SEC CIK 1414656

Lee John Tseng-Chung

Reported ownership across 2 companies, sourced from SEC Form 4 filings and updated daily.

Current Positions

CompanyShares OwnedAs Of
MKSIview stock →134,776.2672026-08-14
CGNXview stock →24,8202026-02-21

Position History — MKSI

Reported shares owned immediately after each Form 4 transaction, over time.

072,415144,830217,2442008-102011-032014-022016-022020-022023-122026-052026-08

Recent Filings — MKSI

DateActivitySharesPriceOwned After
2026-08-14Open-market sale10,000$302.01134,776.267
2026-05-22Open-market sale10,000$315.48144,696.108
2026-02-20Open-market sale1,890$259.70154,696.108
2026-02-20Open-market sale1,988$257.81156,586.108
2026-02-20Open-market sale12,812$256.93158,574.108
2026-02-20Open-market sale13,310$256.05171,386.108
2026-02-17Option exercise (derivative)7,653.6—124,975.68
2026-02-17Option exercise (derivative)22,088.09—132,629.28
2026-02-17Grant / award (derivative)15,592.91—154,717.37
2026-02-17Option exercise (derivative)3,859.12—121,116.56
2026-02-17Option exercise (derivative)16,989.44—96,919.12
2026-02-17Option exercise (derivative)12,091—84,828.12
2026-02-17Option exercise (derivative)7,208—113,908.56
2026-02-17Option exercise16,989.44—205,153.41
2026-02-17Option exercise12,091—217,244.41
2026-02-17Tax withholding32,548.31$260.74184,696.11
2026-02-17Option exercise7,208—188,163.97
2026-02-17Option exercise3,859.12—180,955.97
2026-02-17Option exercise22,088.09—169,443.25
2026-02-17Option exercise7,653.6—177,096.85
2026-02-08Grant / award (derivative)50,971.84—139,124.46
2025-10-31Option exercise (derivative)352—89,803.62
2025-10-31Option exercise (derivative)1,651—88,152.62
2025-10-31Option exercise352—147,621.52
2025-10-31Tax withholding2,003$143.71147,269.52
2025-10-31Option exercise1,651—149,272.52
2025-02-18Option exercise (derivative)22,088—109,051.74
2025-02-18Option exercise (derivative)4,035.12—97,362.62
2025-02-18Option exercise (derivative)7,654—101,397.74
2025-02-18Option exercise (derivative)7,207—90,155.62
2025-02-18Option exercise (derivative)6,735.33—131,139.74
2025-02-18Option exercise (derivative)14,041.44—137,875.07
2025-02-18Grant / award (derivative)37,925.48—151,916.51
2025-02-18Option exercise14,041.44—126,729.99
2025-02-18Option exercise6,735.33—133,465.32
2025-02-18Option exercise22,088—155,553.32
2025-02-18Tax withholding27,332$103.67147,117.44
2025-02-18Option exercise7,207—174,449.44
2025-02-18Option exercise4,035.12—167,242.44
2025-02-18Option exercise7,654—163,207.32
2025-02-10Grant / award (derivative)12,106.58—113,991.03
2024-12-06Option exercise (derivative)984—101,884.45
2024-12-06Option exercise (derivative)2,010—102,868.45
2024-12-06Option exercise2,010—114,698.55
2024-12-06Option exercise984—115,682.55
2024-12-06Tax withholding2,994$114.60112,688.55
2024-02-15Grant / award (derivative)22,607.99—169,412.7
2024-02-15Option exercise (derivative)23,093—112,531.45
2024-02-15Option exercise (derivative)7,653—104,878.45
2024-02-15Option exercise (derivative)14,041—142,358.45
2024-02-15Option exercise (derivative)3,777.85—156,399.45
2024-02-15Option exercise (derivative)9,235.4—160,177.3
2024-02-15Option exercise (derivative)6,734—135,624.45
2024-02-15Option exercise23,093—135,019.01
2024-02-15Option exercise6,734—111,926.01
2024-02-15Tax withholding30,231$122.15112,441.01
2024-02-15Option exercise7,653—142,672.01
2024-02-15Option exercise14,041—105,192.01
2024-02-15Option exercise3,777.85—91,151.01
2024-02-15Option exercise9,235.4—87,373.16
2024-02-05Grant / award (derivative)69,279.09—146,804.71
2023-12-01Option exercise (derivative)390—80,410.12
2023-12-01Option exercise (derivative)1,186—79,224.12
2023-12-01Option exercise (derivative)160—79,064.12
2023-12-01Option exercise (derivative)970—77,525.12
2023-12-01Option exercise (derivative)569—78,495.12
2023-12-01Option exercise160—79,874.61
2023-12-01Option exercise1,186—79,714.61
2023-12-01Option exercise390—78,528.61
2023-12-01Tax withholding3,275$84.1978,138.61
2023-12-01Option exercise970—81,413.61
2023-12-01Option exercise569—80,443.61
2023-02-15Option exercise (derivative)4,281.59—116,013.12
2023-02-15Grant / award (derivative)23,930.6—127,830.44
2023-02-15Option exercise (derivative)7,018—80,800.12
2023-02-15Option exercise (derivative)14,634—87,818.12
2023-02-15Option exercise (derivative)7,535.72—120,294.71
2023-02-15Option exercise (derivative)9,624—106,389.12
2023-02-15Option exercise (derivative)3,937—102,452.12
2023-02-15Tax withholding20,862$100.2977,862.44
2023-02-15Option exercise7,018—98,724.44
2023-02-15Option exercise14,634—91,706.44
2023-02-15Option exercise3,937—77,072.44
2023-02-15Option exercise9,624—73,135.44
2023-02-15Option exercise4,281.59—63,511.44
2023-02-15Option exercise7,535.72—59,229.85
2023-02-08Grant / award (derivative)43,902.44—103,899.84
2022-04-29Grant / award (derivative)21,056.33—59,997.4
2022-02-15Option exercise (derivative)7,535—56,783.07
2022-02-15Option exercise (derivative)9,624—42,878.07
2022-02-15Option exercise (derivative)4,281—52,502.07
2022-02-15Option exercise (derivative)3,937—38,941.07
2022-02-15Option exercise (derivative)2,754.82—64,318.07
2022-02-15Option exercise (derivative)3,065.72—67,072.89
2022-02-15Option exercise9,624—61,418.22
2022-02-15Option exercise3,065.72—37,223.4
2022-02-15Option exercise2,754.82—39,978.22
2022-02-15Option exercise7,535—47,513.22
2022-02-15Option exercise4,281—51,794.22
2022-02-15Option exercise3,937—65,355.22
2022-02-15Tax withholding13,839$152.5551,516.22
2022-01-21Grant / award (derivative)28,873.4—70,138.61
2021-02-16Option exercise (derivative)3,065.72—55,835.03
2021-02-16Grant / award (derivative)11,811.85—63,361.58
2021-02-16Option exercise (derivative)4,281—41,265.21
2021-02-16Option exercise (derivative)7,534—45,546.21
2021-02-16Option exercise (derivative)2,754.82—53,080.21
2021-02-16Option exercise (derivative)257.61—58,900.75
2021-02-16Option exercise (derivative)263.04—59,158.36
2021-02-16Option exercise (derivative)1,950.59—59,421.39
2021-02-16Option exercise (derivative)1,989.6—61,371.98
2021-02-16Option exercise1,950.59—25,648.84
2021-02-16Option exercise1,989.6—23,698.25
2021-02-16Option exercise263.04—25,911.87
2021-02-16Option exercise257.61—26,169.48
2021-02-16Option exercise3,065.72—29,235.2
2021-02-16Option exercise2,754.82—31,990.02
2021-02-16Option exercise7,534—39,524.02
2021-02-16Option exercise4,281—43,805.02
2021-02-16Tax withholding9,804$172.2034,001.02
2021-01-25Grant / award (derivative)22,604.72—51,549.73
2020-02-18Option exercise (derivative)257—34,765.55
2020-02-18Grant / award (derivative)12,843.59—44,665.56
2020-02-18Option exercise (derivative)2,979.49—41,686.07
2020-02-18Option exercise (derivative)2,462.52—39,223.55
2020-02-18Option exercise (derivative)1,989—37,234.55
2020-02-18Option exercise (derivative)1,950—35,284.55
2020-02-18Option exercise (derivative)2,754.82—28,945.01
2020-02-18Option exercise (derivative)3,065.72—31,699.83
2020-02-18Option exercise (derivative)262—35,022.55
2020-02-18Option exercise2,754.82—27,772.15
2020-02-18Tax withholding6,301$113.8721,471.15
2020-02-18Option exercise2,979.49—15,031.08
2020-02-18Option exercise1,989—19,482.61
2020-02-18Option exercise3,065.72—25,017.33
2020-02-18Option exercise2,462.52—17,493.61
2020-02-18Option exercise257—21,951.61
2020-02-18Option exercise1,950—21,432.61
2020-02-18Option exercise262—21,694.61
2020-01-27Grant / award (derivative)9,197.17—31,821.96
2019-02-15Option exercise (derivative)1,950—15,399.18
2019-02-15Grant / award (derivative)8,264.46—23,825.12
2019-02-15Option exercise (derivative)257—15,142.18
2019-02-15Option exercise (derivative)262—7,482.62
2019-02-15Option exercise (derivative)5,218.22—12,712.62
2019-02-15Option exercise (derivative)1,989—7,744.62
2019-02-15Option exercise (derivative)2,462—17,349.18
2019-02-15Option exercise (derivative)2,979—9,733.62
2019-02-15Option exercise (derivative)4,013.94—19,811.18
2019-02-15Option exercise257—19,374.56
2019-02-15Option exercise262—19,117.56
2019-02-15Option exercise1,950—18,855.56
2019-02-15Option exercise1,989—16,905.56
2019-02-15Tax withholding7,650$84.7011,724.56
2019-02-15Option exercise2,462—14,916.56
2019-02-15Option exercise5,218.22—5,461.62
2019-02-15Option exercise4,013.94—9,475.56
2019-02-15Option exercise2,979—12,454.56
2019-01-28J (derivative)2,808.28—18,301.21
2019-01-28J (derivative)370.37—17,930.84
2018-05-09Grant / award (derivative)1,157.41—21,109.49
2018-05-09Grant / award (derivative)771.61—19,310.65
2018-02-20Open-market sale11,832$115.311,600.85
2018-02-20Open-market sale1,600$115.910.85
2018-02-15Option exercise (derivative)3,073.86—19,163.46
2018-02-15Grant / award (derivative)8,775.88—19,952.08
2018-02-15Option exercise (derivative)2,978—11,176.21
2018-02-15Option exercise (derivative)4,014—15,149.46
2018-02-15Option exercise (derivative)5,218—14,154.21
2018-02-15Option exercise (derivative)2,461—12,688.46
2018-02-15Option exercise (derivative)3,780.43—19,372.21
2018-02-15Grant / award (derivative)5,850.59—18,539.05
2018-02-15Option exercise3,073.86—7,006.85
2018-02-15Option exercise2,978—19,216.85
2018-02-15Option exercise2,461—21,677.85
2018-02-15Tax withholding8,245$111.1013,432.85
2018-02-15Option exercise3,780.43—3,932.99
2018-02-15Option exercise4,014—16,238.85
2018-02-15Option exercise5,218—12,224.85
2018-02-12J (derivative)2,141.8—23,152.63
2017-11-13Open-market sale2,113$104.020.77
2017-05-11Option exercise (derivative)3,557.87—25,294.43
2017-05-11Tax withholding1,674$80.501,884.63
2017-05-11Option exercise3,557.87—3,558.63
2017-02-22Open-market sale14,734$67.990.75
2017-02-15Option exercise (derivative)4,013—22,237.32
2017-02-15Grant / award (derivative)11,078.29—37,849.31
2017-02-15Grant / award (derivative)7,385.52—29,323.32
2017-02-15Option exercise (derivative)3,780—34,069.31
2017-02-15Option exercise (derivative)3,073—26,250.32
2017-02-15Option exercise (derivative)5,217—28,852.31
2017-02-15Tax withholding6,449$67.7014,734.75
2017-02-15Option exercise3,780—8,880.75
2017-02-15Option exercise3,073—11,953.75
2017-02-15Option exercise5,217—17,170.75
2017-02-15Option exercise4,013—21,183.75
2017-02-13J (derivative)2,408.19—26,771.02
2017-02-10Option exercise (derivative)4,305.22—29,179.21
2017-02-10Option exercise (derivative)2,869.82—21,937.8
2017-02-10Tax withholding2,377$66.955,100.75
2017-02-10Option exercise2,869.82—7,477.75
2017-02-10Option exercise4,305.22—4,607.94
2016-08-10Open-market sale9,955$46.360.49
2016-07-05Grant / award (derivative)3,557.87—29,734.43
2016-02-26Open-market sale994$32.709,617.1
2016-02-25Option exercise (derivative)2,862.81—26,176.56
2016-02-25Option exercise (derivative)2,105.01—24,807.61
2016-02-25Option exercise2,862.81—10,119.1
2016-02-25Tax withholding1,613$32.7710,611.1
2016-02-25Option exercise2,105.01—12,224.1
2016-02-17Open-market sale1,371$33.267,256.29
2016-02-16Grant / award (derivative)12,040.94—26,912.62
2016-02-16Option exercise (derivative)3,073—14,871.68
2016-02-16Option exercise (derivative)3,780—10,977.96
2016-02-16Grant / award (derivative)18,061.41—29,039.37
2016-02-16Option exercise3,780—7,779.29
2016-02-16Tax withholding2,225$33.228,627.29
2016-02-16Option exercise3,073—10,852.29
2016-02-11Open-market sale574$31.963,999.29
2016-02-11Open-market sale861$31.964,573.29
2016-02-10Option exercise (derivative)2,870—17,944.68
2016-02-10Option exercise (derivative)4,304—14,757.96
2016-02-10Option exercise2,870—7,850.29
2016-02-10Option exercise4,304—4,980.29
2016-02-10Tax withholding2,416$32.705,434.29
2016-01-26J (derivative)2,489.36—19,061.96
2015-05-29Grant / award345.69$30.74345.69
2015-05-14Open-market sale10,747$36.360.68
2015-02-25Option exercise (derivative)2,863.3—23,319.52
2015-02-25Option exercise (derivative)2,105—20,814.68
2015-02-25Option exercise2,863.3—10,258.68
2015-02-25Option exercise2,105—12,363.68
2015-02-25Tax withholding1,616$35.8310,747.68
2015-02-23Option exercise (derivative)1,947.22—26,182.82
2015-02-23Option exercise (derivative)1,325.3—22,919.68
2015-02-23Option exercise1,325.3—8,459.38
2015-02-23Tax withholding1,064$35.607,395.38
2015-02-23Option exercise1,947.22—7,134.08
2015-02-17Grant / award (derivative)13,829.79—28,130.04
2015-02-17Grant / award (derivative)9,219.86—24,244.98
2015-02-10Option exercise (derivative)2,869—15,025.12
2015-02-10Option exercise (derivative)4,304—14,300.25
2015-02-10Tax withholding2,417$35.865,186.86
2015-02-10Option exercise4,304—4,734.86
2015-02-10Option exercise2,869—7,603.86
2014-11-28Grant / award430.86$24.33430.86
2014-06-13Open-market sale9,128$29.550.05
2014-05-30Grant / award433.27$24.529,128.05
2014-02-28Option exercise (derivative)1,892.07—18,604.25
2014-02-28Option exercise (derivative)1,333.34—17,894.12
2014-02-28Option exercise1,333.34—9,744.78
2014-02-28Tax withholding1,050$30.068,694.78
2014-02-28Option exercise1,892.07—8,411.45
2014-02-25Option exercise (derivative)2,862.3—20,496.32
2014-02-25Option exercise (derivative)2,105—19,227.46
2014-02-25Option exercise2,105—8,137.38
2014-02-25Tax withholding1,618$29.776,519.38
2014-02-25Option exercise2,862.3—6,032.38
2014-02-24Option exercise (derivative)1,324—21,332.46
2014-02-24Option exercise (derivative)1,947.27—23,358.62
2014-02-24Option exercise1,324—4,235.08
2014-02-24Tax withholding1,065$30.023,170.08
2014-02-24Option exercise1,947.27—2,911.08
2014-02-10Grant / award (derivative)12,913.22—26,960.86
2014-02-10Grant / award (derivative)19,369.84—31,762.5
2014-02-10Grant / award (derivative)12,913.22—25,305.89
2014-02-10Grant / award (derivative)8,608.82—22,656.46
2014-01-30J (derivative)884.1—12,392.67
2014-01-30J (derivative)884.1—10,624.47
2013-11-29Open-market buy443.41$23.96963.81
2013-05-31Open-market buy520.4$20.42520.4
2013-03-14Open-market sale8,160$27.640.47
2013-03-04Option exercise (derivative)2,813—11,508.57
2013-03-04Option exercise (derivative)2,084—14,047.64
2013-03-04Option exercise2,813—7,674.47
2013-03-04Option exercise2,084—9,758.47
2013-03-04Tax withholding1,598$26.968,160.47
2013-02-28Option exercise (derivative)1,892.07—14,321.57
2013-02-28Option exercise (derivative)1,332—16,131.64
2013-02-28Option exercise1,332—5,913.47
2013-02-28Tax withholding1,052$27.144,861.47
2013-02-28Option exercise1,892.07—4,581.47
2013-02-25Option exercise (derivative)1,324—11,148.63
2013-02-25Option exercise (derivative)1,946.27—6,741.13
2013-02-25Grant / award (derivative)9,472.51—16,213.64
2013-02-25Grant / award (derivative)6,315.01—17,463.64
2013-02-25Option exercise1,324—3,749.4
2013-02-25Tax withholding1,060$26.922,689.4
2013-02-25Option exercise1,946.27—2,425.4
2013-01-30J (derivative)119.2—8,687.39
2012-11-30Open-market buy479.13$20.61479.13
2012-08-06Open-market sale2,868$26.670
2012-05-31Grant / award478$22.232,868
2012-03-16Option exercise (derivative)2,042—8,806.59
2012-03-16Option exercise (derivative)1,459—12,472.63
2012-03-16Tax withholding1,111$29.602,390
2012-03-16Option exercise1,459—3,501
2012-03-16Option exercise2,042—2,042
2012-03-09Open-market sale8,595$29.130.42
2012-03-05Option exercise (derivative)2,083—13,931.63
2012-03-05Option exercise (derivative)2,812—10,848.59
2012-03-05Option exercise2,083—10,148.42
2012-03-05Tax withholding1,553$28.468,595.42
2012-03-05Option exercise2,812—8,065.42
2012-02-28Option exercise (derivative)1,332—16,014.63
2012-02-28Option exercise (derivative)3,750—0
2012-02-28Option exercise (derivative)1,892.07—13,660.59
2012-02-28Option exercise1,332—3,715.42
2012-02-28Option exercise3,750—7,465.42
2012-02-28Tax withholding2,212$30.635,253.42
2012-02-28Option exercise1,892.07—2,383.42
2012-02-27J (derivative)159.89—15,762.17
2012-02-27J (derivative)159.89—15,922.06
2012-02-23Grant / award (derivative)5,959.95—16,081.95
2012-02-23Grant / award (derivative)3,973.3—17,346.63
2011-11-30Grant / award491.35$21.62491.35
2011-11-08Open-market sale3,140$27.560.94
2011-10-10Option exercise (derivative)3,750$0.000
2011-10-10Tax withholding1,191$23.723,140.94
2011-10-10Option exercise3,750$0.004,331.94
2011-05-31Grant / award581.94$18.26581.94
2011-03-17Open-market sale4,449$29.310.15
2011-03-16Option exercise (derivative)2,042—10,122
2011-03-16Option exercise (derivative)1,458—13,373.34
2011-03-16Option exercise2,042—4,276.15
2011-03-16Option exercise1,458—5,734.15
2011-03-16Tax withholding1,285$28.514,449.15
2011-03-10Option exercise (derivative)1,446—12,164
2011-03-10Option exercise (derivative)2,084—14,831.34
2011-03-10Tax withholding1,296$29.532,234.15
2011-03-10Option exercise2,084—3,530.15
2011-03-10Option exercise1,446—1,446.15
2011-03-08Open-market sale6,129$31.820.15
2011-03-04Option exercise (derivative)2,083—16,915.34
2011-03-04Option exercise (derivative)2,813—13,610
2011-03-04Option exercise2,083—7,926.15
2011-03-04Tax withholding1,797$32.056,129.15
2011-03-04Option exercise2,813—5,843.15
2011-02-28Grant / award (derivative)5,996—20,173
2011-02-28Grant / award (derivative)3,997.34—18,998.34
2011-02-28Option exercise (derivative)3,750—16,423
2011-02-28Option exercise3,750—4,406.15
2011-02-28Tax withholding1,376$30.023,030.15
2011-02-17J (derivative)103—14,177
2011-02-17J (derivative)209.5—13,967.5
2010-11-30Grant / award656$16.19656
2010-11-05Open-market sale2,374$21.600
2010-10-08Option exercise (derivative)3,750$0.0015,001
2010-10-08Option exercise3,750$0.003,750.76
2010-10-08Tax withholding1,376$18.502,374.76
2010-04-26Open-market sale6,623$24.150
2010-03-16Option exercise (derivative)1,458$0.0018,751
2010-03-16Option exercise (derivative)2,041$0.0014,280
2010-03-16Option exercise1,458$0.007,907.76
2010-03-16Tax withholding1,284$19.296,623.76
2010-03-16Option exercise2,041$0.006,449.76
2010-03-10Option exercise (derivative)1,445$0.0016,321
2010-03-10Option exercise (derivative)2,083$0.0020,209
2010-03-10Option exercise2,083$0.005,704.76
2010-03-10Tax withholding1,296$0.004,408.76
2010-03-10Option exercise1,445$0.003,621.76
2010-03-04Grant / award (derivative)6,250$0.0022,292
2010-03-04Grant / award (derivative)8,750$0.0017,766
2010-03-01Option exercise (derivative)3,750$0.0032,558
2010-03-01Tax withholding1,574$18.352,176.76
2010-03-01Option exercise3,750$0.003,750.76
2010-02-11Open-market sale2,409$18.740.76
2009-10-08Option exercise (derivative)3,750$0.0034,558
2009-10-08Tax withholding1,341$19.162,409.76
2009-10-08Option exercise3,750$0.003,750.76
2009-07-28Open-market sale6,187$19.130.76
2009-03-16Grant / award (derivative)8,750$0.0038,308
2009-03-10Option exercise (derivative)3,529$0.0029,558
2009-03-10Option exercise3,529$0.006,578.48
2009-03-10Tax withholding1,350$12.195,228.48
2009-03-02Option exercise (derivative)3,750$0.0035,000
2009-03-02Open-market sale1,574$11.893,049.48
2009-03-02Option exercise3,750$0.004,623.48
2008-11-03Disposition to issuer2,409$18.300
2008-10-08Option exercise (derivative)3,750$0.0038,750
2008-10-08Tax withholding1,341$16.842,409
2008-10-08Option exercise3,750$16.843,750
2008-03-10Grant / award (derivative)12,500$0.0042,500
2007-10-10Grant / award (derivative)30,000$0.0030,000

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.