Revisiting Mutual Fund Portfolio Disclosure
研究发现CRSP和Thomson数据库包含许多未在SEC备案中自愿披露的基金组合，同时也缺失SEC强制要求披露的组合；自愿披露多出于便利而非欺骗，且使用SEC或Thomson数据得出的实证结论相似，但CRSP在2008年前持仓信息不准确。
We document that CRSP and Thomson contain many voluntarily reported mutual fund portfolios that are not in SEC filings while, additionally, CRSP and Thomson are missing many SEC mandated portfolios available in SEC filings. We document that the voluntary disclosures are likely driven by convenience rather than duplicity. Although mandated portfolios contain securities with more return momentum, we find use of SEC or Thomson data lead to similar empirical findings. CRSP, however, contains inaccurate position information prior to 2008. Our findings have important implications, such as highlighting a 35% increase in observed manager trading by combining data sources. Received March 13, 2014; accepted February 28, 2016 by Editor Laura Starks.