What Do Berkshire, Twitter and Alibaba Have in Common?

Global Trading Systems, one of four high-frequency-trading firms managing just about all the trading on the NYSE floor, is making a play for corporate clients. 

It’s the end of another day on the New York Stock Exchange in Lower Manhattan, and that means it’s Global Trading Systems vs. the world.

Brokers in blue jackets are crowding around the GTS trading post, looking to sell shares of Alibaba. They’re calling out figures above $98 a share, where they expect the Chinese retailer’s price to close. GTS is pushing back: They’ve got it wrong.

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