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Units Outstanding
9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Units Outstanding
Units Outstanding

Changes in AB Units outstanding during the nine-month period ended September 30, 2019 were as follows:
 
 
 
Outstanding as of December 31, 2018
268,850,276

Options exercised
443,800

Units issued
2,073,854

Units retired (1)
(3,184,973
)
Balance as of September 30, 2019
268,182,957



(1) Includes 982 AB Units purchased in private transactions and retired during the first nine months of 2019.