ARM — ARM HOLDINGS PLC

Ownership history in OPPENHEIMER & CO INC  ·  9 quarters on record

AI Ownership Summary

OPPENHEIMER & CO INC reported ARM HOLDINGS PLC (ARM) in 9 quarterly 13F filings from 2023 Q3 through 2025 Q3. Peak portfolio weight reached 0.15% in 2024 Q2. The latest visible filing shows ARM at 0.07% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this ARM ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was OPPENHEIMER & CO INC's position in ARM HOLDINGS PLC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q3

ARM was reported at 0.07% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.15% in 2024 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q3 to 2025 Q3

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

ARM stock page OPPENHEIMER & CO INC fund profile OPPENHEIMER & CO INC full holdings
How OPPENHEIMER & CO INC held ARM — position size vs. price
% of Fund (quarterly)    ARM price (quarter-end, indexed to 100)
📋 Quarterly Holdings History 9 quarters  ▾
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q3 ADDED 42,602 +125 +0.3% 0.07% $6.0M 2025-11-06 $158.25
2025 Q2 ADDED 42,477 +999 +2.4% 0.09% $6.9M 2025-07-31 $141.38
2025 Q1 REDUCED 41,478 -12,306 -22.9% 0.07% $4.4M 2025-04-23 $105.16
2024 Q4 REDUCED 53,784 -6,830 -11.3% 0.10% $6.6M 2025-02-05 $173.26
2024 Q3 ADDED 60,614 +2,417 +4.2% 0.13% $8.7M 2024-11-05 $140.65
2024 Q2 ADDED 58,197 +41,948 +258.2% 0.15% $9.5M 2024-08-08 $118.43
2024 Q1 ADDED 16,249 +911 +5.9% 0.03% $2.0M 2024-05-07 $107.80
2023 Q4 ADDED 15,338 +10,492 +216.5% 0.02% $1.2M 2024-02-13 $119.98
2023 Q3 INITIATED 4,846 — — 0.01% $259K 2023-11-08 $54.40

🏢 Other funds also holding ARM

As of 2025 Q4 — sorted by position size

Alphabet Inc. 3Y 8.31% Hyperion Asset Management Ltd 3Y 5.61% Renaissance Capital LLC 3Y 5.5% LANSDOWNE PARTNERS (UK) LLP 3Y 7Y 3.78% Defender Capital, LLC. 3Y 3.57% Longitude (Cayman) Ltd. 3Y 2.83% TRAN CAPITAL MANAGEMENT, L.P. 3Y 7Y 2.48% Longitude (Cayman) Ltd. 3Y 2.36% DOCK STREET ASSET MANAGEMENT INC 3Y 7Y 2.17% MARK ASSET MANAGEMENT LP 3Y 7Y 2.06%

FAQ About OPPENHEIMER & CO INC and ARM

These are the practical questions this page is built to answer before you even open the full history table.

How long has OPPENHEIMER & CO INC reported owning ARM?

OPPENHEIMER & CO INC reported ARM across 9 quarterly 13F filings, from 2023 Q3 through 2025 Q3.

What was the largest reported ARM position in OPPENHEIMER & CO INC's portfolio?

The largest reported portfolio weight for ARM was 0.15% in 2024 Q2.

What is the latest reported ARM position on this page?

The most recent filing on this page is 2025 Q3, when OPPENHEIMER & CO INC reported 42,602 shares, equal to 0.07% of portfolio, with an estimated market value of $6.0M.

What does the chart on this ARM ownership page compare?

The chart compares OPPENHEIMER & CO INC's quarterly ARM portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

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