June 26 is renowned as one of the busiest trading days of the year, and Reuters believes as much as $40 billion in transactions will occur in its final trading hours.

The culprit is the Russell Stock Index, an operator whom adjusts its indices just once a year. The process is a transparent, straightforward formula based on market capitalization, liquidity and float. A total of 3,000 of the largest publicly traded companies in the world make the list. The top performers are slotted into the Russell 1000, but arguably the most popular is the R...


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