Stock Ownership/ARM

ARM HOLDINGS PLC (ARM): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in ARM · Information Technology. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
28
13F filers
Aggregate Value
$3.3B
Across holders
Last Price
$238.78
2026-08-24
Sector
Information Technology
GICS
Quarterly fund activity14 increased14 reduced5 exited
Full exits: Point72 Asset Management, L.P., RENAISSANCE TECHNOLOGIES LLC, Qube Research & Technologies Ltd, Whale Rock Capital Management LLC, Parallax Volatility Advisers, L.P.
Institutional Holders of ARM
↗
28 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
Hedge Fund4.09M$1.5B44.0%0.6%Added+$1.1BQ2 2026
Altimeter Capital Management, LLC
CIK 0001541617
Hedge Fund1.64M$582.2M17.6%5.9%Reduced$-26.0MQ2 2026
LANSDOWNE PARTNERS (UK) LLP
CIK 0001608485
Hedge Fund1.07M$380.3M11.5%15.6%Added$-121.8MQ2 2026
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
Hedge Fund660K$234.1M7.1%0.2%Added+$205.1MQ2 2026
SANDS CAPITAL MANAGEMENT, LLC
CIK 0001020066
Institutional Manager643K$227.9M6.9%0.8%Added—Q2 2026
BAILLIE GIFFORD & CO
CIK 0001088875
Institutional Manager441K$156.5M4.7%0.1%Reduced$-109.6MQ2 2026
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
Institutional Manager234K$82.9M2.5%0.0%Reduced$-71KQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund168K$59.5M1.8%0.0%Reduced$-2.4BQ2 2026
Rockefeller Capital Management L.P.
CIK 0001739439
Hedge Fund155K$55.0M1.7%0.1%Added$-27.4MQ2 2026
Man Group plc
CIK 0001637460
Hedge Fund46K$16.5M0.5%0.0%Reduced$-18.8MQ2 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPAdded
Hedge Fund
$1.5B· 44.0% of total· 0.6% port· 4.09M sh· +$1.1B QoQ· Q2 2026
Altimeter Capital Management, LLCReduced
Hedge Fund
$582.2M· 17.6% of total· 5.9% port· 1.64M sh· $-26.0M QoQ· Q2 2026
LANSDOWNE PARTNERS (UK) LLPAdded
Hedge Fund
$380.3M· 11.5% of total· 15.6% port· 1.07M sh· $-121.8M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPAdded
Hedge Fund
$234.1M· 7.1% of total· 0.2% port· 660K sh· +$205.1M QoQ· Q2 2026
SANDS CAPITAL MANAGEMENT, LLCAdded
Institutional Manager
$227.9M· 6.9% of total· 0.8% port· 643K sh· — QoQ· Q2 2026
BAILLIE GIFFORD & COReduced
Institutional Manager
$156.5M· 4.7% of total· 0.1% port· 441K sh· $-109.6M QoQ· Q2 2026
PRIMECAP MANAGEMENT CO/CA/Reduced
Institutional Manager
$82.9M· 2.5% of total· 0.0% port· 234K sh· $-71K QoQ· Q2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$59.5M· 1.8% of total· 0.0% port· 168K sh· $-2.4B QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$55.0M· 1.7% of total· 0.1% port· 155K sh· $-27.4M QoQ· Q2 2026
Man Group plcReduced
Hedge Fund
$16.5M· 0.5% of total· 0.0% port· 46K sh· $-18.8M QoQ· Q2 2026
VOLORIDGE INVESTMENT MANAGEMENT, LLCAdded
Hedge Fund
$10.6M· 0.3% of total· 0.0% port· 30K sh· — QoQ· Q2 2026
Duquesne Family Office LLCReduced
Family Office
$10.0M· 0.3% of total· 0.2% port· 28K sh· $-27.9M QoQ· Q2 2026
FRED ALGER MANAGEMENT, LLCAdded
Hedge Fund
$9.8M· 0.3% of total· 0.0% port· 28K sh· — QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCReduced
Hedge Fund
$4.6M· 0.1% of total· 0.0% port· 13K sh· $-323.3M QoQ· Q2 2026
PineBridge Investments, L.P.Reduced
Hedge Fund
$4.0M· 0.1% of total· 0.0% port· 28K sh· $-2.2M QoQ· Q3 2025
CAPSTONE INVESTMENT ADVISORS, LLCAdded
Hedge Fund
$3.7M· 0.1% of total· 0.0% port· 10K sh· +$2.8M QoQ· Q2 2026
Walleye Capital LLCAdded
Hedge Fund
$3.0M· 0.1% of total· 0.0% port· 9K sh· $-6.1M QoQ· Q2 2026
Verition Fund Management LLCReduced
Hedge Fund
$2.5M· 0.1% of total· 0.0% port· 7K sh· +$179K QoQ· Q2 2026
SHAW D E & CO INCReduced
Hedge Fund
$2.0M· 0.1% of total· 0.0% port· 6K sh· $-40.1M QoQ· Q2 2026
Bridgewater Associates, LPReduced
Hedge Fund
$1.7M· 0.1% of total· 0.0% port· 5K sh· $-208.6M QoQ· Q2 2026
MAVERICK CAPITAL LTDAdded
Hedge Fund
$1.4M· 0.0% of total· 0.0% port· 4K sh· — QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$1.0M· 0.0% of total· 0.0% port· 3K sh· $-172.9M QoQ· Q2 2026
CAXTON ASSOCIATES LLPAdded
Hedge Fund
$752K· 0.0% of total· 0.0% port· 2K sh· — QoQ· Q2 2026
Schonfeld Strategic Advisors LLCReduced
Hedge Fund
$537K· 0.0% of total· 0.0% port· 2K sh· $-2.7M QoQ· Q2 2026
Ancora Advisors, LLCAdded
Hedge Fund
$358K· 0.0% of total· 0.0% port· 1K sh· +$100K QoQ· Q2 2026
Fisher Asset Management, LLCAdded
Institutional Manager
$336K· 0.0% of total· 0.0% port· 946 sh· — QoQ· Q2 2026
Gotham Asset Management, LLCAdded
Hedge Fund
$308K· 0.0% of total· 0.0% port· 868 sh· — QoQ· Q2 2026
Woodline Partners LPReduced
Hedge Fund
$212K· 0.0% of total· 0.0% port· 597 sh· $-263K QoQ· Q2 2026
1–10 of 28
1 / 3
Loading recent insider activity…
← Stock ownership