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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-06502

Name of Fund: BlackRock MuniYield Investment Fund (MYF)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock
MuniYield Investment Fund, 55 East 52nd Street, New York, NY 10055

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 07/31/2011

Date of reporting period: 04/30/2011

Item 1 – Schedule of Investments



BlackRock MuniYield Investment Fund (MYF)
Schedule of Investments April 30, 2011 (Unaudited)
(Percentages shown are based on Net Assets)

    Par   
Municipal Bonds    (000)  Value 
Alaska — 0.6%       
Alaska Municipal Bond Bank Authority,     
RB, Series 1, 5.38%, 9/01/33  $ 1,000  $ 1,033,740 
Arizona — 0.7%       
Pima County IDA, Refunding IDRB,       
Tucson Electric Power, 5.75%,       
9/01/29    1,230  1,226,298 
California — 19.9%       
California Educational Facilities       
Authority, RB, University of Southern     
California, Series A, 5.25%, 10/01/38  2,740  2,812,665 
California Health Facilities Financing       
Authority, Refunding RB:       
Catholic Healthcare West, Series A,     
6.00%, 7/01/39    710  714,025 
St. Joseph Health System, Series A,     
5.75%, 7/01/39    2,600  2,431,728 
Sutter Health, Series B, 6.00%,       
8/15/42    1,645  1,668,211 
California State Public Works Board, RB:     
Department of General Services,     
Buildings 8 & 9, Series A, 6.25%,     
4/01/34    4,525  4,623,826 
Various Capital Projects,       
Sub-Series I-1, 6.38%, 11/01/34  1,265  1,306,859 
Grossmont Union High School District,     
GO, Election of 2008, Series B,       
4.75%, 8/01/45    4,925  4,223,483 
Los Angeles Department of Airports,       
Refunding RB, Senior, Los Angeles     
International Airport, Series A, 5.00%,     
5/15/35    5,420  5,279,297 
Los Angeles Department of Water &       
Power, RB, Power System,       
Sub-Series A-1, 5.25%, 7/01/38    3,600  3,653,424 
San Diego Regional Building Authority     
California, RB, County Operations       
Center & Annex, Series A, 5.38%,       
2/01/36    3,310  3,319,069 
San Francisco City & County Airports       
Commission, Refunding RB, Second     
Series A-3, Mandatory Put Bonds,       
AMT, 6.75%, 5/01/19 (a)    2,500  2,500,775 
State of California, GO, Various Purpose,     
6.00%, 3/01/33    2,535  2,708,521 
      35,241,883 

 

    Par   
Municipal Bonds    (000)  Value 
Colorado — 2.3%       
City & County of Denver Colorado,       
Refunding RB, Series A, 5.25%,       
11/15/36  $ 4,050  $ 4,032,949 
Delaware — 1.3%       
County of Sussex Delaware, RB, NRG     
Energy, Inc., Indian River Project,       
6.00%, 10/01/40    2,440  2,380,635 
District of Columbia — 1.2%       
District of Columbia Water & Sewer       
Authority, RB, Series A, 5.25%,       
10/01/29    2,000  2,114,360 
Florida — 9.7%       
City of Jacksonville Florida, RB, Series B     
(NPFGC), 5.13%, 10/01/32    1,500  1,474,095 
County of Miami-Dade Florida, RB,       
Miami International Airport, Series A,     
AMT (NPFGC), 6.00%, 10/01/29    3,275  3,309,584 
County of Osceola Florida, RB, Series A     
(NPFGC), 5.50%, 10/01/27    1,510  1,524,919 
Hillsborough County IDA, RB, AMT,       
National Gypsum Co.:       
Series A, 7.13%, 4/01/30    2,500  2,188,775 
Series B, 7.13%, 4/01/30    3,750  3,283,162 
Manatee County Housing Finance       
Authority, RB, Series A, AMT (Ginnie     
Mae), 5.90%, 9/01/40    775  822,903 
Santa Rosa County School Board, COP,     
Refunding, Series 2 (NPFGC), 5.25%,     
2/01/26    1,015  1,023,404 
South Lake County Hospital District, RB,     
South Lake Hospital Inc., 6.38%,       
10/01/34    1,150  1,132,750 
Village Center Community Development     
District, RB, Series A (NPFGC):       
5.38%, 11/01/34    1,995  1,643,581 
5.13%, 11/01/36    1,000  783,380 
      17,186,553 
Georgia — 4.1%       
County of Fulton Georgia, RB (NPFGC),     
5.25%, 1/01/35    1,000  1,006,690 

 

Portfolio Abbreviations     
To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated 
according to the following list:     
AGC  Assured Guaranty Corp.  HFA  Housing Finance Agency 
AGM  Assured Guaranty Municipal Corp.  HRB  Housing Revenue Bonds 
AMT  Alternative Minimum Tax (subject to)  IDA  Industrial Development Authority 
COP  Certificates of Participation  IDRB  Industrial Development Revenue Bonds 
EDA  Economic Development Authority  ISD  Independent School District 
ERB  Education Revenue Bonds  NPFGC  National Public Finance Guarantee Corp. 
GO  General Obligation Bonds  RB  Revenue Bonds 
    S/F  Single-Family 

 

BLACKROCK MUNIYIELD INVESTMENT FUND  APRIL 30, 2011  1 

 



BlackRock MuniYield Investment Fund (MYF)
Schedule of Investments (continued)
(Percentages shown are based on Net Assets)

    Par   
Municipal Bonds    (000)  Value 
Georgia (concluded)       
Municipal Electric Authority of Georgia,     
Refunding RB, Project One,       
Sub-Series D, 6.00%, 1/01/23  $ 5,600  $ 6,266,064 
      7,272,754 
Illinois — 10.2%       
Chicago Park District, GO, Harbor       
Facilities, Series C, 5.25%, 1/01/40  2,660  2,648,083 
City of Chicago Illinois, Refunding RB,     
General, Third Lien, Series C, 6.50%,     
1/01/41 (b)    1,275  1,358,691 
County of Cook Illinois, GO, Refunding,     
Series A, 5.25%, 11/15/33    3,345  3,347,408 
Illinois Finance Authority, Refunding RB:     
Central DuPage Health, Series B,     
5.38%, 11/01/39    1,200  1,119,816 
Northwestern Memorial Hospital,     
Series A, 6.00%, 8/15/39    4,160  4,305,059 
OSF Healthcare System, Series A,     
6.00%, 5/15/39    1,975  1,907,455 
Railsplitter Tobacco Settlement       
Authority, RB:       
5.50%, 6/01/23    1,370  1,321,886 
6.00%, 6/01/28    390  375,079 
State of Illinois, RB, Build Illinois,       
Series B, 5.25%, 6/15/34    1,700  1,644,648 
      18,028,125 
Indiana — 4.0%       
Indiana Finance Authority, Refunding     
RB, Trinity Health, Series B, 4.50%,     
12/01/37    3,000  2,422,560 
Indiana Municipal Power Agency, RB,     
Series B, 6.00%, 1/01/39    4,525  4,639,030 
      7,061,590 
Kansas — 1.9%       
Kansas Development Finance Authority,     
Refunding RB, Adventist Health,       
5.50%, 11/15/29    3,250  3,373,240 
Kentucky — 4.2%       
Kentucky Economic Development       
Finance Authority, Refunding RB,       
Owensboro Medical Health System,     
Series A, 6.38%, 6/01/40    1,300  1,233,414 
Louisville & Jefferson County       
Metropolitan Government Parking       
Authority, RB, Series A, 5.75%,       
12/01/34    3,200  3,374,912 
Louisville/Jefferson County Metropolitan     
Government, Refunding RB, Jewish     
Hospital & St. Mary's HealthCare,       
6.13%, 2/01/37    2,955  2,892,856 
      7,501,182 
Louisiana — 0.8%       
Louisiana Local Government       
Environmental Facilities & Community     
Development Authority, RB, Westlake     
Chemical Corp., Series A-1, 6.50%,     
11/01/35    1,420  1,425,481 

 

    Par   
Municipal Bonds    (000)  Value 
Massachusetts — 3.9%       
Massachusetts HFA, HRB, Series B,       
AMT, 5.50%, 6/01/41  $ 2,535  $ 2,359,274 
Massachusetts HFA, Refunding HRB,     
Series F, AMT, 5.70%, 6/01/40    2,090  2,018,020 
Massachusetts HFA, Refunding RB,       
Series C, AMT, 5.35%, 12/01/42    1,630  1,489,168 
Massachusetts State College Building     
Authority, RB, Series A, 5.50%,       
5/01/39    1,000  1,034,650 
      6,901,112 
Michigan — 4.1%       
Kalamazoo Hospital Finance Authority,     
Refunding RB, Bronson Methodist       
Hospital, 5.50%, 5/15/36    3,945  3,754,614 
Michigan State Building Authority,       
Refunding RB, Facilities Program,       
Series I, 6.00%, 10/15/38    1,250  1,300,188 
Royal Oak Hospital Finance Authority     
Michigan, Refunding RB, William       
Beaumont Hospital, 8.25%, 9/01/39  1,970  2,233,527 
      7,288,329 
Nebraska — 0.3%       
Lancaster County Hospital Authority No.     
1, RB, Immanuel Obligation Group,     
5.63%, 1/01/40    625  610,600 
Nevada — 8.0%       
City of Las Vegas Nevada, GO, Limited     
Tax, Performing Arts Center, 6.00%,     
4/01/34    2,850  3,026,757 
County of Clark Nevada, GO, Refunding,     
Transportation, Series A, 5.00%,       
12/01/29    3,600  3,667,788 
County of Clark Nevada, RB:       
Motor Vehicle Fuel Tax, 5.00%,       
7/01/28    1,300  1,317,316 
Series B, 5.75%, 7/01/42    6,055  6,107,921 
      14,119,782 
New Jersey — 2.8%       
New Jersey EDA, Refunding RB, New       
Jersey American Water Co., Inc.       
Project, Series A, AMT, 5.70%,       
10/01/39    2,250  2,224,913 
New Jersey Transportation Trust Fund     
Authority, RB, Transportation System,     
Series A, 5.88%, 12/15/38    2,670  2,783,822 
      5,008,735 
New York — 4.4%       
City of Troy New York, Refunding RB,       
Rensselaer Polytechnic, Series A,       
5.13%, 9/01/40    115  110,035 
New York City Municipal Water Finance     
Authority, RB, Second General       
Resolution, Series EE, 5.38%,       
6/15/43    760  783,864 
New York City Transitional Finance       
Authority, RB, Fiscal 2009, Series S-3,     
5.25%, 1/15/39    2,500  2,526,625 

 

2 BLACKROCK MUNIYIELD INVESTMENT FUND  APRIL 30, 2011 

 



BlackRock MuniYield Investment Fund (MYF)
Schedule of Investments (continued)
(Percentages shown are based on Net Assets)

    Par   
Municipal Bonds    (000)  Value 
New York (concluded)       
New York Liberty Development Corp.,     
Refunding RB, Second Priority, Bank     
of America Tower at One Bryant Park     
Project, 6.38%, 7/15/49  $ 1,200  $ 1,201,128 
Triborough Bridge & Tunnel Authority,     
RB, General, Series A-2, 5.38%,       
11/15/38    3,030  3,102,508 
      7,724,160 
North Carolina — 2.5%       
North Carolina Medical Care       
Commission, RB, Novant Health       
Obligation, Series A, 4.75%,       
11/01/43    5,420  4,384,130 
Pennsylvania — 3.4%       
Pennsylvania Economic Development     
Financing Authority, RB, American       
Water Co. Project, 6.20%, 4/01/39  1,075  1,122,042 
Pennsylvania Turnpike Commission, RB,     
Sub-Series B, 5.25%, 6/01/39    5,150  4,931,176 
      6,053,218 
Puerto Rico — 0.6%       
Puerto Rico Sales Tax Financing Corp.,     
RB, First Sub-Series A, 6.00%,       
8/01/42    1,000  998,490 
Texas — 7.4%       
Conroe ISD Texas, GO, School Building,     
Series A, 5.75%, 2/15/35    1,800  1,913,004 
Harris County Health Facilities       
Development Corp., Refunding RB,     
Memorial Hermann Healthcare       
System, Series B, 7.25%, 12/01/35  800  867,792 
Lower Colorado River Authority, RB,       
5.75%, 5/15/28    1,620  1,705,698 
North Texas Tollway Authority, RB,       
System, First Tier, Series K-1 (AGC),     
5.75%, 1/01/38    1,000  1,011,030 
Tarrant County Cultural Education       
Facilities Finance Corp., RB, Scott &     
White Healthcare, 6.00%, 8/15/45  3,795  3,864,904 
Texas Private Activity Bond Surface       
Transportation Corp., RB, Senior Lien,     
NTE Mobility Partners LLC, North       
Tarrant Express Managed Lanes       
Project, 6.88%, 12/31/39    3,600  3,693,240 
      13,055,668 
Utah — 1.2%       
City of Riverton Utah, RB, IHC Health       
Services Inc., 5.00%, 8/15/41    2,370  2,195,995 
Virginia — 1.1%       
Virginia Public School Authority, RB,       
School Financing, 6.50%, 12/01/35  1,700  1,875,100 
Total Municipal Bonds – 100.6%      178,094,109 

 

Municipal Bonds Transferred to Tender  Par   
Option Bond Trusts (c)    (000)  Value 
California — 22.0%       
Bay Area Toll Authority, Refunding RB,     
San Francisco Bay Area, Series F-1,     
5.63%, 4/01/44  $ 2,680  $ 2,767,577 
California Educational Facilities       
Authority, RB, University of Southern     
California, Series A, 5.25%, 10/01/39  4,200  4,308,780 
Grossmont Union High School District,     
GO, Election of 2008, Series B,       
5.00%, 8/01/40    6,000  5,590,260 
Los Angeles Community College District     
California, GO, Election of 2008:       
Series A, 6.00%, 8/01/33    7,697  8,308,389 
Series C, 5.25%, 8/01/39    5,250  5,303,235 
Los Angeles Unified School District       
California, GO, Series I, 5.00%,       
1/01/34    790  766,995 
San Diego Public Facilities Financing       
Authority, Refunding RB, Series B,       
5.50%, 8/01/39    8,412  8,630,315 
University of California, RB, Series O,       
5.75%, 5/15/34    3,000  3,192,390 
      38,867,941 
Colorado — 1.2%       
Colorado Health Facilities Authority,       
Refunding RB, Catholic Healthcare,     
Series A, 5.50%, 7/01/34    2,149  2,152,052 
District of Columbia — 3.8%       
District of Columbia, RB, Series A,       
5.50%, 12/01/30    2,805  3,050,774 
District of Columbia Water & Sewer       
Authority, RB, Series A, 5.50%,       
10/01/39    3,507  3,645,928 
      6,696,702 
Florida — 4.5%       
City of Jacksonville Florida, RB, Better     
Jacksonville (NPFGC), 5.00%,       
10/01/27    2,700  2,727,459 
Hillsborough County Aviation Authority,     
RB, Series A, AMT (AGC), 5.50%,       
10/01/38    3,869  3,659,553 
Lee County Housing Finance Authority,     
RB, Multi-County Program, Series A-2,     
AMT (Ginnie Mae), 6.00%, 9/01/40  1,425  1,514,832 
      7,901,844 
Illinois — 4.3%       
Illinois Finance Authority, RB, University     
of Chicago, Series B, 6.25%, 7/01/38  5,300  5,869,644 
Illinois State Toll Highway Authority, RB,     
Series B, 5.50%, 1/01/33    1,750  1,769,016 
      7,638,660 
Nevada — 6.4%       
Clark County Water Reclamation       
District, GO:       
Limited Tax, 6.00%, 7/01/38    5,000  5,404,150 
Series B, 5.50%, 7/01/29    5,668  6,012,152 
      11,416,302 

 

BLACKROCK MUNIYIELD INVESTMENT FUND  APRIL 30, 2011  3 

 



BlackRock MuniYield Investment Fund (MYF)
Schedule of Investments (continued)
(Percentages shown are based on Net Assets)

Municipal Bonds Transferred to Tender  Par   
Option Bond Trusts (c)  (000)  Value 
New Hampshire — 1.3%     
New Hampshire Health & Education     
Facilities Authority, Refunding RB,     
Dartmouth College, 5.25%, 6/01/39  $ 2,159  $ 2,236,529 
New Jersey — 3.6%     
New Jersey State Housing & Mortgage     
Finance Agency, RB, S/F Housing,     
Series CC, 5.25%, 10/01/29  2,291  2,306,765 
New Jersey Transportation Trust Fund     
Authority, RB, Transportation System,     
Series A (AGM), 5.00%, 12/15/32  4,000  3,994,520 
    6,301,285 
New York — 4.7%     
New York City Municipal Water Finance     
Authority, RB, Series FF-2, 5.50%,     
6/15/40  2,504  2,610,743 
New York State Dormitory Authority,     
ERB, Series B, 5.25%, 3/15/38  5,700  5,810,124 
    8,420,867 
Ohio — 1.6%     
County of Allen Ohio, Refunding RB,     
Catholic Healthcare, Series A, 5.25%,     
6/01/38  3,120  2,793,149 
South Carolina — 1.9%     
South Carolina State Public Service     
Authority, RB, Santee Cooper,     
Series A, 5.50%, 1/01/38  3,240  3,396,622 
Texas — 5.4%     
City of San Antonio Texas, Refunding     
RB, Series A, 5.25%, 2/01/31  3,989  4,206,947 
Harris County Cultural Education     
Facilities Finance Corp., RB, Hospital,     
Texas Children's Hospital Project,     
5.50%, 10/01/39  5,400  5,353,722 
    9,560,669 
Virginia — 1.0%     
Fairfax County IDA Virginia, Refunding     
RB, Health Care, Inova Health System,     
Series A, 5.50%, 5/15/35  1,749  1,755,479 
Wisconsin — 1.7%     
Wisconsin Health & Educational     
Facilities Authority, Refunding RB,     
Froedtert & Community Health Inc.,     
5.25%, 4/01/39  3,289  3,010,773 
Total Municipal Bonds Transferred to     
Tender Option Bond Trusts – 63.4%    112,148,874 
Total Long-Term Investments     
(Cost – $291,608,375) – 164.0%    290,242,983 
Short-Term Securities  Shares   
FFI Institutional Tax-Exempt Fund,     
0.23% (d)(e)  5,125,662  5,125,662 
Total Short-Term Securities     
(Cost – $5,125,662) – 2.9%    5,125,662 

 

  Value 
Total Investments   
(Cost – $296,734,037*) – 166.9%  $ 295,368,645 
Other Assets Less Liabilities – 1.5%  2,739,501 
Liability for Trust Certificates, Including Interest   
Expense and Fees Payable – (34.8)%  (61,675,333) 
Preferred Shares, at Redemption Value – (33.6)%  (59,479,633) 
Net Assets Applicable to Common Shares – 100.0%  $ 176,953,180 
* The cost and unrealized appreciation (depreciation) of investments as of 
April 30, 2011, as computed for federal income tax purposes, were as 
Aggregate follows: cost  $ 235,851,966 
Gross unrealized appreciation  $     6,069,964 
Gross unrealized depreciation (8,187,272) 
Net unrealized  depreciation  $    (2,117,308)


(a) Variable rate security. Rate shown is as of report date.

(b) When-issued security. Unsettled when-issued transactions were as
follows:

    Unrealized 
Counterparty  Value  Appreciation 
Citigroup Global Markets, Inc.  $ 1,358,691 $ 13,719 


(c) Securities represent bonds transferred to a tender option bond trust in

exchange for which the Fund acquired residual interest certificates.
These securities serve as collateral in a financing transaction.
(d) Investments in companies considered to be an affiliate of the Fund
during the period, for purposes of Section 2(a)(3) of the Investment
Company Act of 1940, as amended, were as follows:

  Shares    Shares   
  Held at    Held at   
  July 31,  Net  April 30,   
Affiliate  2010  Activity  2011  Income 
FFI Institutional         
Tax-Exempt         
Fund  7,411,011  (2,285,349)  5,125,662  $ 4,511 


(e) Represents the current yield as of report date.

4 BLACKROCK MUNIYIELD INVESTMENT FUND  APRIL 30, 2011 

 



BlackRock MuniYield Investment Fund (MYF)
Scheduleof Investments (concluded)

  Financial futures contracts sold as of April 30, 2011 were as follows:       
          Notional  Unrealized 
  Contracts  Issue  Exchange  Expiration  Value  Depreciation 
  132  10-Year U.S. Treasury Note  Chicago Board of Trade  June 2011  $ 15,643,812  $ (346,751) 


•Fair Value Measurements - Various inputs are used in determining the fair

value of investments and derivative financial instruments. These inputs
are summarized in three broad levels for financial reporting purposes as
follows

•Level 1 — price quotations in active markets/exchanges for identical
assets and liabilities

•Level 2 — other observable inputs (including, but not limited to: quoted
prices for similar assets or liabilities in markets that are active, quoted
prices for identical or similar assets or liabilities in markets that are not
active, inputs other than quoted prices that are observable for the
assets or liabilities (such as interest rates, yield curves, volatilities,
prepayment speeds, loss severities, credit risks and default rates) or
other market-corroborated inputs)

•Level 3 — unobservable inputs based on the best information available
in the circumstances, to the extent observable inputs are not available
(including the Fund's own assumptions used in determining the fair
value of investments and derivative financial instruments)

The inputs or methodologies used for valuing securities are not necessarily
an indication of the risk associated with investing in those securities. For
information about the Fund's policy regarding valuation of investments and
derivative financial instruments and other significant accounting policies,
please refer to the Fund’s most recent financial statements as contained in
its semi-annual report.

The following tables summarize the inputs used as of April 30, 2011 in
determining the fair valuation of the Fund's investments and derivative
financial instruments:

Valuation Inputs  Level 1  Level 2  Level 3  Total 
Assets:         
Investments:         
Long-Term         
Investments1  —           $290,242,983      —                 $ 290,242,983 
Short-Term         
Securities  $ 5,125,662        —  5,125,662 
Total   $ 5,125,662          $290,242,983      —                  $ 295,368,645 
1See above Schedule of Investments for values in each state or political 
subdivision.         

 

Valuation Inputs  Level 1  Level 2  Level 3  Total 
Derivative Financial Instruments2         
Liabilities:         
Interest rate contracts  $ (346,751)    $ (346,751) 
2Derivative financial instruments are financial futures contracts, which are valued at the 
unrealized appreciation/depreciation on the instrument.     

 

BLACKROCK MUNIYIELD INVESTMENT FUND  APRIL 30, 2011  5 

 



Item 2 – Controls and Procedures

2(a) – The registrant's principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant's disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
31940 Act3)) areeffective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter
that have materially affected, or are reasonably likely to materially affect, the registrant's
internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

BlackRock MuniYield Investment Fund

By: /S/ John M. Perlowski
John M. Perlowski
Chief Executive Officer of
BlackRock MuniYield Investment Fund

Date: June 24, 2011

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /S/ John M. Perlowski
John M. Perlowski
Chief Executive Officer (principal executive officer) of
BlackRock MuniYield Investment Fund

Date: June 24, 2011

By: /S/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock MuniYield Investment Fund

Date: June 24, 2011