Reports that chipmaker Broadcom is nearing a $15 billion deal to buy software company Symantec are making waves.

Symantec share are up 18% in premarket trading. Broadcom’s stock, meanwhile, is 4% lower.

The acquisition would follow Broadcom’s failed efforts to acquire fellow chipmaker Qualcomm in 2018. That deal was blocked by Trump, who cited national security concerns.

Broadcom has been on a buying spree since then. It bought another software company, CA Technologies, for $18.9 billion last year.