Meta description: Semiconductor stocks staged their biggest rally since April 2025 as dip buyers returned, betting the AI trade that powered the bull market still has room to run. Here's what changed.
After more than a week of relentless selling that dragged the Nasdaq 100 into a technical correction, chip stocks finally staged a dramatic reversal. A closely watched gauge of semiconductor giants climbed the most since April 2025 on Thursday, as dip buyers emerged on speculation that the artificial intelligence trade powering this year's bull market "has more room to run."
From five straight losing sessions to a full reversal
The turnaround is striking given what preceded it. As covered in our recent posts, the Philadelphia Semiconductor Index had just recorded its fifth consecutive session of losses on Wednesday, with names like Micron Technology tumbling nearly 10% in a single day amid concerns over AI infrastructure "circular financing" and rising competitive pressure from cheaper models overseas. Thursday's reversal didn't just stop that bleeding — it delivered the sector's best single-day performance in over a year.
Microsoft lit the fuse
The catalyst traced directly back to Microsoft's earnings, covered in detail in our companion post on the company's record $450 billion single-day gain. Azure's growth acceleration, paired with capex that landed right on guidance, gave the market concrete evidence that enterprise AI demand remains genuinely strong — exactly the kind of proof point chip investors had been waiting for after weeks of "circular financing" anxiety cast doubt on whether AI infrastructure spending would translate into durable returns.
Amazon added more fuel
Amazon's earnings, reported the same evening and covered in our companion post, reinforced the same message. The company explicitly said both its AI and custom chip businesses were rapidly gaining momentum, and AWS's 36.7% growth — its fastest in 18 quarters — gave investors a second major data point supporting the case that AI infrastructure investment is paying off, not just accumulating as unproductive capital spending.
A market that flipped its own narrative overnight
What makes Thursday's rally notable is how directly it reversed the dominant story of the past two weeks. Concerns over AI circular financing, competitive threats from cheaper Chinese models, and capex-driven cash flow pressure had combined to push chip stocks into one of their worst multi-week stretches in years. A single night of megacap earnings — Microsoft's disciplined capex and accelerating growth, Amazon's AI momentum commentary — was enough to flip sentiment sharply in the opposite direction, underscoring just how sensitive this sector has become to headline-driving data points.
The Asia connection
The rebound carries particular significance for markets we've been tracking closely, including South Korea's Kospi, which had tumbled over 10% earlier in the week as SK Hynix and Samsung Electronics dropped sharply on the same circular-financing concerns. With US chip sentiment reversing so decisively, Asian markets were positioned to extend the rally into Friday's session (more in our companion post on the global market reaction).
A word of caution before calling this a durable turn
One extraordinary trading day doesn't erase weeks of accumulated skepticism about AI infrastructure spending. The same structural questions that drove the recent selloff — sustainability of "circular financing" arrangements, competitive pressure from cheaper alternatives, and the sheer scale of ongoing capital expenditure — remain unresolved even after Thursday's rally. Investors should treat this as a meaningful data point in the AI-spending debate rather than a definitive resolution of it.
What investors should watch
- Whether Thursday's rally extends into Friday and beyond, or proves to be a single-session bounce
- Additional chip-sector earnings in the weeks ahead, to see whether Microsoft and Amazon's optimism is echoed by pure-play semiconductor companies
- How Asian markets, particularly the Kospi, respond to the improved sentiment out of the US
- Whether "circular financing" concerns resurface once the immediate excitement from this week's earnings fades
Bottom line
Thursday's rally shows just how quickly sentiment can reverse when the market gets the specific proof points it's been demanding — accelerating growth paired with disciplined spending. Whether this marks a genuine turning point for the chip-sector selloff or simply a sharp, earnings-driven bounce within a still-volatile stretch will become clearer as trading continues into next week.
This post is based on reporting from Bloomberg as of July 30, 2026. This content is for informational purposes only and does not constitute investment advice.
