The Russell 1000® Growth Index measures the performance of those Russell 1000 companies with higher price-to-book ratios and higher forecasted growth values. All investments carry risk, including the possible loss of principal and there is no assurance that an investment will provide positive performance over any period of time. Growth style investing may fall out of favor and underperform other equity investments during given periods. Certain sectors or growth stocks may shift characteristics over a long market cycle and may not perform in line with stated benchmarks.