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Insider Trading Intelligence
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KS

Kang Sun

AMPX
CHIEF EXECUTIVE OFFICER · AMPRIUS TECHNOLOGIES, INC. · CIK 0001476220
FILING MIX · LIFETIME45%/55%
BUYS
25
SELLS
31
TOTAL VALUE
$67.48M
COMPANIES
1
ACTIVE SINCE
Sep 2022
HOLDINGS NOW
1,280,498
AVG SELL PX
$9.84
TRADE KIND
SHOWING 56 / 56
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
17 backtested trades · 8 horizons · 34 pending
Forward-return performance of every backtestable P/S trade by Kang Sun, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d17+35.29%+2.32%+0.30%+2.02%+3.09%—
14d17+35.29%+8.18%+1.35%+6.83%+3.37%—
30d17+47.06%+14.64%+2.77%+11.86%+11.45%—
60d17+29.41%+45.58%+1.23%+56.44%+63.73%—
90d17+47.06%+33.69%+6.08%+26.27%-4.16%—
180d17(8 pending)+0.00%+103.88%+9.54%+94.34%+42.16%—
1y17(11 pending)+0.00%+305.65%+15.22%+290.44%+300.48%—
2y17(15 pending)+0.00%+990.51%+41.68%+948.83%+948.83%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
AMPX · 1,280,498 shares · as of May 27, 2026
0710,6001,421,2002,131,8002,842,4002023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 25 buys / 31 sellsCOVERAGE · 16 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
356$17.19$6.1K1,280,498May 27, 2026May 28, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
67,796$14.79$1.00M1,280,854May 21, 2026May 26, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
6,250——1,348,650May 5, 2026May 7, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
1,250,963$15.73$19.68M1,591,437Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
187,495$3.68$690.0K1,787,007Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
1,312,505$1.78$2.34M0Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
249,037$16.78$4.18M1,342,400Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
187,495$3.68$690.0K2,842,400Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
1,312,505$1.78$2.34M2,654,905Apr 1, 2026Apr 2, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
65,046$19.06$1.24M56,406Mar 23, 2026Mar 24, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
152,823$18.69$2.86M121,452Mar 23, 2026Mar 24, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
61,251$10.16$622.0K1,342,400Feb 23, 2026Feb 24, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
43,185——1,312,505Jan 20, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
43,185$11.03$476.3K1,403,651Jan 20, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
43,185$1.78$76.9K1,446,836Jan 20, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
950,548$11.07$10.52M1,403,651Jan 16, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
850,338$2.50$2.13M2,253,989Jan 16, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
100,210——1,355,690Jan 16, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
850,338——0Jan 16, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
100,210$1.78$178.4K2,354,199Jan 16, 2026Jan 20, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
506,267$10.10$5.11M1,403,651Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
117,201$2.50$293.0K1,909,918Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
180,802——0Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
208,264$2.44$508.2K1,792,717Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
180,802$0.62$112.1K1,584,453Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
117,201——850,338Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
208,264——0Jan 12, 2026Jan 14, 2026 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
68,655$10.08$692.1K1,403,651Nov 21, 2025Nov 25, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
Chief Executive Officer
202,934$0.98$198.9K1,675,240Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
41,653——0Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
27,463——180,802Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
Chief Executive Officer
727,950$0.05$36.4K2,403,190Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
727,950——0Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
Chief Executive Officer
41,653$0.62$25.8K2,472,306Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASE
Chief Executive Officer
27,463$0.62$17.0K2,430,653Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
1,000,000$10.60$10.60M1,472,306Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
202,934——0Nov 17, 2025Nov 19, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
65,654$6.82$447.5K1,472,306Aug 21, 2025Aug 25, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
69,786$2.43$169.7K1,812,235May 21, 2025May 23, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
599,400——1,882,021Mar 19, 2025Mar 21, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
34,353$3.13$107.6K1,282,621Feb 21, 2025Feb 24, 2025 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
33,779$1.96$66.4K1,316,974Nov 21, 2024Nov 22, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
967,539——967,539Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
1,974,502——1,974,502Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
208,265——208,265Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
202,934——202,934Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
1,171,476——1,171,476Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
208,264——208,264Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
41,653——41,653Oct 23, 2024Oct 25, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
Chief Executive Officer
33,333$1.04$34.7K1,350,753Aug 21, 2024Aug 22, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
See Remarks
15,611$1.36$21.2K1,384,086May 22, 2024May 24, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
SALE
See Remarks
19,973$1.33$26.5K1,399,697May 21, 2024May 24, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
1,419,670——1,419,670Mar 19, 2024Mar 19, 2024 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
545,962——545,962Sep 14, 2022Sep 16, 2022 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
727,950——727,950Sep 14, 2022Sep 16, 2022 ↗View →
AMPX
AMPRIUS TECHNOLOGIES, INC.
PURCHASEGRANT
Stock grant
1,455,901——1,455,901Sep 14, 2022Sep 16, 2022 ↗View →
Other insiders · AMPX
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About this filer
CIK 0001476220
ROLE
Chief Executive Officer
PRIMARY
AMPX
COMPANIES
1
ACTIVE SINCE
Sep 2022
MARKETPEEL · /INSIDER/0001476220DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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