BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND

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 811-08349

Name of Fund: BlackRock MuniHoldings Investment Quality Fund (MFL)

Fund Address:   100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John M. Perlowski, Chief Executive Officer, BlackRock

          MuniHoldings Investment Quality 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: 08/31/2014

Date of reporting period: 05/31/2014


Item 1 – Schedule of Investments


Schedule of Investments May 31, 2014(Unaudited)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds    Par  
(000)
    Value  

Alabama — 3.6%

                

City of Birmingham Alabama Special Care Facilities Financing Authority, RB, Children’s Hospital (AGC):

    

6.13%, 6/01/34

   $ 4,980      $ 5,807,327   

6.00%, 6/01/39

     10,995        12,757,389   

City of Selma Alabama IDB, RB, Gulf Opportunity Zone, International Paper Co. Project, Series A, 5.38%, 12/01/35

     1,745        1,875,212   
    

 

 

 
               20,439,928   

California — 22.8%

    

California Educational Facilities Authority, RB, University of Southern California, Series A, 5.25%, 10/01/38

     8,920        10,156,936   

California Health Facilities Financing Authority, RB, Sutter Health, Series B, 6.00%, 8/15/42

     5,370        6,463,815   

California State Public Works Board, LRB:

    

Department of Corrections & Rehabilitation, Series F, 5.25%, 9/01/33

     2,240        2,564,576   

Various Capital Projects, Series I, 5.50%, 11/01/30

     4,500        5,372,190   

Various Capital Projects, Series I, 5.50%, 11/01/31

     2,615        3,105,391   

Various Capital Projects, Series I, 5.50%, 11/01/33

     2,000        2,375,060   

City & County of San Francisco California Airports Commission, Refunding ARB, 2nd Series A, AMT:

    

5.50%, 5/01/28

     3,330        3,866,829   

5.25%, 5/01/33

     2,600        2,918,422   

City of Manteca California Financing Authority, RB, Manteca Sewer (AGC):

    

5.63%, 12/01/33

     2,450        2,733,196   

5.75%, 12/01/36

     3,285        3,667,703   

City of San Jose California, Refunding ARB, Series A-1, AMT, 5.75%, 3/01/34

     4,450        5,007,852   

County of Sacramento California, ARB, Senior Series A (AGC), 5.50%, 7/01/41

     5,600        6,378,288   

Kern Community College District, GO, Safety, Repair & Improvement, Election of 2002, Series C, 5.50%, 11/01/33

     4,365        5,171,870   
Municipal Bonds    Par  
(000)
    Value  

California (concluded)

                

Los Angeles California Unified School District, GO, Election of 2002, Series D, 5.25%, 7/01/25

   $ 3,485      $ 4,128,889   

Los Angeles Community College District California, GO:

    

Election of 2001, Series A (NPFGC), 5.00%, 8/01/32

     10,000        11,083,100   

Election of 2008, Series C, 5.25%, 8/01/39

     3,375        3,899,104   

Los Angeles Department of Water & Power, RB, Power System, Sub-Series A-1, 5.25%, 7/01/38

     5,000        5,648,150   

Los Angeles Municipal Improvement Corp., Refunding LRB, Real Property, Series B (AGC), 5.50%, 4/01/39

     2,980        3,414,454   

Redondo Beach Unified School District, GO, Election of 2008, Series E, 5.50%, 8/01/34

     4,110        4,671,673   

San Diego Public Facilities Financing Authority Water, Refunding RB, Series B (AGC), 5.38%, 8/01/34

     4,690        5,405,272   

State of California, GO, Various Purposes (AGC), 5.50%, 11/01/39

     15,000        17,267,250   

Township of Washington California Health Care District, GO, Election of 2004, Series B, 5.50%, 8/01/40

     1,685        1,974,331   

University of California, Refunding RB, The Regents of Medical Center, Series J, 5.25%, 5/15/38

     12,250        13,805,872   
    

 

 

 
               131,080,223   

Colorado — 2.2%

    

City & County of Denver Colorado Airport System, ARB, Series A, AMT:

    

5.50%, 11/15/28

     2,700        3,075,597   

5.50%, 11/15/30

     1,040        1,174,066   

5.50%, 11/15/31

     1,250        1,400,613   

Colorado Health Facilities Authority, RB, Hospital, NCMC, Inc. Project, Series B (AGM), 6.00%, 5/15/26

     5,925        6,783,947   
    

 

 

 
               12,434,223   

Florida — 9.3%

    

City of Jacksonville Florida, Refunding RB, Series A, 5.25%, 10/01/33

     1,250        1,416,488   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014    1


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

 

Municipal Bonds  

Par  

(000)

    Value  

Florida (concluded)

               

County of Hillsborough Florida Aviation Authority, Refunding ARB, Tampa International Airport, Series A, AMT:

   

5.50%, 10/01/29

  $ 5,360      $ 6,070,254   

5.25%, 10/01/30

    3,255        3,598,598   

County of Lee Florida, Refunding ARB, Series A, AMT, 5.38%, 10/01/32

    7,100        7,768,465   

County of Manatee Florida Housing Finance Authority, RB, S/F Housing, Series A, AMT (Ginnie Mae, Fannie Mae & Freddie Mac), 5.90%, 9/01/40

    465        474,295   

County of Miami-Dade Florida, RB, Seaport:

   

Series A, 5.38%, 10/01/33

    3,145        3,501,014   

Series B, AMT, 6.25%, 10/01/38

    1,405        1,657,591   

Series B, AMT, 6.00%, 10/01/42

    1,885        2,173,028   

County of Miami-Dade Florida, Refunding RB, Water & Sewer System, Series B, 5.25%, 10/01/29

    5,870        6,813,720   

County of Miami-Dade Florida Aviation, Refunding ARB, Series A, AMT:

   

Miami International Airport (AGM), 5.50%, 10/01/41

    3,500        3,949,925   

5.00%, 10/01/31

    5,465        5,933,624   

County of Miami-Dade Florida Housing Finance Authority, MRB, M/F Housing, Marbrisa Apartments Project, Series 2A, AMT (AGM), 6.00%, 8/01/26

    2,185        2,188,867   

Florida Housing Finance Corp., Refunding RB, S/F Housing, Homeowner Mortgage, Series 2, AMT (NPFGC):

   

5.75%, 7/01/14

    60        60,224   

5.90%, 7/01/29

    3,930        3,957,313   

Reedy Creek Improvement District, GO, Series A, 5.25%, 6/01/32

    3,225        3,660,278   
   

 

 

 
              53,223,684   

Hawaii — 0.7%

   

State of Hawaii, Department of Transportation, COP, AMT:

   

5.25%, 8/01/25

    1,350        1,514,471   

5.25%, 8/01/26

    2,500        2,779,025   
   

 

 

 
              4,293,496   
Municipal Bonds  

Par  

(000)

    Value  

Illinois — 24.7%

               

City of Chicago Illinois, GARB, O’Hare International Airport, 3rd Lien:

   

Series A, 5.75%, 1/01/39

  $ 7,395      $ 8,361,305   

Series C, 6.50%, 1/01/41

    16,800        19,816,776   

City of Chicago Illinois, GO, Refunding, Project, Series A:

   

5.25%, 1/01/29

    3,635        3,897,920   

5.25%, 1/01/33

    2,640        2,786,362   

City of Chicago Illinois, Refunding RB, Series A:

   

Sales Tax, 5.25%, 1/01/38

    2,445        2,631,602   

Waterworks, 2nd Lien (AMBAC), 5.00%, 11/01/36

    5,305        5,576,828   

City of Chicago Illinois Midway Airport, Refunding ARB, 2nd Lien, Series A, AMT:

   

5.50%, 1/01/30

    6,500        7,257,445   

5.50%, 1/01/32

    6,275        6,924,337   

5.00%, 1/01/41 (a)

    2,020        2,121,949   

City of Chicago Illinois Transit Authority, RB:

   

Federal Transit Administration, Section 5309, Series A (AGC), 6.00%, 6/01/26

    6,315        7,002,640   

Sales Tax Receipts, 5.25%, 12/01/36

    1,960        2,138,674   

Sales Tax Receipts, 5.25%, 12/01/40

    10,960        11,921,850   

City of Chicago Illinois Transit Authority, Refunding RB, Federal Transit Administration, Section 5309 (AGM), 5.00%, 6/01/28

    7,735        8,258,969   

County of Cook Illinois Community College District No. 508, GO, City College of Chicago:

   

5.50%, 12/01/38

    2,895        3,252,532   

5.25%, 12/01/43

    3,305        3,585,396   

Illinois Finance Authority, RB:

   

Carle Foundation, Series A, 6.00%, 8/15/41

    4,000        4,566,320   

University of Chicago, Series B, 5.50%, 7/01/37

    10,000        11,270,100   

Railsplitter Tobacco Settlement Authority, RB:

   

5.50%, 6/01/23

    4,365        5,119,927   

6.00%, 6/01/28

    1,245        1,457,895   

State of Illinois, GO:

   

5.25%, 2/01/31

    2,700        2,947,914   

5.25%, 2/01/32

    5,525        6,000,095   

5.50%, 7/01/33

    7,820        8,674,491   

5.50%, 7/01/38

    1,295        1,416,924   

 

                
2    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds  

Par  

(000)

    Value  

Illinois (concluded)

               

State of Illinois, GO (concluded):

   

5.00%, 2/01/39

  $ 5,000      $ 5,205,900   
   

 

 

 
              142,194,151   

Indiana — 3.6%

   

Indiana Finance Authority, RB, Private Activity Bond, Ohio River Bridges East End Crossing Project, Series A, AMT:

   

5.00%, 7/01/40

    1,240        1,288,583   

5.00%, 7/01/44

    495        510,662   

Indiana Municipal Power Agency, Refunding RB, Series A:

   

5.25%, 1/01/32

    1,500        1,701,510   

5.25%, 1/01/33

    1,500        1,692,795   

Indianapolis Local Public Improvement Bond Bank, Refunding RB, Waterworks Project, Series A (AGC), 5.50%, 1/01/38

    14,105        15,681,093   
   

 

 

 
              20,874,643   

Louisiana — 1.0%

   

City of New Orleans Louisiana Aviation Board, Refunding GARB, Restructuring (AGC):

   

Series A-1, 6.00%, 1/01/23

    500        577,010   

Series A-2, 6.00%, 1/01/23

    720        830,895   

Tobacco Settlement Financing Corp., Refunding RB, Asset-Backed, Series A, 5.50%, 5/15/29

    3,735        4,115,148   
   

 

 

 
              5,523,053   

Massachusetts — 0.8%

   

Massachusetts Educational Financing Authority, RB, Education Loan, Issue I, AMT (a):

   

5.00%, 1/01/26

    2,070        2,273,419   

5.00%, 1/01/27

    2,000        2,187,440   
   

 

 

 
              4,460,859   

Michigan — 5.8%

   

City of Detroit Michigan Sewage Disposal System, Refunding RB, Senior Lien (AGM):

   

Series B, 7.50%, 7/01/33

    2,780        3,051,578   

Series C-1, 7.00%, 7/01/27

    9,055        9,867,415   

City of Detroit Michigan Water Supply System, RB, 2nd Lien, Series B (AGM), 6.25%, 7/01/36

    6,320        6,450,571   
Municipal Bonds  

Par  

(000)

    Value  

Michigan (concluded)

               

Hudsonville Public Schools, GO, School Building & Site (Q-SBLF), 5.25%, 5/01/41

  $ 6,015      $ 6,510,696   

Royal Oak Hospital Finance Authority, Refunding RB, William Beaumont Hospital, Series V, 8.25%, 9/01/18 (b)

    5,780        7,530,473   
   

 

 

 
              33,410,733   

Minnesota — 2.0%

   

City of Minneapolis Minnesota, Refunding RB, Fairview Health Services, Series B (AGC), 6.50%, 11/15/38

    9,900        11,686,257   

Mississippi — 3.3%

   

Mississippi Development Bank, RB, Special Obligation, Jackson Water & Sewer System Project (AGM):

   

6.75%, 12/01/31

    3,775        4,974,619   

6.75%, 12/01/33

    2,350        3,080,780   

6.88%, 12/01/40

    6,405        8,388,180   

Mississippi State University Educational Building Corp., Refunding RB, Mississippi State University Improvement Project, 5.25%, 8/01/38

    2,300        2,622,943   
   

 

 

 
              19,066,522   

Nevada — 5.4%

   

County of Clark Nevada, ARB, Las Vegas-McCarran International Airport, Series A (AGM), 5.25%, 7/01/39

    11,175        12,135,491   

County of Clark Nevada, GO, Limited Tax, 5.00%, 6/01/38

    11,245        12,186,431   

County of Clark Nevada Water Reclamation District, GO, Series A, 5.25%, 7/01/34

    5,850        6,714,806   
   

 

 

 
              31,036,728   

New Jersey — 7.5%

   

New Jersey EDA, RB:

   

Private Activity, The Goethals Bridge Replacement Project, AMT, 5.38%, 1/01/43

    7,000        7,477,470   

Private Activity, The Goethals Bridge Replacement Project, AMT (AGM), 5.00%, 1/01/31

    2,425        2,622,444   

School Facilities Construction (AGC), 6.00%, 12/15/18 (b)

    4,280        5,227,763   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014    3


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds  

Par  

(000)

    Value  

New Jersey (concluded)

               

New Jersey EDA, RB (concluded):

   

School Facilities Construction (AGC), 6.00%, 12/15/34

  $ 70      $ 81,353   

New Jersey Health Care Facilities Financing Authority, RB, Virtua Health, Series A (AGC), 5.50%, 7/01/38

    6,500        7,031,440   

New Jersey Higher Education Student Assistance Authority, Refunding RB, Series 1, AMT, 5.75%, 12/01/28

    4,475        5,064,984   

New Jersey Transportation Trust Fund Authority, RB:

   

Transportation Program, Series AA, 5.50%, 6/15/39

    8,175        9,296,937   

Transportation System, Series A, 5.50%, 6/15/41

    5,410        6,040,698   
   

 

 

 
              42,843,089   

New York — 8.9%

   

City of New York New York Municipal Water Finance Authority, Refunding RB, Water & Sewer System, 2nd General Resolution:

   

Fiscal 2009, Series EE, 5.25%, 6/15/40

    7,500        8,444,550   

Fiscal 2011, Series EE, 5.38%, 6/15/43

    3,475        3,996,041   

Series FF-2, 5.50%, 6/15/40

    4,000        4,572,360   

City of New York New York Transitional Finance Authority Building Aid, BARB, Fiscal 2009, Series S-4 (AGC), 5.50%, 1/15/29

    4,000        4,658,560   

Metropolitan Transportation Authority, RB:

   

Series A, 5.25%, 11/15/38

    4,000        4,411,760   

Series A-1, 5.25%, 11/15/39

    4,490        5,041,103   

Series B, 5.25%, 11/15/44

    8,000        8,954,160   

Port Authority of New York & New Jersey, Refunding ARB, Consolidated, 166th Series, 5.25%, 7/15/36

    10,000        11,284,700   
   

 

 

 
              51,363,234   

Ohio — 2.0%

   

State of Ohio Turnpike Commission, RB, Junior Lien, Infrastructure Projects, Series A-1:

   

5.25%, 2/15/30

    2,645        3,028,181   

5.25%, 2/15/31

    5,145        5,861,133   
Municipal Bonds  

Par  

(000)

    Value  

Ohio (concluded)

               

State of Ohio Turnpike Commission, RB, Junior Lien, Infrastructure Projects, Series A-1 (concluded):

   

5.25%, 2/15/32

  $ 2,250      $ 2,552,287   
   

 

 

 
              11,441,601   

Pennsylvania — 1.9%

   

Pennsylvania Turnpike Commission, RB:

   

Series A, 5.00%, 12/01/44

    2,030        2,230,117   

Sub-Series A, 6.00%, 12/01/41

    4,945        5,428,176   

Township of Bristol Pennsylvania School District, GO, 5.25%, 6/01/37

    3,000        3,350,850   
   

 

 

 
              11,009,143   

South Carolina — 4.7%

   

County of Charleston South Carolina, RB, Special Source, 5.25%, 12/01/38

    6,735        7,798,793   

County of Charleston South Carolina Airport District, ARB, Series A, AMT:

   

5.25%, 7/01/25

    4,490        5,197,265   

5.50%, 7/01/38

    3,000        3,306,240   

6.00%, 7/01/38

    5,270        6,010,119   

5.50%, 7/01/41

    4,170        4,605,640   
   

 

 

 
              26,918,057   

Texas — 16.0%

   

City of Beaumont Texas, GO, Certificates of Obligation, 5.25%, 3/01/37

    4,190        4,785,986   

City of Houston Texas Utility System, Refunding RB, Combined 1st Lien, Series A (AGC):

   

6.00%, 11/15/35

    12,700        14,932,533   

6.00%, 11/15/36

    9,435        11,117,827   

5.38%, 11/15/38

    5,000        5,675,200   

County of Tarrant Texas Cultural Education Facilities Finance Corp., Refunding RB, Christus Health, Series A (AGC), 6.50%, 7/01/37

    1,770        1,998,719   

Dallas Area Rapid Transit, Refunding RB, Senior Lien, 5.25%, 12/01/38

    9,110        10,302,954   

 

                
4    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds  

Par  

(000)

    Value  

Texas (concluded)

               

Dallas-Fort Worth International Airport, ARB, Joint Improvement, AMT:

   

Series A, 5.00%, 11/01/38

  $ 5,580      $ 5,860,730   

Series H, 5.00%, 11/01/37

    4,575        4,820,998   

Lower Colorado River Authority, Refunding RB, 5.50%, 5/15/33

    3,735        4,237,507   

North Texas Tollway Authority, Refunding RB, 1st Tier:

   

(AGM), 6.00%, 1/01/43

    5,555        6,285,149   

Series K-1 (AGC), 5.75%, 1/01/38

    12,150        13,878,945   

Red River Education Financing Corp., RB, Texas Christian University Project, 5.25%, 3/15/38

    7,170        8,182,045   
   

 

 

 
              92,078,593   

Virginia — 1.3%

   

City of Lexington Virginia IDA, RB, Washington & Lee University, 5.00%, 1/01/43

    1,750        1,934,555   

Virginia Public School Authority, RB, Fluvanna County School Financing, 6.50%, 12/01/18 (b)

    4,300        5,339,009   
   

 

 

 
              7,273,564   

Washington — 1.5%

   

City of Seattle Washington Municipal Light & Power, Refunding RB, Series A, 5.25%, 2/01/36

    4,200        4,710,552   

State of Washington, GO, Various Purposes, Series B, 5.25%, 2/01/36

    3,290        3,788,369   
   

 

 

 
              8,498,921   

Total Municipal Bonds129.0%

            741,150,702   
   

Municipal Bonds Transferred to

Tender Option Bond (TOB) Trusts (c)

 

Alabama — 1.2%

               

City of Mobile Alabama Board of Water & Sewer Commissioners, RB (NPFGC), 5.00%, 1/01/31

    6,500        6,828,965   

California — 2.0%

   

California State University, Refunding RB, Systemwide, Series A (AGM), 5.00%, 11/01/32

    7,960        8,761,731   

Municipal Bonds Transferred to

Tender Option Bond (TOB) Trusts (c)

 

Par  

(000)

    Value  

California (concluded)

               

Los Angeles Unified School District California, GO, Series I, 5.00%, 1/01/34

  $ 2,400      $ 2,706,168   
   

 

 

 
              11,467,899   

District of Columbia — 0.7%

   

District of Columbia Water & Sewer Authority, Refunding RB, Senior Lien, Series A, 6.00%, 10/01/35 (d)

    3,379        3,897,973   

Florida — 2.3%

   

County of Hillsborough Florida Aviation Authority, ARB, Tampa International Airport, Series A, AMT (AGC), 5.50%, 10/01/38

    10,657        11,868,322   

County of Lee Florida Housing Finance Authority, RB, S/F Housing, Multi-County Program, Series A-2, AMT (Ginnie Mae), 6.00%, 9/01/40

    1,515        1,571,858   
   

 

 

 
              13,440,180   

Indiana — 1.8%

   

Indiana Health & Educational Facilities Financing Authority, Refunding RB, St. Francis, Series E (AGM), 5.25%, 5/15/41

    9,850        10,409,382   

Kentucky — 0.1%

   

Kentucky State Property & Building Commission, Refunding RB, Project No. 93 (AGC), 5.25%, 2/01/27

    404        463,104   

Nevada — 2.6%

   

County of Clark Nevada Water Reclamation District, GO: Limited Tax, 6.00%, 7/01/38

    8,000        9,316,160   

Series B, 5.50%, 7/01/29

    5,008        5,917,583   
   

 

 

 
              15,233,743   

New Jersey — 3.5%

   

New Jersey Housing & Mortgage Finance Agency, RB, S/F Housing, Series CC, 5.25%, 10/01/29

    7,402        7,932,437   

New Jersey Transportation Trust Fund Authority, RB, Transportation System:

   

Series A (AMBAC), 5.00%, 12/15/32

    8,000        8,840,960   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014    5


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds Transferred to
Tender Option Bond (TOB) Trusts (c)
   Par  
(000)
    Value  

New Jersey (concluded)

                

New Jersey Transportation Trust Fund Authority, RB, Transportation System (concluded): Series B, 5.25%, 6/15/36 (d)

   $ 2,961      $ 3,260,117   
    

 

 

 
               20,033,514   

New York — 10.9%

    

City of New York New York Municipal Water Finance Authority, Refunding RB, Water & Sewer System, 2nd General Resolution, Series FF-2, 5.50%, 6/15/40

     4,994        5,708,950   

City of New York New York Transitional Finance Authority, BARB, Fiscal 2009, Series S-3, 5.25%, 1/15/39

     5,619        6,323,201   

Hudson Yards Infrastructure Corp., RB, Fiscal 2012, Series A, 5.75%, 2/15/47 (d)

     9,249        10,564,860   

New York Liberty Development Corp., RB, 1 World Trade Center Port Authority Consolidated Bonds, 5.25%, 12/15/43

     13,950        15,371,087   

New York Liberty Development Corp., Refunding RB, 4 World Trade Center Project, 5.75%, 11/15/51 (d)

     8,200        9,195,972   

New York State Dormitory Authority, ERB, Personal Income Tax, Series B, 5.25%, 3/15/38

     13,500        15,404,580   
    

 

 

 
               62,568,650   

Texas — 4.3%

    

City of San Antonio Texas Public Service Board, Refunding RB, Series A, 5.25%, 2/01/31 (d)

     12,027        13,721,049   
Municipal Bonds Transferred to
Tender Option Bond (TOB) Trusts (c)
   Par  
(000)
    Value  

Texas (concluded)

                

North Texas Tollway Authority, RB, Special Projects System, Series A, 5.50%, 9/01/41

   $ 9,640      $ 11,004,156   
    

 

 

 
               24,725,205   

Utah — 1.2%

    

City of Riverton Utah, RB, IHC Health Services, Inc., 5.00%, 8/15/41

     6,371        6,809,662   
Total Municipal Bonds Transferred to
Tender Option Bond (TOB) Trusts — 30.6%
        175,878,277   

Total Long-Term Investments

(Cost — $832,863,685) — 159.6%

  

  

    917,028,979   
    
   
Short-Term Securities — 2.8%    Shares         

FFI Institutional Tax-Exempt Fund, 0.03% (e)(f)

     15,830,156        15,830,156   

Total Short-Term Securities

(Cost — $15,830,156) — 2.8%

  

  

    15,830,156   

Total Investments

(Cost — $848,693,841*) — 162.4%

  

  

    932,859,135   
Other Assets Less Liabilities — 0.9%        5,395,905   

Liability for TOB Trust Certificates, Including Interest Expense and Fees Payable — (15.5%)

   

    (89,176,658
VRDP Shares, at Liquidation Value — (47.8%)        (274,600,000
    

 

 

 
Net Assets Applicable to Common Shares —100.0%      $ 574,478,382   

 

*   As of May 31, 2014, gross unrealized appreciation and depreciation based on cost for federal income tax purposes were as follows:

 

Tax cost

  $ 760,948,363   
 

 

 

 

Gross unrealized appreciation

  $ 84,192,342   

Gross unrealized depreciation

    (1,438,448
 

 

 

 

Net unrealized appreciation

  $ 82,753,894   
 

 

 

 

 

Notes to Schedule of Investments

 

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

 

Counterparty      Value        Unrealized
Appreciation/
Depreciation)
 

Barclays Capital, Inc.

     $ 2,121,949         $ (16,865

Morgan Stanley & Co. LLC

     $ 4,460,859         $ 54,386   

 

                
6    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

 

(b)   U.S. government securities, held in escrow, are used to pay interest on this security, as well as to retire the bond in full at the date indicated, typically at a premium to par.

 

(c)   Represent bonds transferred to a TOB. In exchange for which the Fund acquired residual interest certificates. These bonds serve as collateral in a financing transaction.

 

(d)   All or a portion of security is subject to a recourse agreement, which may require the Fund to pay the liquidity provider in the event there is a shortfall between the TOB trust certificates and proceeds received from the sale of the security contributed to the TOB trust. In the case of a shortfall, the aggregate maximum potential amount the Fund could ultimately be required to pay under the agreements, which expire from October 1, 2016 to November 15, 2019 is $22,520,646.

 

(e)   Investments in issuers considered to be an affiliate of the Fund during the period ended May 31, 2014, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

 

Affiliate      Shares Held
at August 31,
2013
      

Net

Activity

       Shares Held
at May 31,
2014
       Income  

FFI Institutional Tax-Exempt Fund

       27,631,574           (11,801,418        15,830,156         $ 2,199   

 

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

 

Portfolio Abbreviations

 

AGC      Assured Guarantee Corp.
AGM      Assured Guaranty Municipal Corp.
AMBAC      American Municipal Bond Assurance Corp.
AMT      Alternative Minimum Tax (subject to)
ARB      Airport Revenue Bonds
BARB      Building Aid Revenue Bonds
COP      Certificates of Participation
EDA      Economic Development Authority
ERB      Education Revenue Bonds
Fannie Mae      Federal National Mortgage Association
Freddie Mac      Federal Home Loan Mortgage Corp.
GARB      General Airport Revenue Bonds
Ginnie Mae      Government National Mortgage Association
GO      General Obligation Bonds
IDB      Industrial Development Board
LRB      Lease Revenue Bonds
M/F      Multi-Family
MRB      Mortgage Revenue Bonds
NPFGC      National Public Finance Guarantee Corp.
Q-SBLF      Qualified School Bond Loan Fund
RB      Revenue Bonds
S/F      Single-Family

 

Ÿ  

Financial futures contracts outstanding as of May 31, 2014 were as follows:

 

Contracts
Sold
    Issue   Exchange   Expiration  

Notional

Value

    Unrealized
Depreciation
 
  (663   10-Year U.S. Treasury Note   Chicago Board of Trade   September 2014   $ 83,216,859      $ (316,889

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014    7


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

 

Ÿ  

Fair Value Measurements—Various inputs are used in determining the fair value of investments and derivative financial instruments. These inputs to valuation techniques are categorized into a disclosure hierarchy consisting of three broad levels for financial reporting purposes as follows:

 

  Ÿ  

Level 1 — unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Fund has the ability to access

 

  Ÿ  

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)

 

  Ÿ  

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 hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Changes in valuation techniques may result in transfers into or out of an assigned level within the disclosure hierarchy. In accordance with the Fund’s policy, transfers between different levels of the fair value disclosure hierarchy are deemed to have occurred as of the beginning of the reporting period. The categorization of a value determined for investments and derivative financial instruments is based on the pricing transparency of the investment and derivative financial instrument and is not necessarily an indication of the risks associated with investing in those securities. For information about the Fund’s policy regarding valuation of investments and derivative financial instruments, please refer to the Fund’s most recent financial statements as contained in its semi-annual report.

The following tables summarize the Fund’s investments and derivative financial instruments categorized in the disclosure hierarchy as of May 31, 2014:

 

     Level 1        Level 2        Level 3        Total  

Assets:

                
Investments:                 

Long-Term Investments 1

            $ 917,028,979                   $ 917,028,979   

Short-Term Securities

  $ 15,830,156                               15,830,156   
 

 

 

      

 

 

      

 

 

      

 

 

 

Total

  $ 15,830,156         $ 917,028,979                   $ 932,859,135   
 

 

 

      

 

 

      

 

 

      

 

 

 

1   See above Schedule of Investments for values in each state or political subdivision.

 

      

     Level 1        Level 2        Level 3        Total  
Derivative Financial Instruments 2                 

Liabilities:

                
Interest rate contracts   $ (316,889                          $ (316,889

2   Derivative financial instruments are financial futures contracts, which are valued at the unrealized appreciation/depreciation on the instrument.

      

 

                
8    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

 

The Fund may hold assets and/or liabilities in which the fair value approximates the carrying amount for financial reporting purposes. As of May 31, 2014, such assets and/or liabilities are categorized within the disclosure hierarchy as follows:

 

     Level 1        Level 2        Level 3        Total  

Assets:

                

Cash pledged for financial futures contracts

  $ 872,000                             $ 872,000   

Liabilities:

                

TOB trust certificates

            $ (89,156,878                  (89,156,878

VRDP Shares

              (274,600,000                  (274,600,000
 

 

 

      

 

 

      

 

 

      

 

 

 

Total

  $ 872,000         $ (363,756,878                $ (362,884,878
 

 

 

      

 

 

      

 

 

      

 

 

 

 

There were no transfers between levels during the period ended May 31, 2014.

                

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2014    9


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 “1940 Act”)) are effective 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 MuniHoldings Investment Quality Fund

 

By:

 

/s/ John M. Perlowski

 

John M. Perlowski

 

Chief Executive Officer (principal executive officer) of

 

BlackRock MuniHoldings Investment Quality Fund

Date:

 

July 23, 2014

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 MuniHoldings Investment Quality Fund

Date:

 

July 23, 2014

By:

 

/s/ Neal J. Andrews

 

Neal J. Andrews

 

Chief Financial Officer (principal financial officer) of

 

BlackRock MuniHoldings Investment Quality Fund

Date:

 

July 23, 2014