Social Networking, Nasdaq | featured news

UBS decried a proposal from Nasdaq to make up losses for firms damaged in the Facebook stock-market debut, joining a growing chorus of Wall Street players that are calling on regulators to reject the exchange operator's plan.

Executives at the Internet company are pinning much of the blame on Nasdaq, according to several people close to the company and its underwriters, who spoke on the condition of anonymity because of continuing shareholder lawsuits. Tensions remain so high that Facebook is still considering switching exchanges and is weighing the costs of such a move, these people said.

UBS is sitting on losses that could be as high as $350 million stemming from its investment in the Facebook initial public offering, and is preparing legal action against Nasdaq as a result, people familiar with the matter told CNBC.

Nasdaq OMX Group Inc said it will offer cash and rebates totaling $40 million to compensate clients affected by the problems with Facebook Inc's initial public offering.

Two top U.S. financial regulators said on Tuesday the issues around the initial public offering of Facebook should be reviewed, putting fresh pressure on the company, its lead underwriter, Morgan Stanley, and the Nasdaq stock exchange.

Facebook will list its shares with Nasdaq, according to media reports. That would be a big win for the Nasdaq, which competes fiercely with NYSE Euronext Inc., especially for an initial public offering as large as Facebook's, pegged at $5 billion. The New York Times and CNBC cited anonymous sources on the potential listing.