'Scandal's Statistical Companion - Quantitative Efficiency in $91 Billion of 10b-18 Corporate Stock Buybacks - Performance vs. Efficiency

14 Pages Posted: 31 Oct 2006

Date Written: October 29, 2006

Abstract

The typical NASDAQ company in a small sample that executed $91 billion of stock buybacks in the 2004 - 2006 period (about 10% of all repurchases) paid 1.52% in excess costs relative to a naïve strategy of investing a constant dollar amount at VWAP (volume weighted average price) every month.

Results company by company did not cluster particularly close to the expected 0.00% efficiency cost: 63% of sampled companies suffered efficiency losses on average of 4.05% apiece relative to the "naïve" strategy, and their excess trading losses totaled $1.031 billion; 37% of companies outperformed the "naïve" strategy on average by 2.70% apiece, and their excess trading gains totaled $565 million.

A large proportion of companies at periods of peak activity accounted for in excess of 10% of monthly trading volume. One company's peak trading accounted for in excess of 15% of monthly volume, and that company also reported the best efficiency in its volume and timing decisions by beating the "naïve" strategy by 4.63% over the period.

A highly tentative look at performance suggests that, in addition to poor execution efficiency, corporations' buybacks may not be generating reasonable performance returns.

Keywords: stock buyback, buyback, VWAP, repurchase, corporate governance, 10B-18, 10B5-1, backdating, options scandal, perfect payday, gumport, Cashless Buyback, MG Holdings/SIP, SEC enforcement, Scandal

Suggested Citation

Gumport, Michael A., 'Scandal's Statistical Companion - Quantitative Efficiency in $91 Billion of 10b-18 Corporate Stock Buybacks - Performance vs. Efficiency (October 29, 2006). Available at SSRN: https://ssrn.com/abstract=941028 or http://dx.doi.org/10.2139/ssrn.941028

Michael A. Gumport (Contact Author)

MG Holdings/SIP ( email )

Summit, NJ 07901
United States

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