SEC CIK 1611157

Zhang Jack Y.

Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.

Current Positions

CompanyShares OwnedAs Of
AMPHview stock →1,245,1252026-03-15

Position History — AMPH

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

02,543,8655,087,7297,631,5942014-062015-062016-092018-122021-032024-012026-032026-03

Recent Filings — AMPH

DateActivitySharesPriceOwned After
2026-03-15Tax withholding2,908$18.181,245,125
2026-03-15Tax withholding9,784$18.182,990,052
2026-03-10Tax withholding4,395$18.911,248,033
2026-03-10Tax withholding14,785$18.912,999,836
2026-03-09Grant / award (derivative)149,472$0.00149,472
2026-03-09Grant / award (derivative)372,338$0.00372,338
2026-03-09Grant / award72,462$0.001,252,428
2026-03-09Grant / award180,504$0.003,014,621
2026-03-06Tax withholding3,077$19.341,179,966
2026-03-06Tax withholding7,773$19.342,834,117
2026-03-04Tax withholding2,432$19.961,183,043
2026-03-04Tax withholding5,769$19.962,841,890
2025-06-13Option exercise (derivative)200,000$0.00205,003
2025-06-13Option exercise200,000$13.032,847,659
2025-03-17Tax withholding16,150$27.692,647,659
2025-03-17Tax withholding7,223$27.691,185,475
2025-03-15Tax withholding4,115$26.661,192,698
2025-03-15Tax withholding9,765$26.662,663,809
2025-03-14Option exercise (derivative)290,477$0.000
2025-03-14Tax withholding162,657$26.661,196,813
2025-03-14Option exercise211,213$14.691,359,470
2025-03-14Tax withholding226,285$26.662,673,574
2025-03-14Option exercise290,477$14.692,899,859
2025-03-10Grant / award (derivative)104,052$0.00104,052
2025-03-10Grant / award (derivative)246,821$0.00246,821
2025-03-10Grant / award48,996$0.001,148,257
2025-03-10Grant / award116,226$0.002,609,382
2025-03-06Tax withholding3,069$28.321,099,261
2025-03-06Tax withholding9,645$28.322,493,156
2025-03-04Tax withholding5,753$27.622,502,801
2025-03-04Tax withholding2,426$27.621,102,330
2024-11-11Gift125,000$0.001,104,756
2024-11-11Gift125,000$0.002,508,554
2024-09-13Option exercise (derivative)100,000$0.00290,477
2024-09-13Option exercise100,000$14.692,633,554
2024-06-10Option exercise (derivative)100,000$0.00390,477
2024-06-10Option exercise100,000$14.692,533,554
2024-03-17Tax withholding15,768$43.052,433,554
2024-03-17Tax withholding7,052$43.051,229,756
2024-03-15Option exercise (derivative)310,930$0.000
2024-03-15Tax withholding202,658$43.051,236,808
2024-03-15Option exercise310,930$12.461,439,466
2024-03-15Tax withholding408,721$43.052,449,322
2024-03-15Option exercise722,046$12.462,858,043
2024-03-06Tax withholding7,031$46.312,135,997
2024-03-06Tax withholding2,990$46.311,128,536
2024-03-04Grant / award (derivative)57,109$0.0057,109
2024-03-04Grant / award (derivative)135,473$0.00135,473
2024-03-04Grant / award64,310$0.002,143,028
2024-03-04Grant / award27,110$0.001,131,526
2024-01-10Open-market sale50,514$54.891,107,052
2024-01-10Open-market sale920$55.951,106,132
2024-01-10Open-market sale1,716$57.001,104,416
2024-01-10Open-market sale78,236$54.321,157,566
2024-01-09Open-market sale3,714$58.351,235,802
2024-01-09Open-market sale31,764$57.701,239,516
2024-01-09Open-market sale50,678$56.701,271,280
2024-01-08Open-market sale41,282$58.251,395,462
2024-01-08Open-market sale18,858$56.981,436,744
2024-01-08Open-market sale37,865$59.241,357,597
2024-01-08Open-market sale27,563$59.991,330,034
2024-01-08Open-market sale4,261$61.191,325,773
2024-01-08Open-market sale1,663$61.811,324,110
2024-01-08Open-market sale2,152$63.271,321,958
2023-03-17Tax withholding7,052$36.291,455,602
2023-03-17Tax withholding15,768$36.292,078,718
2023-03-16Tax withholding9,998$37.601,462,654
2023-03-16Gift57,365$0.000
2023-03-16Tax withholding25,241$37.602,094,486
2023-03-15Tax withholding2,803$36.841,530,017
2023-03-15Tax withholding8,434$36.842,177,092
2023-03-06Grant / award (derivative)72,278$0.0072,278
2023-03-06Grant / award (derivative)171,488$0.00171,488
2023-03-06Grant / award34,301$0.001,532,820
2023-03-06Grant / award81,383$0.002,185,526
2022-05-20Open-market sale10,650$34.212,104,143
2022-05-19Open-market sale115$34.282,114,793
2022-05-19Open-market sale41,615$33.762,114,908
2022-05-18Open-market sale55,264$33.972,168,305
2022-05-18Open-market sale2,006$35.782,156,523
2022-05-18Open-market sale9,776$34.772,158,529
2022-05-17Open-market sale2,837$36.142,223,569
2022-05-17Open-market sale47,539$35.742,226,406
2022-05-16Open-market sale54,274$35.582,287,740
2022-05-16Open-market sale13,795$36.412,273,945
2022-03-17Tax withholding15,768$34.182,342,014
2022-03-17Tax withholding7,052$34.181,498,519
2022-03-16Tax withholding25,241$34.222,357,782
2022-03-16Tax withholding10,426$34.221,505,571
2022-03-15Grant / award (derivative)74,784$0.0074,784
2022-03-15Grant / award (derivative)177,461$0.00177,461
2022-03-15Grant / award76,914$0.002,397,782
2022-03-15Tax withholding14,759$34.742,383,023
2022-03-15Tax withholding4,786$34.741,515,997
2022-03-15Grant / award32,412$0.001,520,783
2021-03-17Grant / award (derivative)133,585$0.00133,585
2021-03-17Grant / award (derivative)298,688$0.00298,688
2021-03-17Grant / award127,209$0.002,320,868
2021-03-17Grant / award56,892$0.001,488,371
2021-03-16Tax withholding25,241$18.442,193,659
2021-03-16Tax withholding8,890$18.441,431,479
2021-03-15Tax withholding9,592$19.151,440,369
2021-03-15Tax withholding28,088$19.152,218,900
2021-02-18Open-market sale407$18.586,827,679
2021-02-17Open-market sale13,801$18.676,828,086
2021-02-16Open-market sale16,259$18.516,841,887
2021-02-12Open-market sale13,277$18.946,858,146
2021-02-11Open-market sale19,823$19.066,871,423
2021-02-10Open-market sale15,747$18.766,891,246
2021-02-09Open-market sale11,927$18.936,906,993
2021-02-08Open-market sale13,452$18.896,918,920
2021-02-05Open-market sale15,507$18.946,932,372
2021-02-04Open-market sale25,570$18.896,947,879
2021-02-03Open-market sale16,299$18.366,973,449
2021-02-02Open-market sale13,817$18.666,989,748
2021-02-01Open-market sale24,114$18.297,003,565
2020-03-16Grant / award (derivative)181,134$0.00181,134
2020-03-16Grant / award (derivative)405,003$0.00405,003
2020-03-16Grant / award152,724$0.002,246,988
2020-03-16Tax withholding25,873$13.032,094,264
2020-03-16Tax withholding7,771$13.031,381,658
2020-03-16Grant / award68,303$0.001,449,961
2020-03-15Tax withholding9,593$14.191,389,429
2020-03-15Tax withholding27,179$14.192,120,137
2019-09-11Open-market sale300,000$20.827,027,679
2019-03-17Tax withholding13,941$20.231,399,022
2019-03-17Tax withholding32,374$20.232,147,316
2019-03-16Tax withholding11,832$20.231,412,963
2019-03-16Tax withholding27,476$20.232,179,690
2019-03-15Option exercise (derivative)514,783$0.000
2019-03-15Grant / award (derivative)262,182$0.00262,182
2019-03-15Grant / award (derivative)110,671$0.00110,671
2019-03-15Option exercise514,783$15.842,587,100
2019-03-15Tax withholding17,205$20.232,207,166
2019-03-15Tax withholding7,317$20.231,424,795
2019-03-15Option exercise224,737$15.841,591,443
2019-03-15Tax withholding200,853$20.231,390,590
2019-03-15Tax withholding461,097$20.232,126,003
2019-03-15Grant / award98,368$0.002,224,371
2019-03-15Grant / award41,522$0.001,432,112
2018-12-14Open-market sale43,577$20.482,072,317
2018-12-13Open-market sale29,689$20.997,327,679
2018-12-12Open-market sale37,469$21.217,357,368
2018-12-11Open-market sale63,504$21.437,398,090
2018-12-11Open-market sale3,253$22.137,394,837
2018-07-02Option exercise (derivative)186,545$0.000
2018-07-02Tax withholding284,516$15.392,115,894
2018-07-02Option exercise319,791$12.022,400,410
2018-07-02Option exercise186,545$12.021,532,674
2018-07-02Tax withholding165,968$15.391,366,706
2018-05-16Open-market buy15,000$16.062,080,619
2018-05-15Open-market buy25,000$16.082,065,619
2018-03-26Tax withholding20,728$18.612,040,619
2018-03-26Tax withholding8,844$18.611,346,129
2018-03-17Tax withholding9,589$19.911,354,973
2018-03-17Tax withholding30,487$19.912,061,347
2018-03-16Tax withholding7,771$19.911,364,562
2018-03-16Tax withholding19,360$19.912,091,834
2018-03-15Grant / award (derivative)116,392$0.00116,392
2018-03-15Grant / award (derivative)273,692$0.00273,692
2018-03-15Grant / award98,029$0.002,111,194
2018-03-15Grant / award41,687$0.001,372,333
2017-12-15Option exercise (derivative)639,584$0.00319,791
2017-12-15Option exercise (derivative)373,091$0.00186,545
2017-12-15Option exercise639,584$12.022,537,431
2017-12-15Tax withholding524,266$19.302,013,165
2017-12-15Option exercise373,091$12.021,636,469
2017-12-15Tax withholding305,823$19.301,330,646
2017-11-13Option exercise (derivative)319,792$0.00959,375
2017-11-13Option exercise (derivative)186,545$0.00559,636
2017-11-13Option exercise319,792$12.021,897,847
2017-11-13Option exercise186,545$12.021,263,378
2017-09-13Option exercise (derivative)138,632$0.000
2017-09-13Tax withholding153,882$15.861,578,055
2017-09-13Option exercise176,987$11.531,731,937
2017-09-13Option exercise138,632$11.531,197,337
2017-09-13Tax withholding120,504$15.871,076,833
2017-05-23Option exercise (derivative)382,448$0.000
2017-05-23Option exercise264,895$11.511,058,705
2017-05-23Option exercise382,448$11.511,554,950
2017-03-27Tax withholding9,271$14.27793,810
2017-03-27Tax withholding27,480$14.271,172,502
2017-03-26Tax withholding6,704$13.76803,081
2017-03-26Tax withholding21,799$13.761,199,982
2017-03-17Tax withholding23,108$13.751,221,781
2017-03-17Tax withholding9,951$13.75809,785
2017-03-16Grant / award (derivative)211,213$0.00211,213
2017-03-16Grant / award (derivative)490,477$0.00490,477
2017-03-16Grant / award156,554$0.001,244,889
2017-03-16Grant / award67,415$0.00819,736
2016-09-21Option exercise (derivative)55,081$0.000
2016-09-21Open-market sale500$21.451,088,335
2016-09-21Open-market sale54,581$20.701,088,835
2016-09-21Option exercise55,081$16.751,143,416
2016-09-20Option exercise (derivative)207,350$0.0055,081
2016-09-20Option exercise (derivative)181,768$0.000
2016-09-20Open-market sale76,152$20.731,219,533
2016-09-20Option exercise207,350$16.751,295,685
2016-09-20Open-market sale95,213$21.33752,321
2016-09-20Open-market sale86,555$20.74847,534
2016-09-20Option exercise181,768$16.75934,089
2016-09-20Open-market sale131,198$21.331,088,335
2016-03-27Tax withholding8,641$11.96752,321
2016-03-27Tax withholding25,856$11.961,088,335
2016-03-26Tax withholding6,704$11.96760,962
2016-03-26Tax withholding15,711$11.961,114,191
2016-03-17Grant / award (derivative)310,930$0.00310,930
2016-03-17Grant / award (derivative)722,046$0.00722,046
2016-03-17Grant / award184,466$0.001,129,902
2016-03-17Grant / award79,435$0.00767,666
2015-12-11Open-market sale15,066$14.057,461,594
2015-12-10Open-market sale21,915$14.327,476,660
2015-12-09Open-market sale26,319$14.297,498,575
2015-12-08Open-market sale24,359$14.507,524,894
2015-12-07Open-market sale15,046$14.597,549,253
2015-12-04Open-market sale28,712$14.957,564,299
2015-12-03Open-market sale18,583$15.427,593,011
2015-12-01Open-market sale20,000$15.497,611,594
2015-08-17Option exercise (derivative)8,481$0.000
2015-08-17Option exercise8,481$12.97920,117
2015-08-17Option exercise8,481$12.97670,147
2015-06-15Option exercise (derivative)50,061$0.008,481
2015-06-15Tax withholding4,679$16.29911,636
2015-06-15Option exercise50,061$12.97961,697
2015-06-15Open-market sale45,382$16.29916,315
2015-06-12Option exercise (derivative)83,253$0.0058,542
2015-06-12Option exercise (derivative)42,223$0.008,481
2015-06-12Tax withholding7,635$16.15911,636
2015-06-12Option exercise83,253$12.97994,889
2015-06-12Open-market sale75,618$16.15919,271
2015-06-12Tax withholding3,752$16.17661,666
2015-06-12Open-market sale38,471$16.17665,418
2015-06-12Option exercise42,223$12.97703,889
2015-06-12Option exercise (derivative)83,253$0.0058,542
2015-06-12Option exercise (derivative)42,223$0.008,481
2015-06-12Open-market sale75,618$16.15932,276
2015-06-12Option exercise42,223$12.97718,221
2015-06-12Open-market sale38,471$16.17679,750
2015-06-12Option exercise83,253$12.971,007,894
2015-06-11Option exercise (derivative)12,860$0.00141,795
2015-06-11Option exercise (derivative)12,930$0.0050,704
2015-06-11Option exercise12,860$12.97924,496
2015-06-11Open-market sale11,600$16.47912,896
2015-06-11Tax withholding1,266$16.47661,666
2015-06-11Open-market sale11,664$16.47662,932
2015-06-11Tax withholding1,260$16.47911,636
2015-06-11Option exercise12,930$12.97674,596
2015-06-11Option exercise (derivative)12,930$0.0050,704
2015-06-11Option exercise (derivative)12,860$0.00141,795
2015-06-11Open-market sale11,664$16.47675,998
2015-06-11Option exercise12,930$12.97687,662
2015-06-11Open-market sale11,600$16.47924,641
2015-06-11Option exercise12,860$12.97936,241
2015-06-10Option exercise (derivative)12,975$0.00154,655
2015-06-10Option exercise (derivative)12,619$0.0063,634
2015-06-10Option exercise12,619$12.97674,285
2015-06-10Tax withholding1,244$16.38911,636
2015-06-10Open-market sale11,731$16.38912,880
2015-06-10Option exercise12,975$12.97924,611
2015-06-10Open-market sale11,411$16.37662,874
2015-06-10Tax withholding1,208$16.37661,666
2015-06-10Option exercise (derivative)12,975$0.00154,655
2015-06-10Option exercise (derivative)12,619$0.0063,634
2015-06-10Open-market sale11,411$16.37674,732
2015-06-10Option exercise12,619$12.97686,143
2015-06-10Open-market sale11,731$16.38923,381
2015-06-10Option exercise12,975$12.97935,112
2015-06-09Option exercise (derivative)28,433$0.0076,253
2015-06-09Option exercise (derivative)28,324$0.00167,630
2015-06-09Open-market sale25,700$16.24922,137
2015-06-09Option exercise28,324$12.97947,837
2015-06-09Open-market sale25,800$16.12673,524
2015-06-09Option exercise28,433$12.97699,324
2015-06-09Tax withholding2,633$16.23661,666
2015-06-09Tax withholding2,624$16.24911,636
2015-06-08Option exercise (derivative)30,066$0.00195,954
2015-06-08Option exercise (derivative)30,152$0.00104,686
2015-06-08Option exercise30,066$12.97946,533
2015-06-08Open-market sale27,020$16.61919,513
2015-06-08Open-market sale27,100$16.61670,891
2015-06-08Option exercise30,152$12.97697,991
2015-06-08Tax withholding3,052$16.61664,299
2015-06-08Tax withholding3,046$16.61914,260
2015-06-05Option exercise (derivative)50,162$0.00134,838
2015-06-05Option exercise (derivative)48,980$0.00226,020
2015-06-05Option exercise48,980$12.97960,616
2015-06-05Open-market sale44,149$16.46916,467
2015-06-05Open-market sale43,989$16.47667,839
2015-06-05Option exercise50,162$12.97711,828
2015-06-05Tax withholding6,173$16.47667,351
2015-06-05Tax withholding4,831$16.46917,306
2015-03-27Tax withholding8,641$15.43661,666
2015-03-27Tax withholding20,877$15.43911,636
2015-03-26Grant / award (derivative)767,912$0.00767,912
2015-03-26Grant / award (derivative)327,647$0.00327,647
2015-03-26Grant / award125,418$0.00932,513
2015-03-26Grant / award53,511$0.00670,307
2014-06-24———157,987
2014-06-24———7,631,594
2014-06-24———649,108
2014-06-24———200,000
2014-06-24———5,000

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