Synopsys’ $35 billion acquisition of Ansys has finally closed, 18 months after the deal was first announced.

The completion comes in the same week China’s antitrust watchdog conditionally approved the deal, following in the footsteps of regulators in the US, UK, and EU.

The acquisition was approved after both companies agreed to sell off a number of their software offerings, with Synopsys offloading its Optical Solutions Group to Keysight in addition to transferring other optics and photonics software offerings, including Code V, LightTools, LucidShape, RSoft, and ImSym.

Meanwhile, Ansys agreed to sell its register-transfer-level power consumption analysis software, PowerArtist.

Following the closure of the deal, Synopsys president and CEO, Sassine Ghazi, said: “Today marks a transformational milestone for Synopsys. For decades, Synopsys has been delivering breakthroughs in silicon design and IP that have fueled chip innovation.

“The increasing complexity of developing intelligent systems demands design solutions with a deeper integration of electronics and physics, enhanced by AI. With Ansys’ leading system simulation and analysis solutions now part of Synopsys, we can maximize the capabilities of engineering teams broadly, igniting their innovation from silicon to systems.”