In February, defense contractor Blackwater Worldwide changed its name to the neutral-sounding Xe (pronounced "Zee").

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In 2009 Blackwater announced that it was changing its name to Xe Holdings, LLC.

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Losing the contract will be a huge blow to Blackwater, which was renamed Xe last month.

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He discusses the best tools for parallel processing like Intel Parallel Studio XE and Intel Parallel Building Blocks.

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The companies began collaborating at the beginning of 2011, announced their partnership in August and debuted the first Beats Audio-integrated phone, the HTC Sensation XE, in September.

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"I urge you not to enter into further contracts with Xe and to immediately review any existing contracts, " the letter said, according to a copy provided to CNN.

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Blackwater Worldwide announced it will now be called XE.

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Blackwater, recently renamed Xe, issued a statement Tuesday, saying it would respond "to the anonymous unsubstantiated and offensive assertions put forward by the plaintiffs, " in a brief to be filed August 17.

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According to Divya Sharma at XE, the option for high-growth Chinese companies listed in the U.S. to go private and relist in Asia may be attractive given the likelihood of better valuations for these companies back home.

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