Citi bought ATD for $680 million in 2007. I live in Mt. Pleasant where ATD is located. Look for AUTO on Level II --- that's ATD. They were doing about 6% of avg. daily volume on NYSE and NASDAQ when acquired.
So they are in the market making business? That was not obvious from looking on their website, unless I am crazy. So I guess they are as solid as Citi, LOL.
Absolutely impressive facility. I grew up and lived a few blocks away from their offices, and took a few tours. Looked to me like they have great management and came out big after selling out to Citi. At one point in time I considered applying for an IT position out of undergrad but moved on for more schooling.