You and Zhang [2009] document that the market underreaction to 10-K filings is stronger for firms with longer 10-K filings. Feldman, Govindaraj, Liv nat, and Segal [2010] take the analysis one step further by exploring whether the information contained in the MD&A section of 10-Qs and 10-Ks is associated with stock price drifting. They classify words into positive and negative categories to measure the tone change in the MD&A section relative to prior periodic SEC filings. They find that tone change signals help predict the subsequent quarter's earnings surprise. Consistent with the hypothesis that the market under-reacts to this information, they show that management's tone change adds significantly to portfolio drift returns in the window of 2 days after the SEC filing date through 1 day after the subsequent quarter's preliminary earnings announcement, and that this drift is incremental to that implied by accruals and earnings surprises.