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ARM

Arm Holdings PLC /Uk
$300.43 -21.81 (-6.77%) At close · Jul 7
Market Cap
$320.88B
Shares
1,068,078,760

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 763
Total Value: $21,472,155,780
Total Shares: 141,327,094
Showing 1–100 of 829 holdings by value · page 1 of 9

Institutional Ownership Trend

12 quarters

Holder Concentration

Across 757 13F filers
Top Holder
11.8%
Sep 2023 → Mar 2026 · range 7.4% – 21.1%
of institutional value
Top 5
33.2%
Sep 2023 → Mar 2026 · range 31.0% – 45.3%
of institutional value
Top 10
47.6%
Sep 2023 → Mar 2026 · range 47.6% – 61.2%
of institutional value
HHI
344
Sep 2023 → Mar 2026 · range 316 – 688
Broadly held
Showing 100 of 829
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1973239 CUSIP 042068205 13F (30d) 29 filings 25 filers Visit website Investor relations