Prospect Street Income Shares Inc - Additional Proxy Soliciting Materials (definitive) (DEFA14A)

Vote by Touch-tone Phone. You may cast your vote by telephone by calling the toll-free number found on the enclosed proxy ballot(s).

Vote Through the Internet. You may cast your vote using the Internet by logging into the Internet address located on the enclosed proxy ballot(s) and following the instructions on the website.

Vote by Mail. You may cast your vote by signing, dating and mailing the enclosed proxy ballot(s) in the postage-prepaid return envelope provided. If convenient for you, please utilize one of the first two options above to ensure that your response is received in time for the Joint Annual Meeting on June 6, 2008.

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant þ
Filed by a Party other than the Registrant o

Check the appropriate box:

o		Preliminary Proxy Statement
o		Confidential, for Use of the Commission Only (as permitted by Rule 14a- 6(e)(2) )
o		Definitive Proxy Statement
þ		Definitive Additional Materials
o		Soliciting Material Pursuant to Sec. 240.14a-12

Prospect Street ^® High Income Portfolio Inc.

(Name of Registrant as Specified In Its Charter)

Prospect Street ^® Income Shares Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than Registrant)

Payment of Filing Fee (Check the appropriate box):

þ		No fee required.
o		Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

	1)		Title of each class of securities to which transactions applies:


	2)		Aggregate number of securities to which transaction applies:

	3)		Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

	4)		Proposed maximum aggregate value of transaction:

	5)		Total fee paid:

o		Fee paid previously with preliminary materials.

o		Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identity the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	1)		Amount Previously Paid:

	2)		Form, Schedule or Registration Statement No.:

	3)		Filing Party:

	4)		Date Filed:

Prospect Street High Income Portfolio Inc.
Prospect Street Income Shares Inc.

Two Galleria Tower
13455 Noel Road, Suite 800
Dallas, TX 75240

May 20, 2008

RE: Upcoming Joint Annual Meeting of Stockholders

Dear Stockholder:

We need your help. The Joint Annual Meeting of Stockholders of the Prospect Street High Income Portfolio Inc. and the Prospect Street Income Shares Inc. is approaching and we still have not received your important vote. Your vote is extremely important, regardless of the number of shares that you own. Please take a moment now to cast your vote so that your shares may be represented in time for the Meeting on June 6, 2008 at 8:00 a.m. Central Time.

The Board of Directors of your fund recommends a vote in IN FAVOR of the proposals detailed in the prospectus/proxy statement.

PLEASE VOTE TODAY so that your shares may be represented in time for the upcoming Annual Meeting. Another copy of your ballot(s) has been enclosed with this letter for your convenience. Should you have any questions regarding the proposal, please call this toll-free number 1-800-283-8518. The following voting options have been set up for your convenience.

Again, please do not hesitate to call toll-free 1-800-283-8518 if you have any questions regarding this matter. If you have voted since the mailing of this letter, we apologize for the follow up mailing and thank you for your participation. Thank you for your assistance with this important matter.

Sincerely,

James D. Dondero
President

OBO

Prospect Street High Income Portfolio Inc.
Prospect Street Income Shares Inc.

Two Galleria Tower
13455 Noel Road, Suite 800
Dallas, TX 75240

May 20, 2008

RE: Upcoming Joint Annual Meeting of Stockholders

Dear Stockholder:

The Board of Directors of your fund recommends a vote in IN FAVOR of the proposals detailed in the prospectus/proxy statement.

PLEASE VOTE TODAY so that your shares may be represented in time for the upcoming Annual Meeting. Another copy of your ballot(s) has been enclosed with this letter for your convenience. Should you have any questions regarding the proposal or to cast your vote by phone, please call this toll-free number 1-800-283-8518. The following voting options have been set up for your convenience.


			1.			Vote by Telephone. You may cast your vote by calling our toll-free proxy hotline at 1-800-283-8518. Representatives are available to record your vote Monday through Friday 9:00 a.m. to 10:00 p.m. Eastern Time.

			2.			Vote by Touch-tone Phone. You may cast your vote by telephone by calling the toll-free number found on the enclosed proxy ballot(s).

			3.			Vote Through the Internet. You may cast your vote using the Internet by logging into the Internet address located on the enclosed proxy ballot(s) and following the instructions on the website.

			4.			Vote by Mail. You may cast your vote by signing, dating and mailing the enclosed proxy ballot(s) in the postage-prepaid return envelope provided. If convenient for you, please utilize one of the first three options above to ensure that your response is received in time for the Joint Annual Meeting on June 6, 2008.

Sincerely,

James D. Dondero
President

NOBO

Prospect Street High Income Portfolio Inc.
Prospect Street Income Shares Inc.

Two Galleria Tower
13455 Noel Road, Suite 800
Dallas, TX 75240

May 29, 2008

RE: URGENT NOTICE

Dear Stockholder:

You are one of the largest stockholders who has not yet voted your proxy for the upcoming Joint Annual Meeting of Stockholders of the Prospect Street High Income Portfolio Inc. and the Prospect Street Income Shares Inc. We need your vote before June 6 ^th to avoid a costly meeting adjournment. Your vote is extremely important particularly because of the large position your hold. Please take a moment now to cast your vote so that your shares may be represented in time for the Meeting on June 6, 2008 at 8:00 a.m. Central Time.

The Board of Directors of your fund recommends a vote in IN FAVOR of the proposals detailed in the prospectus/proxy statement.

Another copy of your ballot(s) has been enclosed with this letter for your convenience. Should you have any questions regarding the proposal, please call this toll-free number 1-800-283-8518. The following voting options have been set up for your convenience.

Sincerely,

James D. Dondero
President

OBO

Prospect Street High Income Portfolio Inc.
Prospect Street Income Shares Inc.

Two Galleria Tower
13455 Noel Road, Suite 800
Dallas, TX 75240

May 29, 2008

RE: URGENT NOTICE

Dear Stockholder:

The Board of Directors of your fund recommends a vote in IN FAVOR of the proposals detailed in the prospectus/proxy statement.

Another copy of your ballot(s) has been enclosed with this letter for your convenience. Should you have any questions regarding the proposal or to cast your vote by phone, please call this toll-free number 1-800-283-8518. The following voting options have been set up for your convenience.


			1.			Vote by Telephone. You may cast your vote by calling our toll-free proxy hotline at 1-800-283-8518. Representatives are available to record your vote Monday through Friday 9:00 a.m. to 10:00 p.m. Eastern Time.

			2.			Vote by Touch-tone Phone. You may cast your vote by telephone by calling the toll-free number found on the enclosed proxy ballot(s).

			3.			Vote Through the Internet. You may cast your vote using the Internet by logging into the Internet address located on the enclosed proxy ballot(s) and following the instructions on the website.

			4.			Vote by Mail. You may cast your vote by signing, dating and mailing the enclosed proxy ballot(s) in the postage-prepaid return envelope provided. If convenient for you, please utilize one of the first three options above to ensure that your response is received in time for the Joint Annual Meeting on June 6, 2008.