Main Street Capital Corporation
  Computation of Ratio of Earnings to Fixed Charges
  (numbers in thousands)    
    
|  | Three Months Ended March 31, 2013 | Year Ended December 31, 2012 | Year Ended December 31, 2011 | Year Ended December 31, 2010 | Year Ended December 31, 2009 | Year Ended December 31, 2008 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Earnings: | |||||||||||||||||||
| Net increase in net assets resulting from operations | $ | 23,629 | $ | 104,444 | $ | 64,106 | $ | 39,970 | $ | 11,956 | $ | 10,934 | |||||||
| Income tax expense (benefit) and excise taxes | 2,051 | 10,820 | 6,288 | 941 | (2,290 | ) | (3,182 | ) | |||||||||||
| Total earnings before taxes | $ | 25,680 | $ | 115,264 | $ | 70,394 | $ | 40,911 | $ | 9,666 | $ | 7,752 | |||||||
| Fixed Charges: | |||||||||||||||||||
| Interest expense | $ | 3,882 | $ | 15,631 | $ | 13,518 | $ | 9,058 | $ | 3,791 | $ | 3,778 | |||||||
| Total fixed charges | $ | 3,882 | $ | 15,631 | $ | 13,518 | $ | 9,058 | $ | 3,791 | $ | 3,778 | |||||||
| Earnings available to cover fixed charges | $ | 29,562 | $ | 130,895 | $ | 83,912 | $ | 49,969 | $ | 13,457 | $ | 11,529 | |||||||
| Ratio of earnings to fixed charges | 7.62 | 8.37 | 6.21 | 5.52 | 3.55 | 3.05 | |||||||||||||