Citigroup Inc. (C) plans to file a claim seeking compensation from Nasdaq OMX Group Inc. (NDAQ) for losses the bank suffered trading in last May's market debut of Facebook Inc. (FB), according to people close to the discussions.

Citigroup is exploring its potential recovery of losses under a controversial Nasdaq compensation plan approved by regulators last month that allotted a total of $62 million for all claims in the botched Facebook debut. Any payout to Citigroup would likely cover only a portion of the roughly $20 million it lost in the episode, and Citigroup has yet to rule out pursuing legal action against Nasdaq to recoup the full scope of its losses, one of the people close to the discussions said.

Monday is the deadline for claims and supporting documents to be filed to the Financial Industry Regulatory Authority, which is overseeing Nasdaq's compensation plan. The Securities and Exchange Commission approved the plan on March 25.

The Nasdaq plan that has split Wall Street's biggest securities firms, which collectively lost around $500 million trading in newly minted Facebook stock due to problems with Nasdaq's exchange systems.

Major handlers of trading for online brokerages took the brunt of losses in the episode, and some, including Knight Capital Group Inc. (KCG) and Citadel LLC, have chosen to file claims under Nasdaq's plan, according to brokerage officials. Both firms lost about $35 million each in the Facebook trading.

UBS AG (UBS), the firm seen suffering the heaviest blow with losses of $356 million, last month said it would seek full coverage of the loss through arbitration.

While Citigroup's Facebook trading loss was relatively small for a bank of its size, the hit to its market-making unit arrived at a time when brokerages' profits generally were under pressure due to a prolonged slide in stock-trading activity and the kind of market volatility that helps traders make profits. Nasdaq's mismanagement of the Facebook stock-market debut--one of the biggest initial public offerings in history--added to "a level of mistrust that continues to plague the market," Citigroup officials wrote in a letter to the SEC last summer.

Citigroup and other companies that file claims don't immediately give up their right to pursue arbitration or other legal avenues against Nasdaq in the Facebook matter. Citigroup is expected to decide on whether to accept payment for a portion of its losses once all claims are tabulated and Nasdaq outlines how much each firm is due. If firms accept payment, they must then waive the right to pursue legal action against the exchange.

A Nasdaq spokesman declined to comment on Citigroup's claim or on how long it may take to evaluate claims.

Nasdaq originally proposed a $40 million compensation package that included $27 million in discounted trading fees, but that drew rebukes from both traders and rival exchanges. Nasdaq increased the compensation plan to its current size last summer, but both Citigroup and UBS in August sharply criticized the new plan as too small and ill-conceived.

In submitting claims on the package, firms must outline how much they believed they lost due to Nasdaq's troubles bringing Facebook shares to market on May 18. That morning Nasdaq delayed several times the opening trade in Facebook's stock as exchange officials struggled to manage a flood of orders submitted to buy and sell the social network's shares.

When the stock began trading, some traders bought and sold shares for hours on behalf of customers without receiving confirmation of trades from Nasdaq, forcing brokerages to guess at their positions. Part of firms' submissions to Finra includes data on trades placed during that period, according to Nasdaq's outline of the process.

Write to Jacob Bunge at jacob.bunge@dowjones.com

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