At issue, administration officials say, was some telecommunications stock and some property in Greece that Tenet failed to report on his initial financial disclosure statement when he joined the Clinton Administration.

CNN: AllPolitics - Questions About Tenet

In a statement released in May 2012, CMS announced it would not require data capture to begin until at least January 1, 2013, which was a relief to many but very frustrating to Senator Charles Grassley, a major proponent of disclosure and a sponsor of the initial legislation.

FORBES: The Sunshine Act Is Finally Final

To determine the 2013 ranking, Corporate Knights trimmed down an initial list of 4, 000 publicly traded companies to 350, based on financial performance, sustainability disclosure practices, and other criteria.

FORBES: The World's Most Sustainable Companies