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ARM Institutional Ownership & 13F Holders | SmartMoneyDB

ARMARM HOLDINGS PLC

Smart Money Ownership

Of the 16 tracked institutions holding ARM, 11 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +4.6pt. It's a gauge of who owns the name, not just how many.

Stanley Druckenmiller

$10.0M · 0.2% of book

ARM (ARM HOLDINGS PLC) Institutional Ownership Summary

Among the 16 tracked institutional investors we monitor, ARM (ARM HOLDINGS PLC) is held with a combined value of $4.57B across 13,393,293 shares. The largest holder is FMR LLC with a position worth $1.44B (0.06% of their portfolio). 3 funds opened new positions in the most recent quarter. 5 funds increased their holdings. 8 funds reduced their position.

Total Institutional Value

$4.57B

Total Shares Held

13,393,293

Institutional Holders

% of Shares Outstanding

1.3%

of 1.06B shares · SEC 2026-03-31

Days to Cover

4.1+8.3%

18.26M shares short · FINRA 2026-08-14

Tracked 13F institutions hold 1.3% of ARM's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-03-31), not a live float.

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

FMR LLC+66% shares~$572.2M BlackRock, Inc.+64% shares~$281.2M PRICE T ROWE ASSOCIATES INC /MD/+46% shares~$79.9M TWO SIGMA ADVISERS, LP+361% shares~$61.0M STATE STREET CORP+29% shares~$28.3M

13F Institutional Holders

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FMR LLC

0.06% of book+65.9%

$1.44B

Capital Research Global Investors

Altimeter Capital Management, LP

5.92% of book-4.3%

$582.19M

WELLINGTON MANAGEMENT GROUP LLP

0.05% of book-51.1%

$287.01M

PRICE T ROWE ASSOCIATES INC /MD/

TWO SIGMA ADVISERS, LP

#	Fund	Value↓	Shares	Portfolio %	Change
1	FMR LLC	$1.44B	4,062,977	0.06%	+65.9%
2	Capital Research Global Investors	$851.37M	2,401,422	0.12%	-43.1%
3	BlackRock, Inc.	$721.90M	2,035,975	0.01%	+63.8%
4	Altimeter Capital Management, LP	$582.19M	1,641,972	5.92%	-4.3%
5	WELLINGTON MANAGEMENT GROUP LLP	$287.01M	809,451	0.05%	-51.1%
6	PRICE T ROWE ASSOCIATES INC /MD/	$255.03M	719,274	0.03%	+45.6%
7	BAILLIE GIFFORD & CO	$156.49M	441,365	0.14%	-27.9%
8	STATE STREET CORP	$127.45M	359,440	0.00%	+28.5%
9	TWO SIGMA ADVISERS, LP	$77.84M	712,100	0.15%	+361.2%
10	CITADEL ADVISORS LLC	$59.47M	167,727	0.03%	-41.9%

Congress Trading

2 members · 4 disclosed trades in ARM

Member	Type	Amount	Date
Cleo Fields	Sell	$50,001 - $100,000	Dec 11, 2025
Jonathan Jackson	Sell	$1,001 - $15,000	Sep 2, 2025
Jonathan Jackson	Buy	$1,001 - $15,000	Jul 17, 2025
Cleo Fields	Buy	$50,001 - $100,000

Frequently Asked Questions

Which institutional investors own the most ARM stock?

As of the latest SEC 13F filings, FMR LLC is the largest institutional holder of ARM with a position worth $1.44B, representing 0.06% of their portfolio. In total, 16 institutional investors hold ARM with a combined value of $4.57B.

Are hedge funds buying or selling ARM?

In the most recent quarter, 3 funds opened a new position in ARM. Additionally, 5 increased their holdings and 8 reduced their positions.

What percentage of ARM is owned by institutional investors?

Institutional investors hold $4.57B worth of ARM stock across 16 positions. The largest institutional holder is FMR LLC with $1.44B in holdings.

What is a 13F filing and why does it matter for ARM?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For ARM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track ARM institutional moves

Get notified when hedge funds change their ARM positions.