How to calculate shares after a split:
If you have 100 shares, after a a) 3 for 2 split, you have ((100x3)/2) = 150 shares b) 4 for 3 split, you have ((100x4)/3) = 133 1/3 shares
Please note that Citigroup's Stock Split History reflects the stock splits of Citigroup and its predecessor companies only, and not the splits of companies either acquired by or merged into Citigroup.