Transactions
15
Insider / CORNING INC /NY
Zhang John Z
Exec. Vice President & CCDO at CORNING INC /NY
- Company
- CORNING INC /NY
- Ticker
- GLW
- First filing on record
- February 6, 2026
- Latest trade on record
- May 11, 2026
- SEC filings
- EDGAR ↗
Zhang John Z, Exec. Vice President & CCDO at CORNING INC /NY, has disclosed 15 transactions in GLW since February 6, 2026: 0 purchases (0 open-market buys) and 5 sales, worth about $10.4M at the reported prices. The latest was filed May 12, 2026, 1 day after the trade.
Open-market buys
0
Sales
5
Avg. disclosure lag
1.3d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months Zhang John Z made no purchases and 5 sales worth $10M, plus 10 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Zhang John Z has traded 1 stock on record; the largest by dollars is GLW.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
0 of 7 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 6 | 128,094 | — |
| A | Grant or award | 4 | 63,106 | — |
| S | Open-market sale | 3 | 26,531 | $5.0M |
| F | Shares withheld for tax | 2 | 32,378 | $5.4M |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2026 | 15 | 0 | 5 · $10.4M |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| GLW | Sell S | May 11, 2026 | May 12, 2026 | 1d | 10,000 | $198 | $2.0M | Form 4 ↗ | ||
| GLW | Sell S | May 6, 2026 | May 6, 2026 | 0d | 15,000 | $185 | $2.8M | Form 4 ↗ | ||
| GLW | Option / conversion M | April 15, 2026 | April 16, 2026 | 1d | 18,884 | — | — | derivative | Form 4 ↗ | |
| GLW | Option / conversion M | April 15, 2026 | April 16, 2026 | 1d | 42,687 | — | — | derivative | Form 4 ↗ | |
| GLW | Sell F | April 15, 2026 | April 16, 2026 | 1d | 31,433 | $168 | $5.3M | Form 4 ↗ | ||
| GLW | Option / conversion M | April 15, 2026 | April 16, 2026 | 1d | 18,884 | — | — | Form 4 ↗ | ||
| GLW | Option / conversion M | April 15, 2026 | April 16, 2026 | 1d | 42,687 | — | — | Form 4 ↗ | ||
| GLW | Other A | April 1, 2026 | April 2, 2026 | 1d | 9,692 | — | — | derivative | Form 4 ↗ | |
| GLW | Sell S | February 12, 2026 | February 12, 2026 | 0d | 1,531 | $134 | $205K | Form 4 ↗ | ||
| GLW | Option / conversion M | February 9, 2026 | February 11, 2026 | 2d | 2,476 | — | — | derivative | Form 4 ↗ | |
| GLW | Sell F | February 9, 2026 | February 11, 2026 | 2d | 945 | $131 | $124K | Form 4 ↗ | ||
| GLW | Option / conversion M | February 9, 2026 | February 11, 2026 | 2d | 2,476 | — | — | Form 4 ↗ | ||
| GLW | Other A | February 4, 2026 | February 6, 2026 | 2d | 20,932 | — | — | derivative | Form 4 ↗ | |
| GLW | Other A | February 4, 2026 | February 6, 2026 | 2d | 15,591 | — | — | derivative | Form 4 ↗ | |
| GLW | Other A | February 4, 2026 | February 6, 2026 | 2d | 16,891 | — | — | derivative | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| May 12, 2026 | Form 4 | 0000024741-26-000219 | 1 | published | EDGAR ↗ |
| May 6, 2026 | Form 4 | 0000024741-26-000209 | 1 | published | EDGAR ↗ |
| April 16, 2026 | Form 4 | 0000024741-26-000189 | 5 | published | EDGAR ↗ |
| April 2, 2026 | Form 4 | 0000024741-26-000165 | 1 | published | EDGAR ↗ |
| February 12, 2026 | Form 4 | 0000024741-26-000130 | 1 | published | EDGAR ↗ |
| February 11, 2026 | Form 4 | 0000024741-26-000102 | 3 | published | EDGAR ↗ |
| February 6, 2026 | Form 4 | 0000024741-26-000063 | 3 | published | EDGAR ↗ |
Other insiders at CORNING INC /NY
- Verkleeren Ronald L SVP Emerging Innovations Group 34 rows
- WEEKS WENDELL P Chairman, CEO and President 32 rows
- Gullo Michelle L Senior Vice President & CHRO 31 rows
- Schlesinger Edward A Exec. Vice President and CFO 29 rows
- Amin Jaymin SVP and Chief Tech. Officer 26 rows
- STEVERSON LEWIS A Vice Chairman, EVP and CLAO 26 rows
- Nelson Avery H III Executive Vice President & COO 25 rows
- O'Day Michael Paul SVP and GM, Optical Comm. 25 rows
- Becker Stefan SVP, Finance & Corp Controller 24 rows
- Ferguson Roger W. Jr. Director 23 rows
Everyone on file, with contracts and lobbying under the company's name: CORNING INC /NY.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 7 | 15 | February 6, 2026 | May 12, 2026 | Form 4 list on EDGAR |
Site built October 27, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.