Certification Pursuant to Rule 30a-2(b) under the 1940 Act and Section 906 of the Sarbanes-Oxley Act
I, James D. Dondero, Chief Executive Officer of Prospect Street® High Income Portfolio Inc. (the “Registrant”), certify that:
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| 1. | The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and |
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| 2. | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. |
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Date: | December 27, 2007 | | /s/ James D. Dondero |
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| | | James D. Dondero, Chief Executive Officer |
| | | (principal executive officer) |
I, M. Jason Blackburn, Chief Financial Officer of Prospect Street® High Income Portfolio Inc. (the “Registrant”), certify that:
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| 1. | The Form N-CSR of the Registrant (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and |
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| 2. | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. |
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Date: | December 27, 2007 | | /s/ M. Jason Blackburn |
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| | | M. Jason Blackburn, Chief Financial Officer |
| | | (principal financial officer) |
