Corning (GLW) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Corning Incorporated (GLW) insider buying and selling: no purchases, 36 sales
151 Form 4 Table I transactions filed with the SEC by Corning Incorporated insiders between 2025-09-04 and 2026-09-08 (15-month history): 0 open-market purchases and 36 sales, plus 115 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $21.4M by Weeks Wendell P on 2026-02-26.
Corning insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Corning insiders filed 34 sales worth $112.2M on the open market, and no purchases.
The biggest seller was Weeks Wendell P (Chairman, CEO and President): $40.0M in 2 sales, out of 15 different sellers.
The largest trade of the period was a sale of $21.4M on Feb 26, 2026, by Weeks Wendell P (Chairman, CEO and President). Form 4 on sec.gov (0000024741-26-000135).
None of the 34 sales carries the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead).
The last three months show 2 sales, against 12 in the three before. The latest sale from Sep 4, 2026.
Against its sector (Technology, 85 companies with an insider page on this site), over the same dates the median is 22 sales and 0 purchases on the open market. Corning has more sales than 56 of the other 84, ranks 28 of 85 by net dollars sold, and 32 of the 85 have at least one purchase.
The 20 most important trades
With no open-market purchases, the table starts with GLW's sales, largest first. The full history is in the tool above, already searched.
See all 151 GLW trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-02-26 | 2026-02-27 | Weeks Wendell P | Chairman, CEO and President | $21.4M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $154.45 to $157.17, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-06-09 | 2026-06-09 | Weeks Wendell P | Chairman, CEO and President | $18.6M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $183.83 to $190.005, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2025-10-29 | 2025-10-30 | Musser Eric S | Officer | $9.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.805 to $90.6, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-05-08 | 2026-05-08 | Steverson Lewis A | Vice Chairman, EVP and CLAO | $5.4M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.34 to $197.11, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-05-22 | 2026-05-26 | Amin Jaymin | SVP and Chief Tech. Officer | $5.3M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $191.805 to $192.49, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-05-07 | 2026-05-07 | Schlesinger Edward A | Exec. Vice President and CFO | $4.2M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.00 to $187.15, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in the footnote. | SEC |
| 2026-05-11 | 2026-05-12 | Seetharam Soumya | Senior Vice President & CDIO | $4.1M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.84 to $206.75, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth previously in this footnote. | SEC |
| 2026-05-08 | 2026-05-08 | Becker Stefan | SVP, Finance & Corp Controller | $3.9M | S — Open-market sale | SEC |
| 2026-05-15 | 2026-05-18 | Nelson Avery H Iii | Executive Vice President & COO | $3.9M | S — Open-market sale | SEC |
| 2026-02-09 | 2026-02-09 | Kammerud Jordana Daryl | SVP | $3.8M | S — Open-market saleForm 4 footnoteF1 The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.1500 to 128.0250, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-05-06 | 2026-05-06 | Zhang John Z | Exec. Vice President & CCDO | $2.8M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.51 to $184.82, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-02-02 | 2026-02-02 | Musser Eric S | Officer | $2.8M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.00 to $110.04, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-01-29 | 2026-01-29 | Schlesinger Edward A | Exec. Vice President and CFO | $2.2M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $104.06 to $105.04, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in the footnote. | SEC |
| 2026-05-13 | 2026-05-14 | Verkleeren Ronald L | SVP Emerging Innovations Group | $2.1M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $207.50 to $207.95, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2025-10-31 | 2025-11-03 | Steverson Lewis A | Vice Chairman, EVP and CLAO | $2.1M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.93 to $89.14, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-02-10 | 2026-02-11 | Steverson Lewis A | Vice Chairman, EVP and CLAO | $2.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $129.89 to $130.52, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2025-12-10 | 2025-12-11 | Verkleeren Ronald L | SVP Emerging Innovations Group | $2.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.66 to $94.75, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-05-11 | 2026-05-12 | Zhang John Z | Exec. Vice President & CCDO | $2.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $198.00 to $198.85, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-08-28 | 2026-08-31 | Steverson Lewis A | Vice Chairman, EVP and CLAO | $2.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $150.84 to $151.80, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
| 2026-02-09 | 2026-02-09 | Musser Eric S | Officer | $2.0M | S — Open-market saleForm 4 footnoteF1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $130.00 to $130.75, inclusive. The reporting person undertakes to provide to Corning Incorporated, any security holder of Corning Incorporated, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth previously in this footnote. | SEC |
The period balance: money in, money out
In the Form 4 filings submitted between Sep 4, 2025 and Sep 8, 2026 there is not one open-market purchase of Corning Incorporated: 36 sales worth $115.0M and zero dollars bought.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Corning Incorporated's is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| M | Option exercise | 54 | $7.6M |
| F | Tax withholding (shares surrendered for taxes) | 50 | $82.1M |
| S | Open-market sale | 36 | $115.0M |
| G | Gift | 8 | $0 |
| D | Sale back to the issuer | 2 | $255k |
| A | Grant or award | 1 | $0 |
| Total | Everything filed in the period | 151 | $205.0M |
56 of the 151 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 16 distinct people or entities have filed Corning Incorporated transactions: none bought on the open market and 15 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
Of the 15 who sold on the open market (36 sales in all), the three biggest sellers account for $66.6M of the $115.0M: 58% of the money in three people.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Weeks Wendell P | Chairman, CEO and President | 15 | — | $40.0M (2) | 2026-06-09 |
| Musser Eric S | Officer | 8 | — | $15.1M (4) | 2026-02-09 |
| Steverson Lewis A | Vice Chairman, EVP and CLAO | 12 | — | $11.5M (4) | 2026-08-31 |
| Schlesinger Edward A | Exec. Vice President and CFO | 13 | — | $8.3M (3) | 2026-05-07 |
| Amin Jaymin | SVP and Chief Tech. Officer | 13 | — | $6.6M (2) | 2026-05-26 |
| Seetharam Soumya | Senior Vice President & CDIO | 8 | — | $5.6M (2) | 2026-05-12 |
| Becker Stefan | SVP, Finance & Corp Controller | 9 | — | $5.1M (2) | 2026-05-14 |
| Zhang John Z | Exec. Vice President & CCDO | 7 | — | $5.0M (3) | 2026-05-12 |
Shown here are the 8 who moved the most money, out of 16. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Feb 2026: 0 purchases and 12 sales, worth $34.9M. 6 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 2 | $2.8M |
| Oct 2025 | 0 | $0 | 4 | $14.1M |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 0 | $0 | 2 | $3.5M |
| Jan 2026 | 0 | $0 | 2 | $2.2M |
| Feb 2026 | 0 | $0 | 12 | $34.9M |
| Mar 2026 | 0 | $0 | 0 | $0 |
| Apr 2026 | 0 | $0 | 0 | $0 |
| May 2026 | 0 | $0 | 11 | $35.4M |
| Jun 2026 | 0 | $0 | 1 | $18.6M |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 1 | $2.0M |
| Sep 2026 | 0 | $0 | 1 | $1.5M |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Corning Incorporated (GLW) analysis page →
Other Technology companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
None of the 20 sales in the table is flagged as scheduled (10b5-1 plan), the kind signed months ahead and executed automatically. Corning has no open-market purchase (code P) in the history, the most common case in the S&P 500: insiders are already paid in stock. The latest filing is from Sep 8, 2026, and a Form 4 arrives up to two business days after the trade.
18 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.