The data geeks are taking over Wall Street

There have historically been two dominant tribes on Wall Street.
There's the sell side, the investment banks, which, as their name suggests, mostly sell stuff. There's also the buy side, the fund managers, which mostly buy stuff.
A third group — including stock exchanges, trading platforms, clearinghouses, and data providers — helps facilitate transactions between the two dominant groups.
Those institutions are sometimes called the "pipes and plumbing of global finance." If you neede