Summary Prospectus

FlexShares^® Morningstar Global Upstream Natural Resources Index Fund

March 1, 2015 Ticker: GUNR Stock Exchange: NYSE Arca

Before you invest, you may want to review the Fund’s complete Prospectus, which contains more information about the Fund and its risks. You can find the Fund’s complete Prospectus and other information about the Fund online at www.flexshares.com/prospectus. You can also get this information at no cost by calling 1-855-FLEXETF (1-855-353-9383) or by sending an e-mail request to info@flexshares.com. The Fund’s complete Prospectus and Statement of Additional Information, both dated March 1, 2015, as supplemented, are incorporated by reference into this summary prospectus and may be obtained, free of charge, at the website, phone number or e-mail address noted above.

Investment Objective

The Fund seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Morningstar® Global Upstream Natural Resources Index^SM (the “Underlying Index”).

Fees And Expenses Of The Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You will also incur usual and customary brokerage commissions when buying or selling shares of the Fund in the secondary market, which are not reflected in the example that follows:

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management Fees	0.48%
Distribution (12b-1) Fees	0.00%
Other Expenses(1)	0.01%
Total Annual Fund Operating Expenses	0.49%
Expense Reimbursement(2)	-0.01%
Total Annual Fund Operating Expenses After Expense Reimbursement	0.48%

(1)	Under the Fund’s Investment Advisory Agreement, the Fund is responsible for the following expenses: interest expenses, brokerage commissions and other trading expenses, fees and expenses of the independent trustees and their independent legal counsel, taxes and other extraordinary costs such as litigation and other expenses not incurred in the ordinary course of business.
(2)	Northern Trust Investments, Inc. (“NTI” or “Investment Adviser”) has contractually agreed to reimburse the fees and expenses of the Trust’s independent trustees and their independent legal counsel until March 1, 2016. The Fund’s Board of Trustees may terminate the contractual arrangement at any time if it determines that it is in the best interest of the Fund and its shareholders.

Example

The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5%

return each year and that the Fund’s operating expenses remain the same (taking into account the expense reimbursement arrangement for one year). Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year	$ 49
3 Years	$ 156
5 Years	$273
10 Years	$ 615

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. Portfolio turnover may vary from year to year, as well as within a year. During the most recent fiscal year, the Fund’s portfolio turnover rate was 11% of the average value of its portfolio.

Principal Investment Strategies

The Underlying Index reflects the performance of a selection of equity securities that are traded in or are issued by companies domiciled in global developed or emerging markets (including the U.S.), as determined by the Index Provider pursuant to its index methodology. The companies included in the Underlying Index have significant business operations in the ownership, management and/or production of natural resources in energy, agriculture, precious or industrial metals, timber and water resources sectors, as determined by Morningstar, Inc (the “Index Provider”) pursuant to its index methodology. In addition to tracking the performance of the Underlying Index, the Investment Adviser seeks to minimize portfolio turnover and tax inefficiencies. As of January 31, 2015, the Underlying Index comprised 120 issues with market capitalizations ranging from $686.3 million to $391.7 billion. As of the same date, the Underlying Index's five largest constituents (by weighting) were Monsanto Co., Exxon Mobil Corp.,

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BHP Billiton Ltd., Rio Tinto PLC, and Syngenta AG. As of January 31, 2015, the top five countries (by weighting) represented in the Underlying Index were the United States (37.2%), United Kingdom (17.8%), Canada (13.4%), Australia (6.7%), and Switzerland (3.6%). The Underlying Index is governed by published, objective rules for security selection, exclusion, rebalancing and adjustments for corporate actions and is reconstituted on an annual basis. The Index Provider’s index methodology and other factors will cause the composition of the Underlying Index to change over time.

NTI uses a “passive” or indexing approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.

NTI uses a representative sampling strategy to manage the Fund. “Representative sampling” is investing in a representative sample of securities that collectively has an investment profile similar to the Underlying Index. Securities selected are expected to have, in the aggregate, investment characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability and yield) and liquidity measures similar to those of the Underlying Index. The Fund may or may not hold all of the securities that are included in the Underlying Index. Funds that employ a representative sampling strategy may incur tracking error to a greater extent than a fund that seeks to replicate an index. “Replication” is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index in approximately the same proportions as in the underlying index. The Fund reserves the right to use a replication indexing strategy if NTI determines that it is in the best interests of the Fund.

Under normal circumstances, the Fund will invest at least 80% of its total assets in the securities of the Underlying Index and in American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”) (collectively “Depositary Receipts”) based on the securities in the Underlying Index. The Fund may also invest up to 20% of its assets in cash and cash equivalents, including shares of money market funds advised by NTI or its affiliates, futures contracts, options on futures contracts, forward currency contracts, options and swaps, as well as securities not included in the Underlying Index, but which NTI believes will help the Fund track its Underlying Index.

The Underlying Index is sponsored by the Index Provider,

an organization that is independent of the Fund and NTI. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information regarding the market value of the Underlying Index. Additional information regarding the Index Provider is provided in the “More Information about Underlying Indexes and Index Providers” section of the Prospectus.

The Fund is “non-diversified” under the Investment Company Act of 1940, as amended, and may invest more of its assets in fewer issuers than “diversified” funds.

Industry Concentration Policy. The Fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. As of January 31, 2015, the Fund was concentrated in the following industries: Oil, Gas & Consumable Fuels (30.0%), Metals & Mining (28.5%). The components of the Underlying Index, and the degree to which these components represent certain industries, may change over time.

Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund’s performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund’s net asset value (“NAV”), trading price, yield, total return and ability to meet its investment objective.

Asset Class Risk is the risk that securities in the Underlying Index or the Fund's portfolio may underperform in comparison to the general securities markets or other asset classes.

Commodities Risk is the risk that companies engaged in commodities-related industries, such as natural resources, are especially affected by fluctuations in the value of those commodities (that may be due to market events or regulatory developments) and these companies may lack the resources and the broad business lines to weather market downturns. This risk is exacerbated for those natural resources companies that own the underlying commodity.

Concentration Risk is the risk that, to the extent the Fund's investments are concentrated in the securities of issuers in a particular region, country, market, industry, sector or asset class, the Fund may be subject to increased price volatility and may be more susceptible to adverse eco

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nomic, market, political or regulatory occurrences affecting that region, country, market, industry, sector or asset class.

Counterparty Risk is the risk that a counterparty to a financial instrument may default on its payment obligation to the Fund. Such a default may cause the value of an investment in the Fund to decrease.

Currency Risk is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund’s investments and its returns. Because the Fund’s NAV is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund’s holdings appreciates.

Derivatives Risk is the risk of investing in derivative instruments, including liquidity, interest rate, market, credit, counterparty and management risks, as well as the risk of mispricing or improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested.

Emerging Markets Risk is the risk that markets of emerging market countries are less developed and less liquid, subject to greater price volatility and generally subject to increased economic, political, regulatory and other uncertainties than more developed markets.

Equity Securities Risk is the risk that the values of the equity securities owned by the Fund may be more volatile than other asset classes.

Foreign Securities Risk is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in U.S. securities, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund’s investments to decline. To the extent that the Fund’s assets are concentrated in a single country or geographic region, the Fund will be subject to the risks associated with that particular country or region.

Global Natural Resources Risk is the risk that the Fund is subject to the risks associated with investment in the global natural resources sector in addition to the general risk of the stock market. The natural resources sector can be significantly affected by events relating to U.S. and foreign political and economic developments and environmental

and other government regulations, as well as other factors including, but not limited to: commodity price volatility, technological developments and natural or man-made disasters. Declines in the demand for, or prices of, natural resources generally would be expected to contribute to declines in the value of the Fund’s equity securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment.

Issuer Risk is the risk that changes in the financial condition of an issuer or counterparty, changes in specific economic or political conditions that affect a particular type of security or issuer, and changes in general economic or political conditions can affect a security's or instrument's credit quality or value.

Management Risk is the risk that the representative sampling strategy used by NTI may fail to produce the intended results.

Market Risk is the risk that the Fund could lose money over short periods due to short-term market movements and over longer periods during market downturns.

Market Trading Risk is the risk that the Fund faces because its shares are listed on a securities exchange, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, and disruption in the creation/redemption process of the Fund. ANY OF THESE FACTORS MAY LEAD TO THE FUND’S SHARES TRADING AT A PREMIUM OR DISCOUNT TO NAV.

Mid Cap Stock Risk is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market.

Non-Diversification Risk is the risk that Fund performance may depend on the performance of a small number of issuers because the Fund may invest a large percentage of its assets in securities issued by or representing a small number of issuers.

Passive Investment Risk is the risk that the Fund is not actively managed and NTI does not attempt to take defensive positions in any market conditions, including declining markets.

Small Cap Stock Risk is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established compa

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nies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk.

Tracking Error Risk is the risk that the Fund’s performance may vary substantially from the performance of the Underlying Index. The Fund employs a representative sampling strategy, and may incur tracking error to a greater extent than a fund that seeks to replicate an index.

Valuation Risk is the risk that the sale price the Fund could receive for a portfolio security may differ from the Fund’s valuation of the security, particularly for securities that trade in low volume or volatile markets or that are valued using a fair value methodology. In addition, the value of the securities in the Fund’s portfolio may change on days when shareholders will not be able to purchase or sell the Fund’s shares.

It is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.

Fund Performance

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide an indication of the risks of investing in the Fund. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated information on the Fund’s performance results can be obtained by visiting www.flexshares.com.

Calendar Year Total Returns

For the periods shown in the bar chart above:

Best Quarter (3/31/2012): 8.08%

Worst Quarter (6/30/2013): -10.15%

Average Annual Total Returns

(for the periods ended December 31, 2014)

	One Year	Since Inception of Fund	Inception Date of Fund
Before Taxes	-7.43%	-1.90%	9/16/2011
After Taxes on Distributions	-7.90%	-2.21%	—
After Taxes on Distributions and Sale of Shares	-3.59%	-1.31%	—
Morningstar® Global Upstream Natural Resources IndexSM (MUNRT)*	-7.21%	-1.76%	—

*   Reflects no deduction for fees, expenses or taxes.

Average annual total returns are shown on a before- and after-tax basis for the Fund. 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 shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans. After-tax returns may exceed the return before taxes due to an assumed tax benefit from realizing a capital loss on a sale of Fund shares.

Management

Investment Adviser and Portfolio Managers. Northern Trust Investments, Inc., a subsidiary of Northern Trust Corporation, serves as the Investment Adviser of the Fund. Patrick Dwyer and Robert Anstine, each a Vice President of Northern Trust Investments, Inc., have served as Portfolio

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Managers of the Fund since February 2014 and October 2013, respectively.

Purchase and Sale of Fund Shares

The Fund is an exchange-traded fund (commonly referred to as an “ETF”). Individual Fund shares may only be purchased and sold on a national securities exchange through a broker-dealer. The price of Fund shares is based on market price, and because ETF shares trade at market prices rather than NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). The Fund will only issue or redeem shares that have been aggregated into blocks of 50,000 shares or multiples thereof (“Creation Units”) to authorized participants who have entered into agreements with the Fund's distributor. The Fund will issue or redeem Creation Units in return for a basket of assets that the Fund specifies each day.

Tax Information

The Fund’s distributions are generally taxable to you as ordinary income, qualified dividends, capital gains, or a combination of the three, unless you are investing through a tax-exempt or tax-deferred arrangement, such as a 401(k) plan or an individual retirement account. Distributions may be taxable upon withdrawal from tax-deferred accounts.

Payments to Brokers-Dealers and Other Financial Intermediaries

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), NTI and its related companies may pay the intermediary for activities related to the marketing and promotion of the Fund. 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 website for more information.

FS00022-0315

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