485BPOS

As filed with the Securities and Exchange Commission on January 11, 2013

Registration Nos. 2-80751

811-3618

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

¨

Post-Effective Amendment No. 65

þ

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

¨

Amendment No. 67

þ

(Check appropriate box or boxes)

Metropolitan Series Fund

(Exact Name of Registrant as Specified in Charter)

501 Boylston Street

Boston, Massachusetts    02116

(Address of Principal Executive Office) (Zip Code)

Registrant’s Telephone Number, Including Area Code: 617-578-4036    

MICHAEL LAWLOR, ESQ.

MetLife Advisers, LLC

501 Boylston Street

Boston, MA 02116

(Name and Address of Agent for Service)

Copy to:

DAVID C. MAHAFFEY, ESQ.

Sullivan & Worcester LLP

1666 K St., N.W.

Washington, D.C. 20006

It is proposed that the filing will become effective (check appropriate box)

x  immediately upon filing pursuant to paragraph (b) of Rule 485.

¨  on (date) pursuant to paragraph (b) of Rule 485.

¨  60 days after filing pursuant to paragraph (a)(1) of Rule 485.

¨  on (date) pursuant to paragraph (a)(1) of Rule 485.

¨  75 days after filing pursuant to paragraph (a)(2) of Rule 485.

¨  on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, as amended, the Registrant, METROPOLITAN SERIES FUND, certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment No. 65 to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and the Commonwealth of Massachusetts, on the 11th day of January, 2013.

METROPOLITAN SERIES FUND
(Registrant)
By:	/s/    ELIZABETH M. FORGET
	Elizabeth M. Forget
	President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 65 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Date
/s/    ELIZABETH M. FORGET Elizabeth M. Forget Chairman of the Board, Chief Executive Officer, President and Trustee	January 11, 2013
* Linda Strumpf Trustee
* Nancy Hawthorne Trustee
* Dawn M. Vroegop Trustee
* Keith M. Schappert Trustee
* Stephen M. Alderman Trustee
* Robert J. Boulware Trustee
* Daniel A. Doyle Trustee
* Susan C. Gause Trustee
/s/    PETER H. DUFFY         Peter H. Duffy Treasurer (Principal Financial and Accounting Officer)	January 11, 2013
*BY:      /S/     DAVID C. MAHAFFEY                     David C. Mahaffey         Attorney-in-Fact	January 11, 2013

EXHIBIT INDEX

Exhibit No.	Title of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

MFS^® VALUE PORTFOLIO

A SERIES OF METROPOLITAN SERIES FUND

SUPPLEMENT DATED DECEMBER 21, 2012

TO THE

SUMMARY PROSPECTUS AND PROSPECTUS DATED APRIL 30, 2012

IMPORTANT NOTICE TO INVESTORS

As of December 21, 2012, MFS^® Value Portfolio (the "Portfolio") began offering Class D shares, in addition to the Class A, Class B and Class E shares already offered. Accordingly, the Portfolio's summary prospectus and prospectus are hereby amended to add the following disclosure.

MFS^® Value Portfolio

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row listing the Portfolio's share classes with the following:

Class A, Class B, Class D and Class E Shares

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row with the date of the prospectus with the following:

April 30, 2012, as supplemented December 21, 2012

In the section "Fees and Expenses of the Portfolio" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D shares by replacing the "Annual Portfolio Operating Expenses" table, and the footnotes following the tables, with the following:

Annual Portfolio Operating Expenses (expenses that you

pay each year as a percentage of the value of your investment)

	Class A			Class B			Class D			Class E
Management Fees		0.70	%		0.70	%		0.70	%		0.70	%
Distribution and Service (12b-1) Fees		None			0.25	%		0.10	%		0.15	%
Other Expenses		0.03	%		0.03	%		0.03	%(2)		0.03	%
Total Annual Portfolio Operating Expenses		0.73	%		0.98	%		0.83	%		0.88	%
Fee Waiver(1)		(0.13	%)		(0.13	%)		(0.13	%)		(0.13	%)
Net Operating Expenses(1)		0.60	%		0.85	%		0.70	%		0.75	%

(1) MetLife Advisers, LLC has contractually agreed, for the period April 30, 2012 through April 30, 2013, to reduce the Management Fee for each Class of the Portfolio to 0.65% for the first $200 million of the Portfolio's average daily net assets, 0.625% for the next $1.3 billion and 0.50% for amounts over $1.5 billion. This arrangement may be modified or discontinued prior to April 30, 2013, only with the approval of the Board of Trustees of the Portfolio.

(2) Estimated.

In the section "Example" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D Shares by replacing the table with the following:

	1 Year		3 Years		5 Years		10 Years
Class A	$	61	$	220	$	393	$	894
Class B	$	87	$	299	$	529	$	1,190
Class D	$	72	$	252	$	448	$	1,013
Class E	$	77	$	268	$	475	$	1,072

Add the following sentence after the second paragraph under "Past Performance" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus:

Class D shares have not had a full calendar year of investment operations. Therefore, performance information for Class D shares is not included. 

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

METROPOLITAN SERIES FUND

Prospectus Date

rr_ProspectusDate

Apr. 30, 2012

Supplement [Text Block]

msf3_SupplementTextBlock

MFS^® VALUE PORTFOLIO

A SERIES OF METROPOLITAN SERIES FUND

SUPPLEMENT DATED DECEMBER 21, 2012

TO THE

SUMMARY PROSPECTUS AND PROSPECTUS DATED APRIL 30, 2012

IMPORTANT NOTICE TO INVESTORS

As of December 21, 2012, MFS^® Value Portfolio (the "Portfolio") began offering Class D shares, in addition to the Class A, Class B and Class E shares already offered. Accordingly, the Portfolio's summary prospectus and prospectus are hereby amended to add the following disclosure.

MFS^® Value Portfolio

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row listing the Portfolio's share classes with the following:

Class A, Class B, Class D and Class E Shares

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row with the date of the prospectus with the following:

April 30, 2012, as supplemented December 21, 2012

In the section "Fees and Expenses of the Portfolio" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D shares by replacing the "Annual Portfolio Operating Expenses" table, and the footnotes following the tables, with the following:

Annual Portfolio Operating Expenses (expenses that you

pay each year as a percentage of the value of your investment)

	Class A			Class B			Class D			Class E
Management Fees		0.70	%		0.70	%		0.70	%		0.70	%
Distribution and Service (12b-1) Fees		None			0.25	%		0.10	%		0.15	%
Other Expenses		0.03	%		0.03	%		0.03	%(2)		0.03	%
Total Annual Portfolio Operating Expenses		0.73	%		0.98	%		0.83	%		0.88	%
Fee Waiver(1)		(0.13	%)		(0.13	%)		(0.13	%)		(0.13	%)
Net Operating Expenses(1)		0.60	%		0.85	%		0.70	%		0.75	%

(1) MetLife Advisers, LLC has contractually agreed, for the period April 30, 2012 through April 30, 2013, to reduce the Management Fee for each Class of the Portfolio to 0.65% for the first $200 million of the Portfolio's average daily net assets, 0.625% for the next $1.3 billion and 0.50% for amounts over $1.5 billion. This arrangement may be modified or discontinued prior to April 30, 2013, only with the approval of the Board of Trustees of the Portfolio.

(2) Estimated.

In the section "Example" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D Shares by replacing the table with the following:

	1 Year		3 Years		5 Years		10 Years
Class A	$	61	$	220	$	393	$	894
Class B	$	87	$	299	$	529	$	1,190
Class D	$	72	$	252	$	448	$	1,013
Class E	$	77	$	268	$	475	$	1,072

Add the following sentence after the second paragraph under "Past Performance" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus:

Class D shares have not had a full calendar year of investment operations. Therefore, performance information for Class D shares is not included. 

MFS Value Portfolio

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

msf3_SupplementTextBlock

MFS^® VALUE PORTFOLIO

A SERIES OF METROPOLITAN SERIES FUND

SUPPLEMENT DATED DECEMBER 21, 2012

TO THE

SUMMARY PROSPECTUS AND PROSPECTUS DATED APRIL 30, 2012

IMPORTANT NOTICE TO INVESTORS

As of December 21, 2012, MFS^® Value Portfolio (the "Portfolio") began offering Class D shares, in addition to the Class A, Class B and Class E shares already offered. Accordingly, the Portfolio's summary prospectus and prospectus are hereby amended to add the following disclosure.

MFS^® Value Portfolio

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row listing the Portfolio's share classes with the following:

Class A, Class B, Class D and Class E Shares

The cover page of the Portfolio's summary prospectus and prospectus are hereby revised to replace the row with the date of the prospectus with the following:

April 30, 2012, as supplemented December 21, 2012

In the section "Fees and Expenses of the Portfolio" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D shares by replacing the "Annual Portfolio Operating Expenses" table, and the footnotes following the tables, with the following:

Annual Portfolio Operating Expenses (expenses that you

pay each year as a percentage of the value of your investment)

	Class A			Class B			Class D			Class E
Management Fees		0.70	%		0.70	%		0.70	%		0.70	%
Distribution and Service (12b-1) Fees		None			0.25	%		0.10	%		0.15	%
Other Expenses		0.03	%		0.03	%		0.03	%(2)		0.03	%
Total Annual Portfolio Operating Expenses		0.73	%		0.98	%		0.83	%		0.88	%
Fee Waiver(1)		(0.13	%)		(0.13	%)		(0.13	%)		(0.13	%)
Net Operating Expenses(1)		0.60	%		0.85	%		0.70	%		0.75	%

(1) MetLife Advisers, LLC has contractually agreed, for the period April 30, 2012 through April 30, 2013, to reduce the Management Fee for each Class of the Portfolio to 0.65% for the first $200 million of the Portfolio's average daily net assets, 0.625% for the next $1.3 billion and 0.50% for amounts over $1.5 billion. This arrangement may be modified or discontinued prior to April 30, 2013, only with the approval of the Board of Trustees of the Portfolio.

(2) Estimated.

In the section "Example" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus, add Class D Shares by replacing the table with the following:

	1 Year		3 Years		5 Years		10 Years
Class A	$	61	$	220	$	393	$	894
Class B	$	87	$	299	$	529	$	1,190
Class D	$	72	$	252	$	448	$	1,013
Class E	$	77	$	268	$	475	$	1,072

Add the following sentence after the second paragraph under "Past Performance" in the Portfolio's summary prospectus and in the Portfolio Summary section of the Portfolio's prospectus:

Class D shares have not had a full calendar year of investment operations. Therefore, performance information for Class D shares is not included. 

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Portfolio Operating Expenses (expenses that you
pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2013

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Class D shares have not had a full calendar year of investment operations. Therefore, performance information for Class D shares is not included.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

Class D shares have not had a full calendar year of investment operations. Therefore, performance information for Class D shares is not included.

MFS Value Portfolio | Class A

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.73%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[1]

Net Operating Expenses

rr_NetExpensesOverAssets

0.60%

^[1]

1 Year

rr_ExpenseExampleNoRedemptionYear01

61

3 Years

rr_ExpenseExampleNoRedemptionYear03

220

5 Years

rr_ExpenseExampleNoRedemptionYear05

393

10 Years

rr_ExpenseExampleNoRedemptionYear10

894

MFS Value Portfolio | Class B

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.98%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[1]

Net Operating Expenses

rr_NetExpensesOverAssets

0.85%

^[1]

1 Year

rr_ExpenseExampleNoRedemptionYear01

87

3 Years

rr_ExpenseExampleNoRedemptionYear03

299

5 Years

rr_ExpenseExampleNoRedemptionYear05

529

10 Years

rr_ExpenseExampleNoRedemptionYear10

1,190

MFS Value Portfolio | Class D

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.10%

Other Expenses

rr_OtherExpensesOverAssets

0.03%

^[2]

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.83%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[1]

Net Operating Expenses

rr_NetExpensesOverAssets

0.70%

^[1]

1 Year

rr_ExpenseExampleNoRedemptionYear01

72

3 Years

rr_ExpenseExampleNoRedemptionYear03

252

5 Years

rr_ExpenseExampleNoRedemptionYear05

448

10 Years

rr_ExpenseExampleNoRedemptionYear10

1,013

MFS Value Portfolio | Class E

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.15%

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Total Annual Portfolio Operating Expenses

rr_ExpensesOverAssets

0.88%

Fee Waiver

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[1]

Net Operating Expenses

rr_NetExpensesOverAssets

0.75%

^[1]

1 Year

rr_ExpenseExampleNoRedemptionYear01

77

3 Years

rr_ExpenseExampleNoRedemptionYear03

268

5 Years

rr_ExpenseExampleNoRedemptionYear05

475

10 Years

rr_ExpenseExampleNoRedemptionYear10

1,072

[1] MetLife Advisers, LLC has contractually agreed, for the period April 30, 2012 through April 30, 2013, to reduce the Management Fee for each Class of the Portfolio to 0.65% for the first $200 million of the Portfolio’s average daily net assets, 0.625% for the next $1.3 billion and 0.50% for amounts over $1.5 billion. This arrangement may be modified or discontinued prior to April 30, 2013, only with the approval of the Board of Trustees of the Portfolio.

[2] Estimated.

XML

Document and Entity Information	12 Months Ended
	Apr. 30, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Dec. 31, 2011
Registrant Name	METROPOLITAN SERIES FUND
Central Index Key	0000710826
Amendment Flag	false
Document Creation Date	Dec. 21, 2012
Document Effective Date	Dec. 21, 2012
Prospectus Date	Apr. 30, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	METROPOLITAN SERIES FUND
Prospectus Date	rr_ProspectusDate	Apr. 30, 2012
Document Creation Date	dei_DocumentCreationDate	Dec. 21, 2012