Overall, the agency found that the majority of CEOs and CFOs filed statements certifying the material accuracy and completeness of their companies' prior disclosure reports.

However, 16 companies did not certify their reports by the deadline and instead filed explanations or other forms of certification, which are posted on the SEC's Web site.Those companies are:

Adams Resources & Energy, Inc.
Adelphia Communications Corporation
ACT Manufacturing Inc.
Alaska Air Group, Inc.
CMS Energy Corp.
Consolidated Freightways Corp.
Dynegy Inc.
Enron Corp.
Gemstar-TV Guide International Inc.
Hercules Inc.
The LTV Corporation
McLeodUSA Incorporated
Mirant Corporation
Qwest Communications Intl Inc.
TruServ Corporation
WorldCom Inc.

SEC chairman Harvey Pitt said the "certification procedures ... had the desired effect. We wanted assurances that senior corporate executives are taking personal responsibility for their companies' filings and personally stand behind the accuracy of their companies' reported numbers."

The statements were required under a June 27 Commission order to the CEOs and CFOs of U.S. based companies that reported more than $1.2 billion in revenue in their most recent fiscal year.