Hynix Semiconductor, the world’s second-largest memory chipmaker, has won a one-point-two-billion-dollar antitrust lawsuit in the United States.

A San Francisco jury on Wednesday ruled that South Korean firm Hynix and U.S. chipmaker Micron Technology did not engage in joint illegal actions to block Rambus, the American firm that filed the suit, from expanding in the semiconductor market.

Rambus claimed that Hynix and Micron conspired to fix prices of memory chips which cost it roughly four billion U.S. dollars in lost profit.

With the ruling, Rambus saw its shares plunge by 61 percent, while Micron’s shares surged 23 percent.