As filed with the Securities and Exchange Commission on March 21, 2014
Registration Nos.: 33-10363
811-4917
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-1A
REGISTRATION STATEMENT
UNDER THE SECURITIES ACT OF 1933
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Pre-Effective Amendment No.
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Post-Effective Amendment No. 37
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and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
ACT OF 1940
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Amendment No. 38
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Morgan Stanley Mortgage Securities Trust
(A Massachusetts business trust)
(Exact Name of Registrant as Specified in Charter)
522 Fifth Avenue
New York, New York 10036
(Address of Principal Executive Office)
Registrant's Telephone Number, Including Area Code: (212) 296-6969
Joseph C. Benedetti, Esq.
522 Fifth Avenue
New York, New York 10036
(Name and Address of Agent for Service)
Copy to:
Carl Frischling, Esq.
Kramer Levin Naftalis & Frankel LLP
1177 Avenue of the Americas
New York, New York 10036
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Stuart M. Strauss, Esq.
Dechert LLP
1095 Avenue of the Americas
New York, New York 10036
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Approximate Date of Proposed Public Offering:
As soon as practicable after this Post-Effective Amendment becomes effective.
It is proposed that this filing will become effective (check appropriate box)
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Immediately upon filing pursuant to paragraph (b)
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On (date) pursuant to paragraph (b)
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60 days after filing pursuant to paragraph (a)(1)
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On (date) pursuant to paragraph (a)(1)
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75 days after filing pursuant to paragraph (a)(2)
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On (date) pursuant to paragraph (a)(2) of Rule 485.
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Amending the Prospectus and Updating Financial Statements
If appropriate, check the following box:
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This post-effective amendment designates a new effective
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date for a previously filed post-effective amendment.
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