Company types: 

• Hedge Funds
• Prop Trading
• Asset Managers
• Pension/Mutual Funds
• Investment Banks
• Commercial Banks
• Brokerages
• Insurance Companies
• Trading Technology Software Vendors
• Financial Consultants

Job titles/functions:

• High Frequency Traders
• Statistical Arbitrage Traders
• Algorithmic Traders
• Heads of Execution or Alternative Execution
• Financial Analysts/Engineers
• Quantitative Developers
• Traders
• Heads of Risk Management
• Heads/Directors of Quantitative Trading
• Heads of Fixed Income
• Heads of Equity Derivatives
• Heads of Credit Derivatives
• Heads of Hybrids/Commodity Derivatives/FX Derivatives
• Heads of Portfolio Management
• Heads of Quantitative Investment Strategies