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The ability to find closely correlated positions to O I could be a great tool in your tax-loss harvesting strategies, allowing investors a quick way to find a similar-enough asset to replace O I when you sell it. If you don't do this, your portfolio allocation will be skewed against your target asset allocation. So, investors can't just sell and buy back O I - that would be a violation of the tax code under the "wash sale" rule, and this is why you need to find a similar enough asset and use the proceeds from selling O I Glass to buy it.

The correlation of O I is a statistical measure of how it moves in relation to other instruments. This measure is expressed in what is known as the correlation coefficient, which ranges between -1 and +1. A perfect positive correlation (i.e., a correlation coefficient of +1) implies that as O I moves, either up or down, the other security will move in the same direction. Alternatively, perfect negative correlation means that if O I Glass moves in either direction, the perfectly negatively correlated security will move in the opposite direction. If the correlation is 0, the equities are not correlated; they are entirely random. A correlation greater than 0.8 is generally described as strong, whereas a correlation less than 0.5 is generally considered weak.