Largest Companies by Market Cap - October 2025
How these values were calculated
- Reconstructed, not recorded
- The share counts in force at the close of October 2025 were not recorded at the time. Each value marked est. is that month's closing price multiplied by the share count on record today, so a buyback or an issuance since then moves it. The closing prices are exact; the share counts are today's.
- What that changes
- Ranks near each other can swap, and a company whose share count changed sharply since October 2025 carries the largest error. Months recorded while their inputs were current carry no marker.
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What changed in this ranking
AI-generated summary by Rhea-AI, written on . How Rhea-AI works.
Micron Technology, Inc. (MU) was the standout climber, rising 22 places to rank 40 from rank 62. The semiconductor group was a notable source of upward movement: Intel Corp (INTC) and Advanced Micro Devices (AMD) climbed alongside MU. Arm Holdings (ARM) rose 18 places to rank 72 from rank 90. Intuitive Surgical Inc. (ISRG) gained 17 places to rank 68 from rank 85. Lam Research Corp (LRCX) advanced 16 places to rank 61 from rank 77.
AT&T (T) and Progressive Corporation (PGR) were the sharpest fallers, each dropping 20 places. Texas Instruments Incorporated (TXN) declined 19 places to rank 95 from rank 76. Verizon Communications Inc. (VZ) fell 15 places to rank 81 from rank 66. Linde plc (LIN) fell 14 places to rank 64 from rank 50. Boeing Company (BA) slipped 13 places to rank 85 from rank 72.
At the top of the ranking, Apple Inc. (AAPL) passed Microsoft Corp (MSFT) in the top 10. AAPL rose 1 place to rank 2. MSFT fell 1 place to rank 3. Tesla, Inc. (TSLA) and Broadcom Inc. (AVGO) each passed Meta Platforms, Inc. (META) in the top 10. META fell 2 places to rank 8.
Mr. Cooper Group Inc. (COOP) left the ranking. The comparison covers the close of October 2025 and the close of September 2025, with both periods reconstructed.
Compares this month's close with the previous month's close. A company that shifted only because another entered or left the ranking above it is not counted as having moved.