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:
| | 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: June 26, 2008 | /s/ James D. Dondero | |
| | James D. Dondero, | |
| | Chief Executive Officer and President
(principal executive officer) | |
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I, M. Jason Blackburn, Chief Financial Officer of Prospect Street® High Income Portfolio Inc. (the “Registrant”), certify that:
| | 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: June 26, 2008 | /s/ M. Jason Blackburn | |
| | M. Jason Blackburn, Chief Financial Officer, | |
| | Treasurer and Secretary
(principal financial officer) | |
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