While general market operations went smoothly after a two-day shutdown, Knight Capital saw its stock plunge as much as 8% before recovering toward the close.

FORBES: Sandy Hits Electronic Markets: Power Outages Force Knight Capital To Shut Down Equity Trading Operations

"At the end of the day, I keep telling myself that we're really a victim of capital market conditions that were beyond our control, " says Joseph Cece , chief executive officer of Digital Access (nasdaq: CACS - news - people ), a Bala Cynwyd, Pa.

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Separately, Capital One (COF) announced it would release second-quarter earnings a day early after the market closed.

FORBES: What's In Your Wallet? If It's a Capital One Card, You May Be Due a Refund