Lee John Tseng-Chung

Director · Officer · MKSI, CGNX

As of 2026-09-16, Lee John Tseng-Chung has 94 Form 4 transactions on record across 2 companies — 49 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.

Reconstructed holdings

Direct: $31.7MIndirect: $0$31.7Mas of 2026-09-16
  • Direct $31.7M
  • Indirect $0
MKSIdirect134,776 sh$31.7M

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

MKSI · 82 trades
2026-08-14: Sale, 10,000 sh ($3.0M)2026-05-22: Sale, 10,000 sh ($3.2M)2026-02-20: Sale, 13,310 sh ($3.4M)2026-02-20: Sale, 12,812 sh ($3.3M)2026-02-20: Sale, 1,988 sh ($513K)2026-02-20: Sale, 1,890 sh ($491K)2026-02-17: Withheld for tax, 32,548 sh ($8.5M)2026-02-17: Option exercise, 7,654 sh2026-02-17: Option exercise, 22,088 sh2026-02-17: Option exercise, 12,091 sh2026-02-17: Option exercise, 16,989 sh2026-02-17: Option exercise, 7,208 sh2026-02-17: Option exercise, 3,859 sh2026-02-17: Option exercise, 7,654 sh2026-02-17: Award / grant, 15,593 sh2026-02-17: Option exercise, 22,088 sh2026-02-17: Option exercise, 12,091 sh2026-02-17: Option exercise, 16,989 sh2026-02-17: Option exercise, 7,208 sh2026-02-17: Option exercise, 3,859 sh2026-02-17: Option exercise, 7,654 sh2026-02-17: Option exercise, 22,088 sh2026-02-17: Award / grant, 15,593 sh2026-02-17: Option exercise, 12,091 sh2026-02-17: Option exercise, 16,989 sh2026-02-17: Option exercise, 7,208 sh2026-02-17: Option exercise, 3,859 sh2026-02-17: Option exercise, 3,859 sh2026-02-17: Option exercise, 7,654 sh2026-02-17: Option exercise, 22,088 sh2026-02-17: Option exercise, 12,091 sh2026-02-17: Option exercise, 16,989 sh2026-02-17: Option exercise, 7,208 sh2026-02-08: Award / grant, 50,972 sh2026-02-08: Award / grant, 50,972 sh2025-10-31: Withheld for tax, 2,003 sh ($288K)2025-10-31: Option exercise, 1,651 sh2025-10-31: Option exercise, 352 sh2025-10-31: Option exercise, 352 sh2025-10-31: Option exercise, 1,651 sh2025-10-31: Option exercise, 352 sh2025-10-31: Option exercise, 1,651 sh2025-10-31: Option exercise, 352 sh2025-10-31: Option exercise, 1,651 sh2025-02-18: Withheld for tax, 27,332 sh ($2.8M)2025-02-18: Option exercise, 14,041 sh2025-02-18: Award / grant, 37,925 sh2025-02-18: Option exercise, 7,207 sh2025-02-18: Option exercise, 4,035 sh2025-02-18: Option exercise, 7,654 sh2025-02-18: Option exercise, 22,088 sh2025-02-18: Option exercise, 7,207 sh2025-02-18: Option exercise, 4,035 sh2025-02-18: Option exercise, 7,654 sh2025-02-18: Option exercise, 22,088 sh2025-02-18: Option exercise, 7,207 sh2025-02-18: Option exercise, 4,035 sh2025-02-18: Option exercise, 7,654 sh2025-02-18: Option exercise, 6,735 sh2025-02-18: Option exercise, 14,041 sh2025-02-18: Award / grant, 37,925 sh2025-02-18: Option exercise, 22,088 sh2025-02-18: Option exercise, 6,735 sh2025-02-18: Option exercise, 14,041 sh2025-02-18: Option exercise, 6,735 sh2025-02-18: Option exercise, 14,041 sh2025-02-18: Option exercise, 7,207 sh2025-02-18: Option exercise, 4,035 sh2025-02-18: Option exercise, 7,654 sh2025-02-18: Option exercise, 22,088 sh2025-02-18: Option exercise, 6,735 sh2025-02-10: Award / grant, 12,107 sh2025-02-10: Award / grant, 12,107 sh2024-12-06: Withheld for tax, 2,994 sh ($343K)2024-12-06: Option exercise, 984 sh2024-12-06: Option exercise, 2,010 sh2024-12-06: Option exercise, 2,010 sh2024-12-06: Option exercise, 2,010 sh2024-12-06: Option exercise, 2,010 sh2024-12-06: Option exercise, 984 sh2024-12-06: Option exercise, 984 sh2024-12-06: Option exercise, 984 sh
CGNX · 12 trades
2026-02-21: Option exercise, 2,913 sh ($0)2026-02-21: Option exercise, 2,913 sh ($0)2026-02-18: Option exercise, 8,324 sh ($0)2026-02-18: Option exercise, 8,324 sh ($0)2026-02-17: Award / grant, 4,817 sh ($0)2025-05-09: Option exercise, 1,848 sh ($0)2025-05-09: Option exercise, 1,848 sh ($0)2025-02-21: Option exercise, 1,747 sh ($0)2025-02-21: Option exercise, 1,747 sh ($0)2025-02-20: Option exercise, 6,973 sh ($0)2025-02-20: Option exercise, 6,973 sh ($0)2025-02-18: Award / grant, 8,324 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-14MKSISale10,000 @ $302.01$3.0M−6.9% of holding134,776Form 4
2026-05-22MKSISale10,000 @ $315.48$3.2M−6.5% of holding144,696Form 4
2026-02-20MKSISale13,310 @ $256.05$3.4M−7.2% of holding171,386Form 4
2026-02-20MKSISale12,812 @ $256.93$3.3M−7.5% of holding158,574Form 4
2026-02-20MKSISale1,988 @ $257.81$513K−1.3% of holding156,586Form 4
2026-02-20MKSISale1,890 @ $259.70$491K−1.2% of holding154,696Form 4
88 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-02-21CGNXOption exercise2,9130Form 4
2026-02-21CGNXOption exercise2,91324,820Form 4
2026-02-18CGNXOption exercise8,32421,907Form 4
2026-02-18CGNXOption exercise8,3240Form 4
2026-02-17MKSIWithheld for tax32,548184,696Form 4
2026-02-17CGNXAward / grant4,8174,817Form 4
2026-02-17MKSIOption exercise7,654177,097Form 4
2026-02-17MKSIOption exercise22,088169,443Form 4
2026-02-17MKSIOption exercise12,09184,828Form 4
2026-02-17MKSIOption exercise16,98996,919Form 4
2026-02-17MKSIOption exercise7,208113,909Form 4
2026-02-17MKSIOption exercise3,859121,117Form 4
2026-02-17MKSIOption exercise7,654124,976Form 4
2026-02-17MKSIAward / grant15,593154,717Form 4
2026-02-17MKSIOption exercise22,088132,629Form 4
2026-02-17MKSIOption exercise12,09184,828Form 4
2026-02-17MKSIOption exercise16,98996,919Form 4
2026-02-17MKSIOption exercise7,208113,909Form 4
2026-02-17MKSIOption exercise3,859121,117Form 4
2026-02-17MKSIOption exercise7,654124,976Form 4
2026-02-17MKSIOption exercise22,088132,629Form 4
2026-02-17MKSIAward / grant15,593154,717Form 4
2026-02-17MKSIOption exercise12,091217,244Form 4
2026-02-17MKSIOption exercise16,989205,153Form 4
2026-02-17MKSIOption exercise7,208188,164Form 4
2026-02-17MKSIOption exercise3,859180,956Form 4
2026-02-17MKSIOption exercise3,859180,956Form 4
2026-02-17MKSIOption exercise7,654177,097Form 4
2026-02-17MKSIOption exercise22,088169,443Form 4
2026-02-17MKSIOption exercise12,091217,244Form 4
2026-02-17MKSIOption exercise16,989205,153Form 4
2026-02-17MKSIOption exercise7,208188,164Form 4
2026-02-08MKSIAward / grant50,972139,124Form 4
2026-02-08MKSIAward / grant50,972139,124Form 4
2025-10-31MKSIWithheld for tax2,003147,270Form 4
2025-10-31MKSIOption exercise1,65188,153Form 4
2025-10-31MKSIOption exercise35289,804Form 4
2025-10-31MKSIOption exercise352147,622Form 4
2025-10-31MKSIOption exercise1,651149,273Form 4
2025-10-31MKSIOption exercise35289,804Form 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.