UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number: 811-03165 Active Assets Government Securities Trust (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: June 30, 2007 Date of reporting period: December 31, 2006 Item 1 - Report to Shareholders Welcome, Shareholder: In this report, you'll learn about how your investment in Active Assets Government Securities Trust performed during the semiannual period. We will provide an overview of the market conditions, and discuss some of the factors that affected performance during the reporting period. In addition, this report includes the Fund's financial statements and a list of Fund investments. THIS MATERIAL MUST BE PRECEDED OR ACCOMPANIED BY A PROSPECTUS FOR THE FUND BEING OFFERED. MARKET FORECASTS PROVIDED IN THIS REPORT MAY NOT NECESSARILY COME TO PASS. THERE IS NO ASSURANCE THAT A MUTUAL FUND WILL ACHIEVE ITS INVESTMENT OBJECTIVE. AN INVESTMENT IN A MONEY MARKET FUND IS NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF AN INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND. PLEASE SEE THE PROSPECTUS FOR MORE COMPLETE INFORMATION ON INVESTMENT RISKS. FUND REPORT For the six months ended December 31, 2006 MARKET CONDITIONS During the six-month period under review, the U.S. economy showed signs of weakening. For November, the Institute for Supply Management (ISM) Manufacturing Index fell below 50 for the first time since April 2003, a level traditionally seen as an indicator of a contracting manufacturing sector. U.S. economic growth, as measured by gross domestic product (GDP), reflected the softening economy. GDP growth fell to 2.0 percent in the third quarter, down from the 2.6 percent and 5.6 percent growth rates experienced during the second and first quarters, respectively. Given signs of moderating economic growth, a cooling housing market and the lagged effect of monetary policy action already taken, the Federal Open Market Committee (the "Fed") left its federal funds target rate unchanged in the second half of 2006. The Fed continues to state "some inflation risks remain" in the economy. PERFORMANCE ANALYSIS As of December 31, 2006, Active Assets Government Securities Trust had net assets of approximately $485 million and an average portfolio maturity of 29 days. For the six-month period ended December 31, 2006, the Fund provided a total return of 2.33 percent. For the seven-day period ended December 31, 2006, the Fund provided an effective annualized yield of 4.68 percent and a current yield of 4.58 percent, while its 30-day moving average yield for December was 4.63 percent. Past performance is no guarantee of future results. Our strategy in managing the portfolio remained consistent with the Fund's long-term focus on preservation of capital and liquidity. Over the past six months, as the economic landscape has become more uncertain, we have further diversified the maturity structure of our portfolios by decreasing the amount of investments that mature near upcoming Fed meeting dates. In contrast, the main strategy that was followed during the first half of 2006 primarily consisted of concentrating our investments in fixed rate securities that matured near the Fed meeting dates in order to capitalize on higher expected money market interest rates. There is no guarantee that any sectors mentioned will continue to perform as discussed herein or that securities in such sectors will be held by the Fund in the future. 2 <Table> <Caption> PORTFOLIO COMPOSITION U.S. Government Agencies -- Discount Notes 58.6% U.S. Government Agencies -- Floating Rate Notes 28.1 Repurchase Agreements 13.3 </Table> <Table> <Caption> MATURITY SCHEDULE 1 - 30 Days 44.9% 31 - 60 Days 13.5 61 - 90 Days 14.2 91 - 120 Days 3.1 121 + Days 24.3 </Table> Data as of December 31, 2006. Subject to change daily. All percentages for portfolio composition and maturity schedule are as a percentage of total investments. These data are provided for informational purposes only and should not be deemed a recommendation to buy or sell the securities mentioned. Morgan Stanley is a full-service securities firm engaged in securities trading and brokerage activities, investment banking, research and analysis, financing and financial advisory services. INVESTMENT STRATEGY THE FUND WILL INVEST IN HIGH QUALITY, SHORT-TERM U.S. GOVERNMENT SECURITIES. THE FUND'S "INVESTMENT ADVISER," MORGAN STANLEY INVESTMENT ADVISORS INC., SEEKS TO MAINTAIN THE FUND'S SHARE PRICE AT $1.00. THE SHARE PRICE REMAINING STABLE AT $1.00 MEANS THAT THE FUND WOULD PRESERVE THE PRINCIPAL VALUE OF YOUR INVESTMENT. AN INVESTMENT IN THE FUND IS NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF YOUR INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND. FOR MORE INFORMATION ABOUT PORTFOLIO HOLDINGS EACH MORGAN STANLEY FUND PROVIDES A COMPLETE SCHEDULE OF PORTFOLIO HOLDINGS IN ITS SEMIANNUAL AND ANNUAL REPORTS WITHIN 60 DAYS OF THE END OF THE FUND'S SECOND AND FOURTH FISCAL QUARTERS. THE SEMIANNUAL REPORTS AND THE ANNUAL REPORTS ARE FILED ELECTRONICALLY WITH THE SECURITIES AND EXCHANGE COMMISSION (SEC) ON FORM N-CSRS AND FORM N-CSR, RESPECTIVELY. MORGAN STANLEY ALSO DELIVERS THE SEMIANNUAL AND ANNUAL REPORTS TO FUND SHAREHOLDERS AND MAKES THESE REPORTS AVAILABLE ON ITS PUBLIC WEB SITE, WWW.MORGANSTANLEY.COM. EACH MORGAN STANLEY FUND ALSO FILES A COMPLETE SCHEDULE OF PORTFOLIO HOLDINGS WITH THE SEC FOR THE FUND'S FIRST AND THIRD FISCAL QUARTERS ON FORM N-Q. MORGAN STANLEY DOES NOT DELIVER THE REPORTS FOR THE FIRST AND THIRD FISCAL QUARTERS TO SHAREHOLDERS, NOR ARE THE REPORTS POSTED TO THE MORGAN STANLEY PUBLIC WEB SITE. YOU MAY, HOWEVER, OBTAIN THE FORM N-Q FILINGS (AS WELL AS THE FORM N-CSR AND N-CSRS FILINGS) BY ACCESSING THE SEC'S WEB SITE, HTTP://WWW.SEC.GOV. YOU MAY ALSO REVIEW AND COPY THEM AT THE SEC'S PUBLIC REFERENCE ROOM IN WASHINGTON, DC. 3 INFORMATION ON THE OPERATION OF THE SEC'S PUBLIC REFERENCE ROOM MAY BE OBTAINED BY CALLING THE SEC AT (800) SEC-0330. YOU CAN ALSO REQUEST COPIES OF THESE MATERIALS, UPON PAYMENT OF A DUPLICATING FEE, BY ELECTRONIC REQUEST AT THE SEC'S E-MAIL ADDRESS (PUBLICINFO@SEC.GOV) OR BY WRITING THE PUBLIC REFERENCE SECTION OF THE SEC, WASHINGTON, DC 20549-0102. HOUSEHOLDING NOTICE TO REDUCE PRINTING AND MAILING COSTS, THE FUND ATTEMPTS TO ELIMINATE DUPLICATE MAILINGS TO THE SAME ADDRESS. THE FUND DELIVERS A SINGLE COPY OF CERTAIN SHAREHOLDER DOCUMENTS, INCLUDING SHAREHOLDER REPORTS, PROSPECTUSES AND PROXY MATERIALS, TO INVESTORS WITH THE SAME LAST NAME WHO RESIDE AT THE SAME ADDRESS. YOUR PARTICIPATION IN THIS PROGRAM WILL CONTINUE FOR AN UNLIMITED PERIOD OF TIME UNLESS YOU INSTRUCT US OTHERWISE. YOU CAN REQUEST MULTIPLE COPIES OF THESE DOCUMENTS BY CALLING (800) 350-6414, 8:00 A.M. TO 8:00 P.M., ET. ONCE OUR CUSTOMER SERVICE CENTER HAS RECEIVED YOUR INSTRUCTIONS, WE WILL BEGIN SENDING INDIVIDUAL COPIES FOR EACH ACCOUNT WITHIN 30 DAYS. 4 EXPENSE EXAMPLE As a shareholder of the Fund, you incur ongoing costs, including advisory fees; distribution and service (12b-1) fees; and other Fund expenses. This example is intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period 07/01/06 - 12/31/06. ACTUAL EXPENSES The first line of the table below provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES The second line of the table below provides information about hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing cost of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the table are meant to highlight your ongoing costs only. Therefore, the second line of the table is useful in comparing ongoing costs, and will not help you determine the relative total cost of owning different funds that have transactional costs, such as sales charges (loads), and redemption fees, or exchange fees. <Table> <Caption> BEGINNING ENDING EXPENSES PAID ACCOUNT VALUE ACCOUNT VALUE DURING PERIOD * ------------- ------------- --------------- 07/01/06 - 07/01/06 12/31/06 12/31/06 ------------- ------------- --------------- Actual (2.33% return)....................................... $1,000.00 $1,023.30 $3.28 Hypothetical (5% annual return before expenses)............. $1,000.00 $1,021.69 $3.28 </Table> - ------------------ * Expenses are equal to the Fund's annualized expense ratio of 0.65% multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period). 5 Active Assets Government Securities Trust PORTFOLIO OF INVESTMENTS - DECEMBER 31, 2006 (UNAUDITED) <Table> <Caption> ANNUALIZED PRINCIPAL YIELD AMOUNT IN ON DATE OF MATURITY THOUSANDS DESCRIPTION PURCHASE DATES VALUE - -------------------------------------------------------------------------------------------------------- U.S. Government Agencies - Discount Notes (58.6%) $205,000 Federal Home Loan Banks.................... 5.15 - 5.24% 01/03/07 - 03/16/07 $204,043,452 59,682 Federal National Mortgage Assoc............ 5.20 - 5.21 02/02/07 - 03/14/07 59,240,418 20,763 Freddie Mac................................ 5.19 02/27/07 20,588,435 ------------ Total U.S. Government Agencies - Discount Notes (Cost $283,872,305).......... 283,872,305 ------------ U.S. Government Agencies - Floating Rate Notes (28.1%) 101,100 Federal Farm Credit Banks.................. 5.20 - 5.28+ 01/03/07 - 10/03/07 101,100,325 35,000 Federal Home Loan Banks.................... 5.20 - 5.21+ 06/08/07 - 03/14/08 34,986,449 ------------ Total U.S. Government Agencies - Floating Rate Notes (Cost $136,086,774)..... 136,086,774 ------------ Repurchase Agreements (13.3%) 9,680 Barclays Capital Inc. (dated 12/29/06; proceeds $9,685,700) (a)................. 5.30 01/02/07 9,680,000 20,000 Goldman Sachs & Co. (dated 12/27/06; proceeds $20,020,572) (b)................ 5.29 01/03/07 20,000,000 35,000 Goldman Sachs & Co. (dated 12/26/06; proceeds $35,035,967) (c)................ 5.285 01/02/07 35,000,000 ------------ Total Repurchase Agreements (Cost $64,680,000)............................... 64,680,000 ------------ Total Investments (Cost $484,639,079) (d)...... 100.0% 484,639,079 Liabilities in Excess of Other Assets.......... 0.0 (32,718) ----- ------------ Net Assets..................................... 100.0% $484,606,361 ===== ============ </Table> - --------------------- <Table> + Rate shown is the rate in effect at December 31, 2006. (a) Collateralized by Federal National Mortgage Assoc. 5.00% due 05/01/33 valued at $9,873,600. (b) Collateralized by Federal National Mortgage Assoc. 4.75% due 01/18/11 valued at $20,400,484. (c) Collateralized by Freddie Mac and Federal National Mortgage Assoc. 4.50% - 4.63% due 07/15/13 - 10/15/13 valued at $35,700,432. (d) Cost is the same for federal income tax purposes. </Table> 6 See Notes to Financial Statements Active Assets Government Securities Trust FINANCIAL STATEMENTS Statement of Assets and Liabilities December 31, 2006 (unaudited) <Table> Assets: Investments in securities, at value (cost $484,639,079) (including repurchase agreements of $64,680,000).............................................. $484,639,079 Cash........................................................ 2,554 Interest receivable......................................... 325,141 Prepaid expenses and other assets........................... 34,173 ------------ Total Assets............................................ 485,000,947 ------------ Liabilities: Payable for: Investment advisory fee................................. 200,077 Distribution fee........................................ 45,409 Administration fee...................................... 22,705 Shares of beneficial interest........................... 14,556 Transfer agent fee...................................... 991 Accrued expenses and other payables......................... 110,848 ------------ Total Liabilities....................................... 394,586 ------------ Net Assets.............................................. $484,606,361 ============ Composition of Net Assets: Paid-in-capital............................................. $484,561,836 Accumulated undistributed net investment income............. 44,525 ------------ Net Assets.............................................. $484,606,361 ============ Net Asset Value Per Share 484,606,141 shares outstanding (unlimited shares authorized of $.01 par value).......................................... $1.00 ============ </Table> See Notes to Financial Statements 7 Active Assets Government Securities Trust FINANCIAL STATEMENTS continued Statement of Operations For the six months ended December 31, 2006 (unaudited) <Table> Net Investment Income: Interest Income............................................. $14,318,075 ----------- Expenses Investment advisory fee..................................... 1,205,088 Distribution fee............................................ 271,494 Administration fee.......................................... 135,747 Transfer agent fees and expenses............................ 33,979 Professional fees........................................... 33,164 Shareholder reports and notices............................. 32,932 Registration fees........................................... 18,910 Custodian fees.............................................. 17,082 Trustees' fees and expenses................................. 5,340 Other....................................................... 19,090 ----------- Total Expenses.......................................... 1,772,826 Less: expense offset........................................ (213) ----------- Net Expenses............................................ 1,772,613 ----------- Net Investment Income....................................... $12,545,462 =========== </Table> See Notes to Financial Statements 8 Active Assets Government Securities Trust FINANCIAL STATEMENTS continued Statements of Changes in Net Assets <Table> <Caption> FOR THE SIX FOR THE YEAR MONTHS ENDED ENDED DECEMBER 31, 2006 JUNE 30, 2006 ----------------- -------------- (unaudited) Increase (Decrease) in Net Assets: Operations: Net investment income....................................... $ 12,545,462 $ 28,353,598 Net realized gain........................................... -- 1,964 ------------ -------------- Net Increase............................................ 12,545,462 28,355,562 ------------ -------------- Dividends and Distributions to Shareholders from: Net investment income....................................... (12,545,294) (28,353,877) Net realized gain........................................... -- (1,964) ------------ -------------- Total Dividends and Distributions....................... (12,545,294) (28,355,841) ------------ -------------- Net decrease from transactions of beneficial interest....... (42,461,964) (523,115,513) ------------ -------------- Net Decrease............................................ (42,461,796) (523,115,792) Net Assets: Beginning of period......................................... 527,068,157 1,050,183,949 ------------ -------------- End of Period (Including accumulated undistributed net investment income of $44,525 and $44,357, respectively)....................... $484,606,361 $ 527,068,157 ============ ============== </Table> See Notes to Financial Statements 9 Active Assets Government Securities Trust NOTES TO FINANCIAL STATEMENTS - DECEMBER 31, 2006 (UNAUDITED) 1. Organization and Accounting Policies Active Assets Government Securities Trust (the "Fund") is registered under the Investment Company Act of 1940, as amended (the "Act"), as a diversified, open-end management investment company. The Fund's investment objectives are high current income, preservation of capital and liquidity. The Fund was organized as a Massachusetts business trust on March 30, 1981 and commenced operations on July 7, 1981. The following is a summary of significant accounting policies: A. Valuation of Investments -- Portfolio securities are valued at amortized cost, which approximates market value, in accordance with Rule 2a-7 under the Act. B. Accounting for Investments -- Security transactions are accounted for on the trade date (date the order to buy or sell is executed). Realized gains and losses on security transactions are determined by the identified cost method. Discounts are accreted and premiums are amortized over the life of the respective securities. Interest income is accrued daily. C. Repurchase Agreements -- The Fund may invest directly with institutions in repurchase agreements. The Fund's custodian receives the collateral, which is marked-to-market daily to determine that the value of the collateral does not decrease below the repurchase price plus accrued interest. D. Federal Income Tax Policy -- It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substantially all of its taxable income to its shareholders. Accordingly, no federal income tax provision is required. E. Dividends and Distributions to Shareholders -- The Fund records dividends and distributions to shareholders as the close of each business day. F. Use of Estimates -- The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates. 2. Investment Advisory/Administration Agreements Pursuant to an Investment Advisory Agreement with Morgan Stanley Investment Advisors Inc. (the "Investment Adviser"), the Fund pays the Investment Adviser an advisory fee, accrued daily and payable monthly, by applying the following annual rates to the net assets of the Fund determined as of the close of each business day: 0.45% to the portion of the daily net assets not exceeding $500 million; 0.375% to the portion of the daily net assets exceeding $500 million but not 10 Active Assets Government Securities Trust NOTES TO FINANCIAL STATEMENTS - DECEMBER 31, 2006 (UNAUDITED) continued exceeding $750 million; 0.325% to the portion of the daily net assets exceeding $750 million but not exceeding $1 billion; 0.30% to the portion of the daily net assets exceeding $1 billion but not exceeding $1.5 billion; 0.275% to the portion of the daily net assets exceeding $1.5 billion but not exceeding $2 billion; 0.25% to the portion of the daily net assets exceeding $2 billion but not exceeding $2.5 billion; 0.225% to the portion of the daily net assets exceeding $2.5 billion but not exceeding $3 billion; and 0.20% to the portion of the daily net assets exceeding $3 billion. Pursuant to an Administration Agreement with Morgan Stanley Services Company Inc. (the "Administrator"), an affiliate of the Investment Adviser, the Fund pays an administration fee, accrued daily and payable monthly, by applying the annual rate of 0.05% to the Fund's daily net assets. 3. Plan of Distribution Morgan Stanley Distributors Inc. (the "Distributor"), an affiliate of the Investment Adviser and Administrator, is the distributor of the Fund's shares and in accordance with a Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under the Act, finances certain expenses in connection with the promotion of sales of Fund shares. Reimbursements for these expenses are made in monthly payments by the Fund to the Distributor, which will in no event exceed an amount equal to a payment at the annual rate of 0.15% of the Fund's average daily net assets during the month. Expenses incurred by the Distributor pursuant to the Plan in any fiscal year will not be reimbursed by the Fund through payments accrued in any subsequent fiscal year. For the six months ended December 31, 2006, the distribution fee was accrued at the annual rate of 0.10%. 4. Security Transactions and Transactions with Affiliates The cost of purchases and proceeds from sales/maturities of portfolio securities for the six months ended December 31, 2006, aggregated $14,547,772,323 and $14,597,776,053, respectively. Morgan Stanley Trust, an affiliate of the Investment Adviser, Administrator and Distributor, is the Fund's transfer agent. The Fund has an unfunded noncontributory defined benefit pension plan covering certain independent Trustees of the Fund who will have served as independent Trustees for at least five years at the time of retirement. Benefits under this plan are based on factors which include years of service and compensation. The Trustees voted to close the plan to new participants and eliminate the future benefits growth due to increases to compensation after July 31, 2003. Aggregate pension costs for the six months ended December 31, 2006, included in Trustees' fees and expenses in the Statement of Operations amounted to $1,443. At December 31, 2006, the Fund had an accrued 11 Active Assets Government Securities Trust NOTES TO FINANCIAL STATEMENTS - DECEMBER 31, 2006 (UNAUDITED) continued pension liability of $62,566 which is included in accrued expenses in the Statement of Assets and Liabilities. The Fund has an unfunded Deferred Compensation Plan (the "Compensation Plan") which allows each independent Trustee to defer payment of all, or a portion, of the fees he or she receives for serving on the Board of Trustees. Each eligible Trustee generally may elect to have the deferred amounts credited with a return equal to the total return on one or more of the Morgan Stanley funds that are offered as investment options under the Compensation Plan. Appreciation/depreciation and distributions received from these investments are recorded with an offsetting increase/decrease in the deferred compensation obligation and do not affect the net asset value of the Fund. 5. Shares of Beneficial Interest Transactions in shares of beneficial interest, at $1.00 per share, were as follows: <Table> <Caption> FOR THE SIX FOR THE YEAR MONTHS ENDED ENDED DECEMBER 31, 2006 JUNE 30, 2006 ----------------- -------------- (unaudited) Shares sold................................................. 2,221,902,344 4,679,369,252 Shares issued in reinvestment of dividends and distributions............................................. 12,531,682 28,293,053 -------------- -------------- 2,234,434,026 4,707,662,305 Shares redeemed............................................. (2,276,895,990) (5,230,777,818) -------------- -------------- Net decrease in shares outstanding.......................... (42,461,964) (523,115,513) ============== ============== </Table> 6. Expense Offset The expense offset represents a reduction of the fees and expenses for interest earned on cash balances maintained by the Fund with the transfer agent. 7. New Accounting Pronouncements In July 2006, the Financial Accounting Standards Board (FASB) issued Interpretation 48, Accounting for Uncertainty in Income Taxes -- an interpretation of FASB Statement 109 (FIN 48). FIN 48 clarifies the accounting for income taxes by prescribing the minimum recognition threshold a tax position must meet before being recognized in the financial statements. FIN 48 is effective for fiscal years beginning after December 15, 2006 and is to be applied to all open tax years as of the effective date. Recent SEC guidance allows implementing FIN 48 in the fund NAV calculations on the fund's last NAV calculation in the first required financial statement period. As a result, the Fund will 12 Active Assets Government Securities Trust NOTES TO FINANCIAL STATEMENTS - DECEMBER 31, 2006 (UNAUDITED) continued incorporate FIN 48 in its semi annual report on June 30, 2007. The impact to the Fund's financial statements, if any, is currently being assessed. In addition, in September 2006, Statement of Financial Accounting Standards No. 157, Fair Value Measurements (SFAS 157), was issued and is effective for fiscal years beginning after November 15, 2007. SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the impact the adoption of SFAS 157 will have on the Fund's financial statement disclosures. 13 Active Assets Government Securities Trust FINANCIAL HIGHLIGHTS Selected ratios and per share data for a share of beneficial interest outstanding throughout each period: <Table> <Caption> FOR THE SIX FOR THE YEAR ENDED JUNE 30, MONTHS ENDED ----------------------------------------------- DECEMBER 31, 2006 2006 2005 2004 2003 2002 ----------------- ------- ------- ------- ------- ------- (unaudited) Selected Per Share Data: Net asset value, beginning of period............ $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ------- ------- ------- ------- ------- ------- Net income from investment operations........... 0.023 0.035 0.016 0.005 0.009 0.020 Less dividends from net investment income....... (0.023) (0.035)+ (0.016)+ (0.005) (0.009)+ (0.020)+ ------- ------- ------- ------- ------- ------- Net asset value, end of period.................. $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 $ 1.00 ======= ======= ======= ======= ======= ======= Total Return.................................... 2.33 %(1) 3.60% 1.61% 0.50% 0.95% 2.01% Ratios to Average Net Assets: Total expenses (before expense offset).......... 0.65 %(2) 0.61% 0.58% 0.56% 0.55% 0.53% Net investment income........................... 4.62 %(2) 3.42% 1.60% 0.49% 0.96% 1.96% Supplemental Data: Net assets, end of period, in millions.......... $485 $527 $1,050 $1,083 $1,229 $1,427 </Table> - --------------------- <Table> + Includes capital gain distribution of less than $0.001. (1) Not annualized. (2) Annualized. </Table> See Notes to Financial Statements 14 Active Assets Government Securities Trust RESULTS OF SPECIAL SHAREHOLDER MEETING (UNAUDITED) On August 1, 2006, a Special Meeting of Shareholders of the Fund was scheduled in order to vote on the following proposals: (i) to elect Trustees; (ii) to eliminate certain fundamental investment restrictions; (iii) to modify certain fundamental investment restrictions; and (iv) to reclassify certain fundamental policies as non-fundamental policies. The proposals failed to achieve the quorum necessary in order to hold the meeting, and, therefore, the meeting was adjourned several times, most recently to February 16, 2007, to permit further solicitation of proxies. 15 TRUSTEES Michael Bozic James F. Higgins Dr. Manuel H. Johnson Joseph J. Kearns Michael E. Nugent Fergus Reid OFFICERS Michael E. Nugent Chairman of the Board Ronald E. Robison President and Principal Executive Officer J. David Germany Vice President Dennis F. Shea Vice President Barry Fink Vice President Amy R. Doberman Vice President Carsten Otto Chief Compliance Officer Stefanie V. Chang Yu Vice President Francis J. Smith Treasurer and Chief Financial Officer Mary E. Mullin Secretary TRANSFER AGENT Morgan Stanley Trust Harborside Financial Center, Plaza Two Jersey City, New Jersey 07311 INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Deloitte & Touche LLP Two World Financial Center New York, New York 10281 INVESTMENT ADVISER Morgan Stanley Investment Advisors Inc. 1221 Avenue of the Americas New York, New York 10020 The financial statements included herein have been taken from the records of the Fund without examination by the independent auditors and accordingly they do not express an opinion thereon. This report is submitted for the general information of the shareholders of the Fund. For more detailed information about the Fund, its fees and expenses and other pertinent information, please read its Prospectus. The Fund's Statement of Additional Information contains additional information about the Fund, including its trustees. It is available, without charge, by calling (800) 869-NEWS. This report is not authorized for distribution to prospective investors in the Fund unless preceded or accompanied by an effective Prospectus. Read the Prospectus carefully before investing. Morgan Stanley Distributors Inc., member NASD (c) 2006 Morgan Stanley [MORGAN STANLEY LOGO] MORGAN STANLEY FUNDS Active Assets Government Securities Trust Semiannual Report December 31, 2006 [MORGAN STANLEY LOGO] AAGSAR-RA07-00155P-Y12/06 Item 2. Code of Ethics. Not applicable for semiannual reports. Item 3. Audit Committee Financial Expert. Not applicable for semiannual reports. Item 4. Principal Accountant Fees and Services Not applicable for semiannual reports. Item 5. Audit Committee of Listed Registrants. Not applicable for semiannual reports. Item 6. Refer to Item 1. Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies. Not applicable for semiannual reports. Item 8. Portfolio Managers of Closed-End Management Investment Companies Applicable only to reports filed by closed-end funds. Item 9. Closed-End Fund Repurchases Applicable to reports filed by closed-end funds. Item 10. Submission of Matters to a Vote of Security Holders Not applicable. Item 11. Controls and Procedures (a) The Fund's principal executive officer and principal financial officer have concluded that the Fund's disclosure controls and procedures are sufficient to ensure that information required to be disclosed by the Fund in this Form N-CSR 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 registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12. Exhibits (a) Code of Ethics - Not applicable for semiannual reports. (b) A separate certification for each principal executive officer and principal financial officer of the registrant are attached hereto as part of EX-99.CERT. 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. Active Assets Government Securities Trust /s/ Ronald E. Robison - ------------------------------------ Ronald E. Robison Principal Executive Officer February 9, 2007 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 February 9, 2007 /s/ Francis Smith - ------------------------------------ Francis Smith Principal Financial Officer February 9, 2007 3