Corning (GLW) Stock: SVP Sells $2M in Stock as Valuation Concerns Rise

TLDR

• Corning SVP Ronald Verkleeren sold 10,000 GLW shares on May 13, 2026, for $2.08 million
• He now holds 48,143 shares; over the past year he has sold 51,000 shares and bought none
• The stock traded at $207.77 on the day of the sale, giving Corning a market cap of ~$179B
• Corning’s P/E ratio sits at 99.66 — well above the industry median of 32.3
• In the past year, insiders have logged 45 sells and zero buys at Corning

Corning’s (GLW) SVP of Emerging Innovations Group, Ronald Verkleeren, sold 10,000 shares on May 13, 2026, at $207.77 per share — totalling $2,077,700.

Corning Incorporated, GLW

The stock was up 0.86% on the day of the sale. Year-to-date, GLW has surged 136.28%, making it one of the stronger performers in the tech-materials space.

Following the transaction, Verkleeren holds 48,143 shares of Corning. The sale was disclosed via an SEC filing.

This isn’t a one-off. Over the past year, Verkleeren has sold a total of 51,000 shares and has not purchased any.

Zooming out, the picture across the company’s leadership is similar. There have been 45 insider sells and zero insider buys at Corning over the past twelve months.

That pattern tends to get attention from investors who track insider activity as a signal of executive sentiment toward the stock.

Valuation in Focus

At the time of the sale, Corning’s price-to-earnings ratio stood at 99.66. That’s more than three times the industry median of 32.3, and above the company’s own historical median.

GuruFocus estimates Corning’s intrinsic value — using its GF Value metric — at $59.25. With the stock trading at $207.77, the price-to-GF-Value ratio works out to 3.51, which the firm flags as deeply overvalued.

At least one major bank recently raised its long-term valuation assumptions on GLW, but flagged caution in the near term. The reasoning: optical-sector valuations already appear to be pricing in earnings several years out, and visibility into results through 2028 remains limited.

Strong Earnings, but Questions Linger

Corning’s Q1 results were solid. The company posted double-digit revenue and EPS growth, margin expansion, and landed large hyperscaler and solar deals.

Those results support what Corning calls its “Springboard” growth plan, which runs through 2030.

Still, analysts note that temporary costs tied to a solar wafer shutdown are weighing on near-term profitability.

TipRanks’ AI analyst Spark rates GLW as Outperform, pointing to improving financials and bullish technical momentum. The offset, it notes, is valuation risk — a very high P/E and a low dividend yield leave little room for execution missteps, particularly around the solar ramp.

Active bullish options trading was reported following the Q1 print, suggesting some investors remain confident in the longer-term story despite the stretched multiple.

Corning’s current market cap sits at approximately $170.6 billion, with an average daily trading volume of over 13 million shares.

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