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

AMBARELLA INC

AMBA · Nasdaq · CIK 0001280263 · Technology · Semiconductor Equipment & Materials

INSIDER SIGNAL

No active buy signal

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

30 Form 4 transaction lines observed in the same window
21 sales · 9 option, withholding, award, gift or other lines

Last qualifying purchase2022-03-07 · VERHALEN ANDREW W · $1.0M

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
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
Young John AlexanderCFO
▼○▼▼▼▼
Wang Feng-MingCEO
▼○▼▼▼
PAISLEY CHRISTOPHER BDirector
▼○▼
Ju Chi-HongSenior VP, Systems & GM
▼▼▼
Lee Chan WChief Operations Officer
▼▼
Chen Yun-LungVP, Business Development and
▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 6 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. Last qualifying purchase: 2022-03-07 · VERHALEN ANDREW W.

Recent Form 4 activity

0Purchases
44Sales
28Other Form 4 lines
46SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING21 sale line(s) · context only
OTHER9 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
+3.1%
3M
-13.2%
6M
+37.0%
12M
—

Volatility & liquidity

Volatility
75.3%
Beta
—
Avg daily value
—

Valuation

Market cap
—
P/E
—

Fundamentals

Profit margin
-19.4%
ROE
-12.8%
Industry
Semiconductor Equipment & Materials

Market data

Price data up to: 2026-10-02 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2026-01-31 · Status: PASS

Short interest

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

Shares short
5,153,912
Previous report
5,707,297
Avg daily volume
1,464,558
Days to cover
3.5

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

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2022-03-07VERHALEN ANDREW WPurchase (P)Ordinary Shares11,455USD 88.60USD 1,014,913SEC filing ↗

Form 4 evidence

72 transaction lines in the latest 365-day window; 702 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-25PAISLEY CHRISTOPHER BSale (S)Ordinary Shares250USD 70.76USD 17,690SEC filing ↗
2026-09-18Young John AlexanderSale (S)Ordinary Shares1,896USD 67.28USD 127,563SEC filing ↗
2026-09-17Young John AlexanderSale (S)Ordinary Shares3,126USD 64.83USD 202,659SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-25PAISLEY CHRISTOPHER BSale (S)Ordinary Shares250USD 70.76USD 17,690SEC filing ↗
2026-09-18Young John AlexanderSale (S)Ordinary Shares1,896USD 67.28USD 127,563SEC filing ↗
2026-09-17Young John AlexanderSale (S)Ordinary Shares3,126USD 64.83USD 202,659SEC filing ↗
2026-09-17Wang Feng-MingSale (S)Ordinary Shares6,086USD 64.83USD 394,555SEC filing ↗
2026-09-17Lee Chan WSale (S)Ordinary Shares2,893USD 64.83USD 187,553SEC filing ↗
2026-09-17Ju Chi-HongSale (S)Ordinary Shares2,009USD 64.83USD 130,243SEC filing ↗
2026-09-08Schwarting Elizabeth MAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08RICHARDSON DAVID JEFFREYAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08PAISLEY CHRISTOPHER BAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08Hu ChenmingAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08Hon Hsiao-WuenAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08Bryant Gregory MAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-09-08Breithaupt Chantelle YvetteAward / grant (A)Ordinary Shares3,151USD 0.00USD 0SEC filing ↗
2026-07-09Chen Yun-LungSale (S)Ordinary Shares5,958USD 78.66USD 468,656SEC filing ↗
2026-07-01Wang Feng-MingSale (S)Ordinary Shares16,250USD 90.08USD 1,463,800SEC filing ↗
2026-07-01Ju Chi-HongSale (S)Ordinary Shares10,000USD 88.84USD 888,400SEC filing ↗
2026-06-26PAISLEY CHRISTOPHER BSale (S)Ordinary Shares250USD 62.01USD 15,502SEC filing ↗
2026-06-17Young John AlexanderSale (S)Ordinary Shares5,033USD 67.54USD 339,946SEC filing ↗
2026-06-17Wang Feng-MingSale (S)Ordinary Shares6,204USD 67.87USD 421,065SEC filing ↗
2026-06-17Wang Feng-MingGift (G)Ordinary Shares10,000USD 0.00USD 0SEC filing ↗
2026-06-17Lee Chan WSale (S)Ordinary Shares2,951USD 67.87USD 200,284SEC filing ↗
2026-06-17Ju Chi-HongSale (S)Ordinary Shares2,017USD 67.87USD 136,894SEC filing ↗
2026-06-12Chen Yun-LungSale (S)Ordinary Shares9,856USD 67.06USD 660,943SEC filing ↗
2026-05-26Young John AlexanderSale (S)Ordinary Shares400USD 96.00USD 38,400SEC filing ↗
2026-05-26Young John AlexanderOption exercise / conversion (M)Ordinary Shares400USD 55.80USD 22,320SEC filing ↗
2026-05-26Wang Feng-MingSale (S)Ordinary Shares32,500USD 91.01USD 2,957,786SEC filing ↗
2026-04-21Young John AlexanderSale (S)Ordinary Shares1,971USD 60.00USD 118,260SEC filing ↗
2026-03-19Young John AlexanderSale (S)Ordinary Shares3,038USD 54.14USD 164,477SEC filing ↗
2026-03-19Wang Feng-MingSale (S)Ordinary Shares8,083USD 54.14USD 437,614SEC filing ↗
2026-03-19Lee Chan WSale (S)Ordinary Shares3,641USD 54.14USD 197,124SEC 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 · —
TickerAMBA
CIK0001280263
SectorTechnology
IndustrySemiconductor Equipment & Materials Yahoo Finance
SEC SIC3674 Semiconductors & Related Devices
ExchangeNasdaq

Data coverage

Local Form 4 history702 transaction lines from 2020-01-09 to 2026-09-25
1 P purchase lines · 377 S sale lines · 324 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.