All but one of the 24 healthcare co-ops funded by a $2 billion Obamacare program intended to create public competition for private sector insurers failed to file required tax returns, according to a Washington Examiner survey.

The co-ops are required under federal law to file IRS Form 990 tax returns each year. The 990 is a public disclosure document that provides extensive financial information about the filing non-profit, including its sources of revenue, what it spends its funds on, and the compensation paid officers and key staff members.