Zhang John Z

Officer · GLW

As of 2026-09-27, Zhang John Z has 52 Form 4 transactions on record across 1 company — 15 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in May in multiple years since 2024 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $805KIndirect: $0$805Kas of 2026-09-27
  • Direct $805K
  • Indirect $0
GLWdirect5,138 sh$805K

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

GLW · 52 trades
2026-05-11: Sale, 10,000 sh ($2.0M)2026-05-06: Sale, 15,000 sh ($2.8M)2026-04-15: Withheld for tax, 31,433 sh ($5.3M)2026-04-15: Option exercise, 18,884 sh ($0)2026-04-15: Option exercise, 42,687 sh ($0)2026-04-15: Option exercise, 18,884 sh ($0)2026-04-15: Option exercise, 42,687 sh ($0)2026-04-01: Award / grant, 9,692 sh ($0)2026-02-12: Sale, 1,531 sh ($205K)2026-02-09: Withheld for tax, 945 sh ($124K)2026-02-09: Option exercise, 2,476 sh ($0)2026-02-09: Option exercise, 2,476 sh ($0)2026-02-04: Award / grant, 16,891 sh ($0)2026-02-04: Award / grant, 20,932 sh ($0)2026-02-04: Award / grant, 15,591 sh ($0)2025-08-12: Sale, 1,212 sh ($79K)2025-08-08: Withheld for tax, 1,264 sh ($83K)2025-08-08: Option exercise, 2,476 sh ($0)2025-05-28: Sale, 9,610 sh ($474K)2025-05-12: Sale, 8,000 sh ($375K)2025-04-15: Withheld for tax, 18,368 sh ($767K)2025-04-15: Option exercise, 14,439 sh ($0)2025-04-15: Option exercise, 14,439 sh ($0)2025-04-15: Option exercise, 21,539 sh ($0)2025-04-15: Option exercise, 21,539 sh ($0)2025-04-01: Award / grant, 24,374 sh ($0)2025-02-18: Sale, 14,111 sh ($745K)2025-02-18: Option exercise, 12,529 sh ($425K)2025-02-18: Option exercise, 12,529 sh ($0)2025-02-10: Withheld for tax, 893 sh ($47K)2025-02-10: Option exercise, 2,475 sh ($0)2025-02-10: Option exercise, 2,475 sh ($0)2025-02-04: Award / grant, 14,717 sh ($0)2025-02-04: Award / grant, 16,996 sh ($0)2025-02-04: Award / grant, 20,248 sh ($0)2024-11-13: Sale, 5,175 sh ($250K)2024-11-13: Option exercise, 5,175 sh ($102K)2024-11-13: Option exercise, 5,175 sh ($0)2024-08-13: Sale, 12,918 sh ($513K)2024-08-08: Withheld for tax, 1,633 sh ($63K)2024-08-08: Option exercise, 2,475 sh ($0)2024-08-08: Option exercise, 721 sh ($0)2024-08-08: Option exercise, 2,475 sh ($0)2024-08-08: Option exercise, 721 sh ($0)2024-05-02: Sale, 12,546 sh ($419K)2024-04-15: Withheld for tax, 11,845 sh ($371K)2024-04-15: Option exercise, 13,652 sh ($0)2024-04-15: Option exercise, 13,652 sh ($0)2024-04-15: Option exercise, 9,548 sh ($0)2024-04-15: Option exercise, 9,548 sh ($0)2024-04-01: Award / grant, 22,498 sh ($0)2024-02-15: Sale, 6,607 sh ($212K)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-05-11GLWSale10,000 @ $198.34$2.0M−66.1% of holding5,138Form 4
2026-05-06GLWSale15,000 @ $184.67$2.8M−49.8% of holding15,138Form 4
2026-02-12GLWSale1,531 @ $133.75$205K−100.0% of holding0Form 4
2025-08-12GLWSale1,212 @ $65.53$79K−100.0% of holding0Form 4
2025-05-28GLWSale9,610 @ $49.29$474K−100.0% of holding0Form 4
2025-05-12GLWSale8,000 @ $46.91$375K−45.4% of holding9,610Form 4
2025-02-18GLWSale14,111 @ $52.78$745K−100.0% of holding0Form 4
2024-11-13GLWSale5,175 @ $48.36$250K−100.0% of holding0Form 4
2024-08-13GLWSale12,918 @ $39.73$513K−100.0% of holding0Form 4
2024-05-02GLWSale12,546 @ $33.42$419K−52.5% of holding11,355Form 4
2024-02-15GLWSale6,607 @ $32.02$212K−34.5% of holding12,546Form 4
41 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-04-15GLWWithheld for tax31,43330,138Form 4
2026-04-15GLWOption exercise18,88461,571Form 4
2026-04-15GLWOption exercise42,6870Form 4
2026-04-15GLWOption exercise18,8840Form 4
2026-04-15GLWOption exercise42,68742,687Form 4
2026-04-01GLWAward / grant9,6929,692Form 4
2026-02-09GLWWithheld for tax9451,531Form 4
2026-02-09GLWOption exercise2,4760Form 4
2026-02-09GLWOption exercise2,4762,476Form 4
2026-02-04GLWAward / grant16,89116,891Form 4
2026-02-04GLWAward / grant20,93242,687Form 4
2026-02-04GLWAward / grant15,59135,839Form 4
2025-08-08GLWWithheld for tax1,2641,212Form 4
2025-08-08GLWOption exercise2,4762,476Form 4
2025-04-15GLWWithheld for tax18,36817,610Form 4
2025-04-15GLWOption exercise14,43935,978Form 4
2025-04-15GLWOption exercise14,4390Form 4
2025-04-15GLWOption exercise21,5390Form 4
2025-04-15GLWOption exercise21,53921,539Form 4
2025-04-01GLWAward / grant24,37424,374Form 4
2025-02-18GLWOption exercise12,52914,111Form 4
2025-02-18GLWOption exercise12,5290Form 4
2025-02-10GLWWithheld for tax8931,582Form 4
2025-02-10GLWOption exercise2,4752,475Form 4
2025-02-10GLWOption exercise2,4754,952Form 4
2025-02-04GLWAward / grant14,71721,539Form 4
2025-02-04GLWAward / grant16,99621,755Form 4
2025-02-04GLWAward / grant20,24820,248Form 4
2024-11-13GLWOption exercise5,1755,175Form 4
2024-11-13GLWOption exercise5,1750Form 4
2024-08-08GLWWithheld for tax1,63312,918Form 4
2024-08-08GLWOption exercise2,47513,830Form 4
2024-08-08GLWOption exercise7210Form 4
2024-08-08GLWOption exercise2,4757,427Form 4
2024-08-08GLWOption exercise72114,551Form 4
2024-04-15GLWWithheld for tax11,84523,901Form 4
2024-04-15GLWOption exercise13,65235,746Form 4
2024-04-15GLWOption exercise13,6520Form 4
2024-04-15GLWOption exercise9,5480Form 4
2024-04-15GLWOption exercise9,54822,094Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.