Fidelity Investments

• Friendly co-workers
• Good work-life balance
• Good benefits
• The heads of the company can be pretty generous when the company is doing well
• Free training
• Free milk and biscuits in the tea areas.
• They encourage you to think about your career and move about within the company
• Lots of chances to meet people high in the company. This is a good opportunity you aren't as likely to get at the bigger offices.

Because there are a lot of security precautions which make some jobs which should be simple very convoluted. The precautions are all very understandable, but they do get annoying when you work with them.

I can't think of anything major.