InsiderSource
ARM

ARM HOLDINGS PLC /UK

SEC CIK 1973239
$380.81 +263.0% · 90 days
90-day buys
$0
0 open-market
90-day sells
$56.6M
27 open-market
Net insider flow
−$56.6M
Net selling
Filings shown
46
Most recent
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At a glance

Over the last 90 days, insiders at ARM have sold a net $56.6M of stock (0 open-market buys vs 27 sells).

Largest recent trade: Collins Spencer sold $8.8M of ARM, trimming their stake 100%.

Most active filer: Abbey William, with 12 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for ARM, newest first
View on SEC EDGAR ↗
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ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −1.6%

Collins Spencer sold $173.7K of ARM, trimming their stake 2%.

−$173.7K
836 sh @ $208
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −3.6%

Collins Spencer sold $385.8K of ARM, trimming their stake 4%.

−$385.8K
1,849 sh @ $209
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −11%

Collins Spencer sold $1.12M of ARM, trimming their stake 11%.

−$1.12M
5,353 sh @ $210
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −22%

Collins Spencer sold $2.07M of ARM, trimming their stake 22%.

−$2.07M
9,815 sh @ $211
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −31%

Collins Spencer sold $2.26M of ARM, trimming their stake 31%.

−$2.26M
10,674 sh @ $211
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −48%

Collins Spencer sold $2.38M of ARM, trimming their stake 48%.

−$2.38M
11,197 sh @ $213
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −60%

Collins Spencer sold $1.57M of ARM, trimming their stake 60%.

−$1.57M
7,371 sh @ $214
ARM
ARM HOLDINGS PLC /UK
Sell Collins Spencer · Chief Legal Officer · Open-market sale · filed May 13, 2026 ΔOwn −100%

Collins Spencer sold $1.04M of ARM, trimming their stake 100%.

−$1.04M
4,866 sh @ $214
ARM
ARM HOLDINGS PLC /UK
Sell Abbey William · Chief Commercial Officer · Open-market sale · filed 3w ago ΔOwn −2.7%

Abbey William sold $350.1K of ARM, trimming their stake 3%.

−$350.1K
1,577 sh @ $222
ARM
ARM HOLDINGS PLC /UK
Sell Abbey William · Chief Commercial Officer · Open-market sale · filed 3w ago ΔOwn −2.8%

Abbey William sold $313.8K of ARM, trimming their stake 3%.

−$313.8K
1,577 sh @ $199
ARM
ARM HOLDINGS PLC /UK
Sell Child Jason · Chief Financial Officer · Open-market sale · filed Apr 23, 2026 ΔOwn −12%

Child Jason sold $3.83M of ARM, trimming their stake 12%.

−$3.83M
21,280 sh @ $180
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About ARM insider activity

This page tracks every recent Form 4 filed for ARM HOLDINGS PLC /UK with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is ARM insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for ARM HOLDINGS PLC /UK usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.