485BPOS

As filed with the Securities and Exchange Commission on December 7, 2012

Securities Act Registration No. 33-10451

Investment Company Act Registration No. 811-4920

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

  REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 X    

Post-Effective Amendment No. 69            X

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 X    

Amendment No. 71                                     X

(Check appropriate box or boxes)

WASATCH FUNDS TRUST

(Exact Name of Registrant as Specified in Charter)

150 Social Hall Avenue

4th Floor

Salt Lake City, Utah 84111

(Address of Principal Executive Offices)

Registrant’s Telephone Number, including Area Code: (801) 533-0777

(Name and Address of Agent for Service)	Copy to:
Samuel S. Stewart, Jr. Wasatch Advisors, Inc. 150 Social Hall Avenue, 4th Floor Salt Lake City, Utah 84111	Eric F. Fess Chapman and Cutler LLP 111 West Monroe Street Chicago, IL 60603

Approximate Date of Proposed Public Offering: As soon as practicable following effectiveness.

It is proposed that this filing will become effective:

( X ) immediately upon filing pursuant to paragraph (b)

(  ) on                  pursuant to paragraph (b)

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

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

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

(  ) on                  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, as amended and the Investment Company Act of 1940, as amended, the Registrant certifies that this Post-Effective Amendment No. 69 to the Registration Statement meets all the requirements for effectiveness pursuant to Rule 485(b) of the Securities Act of 1933, as amended, and the Registrant has duly caused this Post-Effective Amendment No. 69 under the Securities Act of 1933, as amended and Post-Effective Amendment No. 71 under the Investment Company Act of 1940, as amended to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Salt Lake City, and the State of Utah on the 7^th day of December 2012.

WASATCH FUNDS TRUST
By	/s/ Samuel S. Stewart, Jr.
	Samuel S. Stewart, Jr., Ph.D.,
	President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Signature	Title	Date
/s/ Samuel S. Stewart, Jr. Samuel S. Stewart, Jr., Ph.D.	President and Trustee (principal executive officer)	December 7, 2012
/s/ Cindy B. Firestone Cindy B. Firestone	Treasurer (principal financial and accounting officer)	December 7, 2012
James U. Jensen* James U. Jensen, Esquire	Trustee	December 7, 2012
William R. Swinyard* William R. Swinyard	Trustee	December 7, 2012
D. James Croft* D. James Croft	Trustee	December 7, 2012
Miriam M. Allison* Miriam M. Allison	Trustee	December 7, 2012
Heikki Rinne* Heikki Rinne	Trustee	December 7, 2012
/s/ Russell L. Biles Russell L. Biles Attorney-in-Fact

December 7, 2012

*Signed pursuant to powers of attorney are incorporated herein by reference to Exhibit (q) in Post-Effective Amendment No. 50 to the Registrant’s Registration Statement on Form N-1A filed with the Commission on March 31, 2010 and a power of attorney incorporated herein by reference to Exhibit q-1 in Post-Effective Amendment No. 65 to the Registrant’s Registration Statement on Form N-1A filed with the Commission on October 2, 2012.

Exhibit Index

Exhibit No.
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

Investor Class | Wasatch Emerging Markets Select Fund

WASATCH EMERGING MARKETS SELECT FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term growth of capital.

FEES AND EXPENSES OF THE FUND

The tables below describe the fees and expenses that you may pay if you buy, sell or hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	Investor Class Wasatch Emerging Markets Select Fund Investor Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Investor Class Wasatch Emerging Markets Select Fund Investor Class Shares
Management Fee		1.25%
Distribution/Service (12b-1) Fee		none
Other Expenses	[1]	1.02%
Total Annual Fund Operating Expenses	[1]	2.27%
Expense Reimbursement		(0.58%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.69%

EXAMPLE

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Fund for the time periods indicated and then redeemed all of your shares at the end of those periods. The example also assumes that your investment had a 5% return each year and that the Fund’s operating expenses (as a percentage of net assets) remained the same. The example reflects contractual fee waivers and reimbursements through January 31, 2014. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	1 Year	3 Years
Investor Class Wasatch Emerging Markets Select Fund Investor Class Shares	172	654

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.

PRINCIPAL STRATEGIES

The Fund invests primarily in companies of all market capitalizations that are tied economically to emerging market countries.
Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries.
Emerging market countries are those currently included in the Morgan Stanley Capital International (MSCI) Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country.
We travel extensively outside the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis with the goal of owning the highest quality growth companies tied economically to emerging market countries. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, suppliers and customers.
We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries.
The Fund may invest a large percentage of its assets in a few sectors.
The Fund may invest in initial public offerings (IPOs) and early stage companies.
The Fund is non-diversified, meaning that it can concentrate investments in a more limited number of issuers than a diversified fund. Under normal market conditions, the Fund will generally invest in 30 to 50 companies; however, we may invest in fewer or more companies when we believe it is necessary to achieve the Fund’s investment objective.

PRINCIPAL RISKS

All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund.
The Fund is subject to the following principal investment risks:
Stock Market Risk. The Fund’s investments may decline due to movements in the overall stock market.
Stock Selection Risk. The Fund’s investments may decline in value even when the overall stock market is not in a general decline.
Foreign Securities Risk. Foreign securities are generally more volatile and less liquid than U.S. securities. Further, foreign securities may be subject to additional risks not associated with investment in U.S. securities due to differences in the economic and political environment, the amount of available public information, the degree of market regulation, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates.
Emerging Markets Risk. In addition to the risks of investing in foreign securities in general, the risks of investing in the securities of companies domiciled in emerging market countries include increased political or social instability, economies based on only a few industries, unstable currencies, runaway inflation, highly volatile securities markets, unpredictable shifts in policies relating to foreign investments, lack of protection for investors against parties who fail to complete transactions, and the potential for government seizure of assets or nationalization of companies.
Small Company Stock Risk. Small cap stocks may be very sensitive to changing economic conditions and market downturns because the issuers often have narrow markets, fewer product lines, and limited managerial and financial resources, resulting in volatile stock prices and a limited ability to sell them at a desirable time or price.
Growth Stock Risk. Growth stock prices may be more sensitive to changes in current or expected earnings than the prices of other stocks, and they may fall or not appreciate in step with the broader securities markets.
Convertible Securities Risk. Generally, convertible securities offer lower interest or dividend yields than non-convertible securities of similar quality and less potential for gains or capital appreciation in a rising stock market than other equity securities. They tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than the markets for common stocks or bonds. The value of convertible securities is susceptible to the risk of market losses attributable to changes in interest rates. An issuer may have the right to buy back certain convertible securities at a time and price that is unfavorable to the Fund.
Sector Weightings Risk. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect all the securities in a single sector. If the Fund invests in a few sectors it may have increased exposure to the price movements of those sectors.
Initial Public Offerings (IPOs) Risk. IPOs involve a higher degree of risk because companies involved in IPOs generally have limited operating histories and their prospects for future profitability are uncertain. Prices of IPOs may also be unstable due to the absence of a prior public market, the small number of shares available for trading and limited investor information.
Early Stage Companies Risk. Early stage companies may never obtain necessary financing, may rely on untested business plans, may not be successful in developing markets for their products or services, and may remain an insignificant part of their industry, and as such may never be profitable. Stocks of early stage companies may be illiquid, privately traded, and more volatile and speculative than the securities of larger companies.
Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.

PERFORMANCE

Ordinarily, this section of the prospectus contains information that would allow you to evaluate the performance of the Fund’s Investor Class using several different measures such as yearly changes in performance, best and worst quarterly returns and average annual total returns before and after taxes compared to a relevant benchmark. However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.

[1] Other Expenses are based on estimated expenses for the Fund for its first full fiscal year. Wasatch Advisors, Inc., the Fund's investment advisor, has contractually agreed to reimburse the Investor Class shares of Fund for Total Annual Fund Operating Expenses in excess of 1.69% (excluding interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses in excess of such limitations) until at least January 31, 2014. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WASATCH FUNDS TRUST
Prospectus Date	rr_ProspectusDate	Nov. 20, 2012
Investor Class | Wasatch Emerging Markets Select Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	WASATCH EMERGING MARKETS SELECT FUND — Summary
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is long-term growth of capital.
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, sell or hold shares of the Fund.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
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.
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Other Expenses are based on estimated expenses for the Fund for its first full fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Fund for the time periods indicated and then redeemed all of your shares at the end of those periods. The example also assumes that your investment had a 5% return each year and that the Fund’s operating expenses (as a percentage of net assets) remained the same. The example reflects contractual fee waivers and reimbursements through January 31, 2014. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in companies of all market capitalizations that are tied economically to emerging market countries. Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries. Emerging market countries are those currently included in the Morgan Stanley Capital International (MSCI) Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country. We travel extensively outside the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis with the goal of owning the highest quality growth companies tied economically to emerging market countries. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, suppliers and customers. We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries. The Fund may invest a large percentage of its assets in a few sectors. The Fund may invest in initial public offerings (IPOs) and early stage companies. The Fund is non-diversified, meaning that it can concentrate investments in a more limited number of issuers than a diversified fund. Under normal market conditions, the Fund will generally invest in 30 to 50 companies; however, we may invest in fewer or more companies when we believe it is necessary to achieve the Fund’s investment objective.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund. The Fund is subject to the following principal investment risks: Stock Market Risk. The Fund’s investments may decline due to movements in the overall stock market. Stock Selection Risk. The Fund’s investments may decline in value even when the overall stock market is not in a general decline. Foreign Securities Risk. Foreign securities are generally more volatile and less liquid than U.S. securities. Further, foreign securities may be subject to additional risks not associated with investment in U.S. securities due to differences in the economic and political environment, the amount of available public information, the degree of market regulation, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates. Emerging Markets Risk. In addition to the risks of investing in foreign securities in general, the risks of investing in the securities of companies domiciled in emerging market countries include increased political or social instability, economies based on only a few industries, unstable currencies, runaway inflation, highly volatile securities markets, unpredictable shifts in policies relating to foreign investments, lack of protection for investors against parties who fail to complete transactions, and the potential for government seizure of assets or nationalization of companies. Small Company Stock Risk. Small cap stocks may be very sensitive to changing economic conditions and market downturns because the issuers often have narrow markets, fewer product lines, and limited managerial and financial resources, resulting in volatile stock prices and a limited ability to sell them at a desirable time or price. Growth Stock Risk. Growth stock prices may be more sensitive to changes in current or expected earnings than the prices of other stocks, and they may fall or not appreciate in step with the broader securities markets. Convertible Securities Risk. Generally, convertible securities offer lower interest or dividend yields than non-convertible securities of similar quality and less potential for gains or capital appreciation in a rising stock market than other equity securities. They tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than the markets for common stocks or bonds. The value of convertible securities is susceptible to the risk of market losses attributable to changes in interest rates. An issuer may have the right to buy back certain convertible securities at a time and price that is unfavorable to the Fund. Sector Weightings Risk. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect all the securities in a single sector. If the Fund invests in a few sectors it may have increased exposure to the price movements of those sectors. Initial Public Offerings (IPOs) Risk. IPOs involve a higher degree of risk because companies involved in IPOs generally have limited operating histories and their prospects for future profitability are uncertain. Prices of IPOs may also be unstable due to the absence of a prior public market, the small number of shares available for trading and limited investor information. Early Stage Companies Risk. Early stage companies may never obtain necessary financing, may rely on untested business plans, may not be successful in developing markets for their products or services, and may remain an insignificant part of their industry, and as such may never be profitable. Stocks of early stage companies may be illiquid, privately traded, and more volatile and speculative than the securities of larger companies. Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.
Risk Lose Money [Text]	rr_RiskLoseMoney	All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Ordinarily, this section of the prospectus contains information that would allow you to evaluate the performance of the Fund’s Investor Class using several different measures such as yearly changes in performance, best and worst quarterly returns and average annual total returns before and after taxes compared to a relevant benchmark. However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.
Investor Class | Wasatch Emerging Markets Select Fund | Investor Class Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	rr_RedemptionFeeOverRedemption	2.00%
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Maximum Account Fee	rr_MaximumAccountFeeOverAssets	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution/Service (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	1.02%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.27%	[1]
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.58%)
Total Annual Fund Operating Expenses After Expense Reimbursement	rr_NetExpensesOverAssets	1.69%
1 Year	rr_ExpenseExampleYear01	172
3 Years	rr_ExpenseExampleYear03	654

[1] Other Expenses are based on estimated expenses for the Fund for its first full fiscal year. Wasatch Advisors, Inc., the Fund's investment advisor, has contractually agreed to reimburse the Investor Class shares of Fund for Total Annual Fund Operating Expenses in excess of 1.69% (excluding interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses in excess of such limitations) until at least January 31, 2014. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.

XML

Institutional Class | Wasatch Emerging Markets Select Fund

WASATCH EMERGING MARKETS SELECT FUND — Summary

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term growth of capital.

FEES AND EXPENSES OF THE FUND

The tables below describe the fees and expenses that you may pay if you buy, sell or hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	Institutional Class Wasatch Emerging Markets Select Fund Institutional Class Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	2.00%
Exchange Fee	none
Maximum Account Fee	none

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses		Institutional Class Wasatch Emerging Markets Select Fund Institutional Class Shares
Management Fee		1.25%
Distribution/Service (12b-1) Fee		none
Other Expenses	[1]	1.04%
Total Annual Fund Operating Expenses	[1]	2.29%
Expense Reimbursement		(0.79%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.50%

EXAMPLE

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Fund for the time periods indicated and then redeemed all of your shares at the end of those periods. The example also assumes that your investment had a 5% return each year and that the Fund’s operating expenses (as a percentage of net assets) remained the same. The example reflects contractual fee waivers and reimbursements through January 31, 2014. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	1 Year	3 Years
Institutional Class Wasatch Emerging Markets Select Fund Institutional Class Shares	153	640

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.

PRINCIPAL STRATEGIES

The Fund invests primarily in companies of all market capitalizations that are tied economically to emerging market countries.
Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries.
Emerging market countries are those currently included in the Morgan Stanley Capital International (MSCI) Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country.
We travel extensively outside the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis with the goal of owning the highest quality growth companies tied economically to emerging market countries. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, supplies and customers.
We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries.
The Fund may invest a large percentage of its assets in a few sectors.
The Fund may invest in initial public offerings (IPOs) and early stage companies.
The Fund is non-diversified, meaning that it can concentrate investments in a more limited number of issuers than a diversified fund. Under normal market conditions, the Fund will generally invest in 30 to 50 companies; however, we may invest in fewer or more companies when we believe it is necessary to achieve the Fund’s investment objective.

PRINCIPAL RISKS

All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund.
The Fund is subject to the following principal investment risks:
Stock Market Risk. The Fund’s investments may decline due to movements in the overall stock market.
Stock Selection Risk. The Fund’s investments may decline in value even when the overall stock market is not in a general decline.
Foreign Securities Risk. Foreign securities are generally more volatile and less liquid than U.S. securities. Further, foreign securities may be subject to additional risks not associated with investment in U.S. securities due to differences in the economic and political environment, the amount of available public information, the degree of market regulation, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates.
Emerging Markets Risk. In addition to the risks of investing in foreign securities in general, the risks of investing in the securities of companies domiciled in emerging market countries include increased political or social instability, economies based on only a few industries, unstable currencies, runaway inflation, highly volatile securities markets, unpredictable shifts in policies relating to foreign investments, lack of protection for investors against parties who fail to complete transactions, and the potential for government seizure of assets or nationalization of companies.
Small Company Stock Risk. Small cap stocks may be very sensitive to changing economic conditions and market downturns because the issuers often have narrow markets, fewer product lines, and limited managerial and financial resources, resulting in volatile stock prices and a limited ability to sell them at a desirable time or price.
Growth Stock Risk. Growth stock prices may be more sensitive to changes in current or expected earnings than the prices of other stocks, and they may fall or not appreciate in step with the broader securities markets.
Convertible Securities Risk. Generally, convertible securities offer lower interest or dividend yields than non-convertible securities of similar quality and less potential for gains or capital appreciation in a rising stock market than other equity securities. They tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than the markets for common stocks or bonds. The value of convertible securities is susceptible to the risk of market losses attributable to changes in interest rates. An issuer may have the right to buy back certain convertible securities at a time and price that is unfavorable to the Fund.
Sector Weightings Risk. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect all the securities in a single sector. If the Fund invests in a few sectors it may have increased exposure to the price movements of those sectors.
Initial Public Offerings (IPOs) Risk. IPOs involve a higher degree of risk because companies involved in IPOs generally have limited operating histories and their prospects for future profitability are uncertain. Prices of IPOs may also be unstable due to the absence of a prior public market, the small number of shares available for trading and limited investor information.
Early Stage Companies Risk. Early stage companies may never obtain necessary financing, may rely on untested business plans, may not be successful in developing markets for their products or services, and may remain an insignificant part of their industry, and as such may never be profitable. Stocks of early stage companies may be illiquid, privately traded, and more volatile and speculative than the securities of larger companies.
Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.

PERFORMANCE

Ordinarily, this section of the prospectus contains information that would allow you to evaluate the performance of the Fund’s Institutional Class using several different measures such as yearly changes in performance, best and worst quarterly returns and average annual total returns before and after taxes compared to a relevant benchmark. However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.

[1] Other Expenses are based on estimated expenses for the Fund for its first full fiscal year. Wasatch Advisors, Inc., the Fund's Investment advisor, has contractually agreed to reimburse the Institutional Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.50% (excluding interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses in excess of such limitations) until at least January 31, 2014. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.

XML

Document and Entity Information	12 Months Ended
	Nov. 20, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Nov. 20, 2012
Registrant Name	WASATCH FUNDS TRUST
Central Index Key	0000806633
Amendment Flag	false
Document Creation Date	Nov. 20, 2012
Document Effective Date	Nov. 20, 2012
Prospectus Date	Nov. 20, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WASATCH FUNDS TRUST
Prospectus Date	rr_ProspectusDate	Nov. 20, 2012
Document Creation Date	dei_DocumentCreationDate	Nov. 20, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	WASATCH FUNDS TRUST
Prospectus Date	rr_ProspectusDate	Nov. 20, 2012
Institutional Class | Wasatch Emerging Markets Select Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	WASATCH EMERGING MARKETS SELECT FUND — Summary
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is long-term growth of capital.
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, sell or hold shares of the Fund.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
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.
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Other Expenses are based on estimated expenses for the Fund for its first full fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLE
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invested $10,000 in the Fund for the time periods indicated and then redeemed all of your shares at the end of those periods. The example also assumes that your investment had a 5% return each year and that the Fund’s operating expenses (as a percentage of net assets) remained the same. The example reflects contractual fee waivers and reimbursements through January 31, 2014. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in companies of all market capitalizations that are tied economically to emerging market countries. Under normal market conditions, we will invest at least 80% of the Fund’s assets in the equity securities (including common stock, preferred stock and securities convertible into common stock) of companies that are tied economically to emerging market countries. Emerging market countries are those currently included in the Morgan Stanley Capital International (MSCI) Emerging Markets Index. We will generally consider qualifying investments to be in companies that are listed on an exchange in an emerging market country, that have at least 50% of their assets in an emerging market country, or that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services performed in an emerging market country. We travel extensively outside the U.S. to visit companies and expect to meet with senior management. We use a process of quantitative screening followed by “bottom up” fundamental analysis with the goal of owning the highest quality growth companies tied economically to emerging market countries. Our analysis may include studying a company’s financial statements, visiting company facilities, and meeting with executive management, supplies and customers. We do not use allocation models to restrict the Fund’s investments to certain regions, countries or industries. The Fund may invest a large percentage of its assets in a few sectors. The Fund may invest in initial public offerings (IPOs) and early stage companies. The Fund is non-diversified, meaning that it can concentrate investments in a more limited number of issuers than a diversified fund. Under normal market conditions, the Fund will generally invest in 30 to 50 companies; however, we may invest in fewer or more companies when we believe it is necessary to achieve the Fund’s investment objective.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund. The Fund is subject to the following principal investment risks: Stock Market Risk. The Fund’s investments may decline due to movements in the overall stock market. Stock Selection Risk. The Fund’s investments may decline in value even when the overall stock market is not in a general decline. Foreign Securities Risk. Foreign securities are generally more volatile and less liquid than U.S. securities. Further, foreign securities may be subject to additional risks not associated with investment in U.S. securities due to differences in the economic and political environment, the amount of available public information, the degree of market regulation, and financial reporting, accounting and auditing standards, and, in the case of foreign currency-denominated securities, fluctuations in currency exchange rates. Emerging Markets Risk. In addition to the risks of investing in foreign securities in general, the risks of investing in the securities of companies domiciled in emerging market countries include increased political or social instability, economies based on only a few industries, unstable currencies, runaway inflation, highly volatile securities markets, unpredictable shifts in policies relating to foreign investments, lack of protection for investors against parties who fail to complete transactions, and the potential for government seizure of assets or nationalization of companies. Small Company Stock Risk. Small cap stocks may be very sensitive to changing economic conditions and market downturns because the issuers often have narrow markets, fewer product lines, and limited managerial and financial resources, resulting in volatile stock prices and a limited ability to sell them at a desirable time or price. Growth Stock Risk. Growth stock prices may be more sensitive to changes in current or expected earnings than the prices of other stocks, and they may fall or not appreciate in step with the broader securities markets. Convertible Securities Risk. Generally, convertible securities offer lower interest or dividend yields than non-convertible securities of similar quality and less potential for gains or capital appreciation in a rising stock market than other equity securities. They tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than the markets for common stocks or bonds. The value of convertible securities is susceptible to the risk of market losses attributable to changes in interest rates. An issuer may have the right to buy back certain convertible securities at a time and price that is unfavorable to the Fund. Sector Weightings Risk. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect all the securities in a single sector. If the Fund invests in a few sectors it may have increased exposure to the price movements of those sectors. Initial Public Offerings (IPOs) Risk. IPOs involve a higher degree of risk because companies involved in IPOs generally have limited operating histories and their prospects for future profitability are uncertain. Prices of IPOs may also be unstable due to the absence of a prior public market, the small number of shares available for trading and limited investor information. Early Stage Companies Risk. Early stage companies may never obtain necessary financing, may rely on untested business plans, may not be successful in developing markets for their products or services, and may remain an insignificant part of their industry, and as such may never be profitable. Stocks of early stage companies may be illiquid, privately traded, and more volatile and speculative than the securities of larger companies. Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.
Risk Lose Money [Text]	rr_RiskLoseMoney	All investments carry some degree of risk that will affect the value of the Fund, its investment performance and the price of its shares. As a result, you may lose money if you invest in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Non-Diversification Risk. Because the Fund is non-diversified and generally invests in 30 to 50 companies, the Fund will have more exposure to the price movements of a single security or a small group of securities than funds that diversify their investments among many companies. The Fund’s total return and net asset value could fluctuate more than if a greater number of securities were held.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Ordinarily, this section of the prospectus contains information that would allow you to evaluate the performance of the Fund’s Institutional Class using several different measures such as yearly changes in performance, best and worst quarterly returns and average annual total returns before and after taxes compared to a relevant benchmark. However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	However, the Wasatch Emerging Markets Select Fund has only recently commenced operations and does not have a full calendar year of performance.
Institutional Class | Wasatch Emerging Markets Select Fund | Institutional Class Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Redemption Fee (as a % of amount redeemed on shares held 60 days or less)	rr_RedemptionFeeOverRedemption	2.00%
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Maximum Account Fee	rr_MaximumAccountFeeOverAssets	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution/Service (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	1.04%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.29%	[1]
Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.79%)
Total Annual Fund Operating Expenses After Expense Reimbursement	rr_NetExpensesOverAssets	1.50%
1 Year	rr_ExpenseExampleYear01	153
3 Years	rr_ExpenseExampleYear03	640

[1] Other Expenses are based on estimated expenses for the Fund for its first full fiscal year. Wasatch Advisors, Inc., the Fund's Investment advisor, has contractually agreed to reimburse the Institutional Class shares of the Fund for Total Annual Fund Operating Expenses in excess of 1.50% (excluding interest, taxes, brokerage commissions, other investment related costs and extraordinary expenses in excess of such limitations) until at least January 31, 2014. The Advisor may rescind the contractual limitation on expenses at any time after its expiration date.