Mutual Fund Summary Prospectus (497k)

Summary Prospectus

Managers AMG TSCM Growth Equity Fund

Investor Class: MTGVX

Service Class: MTGSX

Institutional Class: MTGIX

March 1, 2014

---

Before you invest, you may want to review the Fund’s prospectus and statement of additional information, which contain more information about the Fund and its risks. You can find the Fund’s prospectus, statement of additional information and other information about the Fund online at http://investor.managersinvest.com/prospectus_annual_reports.html. You can also get this information at no cost by calling 800/835-3879 or by sending an e-mail request to [e-mail]. The current prospectus dated March 1, 2014, and statement of additional information, dated March 1, 2014, are incorporated by reference into this summary prospectus.

Investment Objective

The Managers AMG TSCM Growth Equity Fund's (the “Fund”) investment objective is to achieve long-term capital appreciation.

Fees and Expenses of the Fund

The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

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

	Investor Class	Service Class	Institutional Class
Management Fee	0.75%	0.75%	0.75%
Distribution and Service (12b-1) Fees	0.25%	None	None
Other Expenses 1	0.81%	0.66%	0.56%
Total Annual Fund Operating Expenses	1.81%	1.41%	1.31%
Fee Waiver and Expense Reimbursements 2	(0.52)%	(0.52)%	(0.52)%
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursements	1.29%	0.89%	0.79%

¹ Other Expenses do not include extraordinary expenses as determined under generally accepted accounting principles.  If extraordinary expenses had been included, Other Expenses of the Investor Class, Service Class and Institutional Class would have been 0.83%, 0.68% and 0.59%, respectively.

² Managers Investment Group LLC (the “Investment Manager”) has contractually agreed, through at least March 1, 2015, to waive management fees (but not below zero) and/or reimburse the Fund’s 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), shareholder servicing fees, distribution and service (12b-1) fees, brokerage commissions and other transaction costs, acquired fund fees and expenses, and extraordinary expenses) of the Fund to the annual rate of 0.79% of the average daily net assets attributable to the Fund, 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 (exclusive of the items noted in the parenthetical above) to exceed the contractual expense limitation amount. Under such arrangement, if the maximum amount of shareholder servicing fees and distribution and service (12b-1) fees were charged to the classes under the current applicable plans, the total annual fund operating expenses (exclusive of the items noted in the parenthetical above) of the Investor Class, Service Class, and Institutional Class would be 1.29%, 1.04% and 0.79%, respectively, of the average daily net assets of such classes. The contractual expense limitation may only be terminated in the event the Investment Manager ceases to be the investment manager of the Fund or by mutual agreement between the Investment Manager and the Managers Trust I Board of Trustees; provided, however, that no such termination shall affect the

obligation (including the amount of the obligation) of the Trust, on behalf of the Fund, to repay amounts previously paid, waived or reimbursed by the Investment Manager with respect to periods prior to the date of such termination.

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 March 1, 2015. Although your actual costs may be higher or lower, based on the above assumptions, your costs would be:

	1 Year	3 Years	5 Years	10 Years
Investor Class	$131	$519	$932	$2,084
Service Class	$ 91	$395	$722	$1,646
Institutional Class	$ 81	$364	$668	$1,533

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 102% of the average value of its portfolio.

Principal Investment Strategies

Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities (generally common and preferred stocks). The Fund seeks to achieve its investment objective by building a concentrated U.S. equity growth portfolio that TimesSquare Capital Management, LLC (“TimesSquare” or the “Subadvisor”) believes will generate positive returns over the long-term. The Subadvisor utilizes a bottom-up, fundamental, research-intensive approach to identify a select group of approximately 30-40 stocks which the Subadvisor believes will outperform the market. The Fund anticipates making investments in companies representing a broad range of market capitalizations, which generally may include large-, mid-, and small-capitalization growth companies. It is anticipated that the

---

SUM039-0314-03

---

Managers AMG TSCM Growth Equity Fund SUMMARY PROSPECTUS

---

Fund’s market capitalization will be weighted more heavily towards large- and mid-capitalization stocks. Additionally, the Fund may invest up to 10% of its assets in Initial Public Offerings (“IPOs”). The Subadvisor utilizes fundamental growth equity research which emphasizes the quality of a company’s management, identifying superior business models that have a sustainable competitive advantage, and the potential for strong, consistent growth. Potential investments are normally generated through traditional financial analysis, company visits, and management assessments. The Fund seeks to outperform the Russell 3000 ^® Growth Index over a full market cycle. The Subadvisor may invest up to 20% of the Fund’s net assets in foreign securities. To gain exposure to foreign issuers, the Fund may invest in American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) or ordinary shares of non-U.S. listed companies.

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. The risks are described in alphabetical order and not in the order of importance or potential exposure.

Focused Investment Risk —a greater percentage of the Fund’s holdings may be focused in a smaller number of securities which may place the Fund at greater risk than a more diversified fund.

Foreign Investment Risk —securities of or other investments in 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.

IPO Risk —investing in initial public offerings (“IPOs”) is risky and the prices of stocks purchased in IPOs tend to fluctuate more widely than stocks of companies that have been publicly traded for a longer period of time. Stocks purchased in IPOs generally do not have a trading history, and information about the companies may be available for very limited periods.

Large-Capitalization Stock Risk —the stocks of large-capitalization companies are generally more mature and may not be able to reach the same levels of growth as the stocks of small- or mid-capitalization companies.

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.

Management Risk —because the Fund is an actively-managed investment portfolio, security selection or focus on securities in a particular style, market sector or group of companies may cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective. There can be no guarantee that the Subadvisor’s investment techniques and risk analysis will produce the desired result.

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 technology, industrials, and consumer discretionary 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. The consumer discretionary industries may be affected by the performance of the overall economy, consumer confidence and spending, changes in demographic and consumer tastes, interest rates, and competitive prices.

Small- and Mid-Capitalization Stock Risk —the stocks of small- and mid-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. 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.

Calendar Year Total Returns as of 12/31/13 (Service Class)

Best Quarter: 16.40% (3rd Quarter 2012)
Worst Quarter: -19.72% (3rd Quarter 2011)

---

2	Managers Investment Group

---

Managers AMG TSCM Growth Equity Fund SUMMARY PROSPECTUS

---

Average Annual Total Returns as of 12/31/13
Managers AMG TSCM Growth Equity Fund	1 Year	Since Inception
Investor Class Return Before Taxes		7/30/10
	35.76%	18.47%
Service Class Return Before Taxes		7/30/10
	36.27%	18.97%
Service Class Return After Taxes on Distributions		7/30/10
	32.05%	17.86%
Service Class Return After Taxes on Distributions and Sale of Fund Shares		7/30/10
	22.16%	14.83%
Institutional Class Return Before Taxes		7/30/10
	36.43%	18.98%
Russell 3000 ® Growth Index (reflects no deduction for fees, expenses, or taxes)		7/30/10
	34.23%	20.12%

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 Service Class shares only, and after-tax returns for Investor Class and Institutional Class shares will vary.

Portfolio Management

Investment Manager

Managers Investment Group LLC

Subadvisor

TimesSquare Capital Management, LLC

Portfolio Managers
Kenneth C. Duca, CFA
Director and Senior Portfolio Manager of TimesSquare;
Portfolio Manager of the Fund since 08/11.

Grant R. Babyak
Chief Executive Officer, Managing Director and Senior Portfolio Manager of TimesSquare;
Portfolio Manager of the Fund since 07/10.

Anthony Rosenthal, CFA
Managing Director and Senior Portfolio Manager of TimesSquare;
Portfolio Manager of the Fund since 07/10.

Buying and Selling Fund Shares

Initial Investment Minimum

Investor Class
Regular Account: $2,000
Individual Retirement Account: $1,000

Service Class
Regular Account: $100,000
Individual Retirement Account: $10,000

Institutional Class
Regular Account: $1,000,000
Individual Retirement Account: $50,000

Additional Investment Minimum

Investor Class and Service Class (all accounts): $100
Institutional Class (all accounts): $1,000

TRANSACTION POLICIES

You may purchase or sell your shares of the Fund any day that the New York Stock Exchange is open for business, either through your registered investment professional or directly to the Fund. Shares may be purchased, sold or exchanged by mail at the address listed below, by phone at 800.548.4539, online at www.managersinvest.com, or by bank wire (if bank wire instructions are on file for your account).

Managers
c/o BNY Mellon Investment Servicing (US) Inc.
P.O. Box 9769
Providence, RI 02940-9769

Tax Information

The Fund intends to make distributions that are taxable to you as ordinary income or capital gains, except when your investment is in an IRA, 401(k), or other tax-advantaged investment plan. By investing in the Fund through such a plan, you will not be subject to tax on distributions from the Fund so long as the amounts distributed remain in the plan, but you will generally be taxed upon withdrawal of monies from the plan.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s Web site for more information.

---

Managers Investment Group

3

---

THIS PAGE INTENTIONALLY LEFT BLANK