The AI infrastructure buildout just found its next gear, and the companies making the unsexy-but-essential power chips are reaping the rewards. Wolfspeed, STMicroelectronics, and onsemi all surged on Monday as signals from Nvidia’s Vera Rubin platform ramp pointed to a wave of new demand for advanced power semiconductors.
Vera Rubin, Nvidia’s successor to the Blackwell architecture, officially entered full production ramp on May 31. The platform pairs Rubin GPUs built on TSMC’s 3nm process with Vera CPUs, targeting AI supercomputers that require power delivery systems far beyond what conventional silicon can efficiently handle.
Why power semis are the real story
SiC devices handle power conversion more efficiently than traditional silicon, generating less heat and wasting less energy. Nvidia’s Vera Rubin platform incorporates 800VDC power architecture for AI-scale deployments. That specification alone signals a meaningful shift toward higher-power density solutions in data centers, which directly benefits manufacturers of wide-bandgap power electronics.
Wolfspeed, STMicroelectronics, and onsemi are three of the most prominent players in this space. Each company produces SiC wafers, devices, or modules used in the kind of high-efficiency power systems that next-generation AI infrastructure demands.
Wolfspeed’s second act
Wolfspeed’s rally carries extra narrative weight. The Durham, North Carolina-based company emerged from Chapter 11 restructuring in September 2025 after a period that tested investor patience considerably. The company had bet heavily on SiC capacity expansion for electric vehicles, only to watch EV adoption timelines stretch and cash reserves thin.
Coming out of bankruptcy with a leaner balance sheet, Wolfspeed has repositioned itself to capture SiC demand from AI data centers, not just automotive. STMicroelectronics and onsemi, meanwhile, didn’t need a restructuring to be in position. Both companies have invested steadily in SiC manufacturing capacity over the past several years, with STMicro operating one of Europe’s largest SiC fabs and onsemi expanding its own production footprint in the US and South Korea.
The Vera Rubin supply chain effect
Nvidia shared additional details about Vera Rubin’s system partners at the ISC High Performance conference in June 2026. Those updates appear to have further catalyzed buying interest in power semiconductor names, as investors mapped out which companies sit in the platform’s supply chain.
The NVL72, one of the high-performance computing configurations within the Vera Rubin ecosystem, represents the kind of dense, power-hungry system that makes SiC adoption essentially non-negotiable.
The risk side is equally clear. SiC manufacturing remains expensive and technically challenging. Wolfspeed’s bankruptcy was a reminder that building capacity ahead of demand can go wrong. And competitive dynamics within the SiC market are intensifying, with Chinese manufacturers ramping their own production and potentially pressuring margins for Western suppliers over time.