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Unsurprisingly, billionaire investor Bill Ackman added to his position in footwear giant Nike (NYSE:NKE) during the last quarter. As to whether Ackman is finished building his position remains the multi-billion-dollar question.

Ackman noted in the company's June 30 interim report that markets have been exhibiting "an enormous amount of volatility when ma

Over the last two quarters, Ackman has built two new significant positions for Pershing Square -- Nike ( NKE 3.06%) and Brookfield ( BN 1.29%) -- piling an estimated $2.2 billion into those stocks during the third quarter alone. Here's why.