Castlight Health Inc., which sells technology to help large employers better manage their health care costs, has formally filed an S-1 registration statement with the Securities and Exchange Commission to conduct an initial public offering of stock.

The S-1 does not list the proposed price per share or the anticipated total size of the IPO. Castlight in early February filed a “confidential” document with the SEC that enables a company to receive non-public review and comment from the agency before finalizing a decision. At that time, Fortune reported the IPO could reach $2 billion.

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