In many ways, Paycom Software (NYSE: PAYC) has been a perfect stock for investors -- putting up impressive top-line growth numbers while increasing margins and free cash flow over the last several years. With its all-in-one cloud-based solution that combines payroll along with multiple HR tasks, Paycom continues to make significant inroads with companies in its 50-to-2,000-employee target, primarily by stealing market share from ADP (NASDAQ: ADP).During multiple conference appearances in November and December, Paycom CEO Chad Richison and CFO Craig Bolte provided new insights on the company's total addressable market and margin trends, its sales force, and why Paycom is staying laser-focused on its mid-market niche.Image source: Paycom Software.