Option Adjusted Duration is a measure of the potential responsiveness of a bond or portfolio price to parallel shifts in interest rates.

After Tax Post-Liq.(%): After-Tax Post-Liquidation Returns measure the performance of the fund after accounting for both taxes on distributions and the taxes incurred from selling the fund shares. This metric provides a comprehensive view of the investment’s tax impact, including the realization of capital gains or losses upon the sale. The highest marginal Federal tax rate is assumed.

After Tax Pre-Liq.(%): After-Tax Pre-Liquidation Returns refer to the performance of the fund after considering the impact of taxes on distributions, but before any action to sell the fund shares is taken. This measure provides investors with insight into how taxes affect their returns without factoring in the potential taxes from selling the investment, thus focusing solely on the tax implications of the fund’s income and capital gains distributions. The highest marginal Federal tax rate is assumed.

After-tax yield: The after-tax yield is the return that investors can expect to receive after accounting for taxes owed on the interest income generated by the bond. This yield is particularly important when comparing the returns on municipal bonds, which are often exempt from federal income tax (and sometimes state and local taxes if the bond is issued within the investor’s state of residence), with those on taxable bonds, like corporate or government bonds.

Tax Equivalent Yield: The tax-equivalent yield (TEY) is the yield that a taxable bond would need to equal the yield on a comparable tax-exempt municipal bond, taking into account the impact of taxes. The calculation is a tool that investors can use to fairly compare the yield between a tax-free investment and a taxable alternative. TEY assumes the highest marginal Federal tax rate, is measured at the individual bond level, and aggregated to the portfolio level.

Tax Equivalent Yield = Tax Free Municipal Bond Yield / (1-Tax Rate)

Effective duration: Effective duration is a way to measure interest-rate sensitivity for bonds that have embedded options, such as callable or puttable features. Effective duration captures the potential variations in cash flows due to these options, and can be measured using modified duration for option-free bonds. The calculation is measured at the individual bond level and then aggregated to the portfolio level.

The 30-Day SEC Yield represents net investment income earned by the fund over the 30-Day period, expressed as an annual percent age rate based on the fund’s share price at the end of the 30-Day period.

Option Adjusted Duration is a measure of the potential responsiveness of a bond or portfolio price to parallel shifts in interest rates.

The values shown are based off of a price provided by the Fund’s third-party index provider, using the bid price for each security (the “index price”). Because the Fund values its securities at the midpoint between the bid and ask prices for most securities, the index price is not necessarily the price at which the Fund values the portfolio holding for the purposes of determining its net asset value (the “valuation price”). The values shown may have been different if the valuation price were to have been used to calculate such values. The index price is as of the most recent date for which a price is available, and may not necessarily be as of the date shown above.

Option Adjusted Spread (OAS): For a bond, the option-adjusted spread is the measurement of the spread between the bond and the underlying government yield curve. For an Index, the average of its constituent security government option-adjusted spreads, weighted by full market value. 

The values shown are based off of a price provided by the Fund’s third-party index provider, using the bid price for each security (the “index price”). Because the Fund values its securities at the midpoint between the bid and ask prices for most securities, the index price is not necessarily the price at which the Fund values the portfolio holding for the purposes of determining its net asset value (the “valuation price”). The values shown may have been different if the valuation price were to have been used to calculate such values. The index price is as of the most recent date for which a price is available, and may not necessarily be as of the date shown above.