Arm Holdings vs Micron Technology (ARM vs MU)
Side by side from their SEC filings: revenue, margins, growth, returns and valuation, plus short interest, insider activity and institutional ownership.
Micron Technology is the larger company by revenue ($133.2B vs $4.9B) and market value ($994.3B vs $243.3B). Micron Technology has grown revenue faster over the last 4 fiscal years (+333.0% cumulative vs +82.0%). Micron Technology runs the higher operating margin (74.6% vs 18.3%). Micron Technology trades at the lower trailing P/E (11.8x vs 234.8x).
About Arm Holdings
Arm Holdings plc designs, develops, and licenses high-performance, energy-efficient semiconductor technology, including CPU and GPU intellectual property, system IP, and compute subsystems. The company serves technology companies worldwide by providing a compute platform used in devices ranging from smartphones and PCs to data centers, automotive systems, and IoT devices. In 2026, Arm expanded its offerings to include production silicon products with the launch of the Arm AGI CPU.
About Micron Technology
Micron Technology Inc produces memory and storage solutions including DRAM, NAND, and NOR semiconductor products. The company serves various markets such as data centers, mobile devices, automotive, industrial, and consumer electronics through its business units focused on cloud memory, core data center, mobile and client, and automotive and embedded segments. Its products include components, modules, solid state drives, managed NAND, and multi-chip packages designed for applications ranging from AI and high-performance computing to mobile and automotive uses.
Head to head (ARM FY2026 vs MU FY2026)
| Metric | ARMFY2026 | MUFY2026 |
|---|---|---|
| Revenue | $4.92B | $133.19B |
| Revenue growth (YoY) | 22.8% | 256.3% |
| Gross margin | — | 80.7% |
| Operating margin | 18.3% | 74.6% |
| Net margin | 18.4% | 63.8% |
| Net income | $904.0M | $84.97B |
| Diluted EPS | $0.85 | $74.33 |
| FCF margin | 19.9% | 44.3% |
| ROE | 10.9% | 61.4% |
| Long-term debt / equity | — | 0.03× |
| Market cap | $243.29B | $994.34B |
| P/E | 234.8× | 11.8× |
Fundamentals are from each company’s SEC filings (ARM FY2026, MU FY2026). ROE is net income over fiscal-year-end equity; long-term debt / equity counts non-current term debt only. P/E and market cap are derived from stored market prices, last retrieved on a rolling basis and typically within the past week.
Five-year trend (as reported)
| Revenue | FY2022 | FY2023 | FY2024 | FY2025 | FY2026 |
|---|---|---|---|---|---|
| ARM | $2.70B | $2.68B | $3.23B | $4.01B | $4.92B |
| MU | $30.76B | $15.54B | $25.11B | $37.38B | $133.19B |
Peer standing
Where each company ranks among the 89 semiconductor companies, on the same scale. Each figure is ranked only against peers that report it. Percentiles describe position in the distribution, not a rating.
| Metric | ARM | MU |
|---|---|---|
| Operating margin | 18.3%80th percentile of 80 | 74.6%Highest of 80 |
| Net margin | 18.4%81st percentile of 81 | 63.8%Highest of 81 |
| FCF margin | 19.9%78th percentile of 79 | 44.3%96th percentile of 79 |
| Revenue growth (YoY) | +22.8%64th percentile of 88 | +256.3%97th percentile of 88 |
| ROE | 10.9%72nd percentile of 76 | 61.4%99th percentile of 76 |
| P/E | 234.8×98th percentile of 43 | 11.8×10th percentile of 43 |
| Short interest (days to cover) | 2.30d27th percentile of 89 | 1.06d5th percentile of 89 |
Short interest
| FINRA settlement data | ARM | MU |
|---|---|---|
| Shares sold short | 16.2M | 26.0M |
| Change vs prior settlement | +4.3% | -5.8% |
| Days to cover | 2.30 | 1.06 |
| As of settlement | 2026-09-30 | 2026-09-30 |
Source: FINRA Consolidated Short Interest. FINRA is the owner and source of the FINRA-supplied data; republishing or redistributing it is not permitted. Not presented as a percentage of float. No FINRA endorsement of this product is implied.
Insider activity (last 90 days)
| Form 4 activity (codes P/S) | ARM | MU |
|---|---|---|
| Buys | 0 | 0 |
| Sells | 2 ($5.8M) | 99 ($96.8M) |
Non-derivative purchases (code P) and sales (code S) reported on SEC Form 4, which may be open-market or private (grants, exercises and tax withholding excluded). For context, about 15% of covered companies saw any reported insider purchase (code P) in a 90-day window.
Held by the same investors
9 tracked 13F managers hold both Arm Holdings and Micron Technology as of their latest quarterly filings: Altimeter Capital Management, Bridgewater Associates, Citadel Advisors, D. E. Shaw, Gotham Asset Management, Maverick Capital, Millennium Management, Sands Capital Management, Two Sigma Investments. See which superinvestors hold your own portfolio with the smart money checker.
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Data sourced from SEC EDGAR. Figures are as-reported and may be unaudited or restated; verify against the source filings before relying on them. Comparisons are descriptive (higher or lower on a reported figure), not a rating or a recommendation. Informational only. Not investment advice.