NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the sale of Metsera, Inc. (NASDAQ: MTSR) to Pfizer Inc. is fair to Metsera shareholders. Under the terms of the proposed transaction, Metsera shareholders will receive $47.50 per share in cash at closing, plus a non-transferable contingent value right entitling holders to potential additional payments of up to$22.50 per share in cash tied to three specific clinical and regulatory milestones. Halp. ...