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ARM · MU in the 13F filings

Two to four stocks side by side among the 95 tracked managers: who lists them, how that has moved, who bought and sold in a quarter, and which managers hold more than one.

ARMMU
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

Holders over time

Tracked managers listing each stock every quarter, at least, or their combined reported value. A gap is a quarter in which no tracked manager listed it. Click a quarter to compare there.
  • ARM
  • MU
0204060202120222023202420252026
Holders and value by quarter
QuarterARMMU
Q3 2020none listed holders, n.a.34 holders, $8.6bn
Q4 2020none listed holders, n.a.43 holders, $13.3bn
Q1 2021none listed holders, n.a.38 holders, $13.5bn
Q2 2021none listed holders, n.a.38 holders, $11.4bn
Q3 2021none listed holders, n.a.28 holders, $8.6bn
Q4 2021none listed holders, n.a.34 holders, $12.8bn
Q1 2022none listed holders, n.a.32 holders, $10.8bn
Q2 2022none listed holders, n.a.31 holders, $7.8bn
Q3 2022none listed holders, n.a.36 holders, $7.1bn
Q4 2022none listed holders, n.a.26 holders, $8.0bn
Q1 2023none listed holders, n.a.28 holders, $10.0bn
Q2 2023none listed holders, n.a.34 holders, $10.8bn
Q3 202319 holders, $836m33 holders, $11.6bn
Q4 20235 holders, $413m35 holders, $14.4bn
Q1 202412 holders, $1.7bn45 holders, $19.9bn
Q2 202411 holders, $1.6bn43 holders, $20.8bn
Q3 202410 holders, $1.1bn39 holders, $12.9bn
Q4 202411 holders, $984m28 holders, $12.2bn
Q1 202511 holders, $1.1bn28 holders, $13.8bn
Q2 20259 holders, $2.5bn32 holders, $22.0bn
Q3 202512 holders, $2.1bn36 holders, $29.9bn
Q4 202513 holders, $2.1bn41 holders, $54.0bn
Q1 202613 holders, $2.9bn45 holders, $56.5bn
Q2 202617 holders, $12.2bn50 holders, $164bn
ARM

Arm Holdings PLC

Holders
11
Reported value
$1.1bn
Buyers
5
Sellers
7

Breadth -2 among 95 comparable managers.

SemiconductorsAI infrastructure and semiconductors · L3VLUPSemiconductors
MU

Micron Technology Inc

Holders
28
Reported value
$13.8bn
Buyers
17
Sellers
13

Breadth +4 among 95 comparable managers.

SemiconductorsAI infrastructure and semiconductors · L3VLUPSemiconductors

Who holds both, Q1 2025

Among the 36 tracked managers listing any of them. "Only" is about listed positions: a manager may hold the other below its listed range.

Only ARM (8)

Acadian Asset Management LLC, Altimeter Capital Management LP, Artisan Partners LP, Caxton Associates LLP, Elliott Investment Management LP, Man Group PLC, Quantbot Technologies LP, Verition Fund Management LLC

Only MU (25)

AllianceBernstein LP, Appaloosa LP, Balyasny Asset Management LLC, Capital Research Global Investors, Davidson Kempner Capital Management LP, Eisler Capital Management Ltd, ExodusPoint Capital Management LP, Fidelity (FMR LLC), Freestone Grove Partners LP, Hudson Bay Capital Management LP, Invesco Ltd, Jane Street Group LLC, Janus Henderson Group Ltd, Maverick Capital Ltd, Millennium Management LLC, Neuberger Berman Group LLC, Rokos Capital Management LLP, Schonfeld Strategic Advisors LLC, Squarepoint Ops LLC, Susquehanna International Group LLP, T. Rowe Price Associates Inc, Tudor Investment Corp, Walleye Capital LLC, Winton Group Ltd, Woodline Partners LP

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. Buyers and sellers count comparable managers (those that filed both quarters) by shares, so a rise in value with no rise in shares is the price. Large books are listed to their largest positions. These are 95 tracked managers, not the institutional market.

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