Data quoted is past performance and current performance may be lower or higher. Past performance is no guarantee of future results. Investment return and principal value of an investment will fluctuate, and shares, when redeemed, may be worth more or less than their original cost.

Risk Factors: The value of the Fund's shares will change, and you could lose money on your investment. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Investing in companies involved in one specified sector may be more risky and volatile than an investment with greater diversification. International investing involves additional risks, including currency fluctuations, political or economic conditions affecting the foreign country, and differences in accounting standards and foreign regulations. These risks are magnified in emerging markets. Investing in natural resources can be riskier than other types of investment activities because of a range of factors, including price fluctuation caused by real and perceived inflationary trends and political developments; and the cost assumed by natural resource companies in complying with environmental and safety regulations. Investing in physical commodities, such as gold, exposes the fund to other risk considerations such as potentially severe price fluctuations over short periods of time. The Fund may use a range of derivative instruments in seeking to hedge market risk on equity securities, increase exposure to specific sectors or companies, and manage exposure to various foreign currencies and precious metals. Such hedging involves additional risks, as the fluctuations in the values of the derivatives may not correlate perfectly with the overall securities markets or with the underlying asset from which the derivative’s value is derived. These and other risks are more fully described in the prospectus. Not all funds or fund classes may be offered at all broker/ dealers.

Natural or environmental disasters, such as earthquakes, fires, floods, hurricanes, tsunamis, and other severe weather-related phenomena generally, and widespread disease, including pandemics and epidemics, have been and can be highly disruptive to economies and markets, adversely impacting individual companies, sectors, industries, markets, currencies, interest and inflation rates, credit ratings, investor sentiment, and other factors affecting the value of the Fund’s investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region are increasingly likely to adversely affect markets, issuers, and/or foreign exchange rates in other countries. These disruptions could prevent the Fund from executing advantageous investment decisions in a timely manner and could negatively impact the Fund’s ability to achieve its investment objective. Any such event(s) could have a significant adverse impact on the value and risk profile of the Fund.

Index Description: The S&P North American Natural Resources Sector Index represents U.S.-traded securities in the energy and materials sectors, excluding the chemicals industry, and steel sub-industry. It is not possible to invest directly in an index.

Performance results for some funds may include the effect of expense reduction arrangements. If those arrangements had not been in place, the performance results would have been lower.

Class N (formerly Class R6) will have no performance history as of 07/31/2014. Performance prior to that date is the Fund’s Class I share class performance restated to reflect the Class N total annual fund operating expenses as of 07/31/2014. Class N shares will have substantially similar returns to Class I share of the Fund, though returns will be different to the extent that expenses differ among the classes. Class N shares are only available to certain types of investors. Please see the Fund’s prospectus for additional information.

The Fund’s investment manager, Delaware Management Company (Manager), may permit its affiliates, Macquarie Investment Management Global Limited (MIMGL) and Macquarie Funds Management Hong Kong Limited, to execute Fund security trades on behalf of the Manager. The Manager may also seek quantitative support from MIMGL.

Fee waiver and/or Expense Reimbursement: Through July 31, 2021, Delaware Management Company (DMC), a series of Macquarie Investment Management Business Trust, the Fund’s investment manager, Delaware Distributors, L.P. (Distributor), the Fund’s distributor, and/or Waddell & Reed Services Company, doing business as WI Services Company (WISC), the Fund’s transfer agent, have contractually agreed to reimburse sufficient management fees, 12b-1 fees and/or shareholder servicing fees to cap the total annual ordinary fund operating expenses (which would exclude interest, taxes, brokerage commissions, acquired fund fees and expenses and extraordinary expenses, if any) as follows: Class E shares at 1.17%. Prior to that date, the expense limitation may not be terminated without the consent of the Board of Trustees (Board).

Fee waiver and/or Expense Reimbursement: Through July 31, 2021, Delaware Distributors, L.P. (Distributor) and/or WISC have contractually agreed to reimburse sufficient 12b-1 and/or shareholder servicing fees to ensure that the total annual ordinary fund operating expenses of the Class N shares and Class Y shares do not exceed the total annual ordinary fund operating expenses of the Class I shares and Class A shares, respectively, as calculated at the end of each month. Prior to that date, the expense limitation may not be terminated without the consent of the Board.

The Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) for Class A shares was revised downwards to 3.50%, effective Oct. 1, 2020. The low balance fee for Class A Shares of the Fund was eliminated and accounts will NOT be assessed an account fee of $20 if the account balance is below $650 at the start of business on the Friday prior to the last full week of September 2020 (i.e., September 18, 2020).

Pricing: All prices and year-to-date returns are based on closing quotes unless noted, as supplied to the NASDAQ by 6:00 p.m. Eastern time. YTD Prices can be updated 3 to 4 hours after the Daily Pricing information which can result in mismatching data.

Style Analysis: The Morningstar Style Box reveals a fund's investment style. For equity funds the vertical axis shows the market capitalization of the stocks owned and the horizontal axis shows investment style (value, blend, or growth). For fixed-income funds, the vertical axis shows the credit quality of the bonds owned and the horizontal axis shows interest rate sensitivity as measured by a bond's effective duration. Morningstar seeks credit rating information from fund companies on a periodic basis (e.g., quarterly). In compiling credit rating information, Morningstar instructs fund companies to only use ratings that have been assigned by the following Nationally Recognized Statistical Rating Organizations (NRSROs): Moody's, Standard & Poor's, Fitch, and Egan-Jones. If two NRSROs have rated a security, fund companies are to report the lowest rating; if three or more NRSROs have rated the same security differently, fund companies are to report the rating that is in the middle. For example, if NRSRO X rates a security AA-, NRSRO Y rates the same security an A and NRSRO Z rates it a BBB+, the fund company should use the credit rating of 'A' in its reporting to Morningstar. PLEASE NOTE: Morningstar, Inc. is not itself an NRSRO nor does it issue a credit rating on the fund. An NRSRO rating on a fixed-income security can change from time-to-time. For credit quality, Morningstar combines the credit rating information provided by the fund companies with an average default rate calculation to come up with a weighted-average credit quality. The weighted-average credit quality is currently a letter that roughly corresponds to the scale used by a leading NRSRO. Bond funds are assigned a style box placement of "low", "medium", or "high" based on their average credit quality. Funds with a low credit quality are those whose weighted-average credit quality is determined to be less than "BBB-"; medium are those less than "AA-", but greater or equal to "BBB-"; and high are those with a weighted-average credit quality of "AA-" or higher. When classifying a bond portfolio, Morningstar first maps the NRSRO credit ratings of the underlying holdings to their respective default rates (as determined by Morningstar's analysis of actual historical default rates). Morningstar then averages these default rates to determine the average default rate for the entire bond fund. Finally, Morningstar maps this average default rate to its corresponding credit rating along a convex curve. For interest-rate sensitivity, Morningstar obtains from fund companies the average effective duration. Generally, Morningstar classifies a fixed-income fund's interest-rate sensitivity based on the effective duration of the Morningstar Core Bond Index (MCBI), which is currently three years. The classification of Limited will be assigned to those funds whose average effective duration is between 25% to 75% of MCBI's average effective duration; funds whose average effective duration is between 75% to 125% of the MCBI will be classified as Moderate; and those that are at 125% or greater of the average effective duration of the MCBI will be classified as Extensive. For municipal bond funds, Morningstar also obtains from fund companies the average effective duration. In these cases static breakpoints are utilized. These breakpoints are as follows: (i) Limited: 4.5 years or less; (ii) Moderate: more than 4.5 years but less than 7 years; and (iii) Extensive: more than 7 years. In addition, for non-US taxable and non-US domiciled fixed income funds static duration breakpoints are used: (i) Limited: less than or equal to 3.5 years; (ii) Moderate: greater than 3.5 and less than equal to 6 years; (iii) Extensive: greater than 6 years.

Unsubsidized yields reflect what the yield would have been without the effect of reimbursements and waivers. The adviser and its affiliates have or may voluntarily waive a portion of their fees (including, but not limited to, distribution and service (12b-1) fees) and reimburse certain expenses. There is no guarantee that the fund will avoid a negative yield. Such undertaking may be amended or withdrawn at any time.

12-Month Trailing Distribution Yield: at NAV refers to the 12-month historical cash flow paid over the past 12 months in dividends, divided by the past months ending NAV.

Alpha, Beta, R-Squared, Standard Deviation, Sharpe Ratio and Capture Ratio are 5 year statistics. Alpha is a measure of a fund's actual returns and expected performance, given its level of risk (as measured by beta). Beta reflects the sensitivity of the fund's return to fluctuations in the market index. R-squared indicates how much of a fund's fluctuations were attributable to movements in the fund's benchmark. Standard deviation is a measure of how volatile a fund's returns are. Sharpe ratio is a measure of a fund's risk-adjusted performance. Capture ratio reflects the annualized product of fund vs. index returns for all months in which the index had a positive return (upside capture) or negative return (downside capture).

The Morningstar Rating™ for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds, and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance, and does not include the effects of sales charges. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods.

© 2021 Morningstar, Inc. All Rights Reserved. The information contained herein: (1) is proprietary to Morningstar; (2) may not be copied or distributed; and (3) is not warranted to be accurate, complete or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. Past performance is no guarantee of future results.

Information is subject to change and is not intended to represent any past or future investment recommendations.

Natural or environmental disasters, such as earthquakes, fires, floods, hurricanes, tsunamis, and other severe weather-related phenomena generally, and widespread disease, including pandemics and epidemics, have been and can be highly disruptive to economies and markets, adversely impacting individual companies, sectors, industries, markets, currencies, interest and inflation rates, credit ratings, investor sentiment, and other factors affecting the value of the Fund’s investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region are increasingly likely to adversely affect markets, issuers, and/or foreign exchange rates in other countries. These disruptions could prevent the Fund from executing advantageous investment decisions in a timely manner and could negatively impact the Fund’s ability to achieve its investment objective. Any such event(s) could have a significant adverse impact on the value and risk profile of the Fund.