The Dow Jones Transportation Index typically moves with the Dow Jones and S&P500 indices. There have been periods in the past when the Transportation Index lagged behind other indices, ultimately resulting in a decline of major stock indices. The most recent lag period occurred between October 2019 and January 2020 prior to a significant decline going into March 2020. The charts below currently show a significant Transportation Index lag relative to the Dow Jones and S&P500 indices. A decline is still expected.
Stock charts courtesy of StockCharts.com.
