As Institutional Investor points out, "forget the Dow 30 - the 25 companies listed here are the favorites of high frequency traders in the US." In other words, here is where you get the best beta bang for your buck (what is this eahlfa?) as computer tries to outsmart computer in just these 25 shares, where the bulk of the market volume is focused. Can you spell churn? And, not surprisingly, this is where the bulk of the liquidity rebates provided by the exchanges if focused. Soon this list will be 5, and soon thereafter: SKN (DarkPool: SKYNET, share price: infinity).
Source: Institutional Investor