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: 811-07111 Morgan Stanley Insured California Municipal Securities (Exact name of registrant as specified in charter) 1221 Avenue of the Americas, New York, New York 10020 (Address of principal executive offices) (Zip code) Ronald E. Robison 1221 Avenue of the Americas, New York, New York 10020 (Name and address of agent for service) Registrant's telephone number, including area code: 212-762-4000 Date of fiscal year end: October 31, 2006 Date of reporting period: July 31, 2006 ITEM 1. SCHEDULE OF INVESTMENTS. The Trust's schedule of investments as of the close of the reporting period prepared pursuant to Rule 12-12 of Regulation S-X is as follows: MORGAN STANLEY INSURED CALIFORNIA MUNICIPAL SECURITIES PORTFOLIO OF INVESTMENTS JULY 31, 2006 (UNAUDITED) PRINCIPAL AMOUNT IN COUPON MATURITY THOUSANDS RATE DATE VALUE --------- ---- ---- ----- CALIFORNIA TAX-EXEMPT MUNICIPAL BONDS (95.0%) General Obligation (11.0%) $505 California, Various Purposes Dtd 03/01/94 (FSA) 5.50% 03/01/20 $505,687 1,280 Huntington Beach Union High School District, Ser 2004 (FSA) 5.00 08/01/26 1,328,256 1,030 Los Angeles, Ser 2004 A (MBIA) 5.00 09/01/24 1,072,683 340 San Francisco City & County, Laguna Honda Hospital RITES PA 6.56++ 06/15/30 380,501 1387 (FSA) 1,000 Upland School District, Election 2000 Ser 2001 B (FSA) 5.125 08/01/25 1,049,110 1,375 Washington Unified School District, Election 2004 Ser A (FGIC) 5.00 08/01/22 1,432,145 ------ ----------- 5,530 5,768,382 ------ ----------- Educational Facilities Revenue (6.4%) 1,000 California State University, Ser 2005 A (Ambac) 5.00 11/01/35 1,032,480 University of California, 1,000 Limited Projects Ser 2005 B (FSA) 5.00 05/15/30 1,033,480 1,250 Multi Purpose Ser Q (FSA) 5.00 09/01/31 1,288,650 ------ ----------- 3,250 3,354,610 ------ ----------- Electric Revenue (6.1%) 1,000 Anaheim Public Financing Authority, Generation Refg Ser 2002-B 5.25 10/01/18 1,066,250 (FSA) 1,000 Los Angeles Department of Water & Power, 2001 Ser A (FSA) 5.25 07/01/21 1,050,250 1,000 Southern California Public Power Authority, Transmission 5.25 07/01/18 1,064,970 ------ Refg Ser 2002 A (FSA) ----------- 3,000 3,181,470 ------ ----------- Mortgage Revenue - Single Family (4.2%) 2,000 California Department of Veterans Affairs, Home Purchase 5.35 12/01/27 2,111,080 2002 Ser A (Ambac) 75 California Housing Financing Agency, 1995 Ser B (AMT) (Ambac) 6.25 08/01/14 75,770 ------ ----------- 2,075 2,186,850 ------ ----------- Public Facilities Revenue (6.1%) 1,110 Kern County Board of Education, Refg 2006 Ser A COPs (MBIA) 5.00 06/01/31 1,144,288 1,000 Simi Valley Public Financing Authority, Ser 2004 COPs (Ambac) 5.00 09/01/30 1,026,370 1,000 Val Verde Unified School District, School Construction COPs 5.00 01/01/30 1,027,260 ------ Ser 2005 B (FGIC) ----------- 3,110 3,197,918 ------ ----------- Resource Recovery Revenue (3.5%) Sacramento Financing Authority, 1,510 2005 Solid Waste & Redevelopment (FGIC) 5.00 12/01/17 1,610,325 180 1999 Solid Waste & Redevelopment (Ambac) 5.75 12/01/22 193,939 ------ ----------- 1,690 1,804,264 ------ ----------- Tax Allocation Revenue (8.8%) 250 Bay Area Government Association, Pool 1994 Ser A (FSA) 6.00 12/15/24 252,048 1,000 Capistrano Unified School District, Community Facilities 5.00 09/01/29 1,035,020 District #98-2 Ladera Special Tax Ser 2005 (FGIC) 1,100 La Quinta Financing Authority, Local Agency 2004 Ser A (Ambac) 5.25 09/01/24 1,171,060 80 Long Beach Bond Financing Authority, Downtown, North Long Beach, 5.375 08/01/21 85,882 Poly High and West Beach Areas 2002 Ser A (MBIA) 1,000 Rancho Mirage Redevelopment Agency, Ser 2003 A (MBIA) 5.00 04/01/33 1,021,820 1,000 San Jose Redevelopment Agency, Merged Area Ser 2002 (MBIA) 5.00 08/01/32 1,017,200 ------ ----------- 4,430 4,583,030 ------ ----------- Transportation Facilities Revenue (8.0%) 1,000 Los Angeles County Metropolitan Transportation Authority, Sales 5.25 07/01/30 1,043,010 Tax Ser 2000 A (FGIC) # 2,000 Orange County Transportation Authority, Toll Road Express Lanes 5.00 08/15/20 2,091,500 Refg Ser 2003 A (Ambac) 1,000 San Jose, Airport Ser 2001 A (FGIC) 5.00 03/01/25 1,021,080 ------ ----------- 4,000 4,155,590 ------ ----------- Water & Sewer Revenue (22.9%) 1,500 California Department of Water Resources, Central Valley Ser Y (FGIC) 5.25 12/01/19 1,606,890 2,000 East Bay Municipal Utility District, Water Ser 2001 (MBIA) 5.00 06/01/26 2,053,380 1,000 Los Angeles, Wastewater Refg Ser 2003 B (FSA) 5.00 06/01/22 1,041,190 1,000 Metropolitan Water District of Southern California, 2003 Ser B-2 (FGIC) 5.00 10/01/27 1,032,440 1,000 Oxnard Financing Authority, Redwood Trunk Sewer & Headworks 5.00 06/01/29 1,032,310 Ser 2004 A (FGIC) 1,000 Sacramento County, Sanitation District, Sacramento Regional 5.00 12/01/28 1,041,340 County (FGIC) 1,000 San Diego County Water Authority, Ser 2004 A COPs (FSA) 5.00 05/01/29 1,031,750 2,000 San Francisco Public Utilities Commission, Water Refg Ser A 2001 5.00 11/01/31 2,045,700 (FSA) 1,000 Yucaipa Valley Water District, Ser 2004 A COPs (MBIA) 5.25 09/01/24 1,060,400 ------ ----------- 11,500 11,945,400 ------ ----------- Other Revenue (2.0%) 1,000 Golden State Tobacco Securitization Corporation, Enhanced Asset 5.00 06/01/38 1,026,150 ------ Backed Ser 2005 A (FGIC) ----------- Refunded (16.0%) 2,000 Anaheim, Anaheim Memorial Hospital Assn COPs (Ambac) (ETM) 5.125 05/15/20 2,002,100 1,000 California Department of Water Resources, Power Supply 5.375 05/01/12+ 1,092,720 Ser 2002 A (Ambac) 2,000 California Infrastructure & Economic Development Bank, Bay Area 5.00 01/01/28+ 2,169,640 Toll Bridges Seismic Retrofit First Lien Ser 2003 A (FGIC) 2,000 Sacramento Financing Authority, Water & Capital Improvement 5.00 12/01/26+ 2,053,379 2001 Ser A (Ambac) 1,000 Puerto Rico Infrastructure Financing Authority, 2000 Ser A (ETM) 5.50 10/01/32 1,065,700 ------ ----------- 8,000 8,383,539 ------ ----------- 47,585 TOTAL CALIFORNIA TAX-EXEMPT MUNICIPAL BONDS (Cost $48,798,143) 49,587,203 ------ ----------- CALIFORNIA SHORT-TERM TAX-EXEMPT MUNICIPAL OBLIGATIONS (1.7%) 300 Newport Beach, Hoag Memorial Presbyterian Hospital 1992 3.53* 10/01/22 300,000 Ser (Demand 08/01/06) 600 Orange County Sanitation District, Ser 2000 B COPs 3.60* 08/01/30 600,000 (Demand 08/01/06) ----------- 900 TOTAL CALIFORNIA SHORT-TERM TAX-EXEMPT MUNICIPAL OBLIGATIONS (Cost $900,000) 900,000 ----------- $48,485 TOTAL INVESTMENTS (Cost $49,698,143) (a) (b) 96.7% 50,487,203 ======= OTHER ASSET IN EXCESS OF LIABILITIES 3.3 1,724,193 ----- ----------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS 100.0% $52,211,396 ====== =========== -------------------------- AMT Alternative Minimum Tax. COPs Certificates of Participation. ETM Escrowed to maturity. + Prerefunded to call date shown. ++ Current coupon rate for residual interest bond. This rate resets periodically as the auction rate on the related security changes. Position in an inverse floating rate municipal obligation has a value of $380,501 which represents 0.7% of net assets applicable to common shareholders. * Current coupon of variable rate demand obligation. # A portion of this security has been physically segregated in connection with open futures contracts in the amount of $26,000. (a) Securities have been designated as collateral in an amount equal to $6,231,625 in connection with open futures contracts. (b) The aggregate cost for federal income tax purposes is $48,737,446. The aggregate gross unrealized appreciation is $1,823,304 and the aggregate gross unrealized depreciation is $73,547, resulting in net unrealized appreciation of $1,749,757. BOND INSURANCE: Ambac Ambac Assurance Corporation. FGIC Financial Guaranty Insurance Company. FSA Financial Security Assurance Inc. MBIA Municipal Bond Investors Assurance Corporation. FUTURES CONTRACTS OPEN AT JULY 31, 2006: NUMBER OF DESCRIPTION/DELIVERY UNDERLYING FACE UNREALIZED CONTRACTS LONG/SHORT MONTH AND YEAR AMOUNT AT VALUE DEPRECIATION --------- ---------- -------------- --------------- ------------ 20 Short U.S. Treasury Notes 10 Year $(2,120,625) $(15,993) September 2006 40 Short U.S. Treasury Notes 5 Year (4,168,750) (12,922) --------- September 2006 Total Unrealized Depreciation ............ $(28,915) ========= ITEM 2. CONTROLS AND PROCEDURES. (a) The Trust's principal executive officer and principal financial officer have concluded that the Trust's disclosure controls and procedures are sufficient to ensure that information required to be disclosed by the Trust in this Form N-Q was recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, based upon such officers' evaluation of these controls and procedures as of a date within 90 days of the filing date of the report. (b) There were no changes in the Trust's internal control over financial reporting that occurred during the registrant's fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Trust's internal control over financial reporting. ITEM 3. EXHIBITS. (a) A separate certification for each principal executive officer and principal financial officer of the registrant are attached hereto. 2 SIGNATURES 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. Morgan Stanley Insured California Municipal Securities /s/ Ronald E. Robison Ronald E. Robison Principal Executive Officer September 21, 2006 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated. /s/ Ronald E. Robison Ronald E. Robison Principal Executive Officer September 21, 2006 /s/ Francis Smith Francis Smith Principal Financial Officer September 21, 2006 3