After-hours movers: Alpine Immune Sciences, Costco, and more

After-Hours Stock Movers:

Alpine Immune Sciences (NASDAQ: ALPN) climbed 36%, adding to earlier gains, after it announced an agreement to be acquired by Vertex Pharma (NASDAQ: VRTX) for $65 per share. Vertex declined 1%.

Costco (NASDAQ: COST) climbed 0.8% after it reported March sales and raised its dividend. Total comps were up 7.7%.

Crown Castle (NYSE: CCI) rose 0.3% after it named a new President and CEO, industry veteran Steven J. Moskowitz.

Ashland (NYSE: ASH) rose 1% after it was upgraded to 'overweight' by analysts at Wells Fargo.

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