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AMPX · Amprius Technologies, Inc.
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TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475
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AMPX

Amprius Technologies, Inc.
SEMICONDUCTORS & ELECTRONICS · MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES · CIK 0001899287
FORM 144 · 4☆ WATCH
INSIDER NET · 180D
-$47.8M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
0
FUNDS ADDED · QTR
173
13F, latest reported quarter
REVENUE GROWTH
+205.1%
XBRL, annual
NET MARGIN
-61.2%
CONVERSIONS · 180D
6
codes C/M, not in net · $4.1M priced
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$47.8M over 180 days
-$3.5M over 90 days
below 81% of Semiconductors & Electronics
CONGRESS
no member of Congress has reported trading it
FUNDS
173 funds added or opened last quarter
more than 57% of Semiconductors & Electronics
REVENUE
+205.1% year over year
more than 94% of Semiconductors & Electronics
MARGIN
-61.2% net margin
below 79% of Semiconductors & Electronics
BUYBACKS
no share repurchases reported
SHORT
16.4% of shares outstanding short · 4.2 days to cover · settled 2026-07-31
more than 92% of Semiconductors & Electronics
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$47.8M across 6 people in 180 days.
173 funds added or opened positions in the latest 13F quarter, of 269 holders.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN +35.1%
+35.1%12M
-5%+67%+140%+213%2025-092025-102025-122026-032026-052026-072026-09 2026-04-01 · Sun Kang sold $19.7M2025-11-17 · Sun Kang sold $10.6M2026-01-16 · Sun Kang sold $10.5M2026-01-22 · Stefan Constantin Ionel sold $5.9M2026-03-12 · HSIEH Wen Hsuan sold $5.2M2026-01-12 · Sun Kang sold $5.1M2026-04-01 · Sun Kang sold $4.2M2026-03-10 · Chu Steven sold $3.0M2026-03-23 · Sun Kang sold $2.9M2026-03-12 · HSIEH Wen Hsuan sold $2.4M2025-12-11 · Stefan Constantin Ionel sold $2.1M2026-03-12 · Chu Steven sold $1.9M2026-06-15 · DIXON DONALD R sold $1.5M2026-03-23 · Sun Kang sold $1.2M2026-05-21 · Sun Kang sold $1.0M2026-03-12 · Chu Steven sold $910.5K2026-05-21 · Stepien Thomas M sold $897.8K2026-01-21 · Stefan Constantin Ionel sold $879.4K2026-06-09 · DIXON DONALD R sold $765.2K2025-11-21 · Sun Kang sold $692.0K2026-08-21 · Sun Kang sold $642.2K2026-02-23 · Sun Kang sold $622.3K2026-01-20 · Sun Kang sold $476.3K2026-01-28 · Stefan Constantin Ionel sold $476.3K2026-05-21 · Stefan Constantin Ionel sold $426.1K2026-05-26 · DIXON DONALD R sold $320.3K2026-08-21 · Stefan Constantin Ionel sold $306.9K2026-02-23 · Stefan Constantin Ionel sold $257.7K2025-11-21 · Stefan Constantin Ionel sold $252.2K2026-08-21 · Stepien Thomas M sold $243.3K2026-03-12 · Chu Steven sold $103.1K2026-08-24 · Stepien Thomas M sold $80.2K2026-05-27 · Stepien Thomas M sold $75.2K2026-05-27 · Stefan Constantin Ionel sold $55.1K2026-06-04 · Stepien Thomas M sold $41.9K2026-01-23 · Stefan Constantin Ionel sold $19.2K2026-05-27 · Sun Kang sold $6.1K2026-08-25 · KANG SUN filed to sell $642.2K2026-08-25 · Constantin Ionel Stefan filed to sell $306.9K2026-08-25 · THOMAS M STEPIEN filed to sell $243.3K2026-08-24 · THOMAS M STEPIEN filed to sell $80.2K
INSIDER SELLFORM 144
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $47.8M sold by insiders over 180 days, 173 funds added last quarter, $1.3M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
NVDACRDOVICRMPWRVPLMALABPIMTSIMUAIPAVGOMSI
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, Amprius Technologies, Inc. insiders sold a net $47.8M of stock across 122 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-06.

INSIDER
FILED
SHARES
VALUE
Stepien Thomas M
Chief Executive Officer
SELL
2026-08-24
8,000.0
$80.2K
Stepien Thomas M
Chief Executive Officer
SELL
2026-08-21
23,529.0
$243.3K
Stefan Constantin Ionel
Chief Technology Officer
SELL
2026-08-21
29,681.0
$306.9K
Sun Kang
Director
SELL
2026-08-21
62,101.0
$642.2K
DIXON DONALD R
Director
SELL
2026-06-15
85,000.0
$1.5M
122 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 117 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
11,335,092.0 sh
$157.1M
VANGUARD CAPITAL MANAGEMENT LLC
5,562,985.0 sh
$77.1M
MORGAN STANLEY
5,105,505.0 sh
$70.8M
TWO SIGMA INVESTMENTS, LP
4,318,630.0 sh
$59.9M
UBS Group AG
4,073,080.0 sh
$56.4M
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
KANG SUN
FILED 2026-08-25
$642.2K
Constantin Ionel Stefan
FILED 2026-08-25
$306.9K
THOMAS M STEPIEN
FILED 2026-08-25
$243.3K
THOMAS M STEPIEN
FILED 2026-08-24
$80.2K
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
U.S. Global Technology and Aerospace & Defense ETF
$1.6M POSITION · AS OF 2026-03-31
7.7%
AlphaCentric Robotics and Automation Fund
$1.0M POSITION · AS OF 2026-03-31
4.6%
Strategas Macro Thematic Opportunities ETF
$14.3M POSITION · AS OF 2026-03-31
2.8%
Calamos Timpani Small Cap Growth Fund
$18.7M POSITION · AS OF 2026-04-30
2.5%
Calamos Timpani SMID Growth Fund
$1.2M POSITION · AS OF 2026-04-30
2.4%
Pear tree essex environmental opportunities fund
$614.5K POSITION · AS OF 2026-03-31
2.3%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
2025-122024-122023-122022-12
REVENUE$71.9M$23.6M$8.8M$4.4M
GROSS PROFIT$8.3M$-18.3M$-14.7M$-5.7M
OPERATING INCOME$-46.6M$-46.3M$-38.7M$-18.0M
NET INCOME$-44.0M$-44.7M$-36.8M$-17.3M
EPS (DILUTED)-0.35-0.45-0.43-0.24
OPERATING CASH FLOW$-31.1M$-33.4M$-25.6M$-13.9M
CASH$90.5M$55.2M$45.8M$69.7M
SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-06 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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