SAN FRANCISCO (AP) — Popular Internet radio service Pandora is tuning up for an IPO later this year.

The company outlined its plans for an initial public offering of stock in a Friday filing with securities regulators.

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The documents indicated Pandora will seek to raise $100 million, although that figure can change as bankers gauge investor demand.

A target price for the shares won’t be set until the IPO is closer to happening. The offering probably won’t happen for at least three months.

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Pandora Media Inc. started streaming songs over the Internet in 2005. It now has 80 million registered users in the U.S.

The company, based in Oakland, remains unprofitable. It lost $328,000 on revenue of $90 million in the first nine months of its last fiscal year.

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