Nvidia, the company whose chips power much of the artificial intelligence boom, is having a rough stretch on Wall Street as competitors push their own custom AI processors.

The picture shifted over the course of the week. Earlier reports from MSN noted Nvidia stock was actually rising on Thursday even as rivals announced custom AI chips. By Friday, the mood had changed. According to MSN, Nvidia stock continued a weeklong slide, dragging the Philadelphia semiconductor index lower in a broader tech sell-off.

FXLeaders reported that Nvidia's shares broke below $200 as "AI hype gives way to valuation concern," and in a separate note said the stock dropped 1.6% as an "AI-chip rotation" tested a key support level. In other words, some investors appear to be rethinking how much they should pay for AI-linked stocks and shifting money around within the sector.

The pressure isn't Nvidia's alone. According to Invezz, the entire semiconductor complex is under strain from a reassessment of AI valuations. Invezz also noted a potential silver lining: that selling can create "oversold" conditions, raising the chance of a broad rebound if markets stabilize.

Two forces are colliding here. First, competition: rivals are designing their own custom chips, chipping away at the idea that Nvidia is the only game in town. Second, valuation: after a historic run-up, investors are questioning whether AI stock prices have outpaced reality.

Why it matters: Nvidia has become a bellwether for the entire AI trade, so when its stock wobbles on competition and valuation fears, it signals that the market's confidence in the AI boom itself may be cooling.