Latest filingSep 10, 2026Most recent Form 4
ARM
ARM HOLDINGS PLC /UK
NasdaqTechnologySemiconductors & Related Devices
Insider activity for last month from 08/11 to 09/11. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$265M1 sells
Net open-market-$265M3 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period8transactions
- M · Option exercise · dominant4 · 50%
- A · Grants / awards2 · 25%
- F · Tax withholding1 · 13%
- S · Open-market sells1 · 13%
Activity by reported role
A joint filing can contribute to multiple roles8transactions
- CAO · dominant5 · 63%
- Chief executive officer2 · 25%
- Chief financial officer1 · 13%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeBartels Laura KathleenOrdinary Shares · Direct
12,997Aug 17, 2026
Bartels Laura KathleenRestricted Stock Units · Direct
100,390Aug 17, 2026
Child JasonOrdinary Shares · Direct
163,832Aug 27, 2026
Haas Rene A.Ordinary Shares · Direct
338,666Aug 31, 2026
Haas Rene A.Restricted Stock Units · Direct
425,000Sep 09, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 11 → Sep 11
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Top insiders
By absolute net value across the selected period- CJ-$2.7M
Recent filing activity
Most recent 1 transactions · color = transaction code- SSell08/31-$265MSEC
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
ARM transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| ARM | Child Jason | CFO | sale10b5-1 | 10.4k | -$265M | S | 0.0% | 08/31 | 08/27 |
ARM HOLDINGS PLC /UK Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at ARM HOLDINGS PLC /UK?
Haas Rene A., Child Jason, Bartels Laura Kathleen.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Child Jason reported a sale on Aug 27, 2026 valued at $265M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $2,655,432.00. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.