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: 08/31/2015

Date of reporting period: 05/31/2015

 


Item 1 – Schedule of Investments


Schedule of Investments May 31, 2015 (Unaudited)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds   

Par  

(000)

    Value  

Alabama — 3.5%

    

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

    

6.13%, 6/01/34

   $ 4,980      $ 5,760,715   

6.00%, 6/01/39

     10,995        12,638,642   

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

     1,745        1,966,755   
    

 

 

 
               20,366,112   

California — 22.8%

    

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

     8,920        9,975,058   

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

     5,370        6,379,130   

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

    

5.50%, 5/01/28

     3,330        3,903,692   

5.25%, 5/01/33

     2,600        2,931,526   

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

    

5.63%, 12/01/33

     2,450        2,837,223   

5.75%, 12/01/36

     3,285        3,797,230   

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

     4,450        5,063,833   

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

     5,600        6,251,168   

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

     4,365        5,129,137   

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

     3,485        4,012,176   

Los Angeles Community College District California, GO:

    

Election of 2001, Series A (NPFGC), 5.00%, 8/01/17 (a)

     10,000        10,896,800   

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

     3,375        3,932,989   
Municipal Bonds   

Par  

(000)

    Value  

California (concluded)

    

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

   $ 5,000      $ 5,540,700   

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

     2,980        3,372,049   

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

     4,110        4,761,106   

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

     4,690        5,356,684   

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

     15,000        17,341,950   

State of California Public Works Board, LRB, Various Capital Projects, Series I:

    

5.50%, 11/01/30

     4,500        5,372,325   

5.50%, 11/01/31

     2,615        3,106,855   

5.50%, 11/01/33

     2,000        2,376,360   

State of California Public Works Board, RB, Department of Corrections & Rehabilitation, Series F, 5.25%, 9/01/33

     2,240        2,609,600   

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

     1,685        1,980,616   

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

     12,250        14,002,485   
    

 

 

 
               130,930,692   

Colorado — 2.1%

    

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

    

5.50%, 11/15/28

     2,700        3,130,245   

5.50%, 11/15/30

     1,040        1,194,461   

5.50%, 11/15/31

     1,250        1,428,750   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015    1


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds   

Par  

(000)

    Value  
Colorado (concluded)             

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

   $ 5,925      $ 6,667,106   
    

 

 

 
               12,420,562   
Florida — 9.5%             

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

     1,250        1,435,213   

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

    

5.50%, 10/01/29

     5,360        6,141,756   

5.25%, 10/01/30

     3,255        3,646,251   

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

     7,100        7,770,595   

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

     350        356,419   

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

    

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

     3,500        3,893,960   

5.00%, 10/01/31

     5,465        6,032,486   

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

     2,870        3,299,782   

County of Miami-Dade Florida, Seaport Department, RB:

    

Series A, 5.38%, 10/01/33

     3,145        3,542,685   

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

     1,405        1,716,390   

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

     1,885        2,251,764   

County of Osceola Florida, RB, Sales Tax, Series A:

    

5.00%, 10/01/40

     2,165        2,400,898   

5.00%, 10/01/44

     4,970        5,468,392   

Florida Housing Finance Corp., Refunding RB, S/F Housing, Homeowner Mortgage, Series 2, AMT (NPFGC), 5.90%, 7/01/29

     3,065        3,083,605   
Municipal Bonds   

Par  

(000)

    Value  
Florida (concluded)             

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

   $ 3,225      $ 3,688,658   
    

 

 

 
               54,728,854   
Hawaii — 0.8%             

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

    

5.25%, 8/01/25

     1,350        1,556,320   

5.25%, 8/01/26

     2,500        2,856,875   
    

 

 

 
               4,413,195   
Illinois — 26.9%             

Chicago Midway International Airport, Refunding ARB, 2nd Lien, Series A, AMT, 5.00%, 1/01/33

     4,355        4,665,512   

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

    

Series A, 5.75%, 1/01/39

     7,395        8,402,865   

Series C, 6.50%, 1/01/41

     16,800        20,226,024   

City of Chicago Illinois, Refunding RB, Sales Tax, Series A, 5.25%, 1/01/38

     2,445        2,568,350   

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

    

5.50%, 1/01/30

     6,500        7,258,680   

5.50%, 1/01/32

     6,275        6,963,618   

City of Chicago Illinois Midway International Airport, Refunding GARB, 2nd Lien, Series A, AMT, 5.00%, 1/01/41

     8,020        8,436,960   

City of Chicago Illinois Transit Authority, RB:

    

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

     6,315        7,047,919   

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

     1,960        2,076,091   

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

     10,960        11,532,660   

Sales Tax Receipts, 5.00%, 12/01/44

     8,420        8,802,352   

Sales Tax Receipts, 5.00%, 12/01/44

     2,500        2,687,875   

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

     7,735        8,129,021   

 

                
2    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds   

Par  

(000)

    Value  

Illinois (concluded)

    

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

    

5.50%, 12/01/38

   $ 2,895      $ 3,252,069   

5.25%, 12/01/43

     6,305        6,920,872   

Illinois Finance Authority, RB:

    

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

     4,000        4,680,120   

University of Chicago, Series B, 5.50%, 7/01/18 (a)

     10,000        11,277,200   

Railsplitter Tobacco Settlement Authority, RB:

    

5.50%, 6/01/23

     4,365        5,072,130   

6.00%, 6/01/28

     1,245        1,469,785   

State of Illinois, GO:

    

5.25%, 2/01/31

     2,700        2,812,401   

5.25%, 2/01/32

     5,525        5,731,027   

5.50%, 7/01/33

     7,820        8,388,827   

5.50%, 7/01/38

     1,295        1,376,520   

5.00%, 2/01/39

     5,000        5,048,700   
    

 

 

 
               154,827,578   

Indiana — 3.6%

    

Indiana Finance Authority, RB, Private Activity Bond, Ohio River Bridges, Series A, AMT, 5.00%, 7/01/40

     1,240        1,303,922   

Indiana Municipal Power Agency, Refunding RB, Series A:

    

5.25%, 1/01/32

     1,500        1,717,575   

5.25%, 1/01/33

     1,500        1,716,435   

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

     14,105        15,931,597   
    

 

 

 
               20,669,529   

Louisiana — 1.9%

    

City of New Orleans Louisiana Aviation Board, RB, Series B, AMT, 5.00%, 1/01/45

     4,995        5,372,922   

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

    

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

     500        573,410   

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

     720        822,470   
Municipal Bonds   

Par  

(000)

    Value  

Louisiana (concluded)

    

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

   $ 3,735      $ 4,116,456   
    

 

 

 
               10,885,258   

Massachusetts — 0.5%

    

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

    

5.00%, 1/01/26

     820        906,764   

5.00%, 1/01/27

     2,000        2,196,360   
    

 

 

 
               3,103,124   

Michigan — 3.6%

    

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

     6,320        6,891,012   

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

     6,015        6,583,538   

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

     5,780        7,090,095   
    

 

 

 
               20,564,645   

Minnesota — 2.0%

    

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

     9,900        11,456,775   

Mississippi — 2.8%

    

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

    

6.88%, 12/01/40

     6,405        8,204,741   

Special Obligation, 6.75%, 12/01/31

     3,775        4,876,771   

Special Obligation, 6.75%, 12/01/33

     2,350        3,024,568   
    

 

 

 
               16,106,080   

Nebraska — 1.5%

    

Omaha Public Power District, Refunding RB, Series A, 5.25%, 2/01/46

     7,500        8,568,300   

Nevada — 5.4%

    

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

     11,175        12,514,771   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015    3


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds   

Par  

(000)

    Value  

Nevada (concluded)

    

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

   $ 11,245      $ 12,277,966   

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

     5,850        6,611,260   
    

 

 

 
               31,403,997   

New Jersey — 7.3%

    

New Jersey EDA, RB:

    

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

     4,280        4,980,979   

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

     70        80,273   

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

     7,000        7,619,220   

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

     2,425        2,686,124   

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

     6,500        7,205,250   

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

     4,475        4,913,147   

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

    

Series A, 5.50%, 6/15/41

     5,410        5,649,771   

Series AA, 5.50%, 6/15/39

     8,175        8,636,724   
    

 

 

 
               41,771,488   

New York — 8.0%

    

City of New York New York Municipal Water Finance Authority, Refunding RB:

    

2nd General Resolution, Fiscal 2009, Series EE, 5.25%, 6/15/40

     7,500        8,523,225   

Water & Sewer System, 2nd General Resolution, Series EE, 5.38%, 6/15/43

     3,475        4,066,723   

Water & Sewer System, Series FF-2, 5.50%, 6/15/40

     4,000        4,603,200   

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

     4,000        4,560,680   

County of Nassau New York, GO, General Improvement, Series B, 5.00%, 4/01/35 (b)

     3,000        3,320,190   
Municipal Bonds   

Par  

(000)

    Value  

New York (concluded)

    

Metropolitan Transportation Authority, RB:

    

Series A, 5.25%, 11/15/38

   $ 4,000      $ 4,545,120   

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

     4,490        5,099,787   

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

     10,000        11,222,900   
    

 

 

 
               45,941,825   

Ohio — 1.5%

    

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

    

5.25%, 2/15/31

     5,145        5,905,894   

5.25%, 2/15/32

     2,250        2,571,143   
    

 

 

 
               8,477,037   

Pennsylvania — 2.4%

    

Pennsylvania Economic Development Financing Authority, RB, AMT, Pennsylvania Bridges Finco LP:

    

5.00%, 12/31/34

     3,700        4,007,877   

5.00%, 12/31/38

     865        928,975   

Pennsylvania Turnpike Commission, RB, Sub-Series A, 6.00%, 12/01/16 (a)

     4,945        5,348,364   

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

     3,000        3,404,100   
    

 

 

 
               13,689,316   

South Carolina — 4.7%

    

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

     6,735        7,750,099   

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

    

5.25%, 7/01/25

     4,490        5,202,024   

5.50%, 7/01/38

     3,000        3,356,640   

6.00%, 7/01/38

     5,270        6,086,587   

5.50%, 7/01/41

     4,170        4,659,558   
    

 

 

 
               27,054,908   

Texas — 16.8%

    

Central Texas Transportation Commission Turnpike System, Refunding RB, Series C, 5.00%, 8/15/42

     4,000        4,261,560   

 

                
4    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

(Percentages shown are based on Net Assets)

 

Municipal Bonds   

Par  

(000)

    Value  

Texas (concluded)

    

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

   $ 4,190      $ 4,757,116   

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

    

6.00%, 11/15/35

     12,700        14,988,667   

6.00%, 11/15/36

     9,435        11,135,281   

5.38%, 11/15/38

     5,000        5,658,750   

County of Tarrant Texas Cultural Education Facilities Finance Corp., Refunding RB, Christus Health, Series A (AGC):

    

6.50%, 1/01/19 (a)

     320        376,800   

6.50%, 7/01/37

     1,450        1,653,754   

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

     9,110        10,143,803   

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

    

Series A, 5.00%, 11/01/38

     5,580        5,885,561   

Series H, 5.00%, 11/01/37

     4,575        4,879,741   

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

     3,735        4,345,897   

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

    

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

     5,555        6,481,074   

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

     12,150        13,702,041   

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

     7,170        8,150,067   
    

 

 

 
        96,420,112   

Virginia — 1.2%

    

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

     1,750        1,923,740   

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

     4,300        5,084,621   
    

 

 

 
        7,008,361   

Washington — 1.5%

    

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

     4,200        4,740,750   
Municipal Bonds   

Par  

(000)

    Value  

Washington (concluded)

    

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

   $ 3,290      $ 3,778,828   
    

 

 

 
        8,519,578   

Total Municipal Bonds130.3%

  

    749,327,326   
    
                  

Municipal Bonds Transferred to

Tender Option Bond Trusts (c)

              

California — 2.0%

    

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

     7,960        8,503,190   

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

     2,400        2,702,928   
    

 

 

 
        11,206,118   

District of Columbia — 0.7%

    

District of Columbia Water & Sewer Authority, Refunding RB, Senior Lien, Series A, 6.00%, 10/01/18 (a)(d)

     3,378        3,913,544   

Florida — 2.2%

    

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

     10,657        11,791,250   

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

     1,116        1,134,910   
    

 

 

 
        12,926,160   

Indiana — 1.8%

    

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

     9,850        10,488,182   

Kentucky — 0.1%

    

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

     404        456,790   

Nevada — 2.6%

    

County of Clark Nevada Water Reclamation District, GO:

    

Limited Tax, 6.00%, 7/01/38

     8,000        9,115,200   

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015    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 Trusts (c)

  

Par  

(000)

    Value  

Nevada (concluded)

    

County of Clark Nevada Water Reclamation District, GO (concluded):

    

Series B, 5.50%, 7/01/29

   $ 5,008      $ 5,771,191   
    

 

 

 
               14,886,391   

New Jersey — 3.4%

    

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

     7,402        7,814,111   

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

    

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

     8,000        8,674,480   

Series B, 5.25%, 6/15/36 (d)

     2,961        3,032,907   
    

 

 

 
               19,521,498   

New York — 11.0%

    

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        5,747,462   

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

     5,619        6,258,248   

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

     9,249        10,558,385   

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

     13,950        15,917,926   

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

     8,200        9,458,208   

Municipal Bonds Transferred to

Tender Option Bond Trusts (c)

  

Par  

(000)

    Value  

New York (concluded)

    

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

   $ 13,500      $ 15,193,035   
    

 

 

 
        63,133,264   

Texas — 4.3%

    

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

     12,027        13,524,278   

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

     9,640        11,280,632   
    

 

 

 
        24,804,910   

Utah — 1.2%

    

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

     6,371        6,955,820   

Total Municipal Bonds Transferred to

Tender Option Bond Trusts29.3%

    168,292,677  

Total Long-Term Investments

(Cost — $834,973,086) — 159.6%

  

  

    917,620,003   
    
                  
Short-Term Securities    Shares         

FFI Institutional Tax-Exempt Fund, 0.02% (e)(f)

     13,809,281        13,809,281   

Total Short-Term Securities

(Cost — $13,809,281) — 2.4%

  

  

    13,809,281   
Total Investments (Cost — $848,782,367*) — 162.0%        931,429,284   
Other Assets Less Liabilities0.7%        3,802,140   

Liability for TOB Trust Certificates, Including Interest
Expense and Fees Payable
(14.9%)

   

    (85,655,253
VRDP Shares, at Liquidation Value(47.8%)        (274,600,000
    

 

 

 
Net Assets Applicable to Common Shares100.0%      $ 574,976,171   
    

 

 

 

 

*   As of May 31, 2015, gross unrealized appreciation and depreciation based on cost for federal income tax purposes were as follows:

 

Tax cost

  $ 764,420,892   
 

 

 

 

Gross unrealized appreciation

  $ 83,470,808   

Gross unrealized depreciation

    (2,088,663
 

 

 

 

Net unrealized appreciation

  $ 81,382,145   
 

 

 

 

 

Notes to Schedule of Investments

 

(a)   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.

 

                
6    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015   


Schedule of Investments (continued)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

 

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

 

Counterparty      Value        Unrealized
Appreciation
 

JP Morgan Clearing Corp.

     $ 3,320,190         $ 54,780   

 

(c)   Represent bonds transferred to a TOB Trust in exchange of cash and residual interest certificates received by the Trust. These bonds serve as collateral in a secured borrowing.

 

(d)   All or a portion of security is subject to a recourse agreement, which may require the Trust 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 or in the event of a default on the security. In the case of a shortfall or default, the aggregate maximum potential amount the Trust could ultimately be required to pay under the agreements, which expire from October 1, 2016 to November 15, 2019 is $22,519,117.

 

(e)   During the period ended May 31, 2015, investments in issuers considered to be an affiliate of the Trust for purposes of Section 2(a)(3) of the Investment Company Act 1940, as amended, were as follows:

 

Affiliate      Shares Held
at August 31,
2014
       Net
Activity
      

Shares Held

at May 31,

2015

       Income  

FFI Institutional Tax-Exempt Fund

       6,198,367           7,610,914           13,809,281         $ 2,244   

 

(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
GARB    General Airport Revenue Bonds
GO    General Obligation Bonds
IDA    Industrial Development Authority
IDB    Industrial Development Board
LRB    Lease Revenue Bonds
NPFGC    National Public Finance Guarantee Corp.
Q-SBLF    Qualified School Bond Loan Fund
RB    Revenue Bonds
S/F    Single-Family

 

 

As of May 31, 2015, financial futures contracts outstanding were as follows:

 

Contracts
Short
    Issue   Exchange   Expiration   Notional
Value
    Unrealized
Depreciation
 
  (429   10-Year U.S. Treasury Note   Chicago Board of Trade   September 2015   $ 54,777,938      $ (174,903

 

                
   BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015    7


Schedule of Investments (concluded)

  

BlackRock MuniHoldings Investment Quality Fund (MFL)

 

 

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. 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. 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. The three levels of the fair value hierarchy are as follows:

 

   

Level 1 — unadjusted quoted prices in active markets/exchanges for identical assets or liabilities that the Trust has the ability to access

 

   

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 Trust’s own assumptions used in determining the fair value of investments and derivative financial instruments)

Changes in valuation techniques may result in transfers into or out of an assigned level within the disclosure hierarchy. In accordance with the Trust’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. For information about the Trust’s policy regarding valuation of investments and derivative financial instruments, refer to the Trust’s most recent financial statements as contained in its semi-annual report.

As of May 31, 2015, the following tables summarize the Trust’s investments and derivative financial instruments categorized in the disclosure hierarchy:

 

     Level 1        Level 2        Level 3      Total  

Assets:

                
Investments:                 

Long-Term Investments 1

            $ 917,620,003              $ 917,620,003   

Short-Term Securities

  $ 13,809,281                          13,809,281   
 

 

 

      

 

 

      

 

    

 

 

 

Total

  $ 13,809,281         $ 917,620,003              $ 931,429,284   
 

 

 

      

 

 

      

 

    

 

 

 

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

  $ (174,903                     $ (174,903

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

       

The Trust may hold assets and/or liabilities in which the fair value approximates the carrying amount for financial reporting purposes. As of May 31, 2015, 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

  $ 579,150                        $ 579,150   

Liabilities:

                

TOB Trust Certificates

            $ (85,626,247             (85,626,247

VRDP Shares

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

 

 

      

 

 

      

 

    

 

 

 

Total

  $ 579,150         $ (360,226,247           $ (359,647,097
 

 

 

      

 

 

      

 

    

 

 

 

During the period ended May 31, 2015, there were no transfers between levels.

  

 

                
8    BLACKROCK MUNIHOLDINGS INVESTMENT QUALITY FUND    MAY 31, 2015   


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, 2015

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, 2015

 

By:  

/s/ Neal J. Andrews

  Neal J. Andrews
  Chief Financial Officer (principal financial officer) of
  BlackRock MuniHoldings Investment Quality Fund
Date:   July 23, 2015