy, founder of Empirasign Strategies LLC, a trading data firm for mortgage bond professionals. "I believe in privacy rights, but investors should be able to drive by the properties if they want."

BWICs in European ABS trading, which account for lots of the trading activity in more unusual assets, already have their own "electronic" marketplace in the form of Empirasign, which posts upcoming BWICs, cover levels, and most recent trading levels. It's not an execution venue, but it is much better than emailing or instant messaging BWIC annoucements, cover and colour in different, incompatible formats from every trading desk.

About US$213m of SFR bonds appeared on a bid list for sale Monday after investors learned some Blackstone bonds would be repaid as part of the Invitation Homes IPO. According to data provider Empirasign, it was the biggest day of bid list activity for SFR bonds since October 2015.

According to Empirasign, the combined volume of outstanding asset-backed securities, mortgage bonds and CLOs offered for sale over the first three days of this week totaled $4.3 billion.

Non-agency RMBS trading has been upbeat over the past week, with trading volumes standing at just over $1.4bn, according to TRACE data gathered by Empirasign, putting it just behind CMBS and ABS with respect to BWIC volume.

According to Empirasign, $1 billion of CLO paper was put up for sale last week. About $280 million failed to trade.

Investor demand for AAAs is still evident in the secondary. One May 2015 vintage AAA tranche covered at 143 bps on Friday after previously covering at 159 bps in late May, according to data from Empirasign Strategies.

The sale is the biggest auction of non-agency mortgage bonds since October 2014, when banks sold a US$5bn list, according to trade data provider Empirasign Strategies.

According to data from Empirasign, which tracks secondary ABS data, the bond covered at a premium of 101.702, and all other bonds covered at a premium of 100.070-103.156.

The trading started with a flurry on July 7 that included a $78.6 million offering. July 8 and 11 saw bidders pick up some paper out of dealer inventories, with bid lists circulating on the heels of those sales. They included a $130.1 million portfolio on July 13 and a $144.6 million book on July 14, according to Empirasign.

One buyer picked up a US$2.7m sliver of a senior Ally Financial auto bond from 2012 after it fetched a cover bid of 60bp, or 10bp more than a dealer was offering two days prior, according to trade data provider Empirasign.

New York-based bond data provider Empirasign Strategies hired two new staffers this week to support its technology and business development functions.

Empirasign Strategies, a New York-based provider of dealer bond offerings and trade color, has added evaluated prices from Interactive Data and Thomson Reuters to its platform, to provide a "second opinion" for traders looking for more context around dealer prices.

Prosper loans that were packaged into bonds by Citigroup Inc. and sold to investors fell by 4 cents on the dollar to 93 cents over the last week, according to bond data firm Empirasign Strategies.

Amid light trading this week, spreads widened marginally, but most issues were still trading near par. For example, a $5 million batch of bonds from a deal Citigroup issued in October changed hands at 99.5 cents on the dollar, according to Empirasign. A week earlier, the same paper was trading at par, one trader said. The 2.2-year bonds, with a "Baa3" rating from Moody's, are backed by consumer loans originated by Lending Club rival Prosper Marketplace.

On Thursday, a slice of the B/BB rated class from Citibank's last securitization of Prosper Marketplace loans in March saw a cover bid in the 950bp area but didn't trade, according to data provider Empirasign. Three dealers were talking the bond at more optimistic levels in the mid-high 700s range before the auction.

According to data from Empirasign, which tracks ABS secondary market trading volume, around $144.3m of agency adjustable rate mortgage bonds traded on March 21, while non-agency trading saw volumes of $142.8m on March 22 and $419.5m on March 23.