AT&T SR NT 6.375 cannot be verified agains its exchange. It seems like ATamp;T is not available for investing. Please verify the symbol is currently traded on Over the Counter Bulletin Board. If you still believe the symbol you are trying to look up is valid please let us know and we will check it as soon as possible.
1 Month Beta ..........
0.0
Unless we do not have data at the moment the returns on S&P 500 and ATamp;T are completely uncorrelated
Pay attentionOverlapping area represents amount of risk that can be diversified away by holding AT&T SR NT 6.375 and equity matching GSPC index in the same portfolio
USA 
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