485BPOS

As filed with the Securities and Exchange Commission on October 16, 2012

1933 Act Registration No. 333-84639

1940 Act Registration No. 811-09521

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		x
	Pre-Effective Amendment No.	o
	Post-Effective Amendment No. 94	x
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		x
Amendment No. 97		x

MANAGERS AMG FUNDS

(Exact name of registrant as specified in charter)

800 Connecticut Avenue

Norwalk, Connecticut 06854

(Address of principal executive offices)

Registrant’s telephone number, including area code: (800) 835-3879

Gregory C. Davis

Rajib Chanda

Ropes & Gray LLP

Three Embarcadero Center

San Francisco, CA 94111-4006

(Name and address of agent for service)

It is proposed that this filing will become effective:

x       immediately upon filing pursuant to paragraph (b)

o       on (date) pursuant to paragraph (b)

o       60 days after filing pursuant to paragraph (a)(1)

o       on (date) pursuant to paragraph (a)(1)

o       75 days after filing pursuant to paragraph (a)(2)

o       On (date) pursuant to (a)(2) of rule 485

If appropriate, check the following box:

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

The Amendment relates solely to Essex Small/Micro Cap Growth Fund, a series of Managers AMG Funds.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, each as amended, Managers AMG Funds 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 amendment to the registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Norwalk, and State of Connecticut, on the 16th day of October, 2012.

MANAGERS AMG FUNDS
By:	/s/ Donald S. Rumery
	Donald S. Rumery
	Treasurer, Chief Financial Officer, and
	Principal Financial Officer

Pursuant to the requirements of the Securities Act, this amendment to the registration statement has been signed below by the following persons in the capacities and on the date indicated:

Signature		Title	Date
/s/ Jack W. Aber*		Trustee	October 16, 2012
Jack W. Aber
/s/ Bruce B. Bingham*		Trustee	October 16, 2012
Bruce B. Bingham
/s/ Christine C. Carsman*		Trustee	October 16, 2012
Christine C. Carsman
/s/ William E. Chapman, II*		Trustee	October 16, 2012
William E. Chapman, II
/s/ Edward J. Kaier*		Trustee	October 16, 2012
Edward J. Kaier
/s/ Steven J. Paggioli*		Trustee	October 16, 2012
Steven J. Paggioli
/s/ Eric Rakowski*		Trustee	October 16, 2012
Eric Rakowski
/s/ Thomas R. Schneeweis*		Trustee	October 16, 2012
Thomas R. Schneeweis
/s/ Keitha L. Kinne		President and	October 16, 2012
Keitha L. Kinne		Principal Executive Officer
		(Principal Executive Officer)
/s/ Donald S. Rumery		Treasurer,	October 16, 2012
Donald S. Rumery		Chief Financial Officer, and
		Principal Financial Officer
		(Principal Accounting Officer)
		(Principal Financial Officer)
*By:	/s/ Donald S. Rumery
	Donald S. Rumery
	Pursuant to Powers of Attorney incorporated herein by reference
	Date: October 16, 2012

Managers AMG Funds

Exhibit Index

Exhibit No.	Description
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

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 01, 2012
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Essex Small/Micro Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Essex Small/Micro Cap Growth Fund's (the "Fund") investment objective is to achieve long-term capital appreciation.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts on Class A shares if you or your family invests at least $25,000 in Class A shares of funds within the Managers Family of Funds. More information about these and other discounts is available from your financial professional and in "Sales Charge Reductions and Waivers" on page 13 of the Fund's prospectus and "Reductions and Waivers of Sales Charges" on page 43 of the Fund's statement of additional information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 74% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	74.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts on Class A shares if you or your family invests at least $25,000 in Class A shares of funds within the Managers Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	25,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXPENSE EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example will help you compare the cost of investing in the Fund to the cost of investing in other mutual funds. The Example makes certain assumptions. It assumes that you invest $10,000 as an initial investment in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. It also assumes that your investment has a 5% total return each year and the Fund's operating expenses remain the same. The Example reflects the impact of the Fund's contractual expense limitation through October 1, 2013.
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	Although your actual costs may be higher or lower, based on the above assumptions, your cost would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	The figures shown above for Class A shares would be the same whether you sold your shares at the end of a period or kept them. For Class C shares, you would pay the following expenses if you did not redeem your shares:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in common and preferred stocks of small-capitalization U.S. companies. Essex Investment Management Company, LLC ("Essex") generally considers a company to be a "small-capitalization" company if, at the time of purchase, its market capitalization is less than or equal to the market capitalization of the largest company included within the Russell 2000 ® Growth Index. As of the latest reconstitution of the Index on May 31, 2012, the market capitalization of the largest company included in the Russell 2000® Growth Index was approximately $2.6 billion. This figure may fluctuate as market conditions change and during periods of increased market volatility. The Fund's investments include U.S. micro-cap companies, which, at the time of purchase, have capitalizations that place them among the smallest 5% of companies listed on U.S. exchanges or in over the counter (OTC) markets. The Fund currently invests a significant portion of its assets in companies in the technology and health care sectors. In addition, the Fund may also invest in foreign securities, primarily in the form of American Depositary Receipts ("ADRs") and emerging market securities. Essex serves as subadvisor to the Fund and applies fundamental investment research techniques when deciding which stocks to buy or sell. Typically, Essex:   •    Selects companies that demonstrate accelerating growth in earnings and              revenues that Essex believes are undervalued given their financial strength.   •    Invests in companies from all sectors of the market based on Essex's                fundamental research and analysis of various characteristics.                  •    Reviews and evaluates each company's financial statements, sales and expense        trends, earnings estimates, market position, and industry outlook.             •    Values a company against its history, industry, and the market to identify a        relatively undervalued stock as compared to its potential growth.              •    Sells all or part of the Fund's holdings in a particular stock if the               valuation is no longer attractive compared with expectations of the Fund's          long-term growth.                                                            While Essex is committed to a small-cap and micro-cap focus for the overall portfolio, Essex may decide to keep a company's stock if it has appreciated beyond the market capitalization of the largest company included in the Russell 2000® Growth Index, as described above.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	There is the risk that you may lose money on your investment. All investments carry a certain amount of risk and the Fund cannot guarantee that it will achieve its investment objective. An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation ("FDIC") or any other government agency. Below are some of the risks of investing in the Fund. Emerging Markets Risk-investments in emerging markets can be subject to the general risks of foreign investments, as well as additional risks which can result in greater price volatility. Foreign Securities Risk-securities or other investments of foreign issuers involve additional risks (such as risks arising from less frequent trading, changes in political or social conditions, and less publicly available information about non-U.S. issuers) that differ from those associated with investing in securities of U.S. issuers and may result in greater price volatility. Growth Stock Risk-growth stocks may be more sensitive to market movements because their prices tend to reflect future investor expectations rather than just current profits. Market Risk-market prices of securities held by the Fund may fall rapidly or unpredictably due to a variety of factors, including changing economic, political, or market conditions. Political Risk-changes in the political status of any country can have profound effects on the value of investments exposed to that country. Sector Risk-companies or issuers that are in similar industry sectors may be similarly affected by particular economic or market events; to the extent the Fund has substantial holdings within a particular sector, the risks associated with that sector increase. Stocks in the technology, industrials, and health care sectors currently, and may in the future, comprise a significant portion of the Fund's portfolio. The technology industries may be affected by technological obsolescence, short product cycles, falling prices and profits, competitive pressures and general market conditions. Industrial industries companies may be affected by general economic trends, including employment, economic growth and interest rates, changes in consumer confidence and spending, government regulation, commodity prices and competitive pressures. Companies in the health care sector may be affected by government regulation, government approval of products and services, technological obsolescence, patent expirations, product liability or other litigation, and changes in governmental and private payment systems. Small- and Micro-Capitalization Stock Risk-the stocks of small- and micro-capitalization companies often have greater price volatility, lower trading volume, and less liquidity than the stocks of larger, more established companies.
Risk Lose Money [Text]	rr_RiskLoseMoney	There is the risk that you may lose money on your investment.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a deposit or obligation of any bank, is not endorsed or guaranteed by any bank, and is not insured by the Federal Deposit Insurance Corporation ("FDIC") or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following performance information illustrates the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's performance compares to that of a broad-based securities market index. Annual returns shown in the bar chart do not reflect front end or deferred sales charges (loads), and if these amounts were reflected, returns would be less than those shown. Maximum sales charges (loads) are reflected in the annual returns table. As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future. To obtain updated performance information please visit www.managersinvest.com or call 800.835.3879. The performance information shown in the bar chart and table includes performance of the Fund's predecessor, a 401(k) plan trust (the "Predecessor Account"), for periods prior to the Fund's inception on June 25, 2002. The Predecessor Account was not registered with the Securities and Exchange Commission and therefore was not subject to the investment restrictions imposed on registered mutual funds. If the Predecessor Account had been registered, its performance may have been adversely affected. The Predecessor Account was also subject to different fees and expenses than the Fund. Prior to March 1, 2006, the Fund had a single share class, which did not carry a front-end sales charge (load). On March 1, 2006, the existing shares were redesignated as Class A shares. Performance for Class A shares below is based on the performance of the Fund prior to March 1, 2006, and performance for Class A shares shown in the table is adjusted to reflect the sales charge applicable to Class A shares.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following performance information illustrates the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's performance compares to that of a broad-based securities market index.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.835.3879
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.managersinvest.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As always, past performance of the Fund (before and after taxes) is not an indication of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns as of 12/31/11 (Class A)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 27.07% (2nd Quarter 2003) Worst Quarter: -29.43% (4th Quarter 2008)
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses, or taxes
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Class A shares only. After-tax returns for Class C shares will vary.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only. After-tax returns for Class C shares will vary.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns as of 12/31/11
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Russell 2000® Growth Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year	rr_AverageAnnualReturnYear01	(2.91%)
5 Years	rr_AverageAnnualReturnYear05	2.09%
10 Years	rr_AverageAnnualReturnYear10	4.48%
Since Inception	rr_AverageAnnualReturnSinceInception	2.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2006
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.45%	[2]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	714
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,007
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,322
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,210
Annual Return 2002	rr_AnnualReturn2002	(21.34%)
Annual Return 2003	rr_AnnualReturn2003	66.41%
Annual Return 2004	rr_AnnualReturn2004	15.74%
Annual Return 2005	rr_AnnualReturn2005	13.90%
Annual Return 2006	rr_AnnualReturn2006	8.55%
Annual Return 2007	rr_AnnualReturn2007	17.45%
Annual Return 2008	rr_AnnualReturn2008	(47.72%)
Annual Return 2009	rr_AnnualReturn2009	30.97%
Annual Return 2010	rr_AnnualReturn2010	28.01%
Annual Return 2011	rr_AnnualReturn2011	(10.78%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	27.07%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(29.43%)
Label	rr_AverageAnnualReturnLabel	Class A Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	15.90%
5 Years	rr_AverageAnnualReturnYear05	(2.84%)
10 Years	rr_AverageAnnualReturnYear10	4.95%
Since Inception	rr_AverageAnnualReturnSinceInception
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A Return After Taxes on Distributions
1 Year	rr_AverageAnnualReturnYear01	15.90%
5 Years	rr_AverageAnnualReturnYear05	(2.87%)
10 Years	rr_AverageAnnualReturnYear10	4.71%
Since Inception	rr_AverageAnnualReturnSinceInception
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year	rr_AverageAnnualReturnYear01	10.34%
5 Years	rr_AverageAnnualReturnYear05	(2.39%)
10 Years	rr_AverageAnnualReturnYear10	4.25%
Since Inception	rr_AverageAnnualReturnSinceInception
Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.20%	[2]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	323
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	688
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,180
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,534
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	223
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	688
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,180
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,534
Label	rr_AverageAnnualReturnLabel	Class C Return Before Taxes
1 Year	rr_AverageAnnualReturnYear01	12.34%
5 Years	rr_AverageAnnualReturnYear05	(2.42%)
10 Years	rr_AverageAnnualReturnYear10
Since Inception	rr_AverageAnnualReturnSinceInception	(2.71%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 01, 2006

[1] For purchases of Class A shares of $1 million or more that are not assessed a sales charge at the time of purchase, you will be charged a 1% fee on shares redeemed or exchanged for shares not subject to an initial sales charge within the first 18 months of purchase.

[2] Managers Investment Group LLC (the "Investment Manager") has contractually agreed, through October 1, 2013, to waive management fees and/or reimburse Fund expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts), brokerage commissions and other transaction costs, acquired fund fees and expenses, and extraordinary expenses) to 1.49% and 2.24% of the average daily net assets of Class A and Class C shares, respectively, subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months from the time of any waiver, reimbursement, or payment pursuant to the Fund's contractual expense limitation, the Investment Manager may recover from the Fund fees waived and expenses paid to the extent that such repayment would not cause the Fund's Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements to exceed the contractual expense limitation amount. Acquired Fund Fees and Expenses are not subject to waiver and do not factor into the Fund's contractual expense limitation. The contractual expense limitation can only be terminated upon termination of the Fund's investment advisory agreement with the Investment Manager or by mutual agreement between the Investment Manager and the Fund's Board of Trustees.

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Managers AMG Funds - Essex Small/Micro Cap Growth Fund (Prospectus Summary) | Managers AMG Funds - Essex Small/Micro Cap Growth Fund

Essex Small/Micro Cap Growth Fund

INVESTMENT OBJECTIVE

The Essex Small/Micro Cap Growth Fund's (the "Fund") investment objective is to
achieve long-term capital appreciation.

FEES AND EXPENSES OF THE FUND

The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. You may qualify for sales charge discounts on Class A
shares if you or your family invests at least $25,000 in Class A shares of funds
within the Managers Family of Funds. More information about these and other
discounts is available from your financial professional and in "Sales Charge
Reductions and Waivers" on page 13 of the Fund's prospectus and "Reductions and
Waivers of Sales Charges" on page 43 of the Fund's statement of additional
information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Managers AMG Funds - Essex Small/Micro Cap Growth Fund	Class A		Class C
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of the offering price)	5.75%		none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the offering price or redemption proceeds)	none	[1]	1.00%

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

Annual Fund Operating Expenses Managers AMG Funds - Essex Small/Micro Cap Growth Fund		Class A	Class C
Management Fee		1.00%	1.00%
Distribution and Service (12b-1) Fees		0.25%	1.00%
Other Expenses		0.20%	0.20%
Total Annual Fund Operating Expenses	[1]	1.45%	2.20%

EXPENSE EXAMPLE

This Example will help you compare the cost of investing in the Fund to the cost
of investing in other mutual funds. The Example makes certain assumptions. It
assumes that you invest $10,000 as an initial investment in the Fund for the
time periods indicated and then redeem all of your shares at the end of those
periods. It also assumes that your investment has a 5% total return each year
and the Fund's operating expenses remain the same. The Example reflects the
impact of the Fund's contractual expense limitation through October 1, 2013.

Although your actual costs may be higher or lower, based on the above assumptions, your cost would be:

Expense Example Managers AMG Funds - Essex Small/Micro Cap Growth Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	714	1,007	1,322	2,210
Class C	323	688	1,180	2,534

The figures shown above for Class A shares would be the same whether you sold your shares at the end of a period or kept them. For Class C shares, you would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Managers AMG Funds - Essex Small/Micro Cap Growth Fund Class C	223	688	1,180	2,534

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as commissions, when it buys and sells
securities (or "turns over" its portfolio). A higher portfolio turnover rate
may indicate higher transaction costs and may result in higher taxes when Fund
shares are held in a taxable account. These costs, which are not reflected in
Annual Fund Operating Expenses or in the Example, affect the Fund's performance.
During the most recent fiscal year, the Fund's portfolio turnover rate was 74%
of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal circumstances, the Fund invests at least 80% of its net assets, plus
the amount of any borrowings for investment purposes, in common and preferred
stocks of small-capitalization U.S. companies.

Essex Investment Management Company, LLC ("Essex") generally considers a company
to be a "small-capitalization" company if, at the time of purchase, its market
capitalization is less than or equal to the market capitalization of the largest
company included within the Russell 2000 ® Growth Index. As of the latest
reconstitution of the Index on May 31, 2012, the market capitalization of the
largest company included in the Russell 2000® Growth Index was approximately
$2.6 billion. This figure may fluctuate as market conditions change and during
periods of increased market volatility. The Fund's investments include U.S.
micro-cap companies, which, at the time of purchase, have capitalizations that
place them among the smallest 5% of companies listed on U.S. exchanges or in over
the counter (OTC) markets. The Fund currently invests a significant portion of
its assets in companies in the technology and health care sectors. In addition,
the Fund may also invest in foreign securities, primarily in the form of American
Depositary Receipts ("ADRs") and emerging market securities.

Essex serves as subadvisor to the Fund and applies fundamental investment
research techniques when deciding which stocks to buy or sell. Typically, Essex:

  •    Selects companies that demonstrate accelerating growth in earnings and      
       revenues that Essex believes are undervalued given their financial strength.

  •    Invests in companies from all sectors of the market based on Essex's        
       fundamental research and analysis of various characteristics.               

  •    Reviews and evaluates each company's financial statements, sales and expense
       trends, earnings estimates, market position, and industry outlook.          

  •    Values a company against its history, industry, and the market to identify a
       relatively undervalued stock as compared to its potential growth.           

  •    Sells all or part of the Fund's holdings in a particular stock if the       
       valuation is no longer attractive compared with expectations of the Fund's  
       long-term growth.                                                           

While Essex is committed to a small-cap and micro-cap focus for the overall portfolio,
Essex may decide to keep a company's stock if it has appreciated beyond the market
capitalization of the largest company included in the Russell 2000® Growth Index, as
described above.

PRINCIPAL RISKS

There is the risk that you may lose money on your investment. All investments
carry a certain amount of risk and the Fund cannot guarantee that it will
achieve its investment objective. An investment in the Fund is not a deposit
or obligation of any bank, is not endorsed or guaranteed by any bank, and is
not insured by the Federal Deposit Insurance Corporation ("FDIC") or any other
government agency. Below are some of the risks of investing in the Fund.

Emerging Markets Risk-investments in emerging markets can be subject to the
general risks of foreign investments, as well as additional risks which can
result in greater price volatility.

Foreign Securities Risk-securities or other investments of foreign issuers
involve additional risks (such as risks arising from less frequent trading,
changes in political or social conditions, and less publicly available
information about non-U.S. issuers) that differ from those associated with
investing in securities of U.S. issuers and may result in greater price
volatility.

Growth Stock Risk-growth stocks may be more sensitive to market movements
because their prices tend to reflect future investor expectations rather than
just current profits.

Market Risk-market prices of securities held by the Fund may fall rapidly or
unpredictably due to a variety of factors, including changing economic,
political, or market conditions.

Political Risk-changes in the political status of any country can have profound
effects on the value of investments exposed to that country.

Sector Risk-companies or issuers that are in similar industry sectors may be
similarly affected by particular economic or market events; to the extent the
Fund has substantial holdings within a particular sector, the risks associated
with that sector increase. Stocks in the technology, industrials, and health
care sectors currently, and may in the future, comprise a significant portion of
the Fund's portfolio. The technology industries may be affected by technological
obsolescence, short product cycles, falling prices and profits, competitive
pressures and general market conditions. Industrial industries companies may be
affected by general economic trends, including employment, economic growth and
interest rates, changes in consumer confidence and spending, government
regulation, commodity prices and competitive pressures. Companies in the health
care sector may be affected by government regulation, government approval of
products and services, technological obsolescence, patent expirations, product
liability or other litigation, and changes in governmental and private payment
systems.

Small- and Micro-Capitalization Stock Risk-the stocks of small- and
micro-capitalization companies often have greater price volatility, lower
trading volume, and less liquidity than the stocks of larger, more established
companies.

PERFORMANCE

The following performance information illustrates the risks of investing in the
Fund by showing changes in the Fund's performance from year to year and by
showing how the Fund's performance compares to that of a broad-based securities
market index. Annual returns shown in the bar chart do not reflect front end or
deferred sales charges (loads), and if these amounts were reflected, returns
would be less than those shown. Maximum sales charges (loads) are reflected in
the annual returns table. As always, past performance of the Fund (before and
after taxes) is not an indication of how the Fund will perform in the future. To
obtain updated performance information please visit www.managersinvest.com or
call 800.835.3879.

The performance information shown in the bar chart and table includes performance
of the Fund's predecessor, a 401(k) plan trust (the "Predecessor Account"), for
periods prior to the Fund's inception on June 25, 2002. The Predecessor Account
was not registered with the Securities and Exchange Commission and therefore was
not subject to the investment restrictions imposed on registered mutual funds.
If the Predecessor Account had been registered, its performance may have been
adversely affected. The Predecessor Account was also subject to different fees
and expenses than the Fund.

Prior to March 1, 2006, the Fund had a single share class, which did not carry a
front-end sales charge (load). On March 1, 2006, the existing shares were
redesignated as Class A shares. Performance for Class A shares below is based on
the performance of the Fund prior to March 1, 2006, and performance for Class A
shares shown in the table is adjusted to reflect the sales charge applicable to
Class A shares.

Calendar Year Total Returns as of 12/31/11 (Class A)

Best Quarter: 27.07% (2nd Quarter 2003)

Worst Quarter: -29.43% (4th Quarter 2008)

Average Annual Total Returns as of 12/31/11

Average Annual Total Returns Managers AMG Funds - Essex Small/Micro Cap Growth Fund	Label	1 Year	5 Years	10 Years	Since Inception	Inception Date
Class A	Class A Return Before Taxes	15.90%	(2.84%)	4.95%
Class A After Taxes on Distributions	Class A Return After Taxes on Distributions	15.90%	(2.87%)	4.71%
Class A After Taxes on Distributions and Sales	Class A Return After Taxes on Distributions and Sale of Fund Shares	10.34%	(2.39%)	4.25%
Class C	Class C Return Before Taxes	12.34%	(2.42%)		(2.71%)	Mar. 01, 2006
Russell 2000® Growth Index	Russell 2000® Growth Index (reflects no deduction for fees, expenses, or taxes)	(2.91%)	2.09%	4.48%	2.17%	Mar. 01, 2006

After-tax returns are calculated using the historical highest individual federal
marginal income tax rates and do not reflect the impact of state and local taxes.
Actual after-tax returns depend on an investor's tax situation and may differ
from those shown. After-tax returns are not relevant to investors who hold their
Fund shares through tax-deferred arrangements, such as 401(k) plans or individual
retirement accounts. After-tax returns are shown for Class A shares only. After-tax
returns for Class C shares will vary.

[1] For purchases of Class A shares of $1 million or more that are not assessed a sales charge at the time of purchase, you will be charged a 1% fee on shares redeemed or exchanged for shares not subject to an initial sales charge within the first 18 months of purchase.

[1] Managers Investment Group LLC (the "Investment Manager") has contractually agreed, through October 1, 2013, to waive management fees and/or reimburse Fund expenses in order to limit Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements (exclusive of taxes, interest (including interest incurred in connection with bank and custody overdrafts), brokerage commissions and other transaction costs, acquired fund fees and expenses, and extraordinary expenses) to 1.49% and 2.24% of the average daily net assets of Class A and Class C shares, respectively, subject to later reimbursement by the Fund in certain circumstances. In general, for a period of up to 36 months from the time of any waiver, reimbursement, or payment pursuant to the Fund's contractual expense limitation, the Investment Manager may recover from the Fund fees waived and expenses paid to the extent that such repayment would not cause the Fund's Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements to exceed the contractual expense limitation amount. Acquired Fund Fees and Expenses are not subject to waiver and do not factor into the Fund's contractual expense limitation. The contractual expense limitation can only be terminated upon termination of the Fund's investment advisory agreement with the Investment Manager or by mutual agreement between the Investment Manager and the Fund's Board of Trustees.