U.S. Credit Spreads – Baa-AAA 1919-2015 – US 30-year corporate bond yields
IPO – Data Counts and Eliminations – 1998-2013 – US IPO Activity
FRED – Federal Reserve Data: Economic time series
FINRA – Bonds (Treasury/Agency, Corp, Muni), Company (Morningstar) profiles, options, ratios, equity
SIFMA – Issuance, trading, and outstanding data for equities, bonds, derivatives, etc.
Yahoo! – IPO calendar and data
Yahoo! – Stock splits data
Yahoo! – Stock earnings surprises