Corning Inc (GLW) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 1, 2026.
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- Filings shown
- 12
- Open-market buys
- 0
- Open-market sells
- 3
Counts cover the 12 most recent Form 4 filings Tradune holds for GLW (filed Jun 9 – Oct 1, 2026); the score below covers only the trailing 90 days (0 buys, 2 sells). No completed check of GLW's Form 4 list on SEC EDGAR is on record yet; the latest GLW filing Tradune holds was filed Oct 1, 2026. This is not guaranteed to be the complete record — see GLW's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 6 filings Tradune holds for GLW filed Aug 31 – Oct 1, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
2 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 0 sales· 0 sh
- checkbox disclosed
- On filings with the box not checked
- 2 sales· 22,974 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Lewis A. SteversonVice Chairman, EVP and CLAO | 0 | 1 | — | 13,100 | −$1,981,929 |
| Michelle L. GulloSenior Vice President & CHRO | 0 | 1 | — | 9,874 | −$1,503,713 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at GLW
No open-market insider purchases (Form 4 code P) were reported for GLW between Jun 9, 2026 and Oct 1, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 228 | $153.76 | — | — | Sep 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 268 | $153.76 | — | — | Sep 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 268 | $153.76 | — | — | Sep 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 268 | $153.76 | — | — | Sep 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 9,874 | $152.29 | 9,384 | −51% | Sep 4, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 13,100 | $151.29 | 15,052 | −47% | Aug 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 137 | $255.43 | — | — | Jun 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 161 | $255.43 | — | — | Jun 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 161 | $255.43 | — | — | Jun 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Grant / award Restricted Stock Unit | 161 | $255.43 | — | — | Jun 30, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 18,378 | $209.83 | 19,258 | −49% | Jun 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 100,000 | $27.03 | 1,008,353 | +11% | Jun 9, 2026 |
| Open-market sale 10b5-1 box not checked | 100,000 | $186.46 | 908,353 | −9.9% | Jun 9, 2026 |
| Option exercise Stock Options (Right to Buy) | 100,000 | — | — | — | Jun 9, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to GLW's (Oct 1, 2026).
Frequently asked about GLW insider activity
How many insiders bought GLW stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of GLW shares were reported by Corning Inc insiders between Jun 9, 2026 and Oct 1, 2026. The 12 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for GLW?
The most recent Form 4 on this page was filed by Stephanie Burns (Director) on Oct 1, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market GLW insider sale shown?
The largest open-market sale among the filings shown was 100,000 GLW shares at $186.46 (about $18,646,070) by Wendell P. Weeks (Chairman, CEO and President) on Jun 9, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track GLW insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.