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ARM · Arm Holdings PLC /Uk

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$243.32 -7.40 (-2.95%) At close · Aug 21
Market Cap
$259.87B
Shares
1.07B

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.

Holders: 980
Total Value: $55,140,862,368
Total Shares: 155,515,911

Institutional Ownership Trend

12 quarters

Holder Concentration

Across 980 13F filers · Δ vs Mar 31, 2026
Top Holder
12.3%
Sep 2023 → Jun 2026 · range 7.4% – 20.9%
+0.6 pts
Top 5
37.8%
Sep 2023 → Jun 2026 · range 31.0% – 44.8%
+4.6 pts
Top 10
51.5%
Sep 2023 → Jun 2026 · range 47.6% – 60.7%
+3.9 pts
HHI
396
Sep 2023 → Jun 2026 · range 316 – 676
Broadly held+52

Quarterly Activity

vs Mar 31, 2026
New
321
Increased
290
Decreased
263
Sold Out
99
Unchanged
106
Holder count: +222
Institutional value: +158.7%
Shares held: +10.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,055
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1973239 CUSIP 042068205 13F (30d) 775 filings 770 filers Visit website Investor relations