Calls for Reg NMS revamp ring at House hearing.

More analysis needed, said Giancarlo during his nomination hearing.

Can regulators fix the bond-liquidity mess they helped create?

Liquidity is deepening, but challenges remain.

Changing the OPR could lead to 'enhanced' regulatory mandates.

Equity market structure item is down to philosophical arguments.

Amex and Arca won't cut prices to gain market share, CEO says.

Don't expect the roll-outs to have a big impact on market share, one industry analyst says.

Less can be more when it comes to trading venues.

Small-cap liquidity has improved slightly, but more work is needed.