The Insider Ledger

Weekly intelligence from public SEC filings

Nothing on this site is investment advice. It is an automated research digest of public SEC filings.

Arm (ARM)

Sector: semiconductors · Tracking since 2026-05-15

What am I looking at?

Everything on this page comes from public SEC filings that name this company. The cards show the automated signal score, net insider activity (open-market buys minus sells over the last 90 days), distinct insider buyers, and watchlist institutions currently holding the stock. The timeline lists each transaction row with a link to the original filing.

insider_buy / insider_sell
An officer or director traded on the open market (Form 4). Scheduled 10b5-1 plan trades are noted and treated as low-signal.
13f_new / 13f_add / 13f_trim / 13f_exit
A watchlist fund opened, increased, reduced, or closed a position between quarterly 13F reports — these become public up to 45 days after the quarter ends.
13d_filed
An investor crossed 5% ownership with activist intent (Schedule 13D).
5
Signal score
−$5.8M
Net insider value 90d
0
Insider buyers 90d
1
Watchlist holders

Watchlist holders

Analysis

Arm CFO Jason Child sells $2.7M under a standing plan weak (2026-W36)

Chief Financial Officer Jason Child sold 10,400 shares for about $2.66M on 2026-08-27 (event 0001973239-26-000122:0), disclosed as a Rule 10b5-1 plan transaction. Routine scheduled selling, not a discretionary decision made this week.

Arm CFO Jason Child sells $3.1M under a standing plan weak (2026-W39)

Chief Financial Officer Jason Child filed 1 sale line on 2026-09-21 (filed 2026-09-23), totaling 10,400 shares for about $3.12M (event 0001973239-26-000136:0), disclosed as a Rule 10b5-1 plan transaction. Continues the recurring pattern of scheduled disposals seen in prior weeks.

Filing timeline

FiledActorEventSharesValue ($)Source
2026-09-23child-jasoninsider_sell10,4003,120,000filing
2026-08-31child-jasoninsider_sell10,4002,655,432filing
2026-05-15coatue13f_exit00filing
2026-05-15altimeter13f_new1,715,440259,511,763filing