Corning’s AI-Driven Rally Hits a Crossroads as Shares Plunge 28% From Record

The stock that turned a glass-and-cable manufacturer into a $192 billion AI darling is now confronting a brutal reality check. Corning’s shares careened from a record high of €238.30 on June 30 to a trough of €171.54 on Thursday, a slide of 28% in just seven trading sessions. Friday brought a modest reprieve, with the stock rebounding 3% to €176.78, but the damage to investor confidence runs deeper than a one-day bounce can repair.

The catalyst for the sell-off was not company-specific. A far weaker-than-expected US jobs report on July 2 – only 57,000 new positions versus the 110,000 to 113,000 economists had penciled in – triggered a broad flight from high-momentum AI and semiconductor names. For Corning, which had rocketed 121.69% year-to-date before the sell-off began, the macro jolt gave profit-takers an excuse to cash in some of those staggering gains. After Friday’s recovery, the YTD advance now stands at roughly 128%.

What makes this correction more than a garden-variety pullback is the sheer altitude the stock had achieved. Corning’s 12-month return hit a dizzying 291% at the peak, fueled by a string of blockbuster deals: a wide-ranging technology partnership with Nvidia that entails a tenfold expansion of US capacity for optical connectivity solutions, and a billion-dollar pact with Meta Platforms to supply fiber-optic technology for its data centers. These announcements justified a re-rating – but the market priced in years of future growth in a matter of weeks.

Technical indicators underscore the strain. The stock still trades 60% above its 200-day moving average of €110.12, a gap that statisticians would call extreme even after the steep decline (the average itself crept up from €109.58 as the stock slid). The relative strength index has fallen back to a neutral 50.3, meaning the earlier overbought condition has dissipated. But with annualized 30-day volatility of 112.08%, Corning shares remain prone to violent swings in either direction.

Should investors sell immediately? Or is it worth buying Corning?

On the bullish side, the structural case for Corning’s role in the AI infrastructure build-out remains intact. Goldman Sachs projects US AI-related investment of up to $1.1 trillion through 2027, a tidal wave that should lift demand for the high-performance glass and fiber-optic cables Corning provides directly to GPU clusters in hyperscale data centers. Mizuho recently reaffirmed its “Outperform” rating with a price target well above current levels, calling Corning a key beneficiary of the megatrend. The company’s first-quarter results support that view: revenue climbed 18.1% to $4.34 billion, and earnings per share of $0.70 beat expectations.

The bear case, however, is equally compelling. Insider stock sales by top executives near the record high – a classic warning sign – have been followed by precisely the kind of hard correction that often punishes rallies built more on fantasy than on hardened earnings. The consensus analyst price target sits at around €180.08 to €180.11, barely 2% above Friday’s close and only 5% above Thursday’s low. That leaves almost no room for error when Corning reports its second-quarter results, which will be the next major catalyst. The market has already effectively discounted a great deal of good news.

Technically, the stock’s near-term fate hinges on the 50-day moving average, currently at €163.83. Holding above that level would keep the long-term uptrend intact, allowing the current weakness to be interpreted as a normal consolidation. A decisive break below it, however, would open the door to a slide toward the 100-day average at €143.62. The next few weeks will tell whether Corning’s AI story has the earnings power to support its €192 billion market capitalization – or whether the stock was simply the latest vehicle for a momentum trade that has now run its course.