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What ETF or other security tracks closest to 30 year mortgage rates?
Mortgage rates tend to track the yield on the 10-year Treasury note. The CBOE Interest Rate 10-Year T-Note, TNX, is a security directly related to this rate. Divide the CBOE price of TNX by 10 to get the yield.  One can also track the  10Y T-Note yield at yahoo finance using ticker symbol (^TNX).   One can also track the  10Y T-Note yield at yahoo finance using ticker symbol (^TNX).