Corning Inc (GLW) stock analysis
Corning Inc (GLW) clears 3 of this site's 8 mechanical value filters, 3 of 8 Buffett-style checks and 0 of 5 Lynch-style checks. At $123.99 it trades 168.0% above this site's neutral DCF value (a margin of safety of -168.0%). Its earnings quality rates Strong and it returns +0.8% to shareholders net of dilution. Figures are as of October 23, 2026, from SEC filings and market data refreshed weekly; this is educational analysis, not investment advice.
Data as of October 23, 2026. Refreshed weekly from SEC filings and market data.
What does Corning do?
Corning is a materials-science company best known for Gorilla Glass on smartphones. It also makes optical fiber and cables, display glass for TVs and monitors, and ceramic parts for vehicle emissions control.
Brands and businesses it owns
- Gorilla Glass
What stands out about Corning?
- The share price implies 33.8% yearly growth. At $123.99, GLW's free cash flow of $2.71 per share would have to grow 33.8% a year, fading to 2.5% by year 10, for this site's DCF (10% discount rate) to match the price. This site's baseline starts at 8%, so the price asks for more growth than the baseline. Change the assumptions.
- Misses 3 of the 8 value filters. It fails Trailing P/E < 25 (57.69), PEG Ratio < 1.5 (2.31) and Price/Book < 8 (8.73); the other 3 pass and 2 were not evaluated. See every filter.
- The margin of safety is rising. It went from -244% on Oct 7 to -168% on Oct 23 across 5 weekly readings. See the trend.
- Well below its 52-week high. At $123.99, GLW trades 51.5% below its high of $255.69, and 58.9% above its low of $78.03. See the range.
- Weakest against peers: P/E ratio. At 57.7× (peer median 34.5×) it ranks 17th of 19 among electrical equipment stocks this site tracks. See the ranking.
How has Corning's share price moved?
The interactive price chart needs JavaScript.
Is Corning undervalued? The value diligence check
Every value-investing signal this site computes for this stock, gathered in one place: the same real numbers from the tools below, not a new score.
- Margin of safety (DCF) -168.0%
- P/E vs. its own history 57.7x · the middle Real range: 16.5x–81.6x over 5 years (net income per diluted share from each fiscal year's 10-K, paired with the real closing price at that fiscal year-end).
- Wall St. analyst rating Buy · 4.09/5 22 analysts this month: 7 strong buy, 10 buy, 5 hold, 0 sell, 0 strong sell (Finnhub). Down from 4.10 last month.
- Altman Z″-Score (bankruptcy risk) 3.63 · Safe zone
- Earnings quality (is the profit real?) Strong · all 5 checks clean Beneish M-score −2.37 · accruals −3.7% of assets · 247% of profit arrived as cash · stock comp 1.8% of revenue · share count +0.7% a year. From the latest 10-K (year to Dec 2025) - see the Earnings Quality Screener for how each check is scored.
- Shareholder yield (cash back to owners) +0.8% net Latest fiscal year (2025): dividends 0.9% + buybacks 0.1% − stock comp 0.3%, as a share of today's market cap. Over 14 years its split-adjusted share count fell 45%. See Shareholder Yield Leaders.
- Capital needed to grow (See's test) Profit did not grow in 10 years Operating profit $1.5B → $1.4B, capital needed $18B → $19B, 2016–2025 (3-year averages); return on capital now 7% before tax. Buffett's See's Candies needed $0.42 per $1 of new profit, FlightSafety $3.20, a typical grower about $5. See Capital-Light Compounders.
- PEG (growth at a reasonable price) 2.31 · Well above fair P/E 57.7× ÷ 25.0% a year of growth behind it. 258th lowest of 447 stocks with a usable PEG. Lynch's fair value is a PEG of 1; a very high PEG usually means almost no growth, a very low one a profit spike. See PEG Ratio Ranking.
- Compounder lenses (4) 1 of 4 · misses capital-light, cash back, price Capital-light growth: not cleared (profit grew 0.9×, under 2×); Profit is real: cleared; Cash to owners: not cleared (+0.8% a year net); Fair price (PEG): not cleared (PEG 2.31, over 1.5). See Compounders at a Fair Price, which also lets you move the PEG bar.
- Value trap check Clear
- Munger's Inversion Check 3 flags
- Standing vs. sector peers 2 of 7 measures above the median Compared with the 18 other electrical equipment stocks this site tracks: 0 in the top third, 2 in the bottom third.
- Dividend payout sustainability 0/6 · clean
How does Corning compare with its peers?
2 of 7 measures sit above the median of the 18 other electrical equipment stocks tracked here, 2 in the bottom third.
- P/E ratiolower is cheaper · peer median 34.5× 57.7× ✕17th of 19
- Free-cash-flow yieldhigher is cheaper · peer median 3.4% 2.2% ✕17th of 19
- Return on equityhigher is better · peer median 20% 16% –12th of 19
- Net marginhigher is better · peer median 13.4% 11.2% –13th of 19
- Revenue growthhigher is better, year on year · peer median 13.0% 19.4% –7th of 19
- Debt / equitylower is safer · peer median 0.67 0.67 –10th of 19
- Dividend yieldamong dividend payers · peer median 0.73% 0.90% –7th of 14
Peers are the stocks this site tracks in the same sector group, not every listed competitor. The bar runs from the weakest peer (left) to the strongest (right); the tick is the middle. Measures that don't apply to a sector (cash-flow yield for banks, debt for financials) are left out.
What would Buffett & Lynch say?
Buffett's checklist is built around durable, profitable businesses bought at sensible prices, and GLW doesn't clear enough of it yet. In its favor: GLW is currently earning a strong return on shareholders' equity, has grown earnings per share at a solid clip over five years, and earns many times its interest expense, so debt service isn't a worry. Where it comes up short: GLW and its five-year average return on equity falls short too, so this isn't just a one-off dip, carries more debt relative to equity than he typically tolerates, runs thinner pretax margins than he'd like to see, is trading above what a conservative discounted-cash-flow estimate says it's worth right now, and trades rich relative to owner earnings, the real cash the business could pay out.
- ROE (TTM) > 11% ✓
- ROE (5yr avg) > 11% ✕
- Debt/Equity < 0.5 ✕
- Pretax margin > 15% ✕
- EPS growth (5yr) > 7% ✓
- Interest coverage > 5x ✓
- Trading below intrinsic value (DCF) ✕
- Price vs. owner earnings < 25x ✕
- Bonus: returning capital via buybacks FY2025
Lynch looked for growth stories that weren't overpriced for that growth, and GLW falls short of his bar. Where it comes up short: GLW doesn't clear the tighter PEG bar a fast grower needs to justify its pace, is growing earnings outside the 20-50% band he considered sustainable for a fast grower - either not fast enough to earn the label, or a pace he'd flag as unlikely to hold up, is leaning on more debt than he liked a growth story to carry, is priced above what he'd pay even for a company growing this quickly, and isn't generating enough free cash flow to justify a fast grower's richer price.
- PEG < 1 (stricter for fast growers) ✕
- EPS growth 20%-50% ✕
- Debt/Equity < 0.5 ✕
- P/E < 40 ✕
- Price/FCF < 40 ✕
Quantitative approximations of each investor's documented approach, not endorsed by either investor or their estates - commentary, not this site's actual ranking criteria. Buffett never published a numeric checklist: only 2 of his 8 checks here trace to his own documented concepts ("owner earnings," from his 1986 shareholder letter, and "price is what you pay, value is what you get," his case against fixed P/E/P/B ceilings) - the other 6 (ROE, debt, margins, growth, interest coverage) use commonly-cited thresholds that are not numbers he himself published. The 8 hard filters below (plus the Munger check and Graham margin of safety) are this site's real, mechanical screen and are computed completely independently of the checklists above.
Berkshire Hathaway's own filing
Which of the 8 value filters does Corning pass?
- Market Cap > $25B $109.6B
- Trailing P/E < 25 57.69
- PEG Ratio < 1.5 2.31
- Price/Book < 8 8.73
- Price/Sales < 7 6.46
- EPS Growth YoY > -5% +17.8%
- vs 50-day MA (±12%) Not evaluated †
- vs 200-day MA (±12%) Not evaluated †
What is Corning's margin of safety?
-244% on 2026-10-07 → -168% on 2026-10-23 (5 weekly readings).
Where is Corning in its 52-week range?
What is the short interest in Corning?
16,842,925 shares short as of 2026-09-30 (FINRA settlement date). Reported twice a month, so this only changes roughly every two weeks, not daily.
What could go wrong with Corning? Munger's inversion check
"Invert, always invert." Instead of reasons to buy, these are reasons to hesitate, not a verdict, and not everything worth knowing about a business.
- Margin of safety, even in the bull case -58%
- Short interest under 5% of float 2.1%
- Passes most of the 6 fundamental filters 3/6 passed
- Price run-up backed by value, not just momentum +58% off 52wk low
- Debt/equity stable since 2016 0.22 → 0.71
Doesn't cover circle of competence, management quality, or accounting concerns: those need judgment, not data.
How much have Corning shareholders gained per year?
Earnings growth per share plus dividend.
An earnings-based proxy, not a stock-price total return - it doesn't capture multiple expansion/contraction or reinvested dividends. EPS from GLW's own 10-K filings; dividend yield is the current trailing yield on today's price, from the same weekly fetch as the rest of this site.
What do Corning's 10-year financials show?
From GLW's own 10-K filings (SEC EDGAR): up to the last 10 fiscal years. Press any year's bars for the exact figures.
Frequently asked questions about Corning
What kind of company is Corning?
Corning is a materials-science company best known for Gorilla Glass on smartphones. It also makes optical fiber and cables, display glass for TVs and monitors, and ceramic parts for vehicle emissions control. Brands and businesses it owns include Gorilla Glass. This site groups it with Electrical Equipment stocks.
Is Corning trading above or below its DCF value?
At $123.99, GLW trades 168.0% above this site's neutral DCF value of $46.26 per share, a margin of safety of −168.0%. That DCF projects free cash flow for 10 years, with growth starting at 8% and fading to 2.5%, discounted at 10%; it is one set of assumptions, not a forecast. Test your own in the Intrinsic Value Calculator.
How many of this site's 8 value filters does Corning pass?
GLW passes 3 of 8. It passes Market Cap > $25B ($109.6B), Price/Sales < 7 (6.46) and EPS Growth YoY > -5% (+17.8%). It misses Trailing P/E < 25 (57.69), PEG Ratio < 1.5 (2.31) and Price/Book < 8 (8.73). vs 50-day MA (±12%) and vs 200-day MA (±12%) were not evaluated, because the moving-average checks only run on stocks that clear the fundamentals first. The 8-filter list shows every stock that passes all of them.
What growth is Corning's share price pricing in?
At $123.99, GLW's free cash flow of $2.71 per share would have to grow 33.8% a year, fading to 2.5% by year 10, for this site's DCF (10% discount rate) to match the price. This site's baseline starts at 8%, so the price asks for more growth than the baseline. Change the assumptions.
When does Corning report earnings next?
Corning's next earnings report is expected on October 27, 2026 before the market opens, with analysts expecting earnings of $0.89 per share. Dates come from the Finnhub earnings calendar and can move. In its last 4 quarters it beat the estimate 3 times, by an average of +0.9%.
Does Corning raise any of Munger's inversion flags?
GLW fails 3 of the 5 tests in this site's Munger-style inversion check, so it raises 3 flags: Margin of safety, even in the bull case (-58%); Passes most of the 6 fundamental filters (3/6 passed); and Price run-up backed by value, not just momentum (+58% off 52wk low). It passes Short interest under 5% of float and Debt/equity stable since 2016. Munger's habit was to invert the question and look for reasons to hesitate. These flags are data-driven prompts, not a verdict, and they cannot judge management, competitive position or accounting risk.
Where do these numbers come from?
- Financial statements: Corning's 10-K annual report for the year ended Dec 31, 2025, filed Feb 12, 2026 (filing index). Every earlier year in the 10-year financials comes from the company's older 10-K filings, all listed on SEC EDGAR.
- Prices and market data: quotes, P/E and analyst ratings from Finnhub; daily price history and the 52-week range from Twelve Data, both refreshed weekly. Short interest comes from FINRA, reported twice a month.
- How to check a figure: click any number in the card above to see its exact source, and read the Editorial Standards for every rule behind the checks.
About this Corning Inc analysis
This page shows every value-investing check the site runs on Corning Inc (GLW) in one place: the 8 mechanical filters, the Buffett and Lynch checklists, a margin of safety from a disclosed DCF, earnings quality, shareholder yield and how it ranks against its sector peers. The numbers come from SEC filings and public market data, refreshed weekly, and the same rules apply to every stock on the stock list. See Editorial Standards for the sources and the rules, or run your own filters in the stock screener.