485BPOS

Filed with the U.S. Securities and Exchange Commission on February 22, 2013

1933 Act Registration File No.   033-12213

1940 Act File No. 811-05037

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		[	X	]
Pre-Effective Amendment No.		[		]
Post-Effective Amendment No.	493	[	X	]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		[	X		]
Amendment No.	494	[		X	]

(Check appropriate box or boxes)

PROFESSIONALLY MANAGED PORTFOLIOS

(Exact Name of Registrant as Specified in Charter)

615 East Michigan Street

Milwaukee, WI  53202

(Address of Principal Executive Offices, including Zip Code)

Registrant’s Telephone Number, including Area Code:  (626) 914-7363

Elaine E. Richards, Esq.

Professionally Managed Portfolios

2020 E. Financial Way, Ste. 100

Glendora, CA 91741

(Name and Address of Agent for Service)

Copy to:

Domenick Pugliese, Esq.

Paul Hastings LLP

Park Avenue Tower

75 East 55th Street

New York, NY 10022

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

[	X	]	immediately upon filing pursuant to paragraph (b)
[		]	On (date) pursuant to paragraph (b)
[		]	60 days after filing pursuant to paragraph (a)(1)
[		]	on (date) pursuant to paragraph (a)(1)
[		]	75 days after filing pursuant to paragraph (a)(2)
[		]	on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

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

Explanatory Note: This Post-Effective Amendment (“PEA”) No. 493 to the Registration Statement of Professionally Managed Portfolios (the “Trust”) on Form N-1A hereby incorporates Parts A, B and C from the Trust’s PEA No. 488 on Form N-1A filed on January 29, 2013.  This PEA No. 493 is filed for the sole purpose of submitting the XBRL exhibit for the risk/return summary first provided in PEA No. 488 to the Trust’s Registration Statement.

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 it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment No. 493 to its Registration Statement on Form N-1A to be signed below on its behalf by the undersigned, duly authorized, in the City of Glendora and State of California, on February 22, 2013.

Professionally Managed Portfolios

By:  Eric W. Falkeis*                                 

Eric W. Falkeis

President

 Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 493 to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
Steven J. Paggioli*	Trustee	February 22, 2013
Steven J. Paggioli
Dorothy A. Berry*	Trustee	February 22, 2013
Dorothy A. Berry
Wallace L. Cook*	Trustee	February 22, 2013
Wallace L. Cook
Carl A. Froebel*	Trustee	February 22, 2013
Carl A. Froebel
Eric W. Falkeis*	President and Trustee	February 22, 2013
Eric W. Falkeis
Patrick J. Rudnick*	Treasurer and Principal	February 22, 2013
Patrick J. Rudnick	Financial and Accounting Officer
*By: /s/ Elaine E. Richards		February 22, 2013
Elaine E. Richards, Attorney-In Fact  pursuant  to Power of Attorney

1

INDEX TO EXHIBITS

Exhibit	Exhibit No.
Instance Document	EX-101.INS
Schema Document	EX-101.SCH
Calculation Linkbase Document	EX-101.CAL
Definition Linkbase Document	EX-101.DEF
Label Linkbase Document	EX-101.LAB
Presentation Linkbase Document	EX-101.PRE

2

XML

Boston Common U.S. Equity Fund | Boston Common U.S. Equity Fund

Boston Common U.S. Equity Fund

Investment Objective

The Boston Common U.S. Equity Fund (the “U.S. Equity Fund”) seeks long-term capital appreciation.

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 U.S. Equity Fund.

Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)

Shareholder Fees	Boston Common U.S. Equity Fund
Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)	2.00%

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

Annual Fund Operating Expenses		Boston Common U.S. Equity Fund
Management Fees		0.75%
Distribution and Service (12b-1) Fees		none
Other Expenses		13.19%
Total Annual Fund Operating Expenses		13.94%
Fee Reduction and/or Expense Reimbursement		(12.94%)
Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement	[1]	1.00%

Example

This Example is intended to help you compare the cost of investing in the U.S. Equity Fund with the cost of investing in other mutual 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 contractual Expense Cap for the first year).

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Boston Common U.S. Equity Fund	102	1,462	3,657	7,639

Portfolio Turnover

The U.S. Equity 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 above example, affect the Fund’s performance.  Since the Fund’s inception on April 30, 2012, through the fiscal period ended September 30, 2012, the U.S. Equity Fund’s portfolio turnover rate was 10% of the average value of its portfolio.

Principal Investment Strategies

Boston Common seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent profitability over a long time horizon.  We include those companies in our portfolios that we believe are operating successfully in economic sectors with superior end-market growth, or are beneficiaries of broader sector themes we have identified, but that we judge to be trading at discounts to their intrinsic value.  We seek to integrate environmental, social, and governance (“ESG”) criteria into the stock selection process and express a preference for best-in-class firms with innovative approaches to the environmental and social challenges their industries, society, and the world face.  Best-in-class refers to firms that Boston Common views as having better records on ESG criteria than other firms in the same industry or sector.

Boston Common endeavors to integrate financial and sustainability factors into its investment process because we believe ESG research helps us identify companies that will be successful over the long-term.   We seek companies that can capitalize on new market opportunities, implement efficiency improvements and avoid unanticipated costs stemming from inadequate attention to ESG risks.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control.  We may sell a security when its price reaches a set target, if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage company managements towards greater transparency, accountability, disclosure and commitment to ESG issues.

The U.S. Equity Fund will normally invest at least 80% of its net assets, including borrowings for investment purposes, in equity securities of U.S. companies.  Equity securities include common and preferred stocks as well as securities that are convertible into common stocks.  The Fund may also invest up to 20% of its total assets in ADRs.  The Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

The U.S. Equity Fund will not change its investment policy of investing at least 80% of its net assets in equity securities of U.S. companies without first changing the Fund’s name and providing shareholders with at least 60 days’ prior written notice.

Principal Investment Risks

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund.  The following riskscould affect the value of your investmentin the Fund:

● General Market Risk:  The market price of a security may fluctuate, sometimes rapidly and unpredictably.  These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.  Globally, financial markets continue to experience uncertainty and stress, which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual stocks.

● Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value.

● Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

● Foreign Securities Risk:  Foreign securities, including ADRs, are subject to increased risks including political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets.

● Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

● Sustainability (ESG) Policy Risk:  The Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

● New Fund Risk:  The Fund is new with a short operating history and there can be no assurance that the Fund will grow to or maintain an economically viable size.

Performance

Because the U.S. Equity Fund recently commenced operations, it does not have a full calendar year of performance to compare against a broad measure of market performance.  Accordingly, performance information is not available.  Performance information will be available after the Fund has been in operation for one calendar year.  At that time, the performance information will provide some indication of the risks of investing in the Fund by comparing it against a broad measure of market performance.

[1] The Adviser has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement for the U.S. Equity Fund to 1.00% of average daily net assets (the "Expense Cap"). The Expense Cap is indefinite, but will remain in effect until at least January 31, 2014 and may be terminated at any time by the Board upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the Fund toward operating expenses for the fiscal year (taking into account the reimbursement) does not exceed the Expense Cap.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Boston Common International Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Boston Common International Fund (the “International Fund”) seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the International 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

2014-01-31

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The International 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 above example, affect the Fund’s performance.  During the most recent fiscal year, ended September 30, 2012, the Fund’s portfolio turnover rate was 33% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

33.00%

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 International Fund with the cost of investing in other mutual 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 contractual Expense Cap for the first year).

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Boston Common seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent profitability over a long time horizon.  We include those companies in our portfolios that we believe are operating successfully in economic sectors with superior end-market growth, or are beneficiaries of broader sector themes we have identified, but that we judge to be trading at discounts to their intrinsic value.  We seek to integrate environmental, social, and governance (“ESG”) criteria into the stock selection process and express a preference for best-in-class firms with innovative approaches to the environmental and social challenges their industries, society, and the world face.  Best-in-class refers to firms that Boston Common views as having better records on ESG criteria than other firms in the same industry or sector.

Boston Common endeavors to integrate financial and sustainability factors into its investment process because we believe ESG research helps us identify companies that will be successful over the long-term.  We seek companies that can capitalize on new market opportunities, implement efficiency improvements and avoid unanticipated costs stemming from inadequate attention to ESG risks.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control. We may sell a security when its price reaches a set target, if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage company managements towards greater transparency, accountability, disclosure and commitment to ESG issues.

The International Fund will normally invest at least 80% of its net assets, including borrowings for investment purposes, in securities of non-U.S. companies.  The Fund may invest in common and preferred stocks as well as securities that are convertible into common stocks.  The Fund may also invest in ADRs, European Depositary Receipts (“EDRs”) and Global Depositary Receipts (“GDRs”).  Up to 20% of the Fund’s total assets may be invested in securities of companies located in emerging markets.  The Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

The International Fund will not change its investment policy of investing at least 80% of its net assets in equity securities of non-U.S. companies without first changing the Fund’s name and providing shareholders with at least 60 days’ prior written notice.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

There is the risk that you could lose all or a portion of your investment in the International Fund.  The following riskscould affect the value of your investmentin the Fund:

● General Market Risk:  The market price of a security may fluctuate, sometimes rapidly and unpredictably.  These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.  Globally, financial markets continue to experience uncertainty and stress, which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual stocks.

● Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value.

● Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

● Foreign Securities and Emerging Markets Risk:  Foreign securities are subject to increased risks including political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets.  Investments in emerging markets are generally more volatile than investments in developed foreign markets.  Current political uncertainty surrounding the European Union and its membership could add to increased market volatility.  This situation has also raised a number of uncertainties regarding the stability and overall standing of the European Monetary Union.  Given the global effect of today’s economy, the volatility of the Euro may affect the risk of an investment in the Fund.

● Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

● Sustainability (ESG) Policy Risk:  The Fund’s ESG policy could cause the Fund to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is the risk that you could lose all or a portion of your investment in the International Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following performance information provides some indication of the risks of investing in the International Fund.  The bar chart below illustrates how the Fund’s total returns have varied from year-to-year.  The table below illustrates how the Fund’s average annual total returns for the 1-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the Funds’ website at http://www.bostoncommonfunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the International Fund. The bar chart below illustrates how the Fund's total returns have varied from year-to-year. The table below illustrates how the Fund's average annual total returns for the 1-year and since-inception periods compare with that of a broad-based securities index. This comparison is provided to offer a broader market perspective.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

http://www.bostoncommonfunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future and does not guarantee future results.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Return

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:	Q1, 2012	11.99%
Lowest Quarterly Return:	Q3, 2011	-19.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest quarterly return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.99%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest quarterly return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.11%)

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 does not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts ("IRAs").

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

The "Return After Taxes on Distributions and Sale of Fund Shares" may be higher than other figures because when a capital loss occurs upon redemption of Fund shares, a tax deduction is provided that benefits the investor.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).  The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other figures because when a capital loss occurs upon redemption of Fund shares, a tax deduction is provided that benefits the investor.

Caption

rr_AverageAnnualReturnCaption

Average Annual Total Returns as of December 31, 2012

MSCI EAFE Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.32%

Since Inception

rr_AverageAnnualReturnSinceInception

1.66%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2010

Boston Common International Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees

rr_ManagementFeesOverAssets

0.90%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.65%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.55%

Fee Reduction and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.34%)

Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.21%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

122

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

456

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

814

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,821

Annual Return 2011

rr_AnnualReturn2011

(12.89%)

Annual Return 2012

rr_AnnualReturn2012

13.98%

1 Year

rr_AverageAnnualReturnYear01

13.98%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.38%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2010

Boston Common International Fund | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.95%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.39%)

Boston Common International Fund | After Taxes on Distributions and Sales

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.34%

Since Inception

rr_AverageAnnualReturnSinceInception

(0.26%)

[1] Boston Common Asset Management, LLC ("Boston Common" or the "Adviser") has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement for the Fund (the "Expense Cap"). Prior to January 31, 2013, the Expense Cap was 1.35% of average daily net assets of the International Fund. Effective January 31, 2013, the Adviser has contractually reduced the Expense Cap to 1.20%. The Expense Cap is indefinite, but will remain in effect until at least January 31, 2014 and may be terminated at any time by the Trust's Board of Trustees (the "Board") upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the Fund toward operating expenses for the fiscal year (taking into account the reimbursement) does not exceed the Expense Cap.

XML

Boston Common International Fund | Boston Common International Fund

Boston Common International Fund

Investment Objective

The Boston Common International Fund (the “International Fund”) seeks long-term capital appreciation.

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 International Fund.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees	Boston Common International Fund
Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)	2.00%

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

Annual Fund Operating Expenses		Boston Common International Fund
Management Fees		0.90%
Distribution and Service (12b-1) Fees		none
Other Expenses		0.65%
Total Annual Fund Operating Expenses		1.55%
Fee Reduction and/or Expense Reimbursement		(0.34%)
Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement	[1]	1.21%

Example

This Example is intended to help you compare the cost of investing in the International Fund with the cost of investing in other mutual 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 contractual Expense Cap for the first year).

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Boston Common International Fund	122	456	814	1,821

Portfolio Turnover

The International 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 above example, affect the Fund’s performance.  During the most recent fiscal year, ended September 30, 2012, the Fund’s portfolio turnover rate was 33% of the average value of its portfolio.

Principal Investment Strategies

Boston Common seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent profitability over a long time horizon.  We include those companies in our portfolios that we believe are operating successfully in economic sectors with superior end-market growth, or are beneficiaries of broader sector themes we have identified, but that we judge to be trading at discounts to their intrinsic value.  We seek to integrate environmental, social, and governance (“ESG”) criteria into the stock selection process and express a preference for best-in-class firms with innovative approaches to the environmental and social challenges their industries, society, and the world face.  Best-in-class refers to firms that Boston Common views as having better records on ESG criteria than other firms in the same industry or sector.

Boston Common endeavors to integrate financial and sustainability factors into its investment process because we believe ESG research helps us identify companies that will be successful over the long-term.  We seek companies that can capitalize on new market opportunities, implement efficiency improvements and avoid unanticipated costs stemming from inadequate attention to ESG risks.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control. We may sell a security when its price reaches a set target, if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage company managements towards greater transparency, accountability, disclosure and commitment to ESG issues.

The International Fund will normally invest at least 80% of its net assets, including borrowings for investment purposes, in securities of non-U.S. companies.  The Fund may invest in common and preferred stocks as well as securities that are convertible into common stocks.  The Fund may also invest in ADRs, European Depositary Receipts (“EDRs”) and Global Depositary Receipts (“GDRs”).  Up to 20% of the Fund’s total assets may be invested in securities of companies located in emerging markets.  The Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

The International Fund will not change its investment policy of investing at least 80% of its net assets in equity securities of non-U.S. companies without first changing the Fund’s name and providing shareholders with at least 60 days’ prior written notice.

Principal Investment Risks

There is the risk that you could lose all or a portion of your investment in the International Fund.  The following riskscould affect the value of your investmentin the Fund:

● General Market Risk:  The market price of a security may fluctuate, sometimes rapidly and unpredictably.  These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.  Globally, financial markets continue to experience uncertainty and stress, which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual stocks.

● Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value.

● Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

● Foreign Securities and Emerging Markets Risk:  Foreign securities are subject to increased risks including political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets.  Investments in emerging markets are generally more volatile than investments in developed foreign markets.  Current political uncertainty surrounding the European Union and its membership could add to increased market volatility.  This situation has also raised a number of uncertainties regarding the stability and overall standing of the European Monetary Union.  Given the global effect of today’s economy, the volatility of the Euro may affect the risk of an investment in the Fund.

● Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

● Sustainability (ESG) Policy Risk:  The Fund’s ESG policy could cause the Fund to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

Performance

The following performance information provides some indication of the risks of investing in the International Fund.  The bar chart below illustrates how the Fund’s total returns have varied from year-to-year.  The table below illustrates how the Fund’s average annual total returns for the 1-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the Funds’ website at http://www.bostoncommonfunds.com.

Calendar Year Total Return

Highest Quarterly Return:	Q1, 2012	11.99%
Lowest Quarterly Return:	Q3, 2011	-19.11%

Average Annual Total Returns as of December 31, 2012

Average Annual Returns	1 Year	Since Inception	Inception Date
Boston Common International Fund	13.98%	(0.38%)	Dec. 29, 2010
Boston Common International Fund After Taxes on Distributions	13.95%	(0.39%)
Boston Common International Fund After Taxes on Distributions and Sales	9.34%	(0.26%)
Boston Common International Fund MSCI EAFE Index	17.32%	1.66%	Dec. 29, 2010

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).  The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other figures because when a capital loss occurs upon redemption of Fund shares, a tax deduction is provided that benefits the investor.

[1] Boston Common Asset Management, LLC ("Boston Common" or the "Adviser") has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement for the Fund (the "Expense Cap"). Prior to January 31, 2013, the Expense Cap was 1.35% of average daily net assets of the International Fund. Effective January 31, 2013, the Adviser has contractually reduced the Expense Cap to 1.20%. The Expense Cap is indefinite, but will remain in effect until at least January 31, 2014 and may be terminated at any time by the Trust's Board of Trustees (the "Board") upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the Fund toward operating expenses for the fiscal year (taking into account the reimbursement) does not exceed the Expense Cap.

XML

Document and Entity Information	0 Months Ended
	Sep. 30, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Sep. 30, 2012
Registrant Name	PROFESSIONALLY MANAGED PORTFOLIOS
Central Index Key	0000811030
Amendment Flag	false
Document Creation Date	Jan. 29, 2013
Document Effective Date	Jan. 31, 2013
Prospectus Date	Jan. 31, 2013
Boston Common International Fund | Boston Common International Fund | Boston Common International Fund
Risk/Return:
Trading Symbol	BCAIX
Boston Common U.S. Equity Fund | Boston Common U.S. Equity Fund | Boston Common U.S. Equity Fund
Risk/Return:
Trading Symbol	BCAMX

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Boston Common U.S. Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Boston Common U.S. Equity Fund (the “U.S. Equity Fund”) seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the U.S. Equity Fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)

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

2014-01-31

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The U.S. Equity 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 above example, affect the Fund’s performance.  Since the Fund’s inception on April 30, 2012, through the fiscal period ended September 30, 2012, the U.S. Equity Fund’s portfolio turnover rate was 10% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

10.00%

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 U.S. Equity Fund with the cost of investing in other mutual 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 contractual Expense Cap for the first year).

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Boston Common seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent profitability over a long time horizon.  We include those companies in our portfolios that we believe are operating successfully in economic sectors with superior end-market growth, or are beneficiaries of broader sector themes we have identified, but that we judge to be trading at discounts to their intrinsic value.  We seek to integrate environmental, social, and governance (“ESG”) criteria into the stock selection process and express a preference for best-in-class firms with innovative approaches to the environmental and social challenges their industries, society, and the world face.  Best-in-class refers to firms that Boston Common views as having better records on ESG criteria than other firms in the same industry or sector.

Boston Common endeavors to integrate financial and sustainability factors into its investment process because we believe ESG research helps us identify companies that will be successful over the long-term.   We seek companies that can capitalize on new market opportunities, implement efficiency improvements and avoid unanticipated costs stemming from inadequate attention to ESG risks.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control.  We may sell a security when its price reaches a set target, if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage company managements towards greater transparency, accountability, disclosure and commitment to ESG issues.

The U.S. Equity Fund will normally invest at least 80% of its net assets, including borrowings for investment purposes, in equity securities of U.S. companies.  Equity securities include common and preferred stocks as well as securities that are convertible into common stocks.  The Fund may also invest up to 20% of its total assets in ADRs.  The Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

The U.S. Equity Fund will not change its investment policy of investing at least 80% of its net assets in equity securities of U.S. companies without first changing the Fund’s name and providing shareholders with at least 60 days’ prior written notice.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund.  The following riskscould affect the value of your investmentin the Fund:

● General Market Risk:  The market price of a security may fluctuate, sometimes rapidly and unpredictably.  These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.  Globally, financial markets continue to experience uncertainty and stress, which has resulted in unusual and extreme volatility in the equity markets and in the prices of individual stocks.

● Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value.

● Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

● Foreign Securities Risk:  Foreign securities, including ADRs, are subject to increased risks including political and economic risks, greater volatility, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, and less stringent investor protection and disclosure standards of foreign markets.

● Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

● Sustainability (ESG) Policy Risk:  The Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

● New Fund Risk:  The Fund is new with a short operating history and there can be no assurance that the Fund will grow to or maintain an economically viable size.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

Because the U.S. Equity Fund recently commenced operations, it does not have a full calendar year of performance to compare against a broad measure of market performance.  Accordingly, performance information is not available.  Performance information will be available after the Fund has been in operation for one calendar year.  At that time, the performance information will provide some indication of the risks of investing in the Fund by comparing it against a broad measure of market performance.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

Because the U.S. Equity Fund recently commenced operations, it does not have a full calendar year of performance to compare against a broad measure of market performance. Accordingly, performance information is not available. Performance information will be available after the Fund has been in operation for one calendar year. At that time, the performance information will provide some indication of the risks of investing in the Fund by comparing it against a broad measure of market performance.

Boston Common U.S. Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

13.19%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

13.94%

Fee Reduction and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(12.94%)

Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.00%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

102

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,462

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

3,657

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

7,639

[1] The Adviser has contractually agreed to reduce its fees and/or pay Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement for the U.S. Equity Fund to 1.00% of average daily net assets (the "Expense Cap"). The Expense Cap is indefinite, but will remain in effect until at least January 31, 2014 and may be terminated at any time by the Board upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the Fund toward operating expenses for the fiscal year (taking into account the reimbursement) does not exceed the Expense Cap.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013