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ARM — structural market context

Arm Holdings plc

Structural market context from public regulatory and market data, shown with its as-of dates. Descriptive only: nothing on this page is a recommendation, a prediction, or advice to buy or sell any security.

What changed

As of the close on Oct 21. Each line shows the earlier value, the later value and their dates.

Price

Close $226.59 (Oct 21) vs $221.06 (Oct 20): +2.50%.

Volume

0.60× its 20-session average (5.5M) on Oct 21.

Includes pre- and post-market trading.

Short interest

Short interest 16.2M shares (settlement Sep 30) vs 15.5M (Sep 15).

No new publication in this window. Latest: settlement Sep 30, published Oct 10.

Fails-to-deliver

Latest file (settlements Sep 15–Sep 30, published Oct 16): 7 days with fails, largest 50K shares on Sep 30.

Previous file (settlements Sep 1–Sep 14, published Sep 30): 4 days with fails, largest 12K shares on Sep 9.

No new publication in this window.

Analyst rating actions

None recorded in this window.

Insider filings (Form 4)

None recorded in this window.

ARM: what the public data shows

Each row is the latest public record we hold for ARM, with its own date and source. Figures are descriptive and delayed by their source.

DataLatest recordAs ofSource
Short interest→ Short Interest & FTD tracker16.2M shares short · 2.3 days to cover · 1.5% of float · +4.3% vs 2026-09-152026-09-30FINRA
Fails-to-deliver→ Short Interest & FTD tracker50K shares failed to deliver on 2026-09-302026-09-30SEC fails-to-deliver files
Insider Form 4 (P/S)→ Insider Buying tracker0 purchases and 2 sales in 12 months · latest filed 2026-09-23 by Child Jason2026-09-23SEC Form 4
Analyst rating actions4 recent actions · latest published by Piper Sandler on 2026-09-092026-09-09Firms' published actions
Short interest→ Short Interest & FTD tracker
Latest record
16.2M shares short · 2.3 days to cover · 1.5% of float · +4.3% vs 2026-09-15
As of
2026-09-30
Source
FINRA
Fails-to-deliver→ Short Interest & FTD tracker
Latest record
50K shares failed to deliver on 2026-09-30
As of
2026-09-30
Source
SEC fails-to-deliver files
Insider Form 4 (P/S)→ Insider Buying tracker
Latest record
0 purchases and 2 sales in 12 months · latest filed 2026-09-23 by Child Jason
As of
2026-09-23
Source
SEC Form 4
Analyst rating actions
Latest record
4 recent actions · latest published by Piper Sandler on 2026-09-09
As of
2026-09-09
Source
Firms' published actions

ARM short interest & days to cover

SHARES SHORT
16.2M
% OF FLOAT
1.5%
DAYS TO COVER
2.3
CHANGE VS PRIOR
+4.3%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-09-30 (22d ago)

ARM fails-to-deliver (FTD)

Settlement dateFailed sharesPrice
2026-09-30 · 22d50K$293.67
2026-09-28 · 24d2K$310.32
2026-09-25 · 27d2K$306.34

SEC fails-to-deliver files, published twice a month with ~6 weeks of delay.

ARM insider buying and selling (Form 4)

Last 12 months, Form 4 codes P and S: 0 purchases · 2 sales

Most recent Form 4 shown for ARM: Child Jason (Chief Financial Officer) reported a sale (code S) of 10,400 shares at $300.00 on 2026-09-21, filed 2026-09-23 (2 days after the trade).

InsiderTypeSharesPriceValueTrade dateFiled
Child Jason · officer: Chief Financial OfficerSale (S)10K$300.00$3.1M2026-09-212026-09-23 · +2d
Child Jason · officer: Chief Financial OfficerSale (S)10K$255.33$2.7M2026-08-272026-08-31 · +4d

SEC Form 4 filings: purchases and sales reported on Form 4 (transaction codes P and S) only; grants and option exercises excluded. Attributed public records.

ARM analyst ratings

FirmActionRatingPublished
Piper SandlerinitialiseOverweight2026-09-09
Piper Sandlerprice_target—2026-09-09
Raymond JamesholdOutperform2026-08-25
Raymond Jamesprice_target—2026-08-25

Rating actions as published by the firms, from public feeds. They are not graded here.

Frequently asked questions

What is ARM's short interest?
As of the FINRA settlement date 2026-09-30, ARM had 16.2M shares sold short — 1.5% of its float, with 2.3 days to cover at average volume. FINRA publishes this data roughly two weeks after each twice-monthly settlement, so it is inherently delayed. A short-interest figure describes an aggregate position; it does not predict what the stock will do.
Are insiders buying ARM?
In the last 12 months of SEC Form 4 filings, ARM recorded 0 insider purchases and 2 sales reported on Form 4 (transaction codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.
What do analysts say about ARM?
The most recent action: Piper Sandler initialise to Overweight on 2026-09-09. Rating actions are shown as published by the firms; they are not graded here.
Is this page telling me to buy or sell ARM?
No. Everything on this page is descriptive, structural market context from public data, shown with its as-of dates. TradeAI News does not issue directional recommendations, price predictions, or buy/sell advice — for any ticker.
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ARM: the full history

Latest rows shown. Full history, market-wide screens, cluster detection and the context journal live in the dashboard.

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Not financial advice. Trading involves risk. Descriptive structural context, never a recommendation.