Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Amprius Technologies, Inc.

AMPX · NYSE · CIK 0001899287 · Industrials · Electrical Equipment & Parts

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

24 Form 4 transaction lines observed in the same window
14 sales · 10 option, withholding, award, gift or other lines

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Stepien Thomas MChief Executive Officer
▼▼○▼▼▼○○
DIXON DONALD RDirector
▼▼○▼
Sun KangDirector
○▼▼▼
Stefan Constantin IonelChief Technology Officer
▼▼▼
BAYLESS KATHLEEN ADirector
○
SATTERTHWAITE LIVINGSTONDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 1 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot.—

Recent Form 4 activity

0Purchases
37Sales
41Other Form 4 lines
36SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING14 sale line(s) · context only
OTHER10 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
+1.6%
3M
-26.1%
6M
-39.6%
12M
—

Volatility & liquidity

Volatility
101.9%
Beta
2.34
Avg daily value
USD 54.5M

Valuation

Market cap
USD 1.4B
P/E
—

Fundamentals

Profit margin
-60.3%
ROE
-42.4%
Industry
Electrical Equipment & Parts

Market data

Price data up to: 2026-10-03 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · From Yahoo Finance: Market cap · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
22,815,859
Previous report
22,685,478
Avg daily volume
6,005,257
Days to cover
3.8

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

78 transaction lines in the latest 365-day window; 224 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-25Stepien Thomas MGift (G)Common stock5,346USD 0.00USD 0SEC filing ↗
2026-08-25Stepien Thomas MAward / grant (A)Common stock346USD 0.00USD 0SEC filing ↗
2026-08-24Stepien Thomas MSale (S)Common stock8,000USD 10.03USD 80,240SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-25Stepien Thomas MGift (G)Common stock5,346USD 0.00USD 0SEC filing ↗
2026-08-25Stepien Thomas MAward / grant (A)Common stock346USD 0.00USD 0SEC filing ↗
2026-08-24Stepien Thomas MSale (S)Common stock8,000USD 10.03USD 80,240SEC filing ↗
2026-08-21Sun KangSale (S)Common stock62,101USD 10.34USD 642,124SEC filing ↗
2026-08-21Stepien Thomas MSale (S)Common stock23,529USD 10.34USD 243,290SEC filing ↗
2026-08-21Stefan Constantin IonelSale (S)Common stock29,681USD 10.34USD 306,902SEC filing ↗
2026-06-15DIXON DONALD RSale (S)Common stock85,000USD 17.17USD 1,459,450SEC filing ↗
2026-06-12SATTERTHWAITE LIVINGSTONAward / grant (A)Common stock10,423USD 0.00USD 0SEC filing ↗
2026-06-12DIXON DONALD RAward / grant (A)Common stock10,423USD 0.00USD 0SEC filing ↗
2026-06-12Chu StevenAward / grant (A)Common stock10,423USD 0.00USD 0SEC filing ↗
2026-06-12BAYLESS KATHLEEN AAward / grant (A)Common stock10,423USD 0.00USD 0SEC filing ↗
2026-06-09DIXON DONALD RSale (S)Common stock40,000USD 19.13USD 765,200SEC filing ↗
2026-06-04Stepien Thomas MSale (S)Common stock2,000USD 20.97USD 41,940SEC filing ↗
2026-06-04Stepien Thomas MGift (G)Common stock67,298USD 0.00USD 0SEC filing ↗
2026-05-27Sun KangSale (S)Common stock356USD 17.19USD 6,120SEC filing ↗
2026-05-27Stepien Thomas MSale (S)Common stock4,375USD 17.19USD 75,206SEC filing ↗
2026-05-27Stefan Constantin IonelSale (S)Common stock3,208USD 17.19USD 55,146SEC filing ↗
2026-05-26DIXON DONALD RSale (S)Common stock17,895USD 17.90USD 320,320SEC filing ↗
2026-05-21Sun KangSale (S)Common stock67,796USD 14.79USD 1,002,703SEC filing ↗
2026-05-21Stepien Thomas MSale (S)Common stock60,702USD 14.79USD 897,783SEC filing ↗
2026-05-21Stefan Constantin IonelSale (S)Common stock28,812USD 14.79USD 426,129SEC filing ↗
2026-05-05Sun KangAward / grant (A)Common stock6,250USD 0.00USD 0SEC filing ↗
2026-04-01Sun KangSale (S)Common stock1,500,000USD 15.90USD 23,856,489SEC filing ↗
2026-04-01Sun KangOption exercise / conversion (M)Common stock1,500,000USD 2.02USD 3,026,240SEC filing ↗
2026-03-23Sun KangSale (S)Common stock217,869USD 18.80USD 4,096,039SEC filing ↗
2026-03-12HSIEH Wen HsuanSale (S)Common stock413,146USD 18.45USD 7,620,745SEC filing ↗
2026-03-12HSIEH Wen HsuanOption exercise / conversion (M)Common stock270,251USD 2.61USD 705,355SEC filing ↗
2026-03-12Chu StevenSale (S)Common stock155,565USD 18.50USD 2,878,619SEC filing ↗
2026-03-12Chu StevenOption exercise / conversion (M)Common stock155,565USD 1.72USD 267,875SEC filing ↗
2026-03-10Chu StevenSale (S)Common stock166,632USD 17.92USD 2,986,045SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerAMPX
CIK0001899287
SectorIndustrials
IndustryElectrical Equipment & Parts Yahoo Finance
SEC SIC3690 Miscellaneous Electrical Machinery, Equipment & Supplies
ExchangeNYSE

Data coverage

Local Form 4 history224 transaction lines from 2022-09-14 to 2026-08-25
0 P purchase lines · 122 S sale lines · 102 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.