Blackrock Senior Floating Rate Fund DEFA14A Additional proxy soliciting materials

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant x Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨	Preliminary Proxy Statement

¨	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨	Definitive Proxy Statement

x	Definitive Additional Materials

¨	Soliciting Material Pursuant to §240.14a-12

BlackRock Senior Floating Rate Fund, Inc.

BlackRock Senior Floating Rate Fund II, Inc.

(Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

x	No fee required.

¨	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 transaction 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:

¨	Fee paid previously with preliminary materials.

¨	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify 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:

LOGO

BLACKROCK SENIOR FLOATING RATE FUND, INC.

BLACKROCK SENIOR FLOATING RATE FUND II, INC.

IMPORTANT NOTICE:

SHAREHOLDER MEETING ADJOURNED TO MARCH 11, 2011

Dear Shareholder:

We recently mailed you proxy materials relating to proposals to be voted on at a Joint Special Shareholder Meeting of BlackRock Senior Floating Rate Fund, Inc. and BlackRock Senior Floating Rate Fund II, Inc., held on Monday, February 14, 2011 at 10 am ET. This letter was sent because you held shares in one or both of the funds on the record date andwe have not received your vote. The meeting has been adjourned to March 11, 2011 at 10 am ET to allow shareholders more time to submit their voting instructions.

YOUR VOTE IS VERY IMPORTANT

VOTING NOW HELPS AVOID UNNECESSARY COMMUNICATIONS WITH

SHAREHOLDERS AND ELIMINATES PHONE CALLS

For the reasons set forth in the proxy materials previously mailed to you,the Board of Directors of each fund unanimously recommends that you vote for the approval of the proposals.

Please vote using one of the following options:

CALL TOLL-FREE 1-866-963-6126

Call toll free1-866-963-6126 to speak with a live proxy services representative. Please call Monday through Friday 9:00 AM to 11:00 PM (ET), and Saturday from 12:00 Noon to 6:00 PM (ET).The estimated call duration is less than 2 minutes.

VOTE ONLINE

Log on to the website listed on your proxy card. Please have your proxy card in hand to access your control number (located in the box) and follow the on screen instructions.

VOTE BY TOUCH-TONE TELEPHONE

Call the toll free number listed on your proxy card. Please have your proxy card in hand to access your control number (located in the box) and follow the recorded instructions.

VOTE BY MAIL

Complete, sign and date the enclosed proxy card(s), then return them in the enclosed postage paid envelope.

If you have any questions about the proposals, you may call Computershare Fund Services, the Fund’s proxy solicitor, toll free at 1-866-963-6126.Thank you for voting.

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