As it waits on regulators for clearance to begin a phase IIa trial of its flagship hepatitis B treatment ARC-520, Arrowhead Research is preparing to name two additional clinical candidates, with one unveiled around the end of the second quarter, companies officials said this week.

Also this week, Arrowhead filed a shelf registration to sell as much as $200 million in common stock, preferred stock, and/or warrants, which President and CEO Christopher Anzalone said would give the company the ability to fully develop ARC-520 with or without a partner.

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