The Gross Margin of Hydrogen Engine Center Inc (HYEG) is -13.61%.
Gross Margin represents the percentage of revenue that exceeds the cost of goods sold. It reflects a company's efficiency in producing and selling its products.
| Date | Value |
|---|---|
| 2008-12-31 | -13.61% |
| 2007-12-31 | -59.11% |
| 2006-12-31 | -145.32% |