William Blair downgraded Dynavax (DVAX) to Market Perform from Outperform after Sanofi (SNY) announced it will acquire the company for $15.50 per share. The firm, which believes the acquisition "makes sense" given growing regulatory concerns around vaccines and investor questions on management's strategy for value creation, calls Sanofi a "logical acquisition partner." Alliance Global downgraded Spire Global (SPIR) to Neutral from Buy with a price target of$9, down from $17, until there is more evidence o ...