Summary Prospectus

June 14, 2017

Wells Fargo Index Fund

Class/Ticker: Class A - WFILX; Class C - WFINX

Link to Prospectus Link to SAI

Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus and other information about the Fund online at wellsfargofunds.com/reports. You can also get information at no cost by calling 1-800-222-8222, or by sending an email request to fundservice@wellsfargo.com. The current prospectus ("Prospectus") and statement of additional information ("SAI"), dated October 1, 2016, as supplemented from time to time, are incorporated by reference into this summary prospectus. The Fund's SAI may be obtained, free of charge, in the same manner as the Prospectus.

Investment Objective

The Fund seeks to replicate the total return of the S&P 500 Index, before fees and expenses.

Fees and Expenses

These tables are intended to help you understand the various costs and expenses you will pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the aggregate in specified classes of certain Wells Fargo Funds. More information about these and other discounts is available from your financial professional and in "Share Class Features" and "Reductions and Waivers of Sales Charges" on pages 51 and 52 of the Prospectus and "Additional Purchase and Redemption Information" on page 61 of the Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)
	Class A	Class C
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	None
Maximum deferred sales charge (load) (as a percentage of offering price)	None‌1	1.00%

1. Investments of $1 million or more are not subject to a front-end sales charge but generally will be subject to a deferred sales charge of 1.00% if redeemed within 18 months from the date of purchase.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)‌1
	Class A	Class C
Management Fees‌2	0.14%	0.14%
Distribution (12b-1) Fees	0.00%	0.75%
Other Expenses‌3	0.49%	0.49%
Total Annual Fund Operating Expenses	0.63%	1.38%
Fee Waivers	(0.18)%	(0.18)%
Total Annual Fund Operating Expenses After Fee Waiver‌4	0.45%	1.20%

1. Expenses have been adjusted as necessary from amounts incurred during the Fund's most recent fiscal year to reflect current fees and expenses.

2. Includes the fees charged by the Manager for providing advisory services to the master portfolio in which the Fund invests substantially all of its assets.

3. Includes other expenses allocated from the master portfolio in which the Fund invests.

4. The Manager has contractually committed through September 30, 2017, to waive fees and/or reimburse expenses to the extent necessary to cap the Fund's Total Annual Fund Operating Expenses After Fee Waiver at the amount shown above. Brokerage commissions, stamp duty fees, interest, taxes, acquired money market fund fees and expenses (if any), and extraordinary expenses are excluded from the cap. All other acquired fund fees from the underlying master portfolio(s) are included in the cap. After this time, the cap may be increased or the commitment to maintain the cap may be terminated only with the approval of the Board of Trustees.

Example of Expenses

The example below is intended to help you compare the costs of investing in the Fund with the costs of investing in other mutual funds. The example assumes a $10,000 initial investment, 5% annual total return, and that fees and expenses remain the same as in the tables above. To the extent that the Manager is waiving fees or reimbursing expenses, the example assumes that such waiver or reimbursement will only be in place through the date noted above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	Assuming Redemption at End of Period		Assuming No Redemption
After:	Class A	Class C	Class C
1 Year	$618	$222	$122
3 Years	$748	$419	$419
5 Years	$889	$738	$738
10 Years	$1,300	$1,642	$1,642

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, we invest:

• at least 80% of the Fund's net assets in a diversified portfolio of equity securities designed to replicate the holdings and weightings of the stocks comprising the S&P 500 Index.

The Fund is a gateway fund that invests substantially all of its assets in the Index Portfolio, a master portfolio with a substantially identical investment objective and substantially similar investment strategies. We invest in substantially all of the common stocks comprising the S&P 500 Index and attempt to achieve at least a 95% correlation between the performance of the S&P 500 Index and the Fund's investment results, before fees and expenses. This correlation is sought regardless of market conditions. If we are unable to achieve this correlation, then we will closely monitor the performance and composition of the S&P 500 Index and adjust the Fund's securities holdings as necessary to seek the correlation.

A precise duplication of the performance of the S&P 500 Index would mean that the net asset value ("NAV") of Fund shares, including dividends and capital gains, would increase or decrease in exact proportion to changes in the S&P 500 Index. Such a 100% correlation is not feasible. Our ability to track the performance of the S&P 500 Index may be affected by, among other things, transaction costs and shareholder purchases and redemptions. We continuously monitor the performance and composition of the S&P 500 Index and adjust the Fund's portfolio as necessary to reflect any changes to the S&P 500 Index and to maintain a 95% or better performance correlation before fees and expenses. Furthermore, we may use futures to manage risk or to enhance return.

Principal Investment Risks

An investment in the Fund may lose money, is not a deposit of Wells Fargo Bank, N.A. or its affiliates, is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency, and is primarily subject to the risks briefly summarized below.

Derivatives Risk. The use of derivatives, such as futures, options and swap agreements, can lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the portfolio manager believes it would be appropriate to do so, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.

Futures Contracts Risk. A Fund that uses futures contracts, which are a type of derivative, is subject to the risk of loss caused by unanticipated market movements. In addition, there may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes and there may at times not be a liquid secondary market for certain futures contracts.

Index Tracking Risk. A Fund may not achieve exact correlation between the performance of the Fund and the index it tracks due to factors such as transaction costs, shareholder purchases and redemptions and the timing of changes in the composition of the index. The Fund may invest in only a representative sample of the securities that comprise the index and may hold securities not included in the index, subjecting the Fund to increased tracking risk. Maintaining investments in securities regardless of market conditions or the investment merits of the securities in seeking to replicate an index's composition or performance could cause the Fund's returns to be lower than if the Fund employed an active strategy.

Management Risk. Investment decisions, techniques, analyses or models implemented by a Fund's manager or sub-adviser in seeking to achieve the Fund's investment objective may not produce the returns expected, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk. The values of, and/or the income generated by, securities held by a Fund may decline due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.

Performance

The following information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year. The Fund's average annual total returns are compared to the performance of one or more indices. Past performance before and after taxes is no guarantee of future results. Current month-end performance is available on the Fund's website at wellsfargofunds.com.

Calendar Year Total Returns for Class A as of 12/31 each year
(Returns do not reflect sales charges and would be lower if they did)

Highest Quarter: 2nd Quarter 2009	+15.81%
Lowest Quarter: 4th Quarter 2008	-22.04%
Year-to-date total return as of 6/30/2016 is +3.64%

Average Annual Total Returns for the periods ended 12/31/2015 (returns reflect applicable sales charges)
	Inception Date of Share Class	1 Year	5 Year	10 Year
Class A (before taxes)	11/4/1998	-4.94%	10.65%	6.12%
Class A (after taxes on distributions)	11/4/1998	-6.85%	9.55%	5.08%
Class A (after taxes on distributions and the sale of Fund Shares)	11/4/1998	-1.47%	8.42%	4.84%
Class C (before taxes)	4/30/1999	-0.89%	11.13%	5.95%
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)		1.38%	12.57%	7.31%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) Plans or Individual Retirement Accounts. After-tax returns are shown for only one class of shares. After-tax returns for any other class will vary.

Fund Management

Manager	Sub-Adviser	Portfolio Manager, Title/Managed Since
Wells Fargo Funds Management, LLC	Golden Capital Management, LLC	John R. Campbell, CFA, Portfolio Manager / 2013 David Neal, CFA, Portfolio Manager / 2013 Robert M. Wicentowski, Portfolio Manager / 2017

References to the investment activities of a gateway fund are intended to refer to the investment activities of the master portfolio(s) in which it invests.

Purchase and Sale of Fund Shares

In general, you can buy or sell shares of the Fund online or by mail, phone or wire on any day the New York Stock Exchange is open for regular trading. You also may buy and sell shares through a financial professional.

Minimum Investments	To Buy or Sell Shares
Minimum Initial Investment Regular Accounts: $1,000 IRAs, IRA Rollovers, Roth IRAs: $250 UGMA/UTMA Accounts: $50 Employer Sponsored Retirement Plans: No Minimum Minimum Additional Investment Regular Accounts, IRAs, IRA Rollovers, Roth IRAs: $100 UGMA/UTMA Accounts: $50 Employer Sponsored Retirement Plans: No Minimum	Mail: Wells Fargo Funds P.O. Box 8266 Boston, MA 02266-8266 Online: wellsfargofunds.com Phone or Wire: 1-800-222-8222 Contact your financial professional.

Tax Information

Any distributions you receive from the Fund may be taxable as ordinary income or capital gains, except when your investment is in an IRA, 401(k) or other tax advantaged investment plan. However, subsequent withdrawals from such a tax advantaged investment plan may be subject to federal income tax. You should consult your tax adviser about your specific tax situation.

Payments to Intermediaries

If you purchase a Fund through an intermediary, the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the intermediary and your financial professional to recommend the Fund over another investment. Consult your financial professional or visit your intermediary's website for more information.

Link to Prospectus Link to SAI

Summary Prospectus

June 14, 2017

Wells Fargo Index Fund

Class/Ticker: Administrator Class - WFIOX

Link to Prospectus Link to SAI

Before you invest, you may want to review the Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's prospectus and other information about the Fund online at wellsfargofunds.com/reports. You can also get information at no cost by calling 1-800-222-8222, or by sending an email request to fundservice@wellsfargo.com. The current prospectus ("Prospectus") and statement of additional information ("SAI"), dated October 1, 2016, as supplemented from time to time, are incorporated by reference into this summary prospectus. The Fund's SAI may be obtained, free of charge, in the same manner as the Prospectus.

Investment Objective

The Fund seeks to replicate the total return of the S&P 500 Index, before fees and expenses.

Fees and Expenses

These tables are intended to help you understand the various costs and expenses you will pay if you buy and hold shares of the Fund.

Shareholder Fees (fees paid directly from your investment)
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None
Maximum deferred sales charge (load) (as a percentage of offering price)	None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management Fees‌1	0.14%
Distribution (12b-1) Fees	0.00%
Other Expenses‌2	0.26%
Total Annual Fund Operating Expenses	0.40%
Fee Waivers	(0.15)%
Total Annual Fund Operating Expenses After Fee Waiver‌3	0.25%

1. Includes the fees charged by the Manager for providing advisory services to the master portfolio in which the Fund invests substantially all of its assets.

2. Includes other expenses allocated from the master portfolio in which the Fund invests.

3. The Manager has contractually committed through September 30, 2017, to waive fees and/or reimburse expenses to the extent necessary to cap the Fund's Total Annual Fund Operating Expenses After Fee Waiver at the amount shown above. Brokerage commissions, stamp duty fees, interest, taxes, acquired money market fund fees and expenses (if any), and extraordinary expenses are excluded from the cap. All other acquired fund fees from the underlying master portfolio(s) are included in the cap. After this time, the cap may be increased or the commitment to maintain the cap may be terminated only with the approval of the Board of Trustees.

Example of Expenses

The example below is intended to help you compare the costs of investing in the Fund with the costs of investing in other mutual funds. The example assumes a $10,000 initial investment, 5% annual total return, and that fees and expenses remain the same as in the tables above. To the extent that the Manager is waiving fees or reimbursing expenses, the example assumes that such waiver or reimbursement will only be in place through the date noted above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

After:
1 Year	$26
3 Years	$113
5 Years	$209
10 Years	$491

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, we invest:

• at least 80% of the Fund's net assets in a diversified portfolio of equity securities designed to replicate the holdings and weightings of the stocks comprising the S&P 500 Index.

The Fund is a gateway fund that invests substantially all of its assets in the Index Portfolio, a master portfolio with a substantially identical investment objective and substantially similar investment strategies. We invest in substantially all of the common stocks comprising the S&P 500 Index and attempt to achieve at least a 95% correlation between the performance of the S&P 500 Index and the Fund's investment results, before fees and expenses. This correlation is sought regardless of market conditions. If we are unable to achieve this correlation, then we will closely monitor the performance and composition of the S&P 500 Index and adjust the Fund's securities holdings as necessary to seek the correlation.

A precise duplication of the performance of the S&P 500 Index would mean that the net asset value ("NAV") of Fund shares, including dividends and capital gains, would increase or decrease in exact proportion to changes in the S&P 500 Index. Such a 100% correlation is not feasible. Our ability to track the performance of the S&P 500 Index may be affected by, among other things, transaction costs and shareholder purchases and redemptions. We continuously monitor the performance and composition of the S&P 500 Index and adjust the Fund's portfolio as necessary to reflect any changes to the S&P 500 Index and to maintain a 95% or better performance correlation before fees and expenses. Furthermore, we may use futures to manage risk or to enhance return.

Principal Investment Risks

An investment in the Fund may lose money, is not a deposit of Wells Fargo Bank, N.A. or its affiliates, is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency, and is primarily subject to the risks briefly summarized below.

Derivatives Risk. The use of derivatives, such as futures, options and swap agreements, can lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the portfolio manager believes it would be appropriate to do so, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.

Futures Contracts Risk. A Fund that uses futures contracts, which are a type of derivative, is subject to the risk of loss caused by unanticipated market movements. In addition, there may at times be an imperfect correlation between the movement in the prices of futures contracts and the value of their underlying instruments or indexes and there may at times not be a liquid secondary market for certain futures contracts.

Index Tracking Risk. A Fund may not achieve exact correlation between the performance of the Fund and the index it tracks due to factors such as transaction costs, shareholder purchases and redemptions and the timing of changes in the composition of the index. The Fund may invest in only a representative sample of the securities that comprise the index and may hold securities not included in the index, subjecting the Fund to increased tracking risk. Maintaining investments in securities regardless of market conditions or the investment merits of the securities in seeking to replicate an index's composition or performance could cause the Fund's returns to be lower than if the Fund employed an active strategy.

Management Risk. Investment decisions, techniques, analyses or models implemented by a Fund's manager or sub-adviser in seeking to achieve the Fund's investment objective may not produce the returns expected, may cause the Fund's shares to lose value or may cause the Fund to underperform other funds with similar investment objectives.

Market Risk. The values of, and/or the income generated by, securities held by a Fund may decline due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.

Performance

The following information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year. The Fund's average annual total returns are compared to the performance of one or more indices. Past performance before and after taxes is no guarantee of future results. Current month-end performance is available on the Fund's website at wellsfargofunds.com.

Calendar Year Total Returns as of 12/31 each year
Administrator Class

Highest Quarter: 2nd Quarter 2009	+15.89%
Lowest Quarter: 4th Quarter 2008	-22.02%
Year-to-date total return as of 6/30/2016 is +3.73%

Average Annual Total Returns for the periods ended 12/31/2015
	Inception Date of Share Class	1 Year	5 Year	10 Year
Administrator Class (before taxes)	2/14/1985	1.16%	12.31%	7.05%
Administrator Class (after taxes on distributions)	2/14/1985	-0.94%	11.13%	5.95%
Administrator Class (after taxes on distributions and the sale of Fund Shares)	2/14/1985	2.08%	9.79%	5.62%
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)		1.38%	12.57%	7.31%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) Plans or Individual Retirement Accounts.

Fund Management

Manager	Sub-Adviser	Portfolio Manager, Title/Managed Since
Wells Fargo Funds Management, LLC	Golden Capital Management, LLC	John R. Campbell, CFA, Portfolio Manager / 2013 David Neal, CFA, Portfolio Manager / 2013 Robert M. Wicentowski, Portfolio Manager / 2017

References to the investment activities of a gateway fund are intended to refer to the investment activities of the master portfolio(s) in which it invests.

Purchase and Sale of Fund Shares

Administrator Class shares are generally available through intermediaries for the accounts of their customers and directly to institutional investors and individuals. Institutional investors may include corporations; private banks and trust companies; endowments and foundations; defined contribution, defined benefit and other employer sponsored retirement plans; institutional retirement plan platforms; insurance companies; registered investment advisor firms; bank trusts; 529 college savings plans; family offices; and fund of funds including those managed by Funds Management. In general, you can buy or sell shares of the Fund online or by mail, phone or wire on any day the New York Stock Exchange is open for regular trading. You also may buy and sell shares through a financial professional.

Minimum Investments	To Buy or Sell Shares
Minimum Initial Investment Administrator Class: $1 million (this amount may be reduced or eliminated for certain eligible investors) Minimum Additional Investment Administrator Class: None	Mail: Wells Fargo Funds P.O. Box 8266 Boston, MA 02266-8266 Online: wellsfargofunds.com Phone or Wire: 1-800-222-8222 Contact your financial professional.

Tax Information

Any distributions you receive from the Fund may be taxable as ordinary income or capital gains, except when your investment is in an IRA, 401(k) or other tax advantaged investment plan. However, subsequent withdrawals from such a tax advantaged investment plan may be subject to federal income tax. You should consult your tax adviser about your specific tax situation.

Payments to Intermediaries

If you purchase a Fund through an intermediary, the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the intermediary and your financial professional to recommend the Fund over another investment. Consult your financial professional or visit your intermediary's website for more information.

Link to Prospectus Link to SAI