Follow-on roundup: ImmunoGen, Mirati, Zymeworks, Viking, OptiNose

ImmunoGen Inc. (NASDAQ:IMGN), Mirati Therapeutics Inc. (NASDAQ:MRTX), Zymeworks Inc. (NYSE:ZYME; TSX:ZYME), Viking Therapeutics Inc. (NASDAQ:VKTX) and OptiNose Inc. (NASDAQ:OPTN) each priced follow-ons, raising a total of more than $465 million.

ImmunoGen raised $150.7 million through the sale of 13.7 million shares at $11

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