MORGAN STANLEY MORTGAGE SECURITIES TRUST
522 Fifth Avenue
New York, New York 10036
VIA EDGAR
January 22, 2013
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Re: Morgan Stanley Mortgage Securities Trust
File Nos. 33-10363; 811-04917
Ladies and Gentlemen:
On behalf of Morgan Stanley Mortgage Securities Trust (“Registrant”), we hereby submit for filing pursuant to Rule 497(e) under the Securities Act of 1933, as amended, exhibits containing interactive data format risk/return summary information for the Registrant. These exhibits contain the risk/return summary information in the prospectus for the Registrant dated February 29, 2012. The purpose of this filing is to submit the XBRL information from the 497(e) filing dated January 14, 2013 for the Registrant.
If you have any questions, please feel free to contact me at 212.296.6983 (tel.) or 646.452.4799 (fax).
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Very truly yours, |
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/s/ Tara Farrelly |
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Tara Farrelly |
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Assistant Secretary |
Enclosures
cc: Stefanie V. Chang Yu, Esq.
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| Morgan Stanley Mortgage Securities Trust (Prospectus Summary): | Morgan Stanley Mortgage Securities Trust | |||||||||||||||||
| MORGAN STANLEY MORTGAGE SECURITIES TRUST | |||||||||||||||||
Morgan Stanley January 14, 2013 Supplement SUPPLEMENT DATED JANUARY 14, 2013 TO THE PROSPECTUS OF
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| The following table replaces the "Shareholder Fees" table with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Shareholder Fees," effective February 25, 2013: | |||||||||||||||||
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| Effective February 25, 2013, the 12b-1 fee for the Class L shares of the Fund will be reduced from 0.85% to 0.50%. Accordingly, the following table replaces the "Annual Fund Operating Expenses" table with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Annual Fund Operating Expenses," effective February 25, 2013: | |||||||||||||||||
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| The following tables replace the "Example" tables with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Example:" | |||||||||||||||||
| If You SOLD Your Shares: | |||||||||||||||||
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| If You HELD Your Shares: | |||||||||||||||||
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Additionally, all references elsewhere in the Prospectus to a 12b-1 fee of 0.85% for Class L shares will be replaced with 0.50%.
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PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.
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| Label | Element | Value | ||
|---|---|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |||
| Prospectus Date | rr_ProspectusDate | Feb. 29, 2012 | ||
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Morgan Stanley Mortgage Securities Trust (Prospectus Summary): | Morgan Stanley Mortgage Securities Trust
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| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk/Return, Heading | rr_RiskReturnHeading | MORGAN STANLEY MORTGAGE SECURITIES TRUST | ||
| Supplement Text | ck0000806564_SupplementTextBlock | Morgan Stanley January 14, 2013 Supplement SUPPLEMENT DATED JANUARY 14, 2013 TO THE PROSPECTUS OF
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| Shareholder Fees, Caption | rr_ShareholderFeesCaption | The following table replaces the "Shareholder Fees" table with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Shareholder Fees," effective February 25, 2013: | ||
| Operating Expenses, Caption | rr_OperatingExpensesCaption | Effective February 25, 2013, the 12b-1 fee for the Class L shares of the Fund will be reduced from 0.85% to 0.50%. Accordingly, the following table replaces the "Annual Fund Operating Expenses" table with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Annual Fund Operating Expenses," effective February 25, 2013: | ||
| Expense Example, Heading | rr_ExpenseExampleHeading | The following tables replace the "Example" tables with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Example:" | ||
| Expense Example, By Year, Caption | rr_ExpenseExampleByYearCaption | If You SOLD Your Shares: | ||
| Expense Example, No Redemption, By Year, Caption | rr_ExpenseExampleNoRedemptionByYearCaption | If You HELD Your Shares: | ||
| Expense Example, Closing | rr_ExpenseExampleClosingTextBlock | Additionally, all references elsewhere in the Prospectus to a 12b-1 fee of 0.85% for Class L shares will be replaced with 0.50%.
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| Supplement Closing | ck0000806564_SupplementClosingTextBlock | PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.
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Morgan Stanley Mortgage Securities Trust | Class L
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| Risk/Return: | rr_RiskReturnAbstract | |||
| Trading Symbol | dei_TradingSymbol | MTGCX | ||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||
| Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or net asset value at redemption) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | ||
| Advisory Fee | rr_ManagementFeesOverAssets | 0.47% | ||
| Distribution and Service (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | 0.50% | [1] | |
| Other Expenses | rr_OtherExpensesOverAssets | 0.55% | ||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 1.52% | ||
| Expense Example, With Redemption, 1 Year | rr_ExpenseExampleYear01 | 155 | ||
| Expense Example, With Redemption, 3 Years | rr_ExpenseExampleYear03 | 480 | ||
| Expense Example, With Redemption, 5 Years | rr_ExpenseExampleYear05 | 829 | ||
| Expense Example, With Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,813 | ||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 155 | ||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 480 | ||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 829 | ||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 1,813 | ||
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| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Document Type | dei_DocumentType | Other |
| Document Period End Date | dei_DocumentPeriodEndDate | Jan. 14, 2013 |
| Registrant Name | dei_EntityRegistrantName | MORGAN STANLEY MORTGAGE SECURITIES TRUST |
| Central Index Key | dei_EntityCentralIndexKey | 0000806564 |
| Amendment Flag | dei_AmendmentFlag | false |
| Document Creation Date | dei_DocumentCreationDate | Jan. 14, 2013 |
| Document Effective Date | dei_DocumentEffectiveDate | Jan. 14, 2013 |
| Prospectus Date | rr_ProspectusDate | Feb. 29, 2012 |