Thomas Fuller / SOPA Images / LightRocket via Getty Images Metsera shares skyrocketed after Pfizer agreed to purchase the biopharma firm Key Takeaways Pfizer said it would pay as much as $7.3 billion for Metsera as it looks to profit from soaring demand for weight-loss medicines. Metsera investors will get$47.50 per share for each share they own, plus up to an additional $22.50 per share if the biopharma's combination treatment for obesity meets certain thresholds. The news sent Metsera shares soari ...