How Much Alpha Is in Preliminary Data?
Illuminating the Differences between Prelim and Final Filings
“In theory there is no difference between theory and practice. In practice there is.”
-Yogi Berra
Companies often report financials twice: first, through a preliminary press release and again in their official, i.e., final, SEC filings. In theory, there should be no difference between the numbers reported in a company’s preliminary financial filings and their final filings with the SEC. In practice, often significant difference can occur between the preliminary and final filings. In this month’s research report, we focus on these observed differences within the S&P Capital IQ Point-In-Time database in order to ascertain the nature and exploitability of these differences. We find that:

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