Nasdaq hack

The National Security Agency, a US electronic intelligence service, has been involved in the in vestigation into last year’s hacker attack on Nasdaq OMX Group, a US enforcement official said yesterday.

Griffin gap

Citadel, the $11 billion hedge fund run by Ken Griffin, is shutting one of its residential mortgage funds after Bill King, the portfolio manager, left the Chicago-based firm, according to sources.

Icahn rebuff

Billionaire Carl Icahn’s New York lawsuit alleg ing that Lionsgate Enter tainment’s management conspired with large shareholders to thwart his hostile bid for the film studio was dis missed.

Penney pay

JC Penney CEO Myron E. Ullman III received compensation worth $12.3 million in 2010, a 48 percent increase from 2009, according to an analysis by The Associ ated Press.

Microsoft exit

In the latest high-level departure at Microsoft, Mich Mathews, head of marketing, will retire at the end of the summer after 22 years with the company.