Wall Street's self-regulator invited representatives from big banks, money managers and trading venues to its offices Thursday to discuss snags in the corporate bond market and whether steps could be taken to help withstand future shocks, a spokesman said.

The Financial Industry Regulatory Authority hosted a closed-door meeting at its offices in lower Manhattan to discuss growing issues with secondary trading in the $7.8 trillion U.S. market for corporate debt, he said.

Among the topics under discussion: how well the corporate debt market is currently serving the needs of its participants, and how well the market could respond to a credit or liquidity event, he said.

Liquidity is a term traders use to describe how easily they can transact at reasonable prices in large sizes.

While the cost of trading isn't elevated, some traders have complained it is becoming more difficult to buy and sell big blocks of bonds than it used to be. Many of them are blaming new rules that targeted banks, which long acted as middlemen on bond trades.

"Finra believes it is critical to bring together regulators and market participants to candidly discuss current and emerging issues in the corporate bond market," the Finra spokesman said in a statement Thursday.

He said the regulator would host another meeting early in July to explore the existing corporate bond market structure, and how it may evolve to meet the new trading challenges.

One of the ideas the industry has proposed is delaying reporting of large trade sizes by one day. Currently, all trades must be reported within 15 minutes, under Finra rules. News of the industry proposal was reported earlier by the Financial Times.

In corporate debt, trade sizes have been shrinking, lower trading activity has had a greater tendency to move prices, and fewer bonds are changing hands as a percentage of the market's overall size, traders said.

Trading has also concentrated around the newest debt, leaving older bonds to grow stale and less popular.

When Peter Tchir was a bond trader for UBS AG on its giant trading floor in Stamford, Conn., in 2007, calls came in nonstop from clients seeking bonds from home builders like Toll Brothers and D.R. Horton. Junk bonds flew, often in chunks of $10 million to $20 million, with salespeople yelling across the floor to get trades done in minutes, Mr. Tchir said.

Today, larger orders are rarely completed in a single day and finding a motivated buyer or seller can take a week or more, said Sean Burton, another former UBS bond trader who now heads client relations for technology provider Algomi.

While new issuance of corporate debt is robust, only 66% of outstanding U.S. corporate bonds rated investment grade changed hands last year, the lowest rate since 2005, according to Barclays PLC.

About 81% of investor respondents to a recent poll by researcher Greenwich Associates said that their ability to trade over $15 million of corporate bonds had become "difficult" or "extremely difficult."

Bond-pricing agent Interactive Data Corp. is launching a new "liquidity indicator" gauge next month, after more than 50 investment firms contacted it to discuss trading challenges and to estimate how many days it would take to liquidate their holdings under various market stresses.

In preparation for choppy trading conditions when the Federal Reserve moves to raise rates, bond funds have been loading up on cash. In November, The Wall Street Journal reported that large bond funds were holding the most cash since the financial crisis.

The Securities and Exchange Commission has also been making inquiries about mutual fund managers' readiness for more turbulence in bond prices and a drop in liquidity, said a person familiar with the matter.

The asset-management arm of the Securities Industry and Financial Markets Association said in a May letter to the SEC it had formed a liquidity "working group" and suggested the agency form its own committee on liquidity, in part to help understand the problem.

A spokeswoman for the SEC declined to comment.

"Everyone's talking about this problem because they're trying to figure out what happens when rates rise and if we have outflows," said Michael Nappi, a senior fixed-income trader at Eaton Vance Management.

Write to Katy Burne at katy.burne@wsj.com

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