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Units Outstanding
6 Months Ended
Jun. 30, 2013
Units Outstanding [Abstract]  
Units Outstanding
6.
Units Outstanding

Changes in Holding Units outstanding during the six-month period ended June 30, 2013 were as follows:

Outstanding as of December 31, 2012
  
105,173,342
 
Options exercised
  
778,739
 
Units issued
  
 
Units forfeited
  
 
Outstanding as of June 30, 2013
  
105,952,081
 
 
As we discussed in Note 3, on July 1, 2013, management of AllianceBernstein and Holding retired all unallocated Holding Units in AllianceBernstein's consolidated rabbi trust, which decreased each of their respective outstanding units by approximately 13.1 million units as of July 1, 2013.