The S&P National AMT-Free Municipal Bond Index is a broad, comprehensive, market value-weighted index designed to measure the performance of the investment-grade tax-exempt U.S. municipal bond market.Bonds issued by U.S. territories, including Puerto Rico, are excluded from this index.
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The S&P Municipal Bond Index is a broad, market value-weighted index that seeks to measure the performance of the U.S. municipal bond market.
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The S&P National AMT-Free Municipal VRDO Index seeks to measure the performance of municipal investment grade, variable rate demand obligations.
|iShares National Muni Bond ETF||ETF|
|Vanguard Tax-Exempt Bond ETF||ETF|