MORGAN STANLEY MORTGAGE SECURITIES TRUST
522 Fifth Avenue
New York, New York 10036
VIA EDGAR
January 30, 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 17, 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.
| Morgan Stanley Mortgage Securities Trust | Morgan Stanley Mortgage Securities Trust | |||||||||||||||||||||||||
| Morgan Stanley Mortgage Securities Trust | |||||||||||||||||||||||||
SUPPLEMENT DATED JANUARY 17, 2013 TO THE PROSPECTUS OF |
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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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Effective February 25, 2013, the following tables replace the "Example" tables with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Example:" |
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| If You SOLD Your Shares: | |||||||||||||||||||||||||
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| If You HELD Your Shares: | |||||||||||||||||||||||||
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| Label | Element | Value | ||||
|---|---|---|---|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Supplement [Text Block] | ck0000806564_SupplementTextBlock | SUPPLEMENT DATED JANUARY 17, 2013 TO THE PROSPECTUS OF |
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| Risk/Return [Heading] | rr_RiskReturnHeading | Morgan Stanley Mortgage Securities Trust | ||||
| Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | 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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| Fee Waiver or Reimbursement over Assets, Date of Termination | rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination | 2014-02-25 | ||||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | Effective February 25, 2013, the following tables replace the "Example" tables with respect to Class L shares only in the section of the Prospectus entitled "Fund Summary—Example:" |
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| Expense Example by, Year, Caption [Text] | rr_ExpenseExampleByYearCaption | If You SOLD Your Shares: | ||||
| Expense Example, No Redemption, By Year, Caption [Text] | rr_ExpenseExampleNoRedemptionByYearCaption | If You HELD Your Shares: | ||||
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| Risk/Return: | rr_RiskReturnAbstract | |||||
| 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% | [2] | |||
| Fee Waiver or Reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.27%) | [2] | |||
| Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement | rr_NetExpensesOverAssets | 1.25% | [2] | |||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | 127 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 397 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 686 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,511 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 127 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 397 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 686 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 1,511 | ||||
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| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Prospectus Date | rr_ProspectusDate | Feb. 29, 2012 |
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Document and Entity Information
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0 Months Ended |
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Oct. 31, 2012
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| Risk/Return: | |
| Document Type | Other |
| Document Period End Date | Oct. 31, 2012 |
| Registrant Name | MORGAN STANLEY MORTGAGE SECURITIES TRUST |
| Central Index Key | 0000806564 |
| Amendment Flag | false |
| Document Creation Date | Jan. 17, 2013 |
| Document Effective Date | Jan. 17, 2013 |
| Prospectus Date | Feb. 29, 2012 |
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Morgan Stanley Mortgage Securities Trust | Morgan Stanley Mortgage Securities Trust | C
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| Risk/Return: | |
| Trading Symbol | MTGCX |