Sun Kang

Director · Officer · AMPX

As of 2026-09-16, Sun Kang has 42 Form 4 transactions on record across 1 company — 38 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 August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $11.1MIndirect: $513K$11.6Mas of 2026-09-16
  • Direct $11.1M
  • Indirect $513K
AMPXdirect1,218,397 sh$11.1M
AMPXindirect56,406 sh$513K

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

AMPX · 42 trades
2026-08-21: Sale, 62,101 sh ($642K)2026-05-27: Sale, 356 sh ($6K)2026-05-21: Sale, 67,796 sh ($1.0M)2026-05-05: Award / grant, 6,250 sh ($0)2026-04-01: Sale, 1,250,963 sh ($19.7M)2026-04-01: Sale, 249,037 sh ($4.2M)2026-04-01: Option exercise, 1,312,505 sh ($2.3M)2026-04-01: Option exercise, 1,312,505 sh ($2.3M)2026-04-01: Option exercise, 187,495 sh ($690K)2026-04-01: Option exercise, 187,495 sh ($690K)2026-03-23: Sale, 152,823 sh ($2.9M)2026-03-23: Sale, 65,046 sh ($1.2M)2026-02-23: Sale, 61,251 sh ($622K)2026-01-20: Sale, 43,185 sh ($476K)2026-01-20: Option exercise, 43,185 sh ($77K)2026-01-20: Option exercise, 43,185 sh ($0)2026-01-16: Sale, 950,548 sh ($10.5M)2026-01-16: Option exercise, 850,338 sh ($2.1M)2026-01-16: Option exercise, 100,210 sh ($178K)2026-01-16: Option exercise, 850,338 sh ($0)2026-01-16: Option exercise, 100,210 sh ($0)2026-01-12: Sale, 506,267 sh ($5.1M)2026-01-12: Option exercise, 208,264 sh ($508K)2026-01-12: Option exercise, 117,201 sh ($293K)2026-01-12: Option exercise, 180,802 sh ($112K)2026-01-12: Option exercise, 180,802 sh ($0)2026-01-12: Option exercise, 117,201 sh ($0)2026-01-12: Option exercise, 208,264 sh ($0)2025-11-21: Sale, 68,655 sh ($692K)2025-11-17: Sale, 1,000,000 sh ($10.6M)2025-11-17: Option exercise, 202,934 sh ($199K)2025-11-17: Option exercise, 727,950 sh ($36K)2025-11-17: Option exercise, 41,653 sh ($26K)2025-11-17: Option exercise, 27,463 sh ($17K)2025-11-17: Option exercise, 27,463 sh ($0)2025-11-17: Option exercise, 41,653 sh ($0)2025-11-17: Option exercise, 727,950 sh ($0)2025-11-17: Option exercise, 202,934 sh ($0)2025-08-21: Sale, 65,654 sh ($448K)2025-05-21: Sale, 69,786 sh ($170K)2025-03-19: Award / grant, 599,400 sh ($0)2025-02-21: Sale, 34,353 sh ($108K)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-21AMPXSale62,101 @ $10.34$642K−4.8% of holding1,218,397Form 4
2026-05-27AMPXSale356 @ $17.19$6K−0.0% of holding1,280,498Form 4
2026-05-21AMPXSale67,796 @ $14.79$1.0M−5.0% of holding1,280,854Form 4
2026-04-01AMPXSale1,250,963 @ $15.73$19.7M−44.0% of holding1,591,437Form 4
2026-04-01AMPXSale249,037 @ $16.78$4.2M−15.6% of holding1,342,400Form 4
2026-03-23AMPXSale152,823 @ $18.69$2.9M−55.7% of holding121,452Form 4
2026-03-23AMPXSale65,046 @ $19.06$1.2M−53.6% of holding56,406Form 4
2026-02-23AMPXSale61,251 @ $10.16$622K−4.4% of holding1,342,400Form 4
2026-01-20AMPXSale43,185 @ $11.03$476K−3.0% of holding1,403,651Form 4
2026-01-16AMPXSale950,548 @ $11.07$10.5M−40.4% of holding1,403,651Form 4
2026-01-12AMPXSale506,267 @ $10.10$5.1M−26.5% of holding1,403,651Form 4
2025-11-21AMPXSale68,655 @ $10.08$692K−4.7% of holding1,403,651Form 4
2025-11-17AMPXSale1,000,000 @ $10.60$10.6M−40.4% of holding1,472,306Form 4
2025-08-21AMPXSale65,654 @ $6.82$448K−4.3% of holding1,472,306Form 4
2025-05-21AMPXSale69,786 @ $2.43$170K−3.7% of holding1,812,235Form 4
2025-02-21AMPXSale34,353 @ $3.13$108K−2.6% of holding1,282,621Form 4
26 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-05-05AMPXAward / grant6,2501,348,650Form 4
2026-04-01AMPXOption exercise1,312,5052,654,905Form 4
2026-04-01AMPXOption exercise1,312,5050Form 4
2026-04-01AMPXOption exercise187,4952,842,400Form 4
2026-04-01AMPXOption exercise187,4951,787,007Form 4
2026-01-20AMPXOption exercise43,1851,446,836Form 4
2026-01-20AMPXOption exercise43,1851,312,505Form 4
2026-01-16AMPXOption exercise850,3382,253,989Form 4
2026-01-16AMPXOption exercise100,2102,354,199Form 4
2026-01-16AMPXOption exercise850,3380Form 4
2026-01-16AMPXOption exercise100,2101,355,690Form 4
2026-01-12AMPXOption exercise208,2641,792,717Form 4
2026-01-12AMPXOption exercise117,2011,909,918Form 4
2026-01-12AMPXOption exercise180,8021,584,453Form 4
2026-01-12AMPXOption exercise180,8020Form 4
2026-01-12AMPXOption exercise117,201850,338Form 4
2026-01-12AMPXOption exercise208,2640Form 4
2025-11-17AMPXOption exercise202,9341,675,240Form 4
2025-11-17AMPXOption exercise727,9502,403,190Form 4
2025-11-17AMPXOption exercise41,6532,472,306Form 4
2025-11-17AMPXOption exercise27,4632,430,653Form 4
2025-11-17AMPXOption exercise27,463180,802Form 4
2025-11-17AMPXOption exercise41,6530Form 4
2025-11-17AMPXOption exercise727,9500Form 4
2025-11-17AMPXOption exercise202,9340Form 4
2025-03-19AMPXAward / grant599,4001,882,021Form 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.