PHLX +429% Rally Hits Air Pocket: Sandisk -10%, Micron -7% as OpenAI IPO Paused
Key Takeaways
- AI semiconductor stocks suffered a sharp repricing on Friday after OpenAI’s IPO delay raised fears of softening chip demand.
- Broadcom, AMD, Micron, and Sandisk all dropped, snapping a multi-year rally that has propelled the PHLX Index up 429%.
- The episode highlights the acute sensitivity of high-beta AI plays to funding sentiment and suggests the AI trade may be entering a more discriminating phase.
Mentioned
Key Intelligence
Key Facts
- 1Broadcom (AVGO) dropped over 3% in early trading on June 26, 2026, but recovered to close up 2.10%.
- 2AMD fell more than 5% intraday and ended the day down 2.50%.
- 3Micron Technology (MU) tumbled over 7% early, still down 5.16% at the time of publication.
- 4Sandisk (SNDK) plunged nearly 10% and was down 8.14% at the close.
- 5OpenAI delayed its IPO to at least 2027 after SpaceX’s volatile debut, where the stock initially surged up to 50% before retreating.
- 6The PHLX Semiconductor Index has surged 429% since early 2023 but has experienced seven corrections of 10% or more in that period.
| Stock | ||
|---|---|---|
| Broadcom (AVGO) | -3% | +2.10% |
| AMD | -5% | -2.50% |
| Micron (MU) | -7% | -5.16% |
| Sandisk (SNDK) | -10% | -8.14% |
Analysis
For investors, the June 26 sell-off in AI semiconductor stocks serves as a stark reminder that high-beta tech sectors remain acutely sensitive to funding sentiment. With the PHLX Index up 429% since early 2023, the delay of OpenAI’s $1T+ IPO—a key demand signal—suggests that the AI trade may be due for a reality check. The intraday swings in Broadcom, AMD, Micron, and Sandisk reveal that even the bluest of AI chip names are not immune to a sudden shift in the IPO landscape.
On Friday, June 26, 2026, a sharp sell-off ripped through AI semiconductor stocks after The New York Times reported that OpenAI is delaying its highly anticipated initial public offering until at least next year. Broadcom (AVGO) dropped more than 3% in early trading before recovering to end the day with a 2.10% gain, while Advanced Micro Devices (AMD) fell over 5%, Micron Technology (MU) tumbled more than 7%, and Sandisk (SNDK) plunged nearly 10%. By the time of publication, the damage had moderated somewhat—AMD was down 2.50%, Micron 5.16%, and Sandisk 8.14%—but the intraday rout underscored just how jittery the AI chip trade has become.
Broadcom (AVGO) dropped more than 3% in early trading before recovering to end the day with a 2.10% gain, while Advanced Micro Devices (AMD) fell over 5%, Micron Technology (MU) tumbled more than 7%, and Sandisk (SNDK) plunged nearly 10%.
The immediate catalyst was a report citing three people close to the matter, stating that OpenAI is shelving its plans for a public debut this year, hoping instead to wait for more hospitable market conditions. The blockbuster IPO of SpaceX earlier in June was supposed to open the floodgates for a wave of mega-cap tech offerings, with OpenAI and rival Anthropic expected to follow. Yet SpaceX’s own debut turned into a volatility nightmare: the stock ended its first day up 19%, surged as much as 50% from its offering price in the days that followed, but then lost most of those gains. That whipsaw spooked OpenAI’s leadership, who had set their sights on a valuation topping $1 trillion—a leap from the $730 billion assigned in its last private funding round.
For investors, the logic is straightforward: OpenAI is one of the world’s largest consumers of AI compute, and any hesitation in its capital-raising timeline dents the near-term demand outlook for the chips that power its models. Broadcom supplies custom ASICs and networking gear for hyperscale data centers; Micron provides high-bandwidth memory essential for AI workloads; AMD’s GPUs compete for those same training and inference tasks; and Sandisk’s flash storage underpins the massive data lakes that AI depends on. If a titan like OpenAI pushes out its public-market funding, other AI labs may follow suit, cooling chip orders.
This incident arrives against a backdrop of extraordinary gains. The PHLX Semiconductor Index—which tracks 30 of the largest U.S.-listed chipmakers—has climbed 429% since the AI adoption wave took hold in early 2023. But the ride has been anything but smooth: the index has suffered seven separate corrections of 10% or more in that span. The volatility of June 26 is thus not an anomaly; it is a feature of a sector where sky-high expectations meet acute sensitivity to funding signals.
What to Watch
Broader implications are threefold. First, the IPO window for AI unicorns may be narrower than previously assumed. Second, the semiconductor supply chain—which has already been dealing with capacity constraints—must now factor in the risk that demand from well-funded private labs could plateau. Third, while the sell-off looks dramatic on a single-day basis, it may also present a buying opportunity for long-term believers; after all, OpenAI remains one of the best-capitalized private companies in history, and its need for cutting-edge compute will not vanish simply because it stays private an extra year.
Looking ahead, all eyes will be on whether the broader AI IPO pipeline holds, whether chip orders continue to ramp for the next generation of models, and whether the PHLX’s 429% rally can absorb a period of recalibration. If history is any guide, more double-digit drawdowns lie ahead—but so too could the next leg of the AI infrastructure buildout.
Timeline
Timeline
SpaceX IPO whipsaw
SpaceX goes public; stock closes first day up 19%, then surges as much as 50% above offering price before losing most gains, creating volatility that spooks other IPO candidates.
OpenAI IPO delay reported, AI chip stocks tumble
The New York Times reports that OpenAI is delaying its IPO to 2027. AI chip stocks plunge in early trading: Broadcom -3%, AMD -5%, Micron -7%, Sandisk -10%.
Partial recovery in chip stocks
By the end of the session, Broadcom closes up 2.10%, AMD down 2.50%, Micron down 5.16%, and Sandisk down 8.14%, paring some losses.
From the Network
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|---|---|
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