CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT is required to file a 13D/G report to the SEC when the ownership of a company's total stock issue exceeds 5%.
| Filed | Shares | Percentage | |
|---|---|---|---|
| RIO VISTA ENERGY PARTNERS LP | October 12, 2006 | 296,817 | 15.5% |
| PENN OCTANE CORP | February 14, 2006 | 871,200 | 5.6% |
| GENESIS ENERGY LP | June 07, 2005 | 637,500 | 6.9% |