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

ARM HOLDINGS PLC /UK

ARM · Nasdaq · CIK 0001973239 · Technology · Semiconductors

INSIDER SIGNAL

No active buy signal

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

77 Form 4 transaction lines observed in the same window
29 sales · 48 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 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
Abbey WilliamChief Commercial Officer
▼▼○○○▼▼▼▼▼▼▼
Child JasonChief Financial Officer
▼○○○▼▼▼
Eaton Charlotte ClaireChief People Officer
○○○▼▼▼
Bartels Laura KathleenChief Accounting Officer
○○▼○○
Collins SpencerChief Legal Officer
▼○○○▼
Grisenthwaite Richard RoyChief Architect
○○○▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 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
41Sales
48Other Form 4 lines
31SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING29 sale line(s) · context only
OTHER48 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
+12.6%
3M
-10.2%
6M
+97.7%
12M
+88.4%

Volatility & liquidity

Volatility
71.5%
Beta
3.79
Avg daily value
USD 1.5B

Valuation

Market cap
USD 314.4B
P/E
303.5×

Fundamentals

Profit margin
18.4%
ROE
10.9%
Industry
Semiconductors

Market data

Price data up to: 2026-10-07 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2026-03-31 · From Yahoo Finance: Market cap, P/E · Status: PASS

Short interest

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

Shares short
16,189,965
Previous report
15,521,694
Avg daily volume
7,051,648
Days to cover
2.3

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

89 transaction lines in the latest 365-day window; 89 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-21Child JasonSale (S)Ordinary Shares10,400USD 300.00USD 3,120,000SEC filing ↗
2026-08-31Haas Rene A.Award / grant (A)Ordinary Shares64USD 108.33USD 6,933SEC filing ↗
2026-08-27Child JasonSale (S)Ordinary Shares10,400USD 255.33USD 2,655,432SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-21Child JasonSale (S)Ordinary Shares10,400USD 300.00USD 3,120,000SEC filing ↗
2026-08-31Haas Rene A.Award / grant (A)Ordinary Shares64USD 108.33USD 6,933SEC filing ↗
2026-08-27Child JasonSale (S)Ordinary Shares10,400USD 255.33USD 2,655,432SEC filing ↗
2026-08-17Bartels Laura KathleenOption exercise / conversion (M)Ordinary Shares1,681USD —USD —SEC filing ↗
2026-08-17Bartels Laura KathleenTax withholding (F)Ordinary Shares856USD 271.43USD 232,344SEC filing ↗
2026-08-07Sine JeffreyGift (G)Ordinary Shares9,572USD 0.00USD 0SEC filing ↗
2026-06-02Bartels Laura KathleenSale (S)Ordinary Shares11,306USD 392.70USD 4,439,866SEC filing ↗
2026-06-01Abbey WilliamSale (S)Ordinary Shares6,566USD 402.72USD 2,644,252SEC filing ↗
2026-05-28Abbey WilliamSale (S)Ordinary Shares4,200USD 343.81USD 1,444,002SEC filing ↗
2026-05-22Abbey WilliamSale (S)Ordinary Shares2,300USD 305.82USD 703,386SEC filing ↗
2026-05-21Eaton Charlotte ClaireSale (S)Ordinary Shares7,805USD 290.01USD 2,263,520SEC filing ↗
2026-05-21Abbey WilliamSale (S)Ordinary Shares4,655USD 287.03USD 1,336,125SEC filing ↗
2026-05-21Eaton Charlotte ClaireSale (S)Ordinary Shares4,000USD 282.77USD 1,131,080SEC filing ↗
2026-05-20Eaton Charlotte ClaireSale (S)Ordinary Shares3,100USD 252.25USD 781,975SEC filing ↗
2026-05-20Child JasonSale (S)Ordinary Shares31,920USD 226.54USD 7,231,157SEC filing ↗
2026-05-20Abbey WilliamSale (S)Ordinary Shares5,069USD 257.18USD 1,303,645SEC filing ↗
2026-05-19Collins SpencerSale (S)Ordinary Shares40,941USD 215.00USD 8,802,315SEC filing ↗
2026-05-19Abbey WilliamSale (S)Ordinary Shares10,887USD 224.14USD 2,440,212SEC filing ↗
2026-05-18Grisenthwaite Richard RoySale (S)Ordinary Shares24,339USD 209.15USD 5,090,502SEC filing ↗
2026-05-15Sine JeffreyOption exercise / conversion (M)Ordinary Shares2,141USD —USD —SEC filing ↗
2026-05-15Schooler RosemaryOption exercise / conversion (M)Ordinary Shares2,141USD —USD —SEC filing ↗
2026-05-15SOHN YOUNGOption exercise / conversion (M)Ordinary Shares2,141USD —USD —SEC filing ↗
2026-05-15SOHN YOUNGTax withholding (F)Ordinary Shares429USD 209.16USD 89,730SEC filing ↗
2026-05-15JACOBS PAUL EOption exercise / conversion (M)Ordinary Shares2,141USD —USD —SEC filing ↗
2026-05-15Haas Rene A.Tax withholding (F)Ordinary Shares143,316USD 209.16USD 29,975,975SEC filing ↗
2026-05-15Haas Rene A.Award / grant (A)Ordinary Shares265,643USD —USD —SEC filing ↗
2026-05-15Grisenthwaite Richard RoyOption exercise / conversion (M)Ordinary Shares22,624USD —USD —SEC filing ↗
2026-05-15Grisenthwaite Richard RoyTax withholding (F)Ordinary Shares21,301USD 209.16USD 4,455,317SEC filing ↗
2026-05-15Grisenthwaite Richard RoyAward / grant (A)Ordinary Shares22,690USD —USD —SEC filing ↗
2026-05-15Eaton Charlotte ClaireOption exercise / conversion (M)Ordinary Shares2,200USD —USD —SEC 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 · —
TickerARM
CIK0001973239
SectorTechnology
IndustrySemiconductors Yahoo Finance
SEC SIC3674 Semiconductors & Related Devices
ExchangeNasdaq

Data coverage

Local Form 4 history89 transaction lines from 2026-03-25 to 2026-09-21
0 P purchase lines · 41 S sale lines · 48 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.