SOX and Going-Private Decisions

In my paper Going-Private Decisions and the Sarbanes-Oxley Act of 2002: A Cross-Country Analysis, which was co-written with Pinar Karaca-Mandic and Eric Talley and is forthcoming in the Journal of Law, Economics, & Organization, we investigate whether the passage and the implementation of the Sarbanes-Oxley Act of 2002 (SOX) drove firms out of the public capital market.

Many other attempts to address this question have had difficulty controlling for unobserved conflating factors that could have affected exit decisions around the enactment of SOX. We address this difficulty using a difference-in-differences empirical strategy. This approach compares changes over time in two populations: one subject to a policy intervention (treatment group) and the other not (control group). To evaluate the impact of the intervention on outcome, one needs to compare the outcome change for the treatment group with the outcome change for the control group. Assuming the two groups are similar in all relevant respects other than their exposure to the intervention, this approach screens out changes not related to the intervention. The primary outcome variable in our analysis is a public target’s probability of being bought by a private acquirer rather than a public one, the treatment group is American targets, and the control group is foreign targets. To evaluate the effect of SOX, we compare the change in the propensity of American public targets to be bought by private acquirers rather than by public acquirers to the corresponding change for foreign public targets. The difference between the two changes—the difference-in-differences—is the change we attribute to SOX.

When we examine acquisitions as a whole, we find no relative increase in the rate of acquisition by private acquirers (going private) among American firms. When we differentiate between acquisitions based on firm size, however, we find a relative increase in the rate of going private by small American firms. Moreover, when we differentiate between acquisitions based on their proximity to the enactment of SOX, we find a relative increase in the rate of going private by American firms in the first year after the enactment. Finally, when we differentiate between acquisitions based on both firm size and the proximity of the acquisition to the enactment of SOX, we find that the increase in the rate of going private by small American firms is concentrated in the first year after the enactment.

The full paper is available for download here.