Largest Companies by Market Cap - September 2025
How these values were calculated
- Reconstructed, not recorded
- The share counts in force at the close of September 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 September 2025 carries the largest error. Months recorded while their inputs were current carry no marker.
Swipe or scroll the table sideways for more columns.
What changed in this ranking
AI-generated summary by Rhea-AI, written on . How Rhea-AI works.
The biggest gains were concentrated in semiconductor companies, led by Micron Technology, Inc. (MU) and Intel Corp (INTC), which each climbed 40 places. MU reached rank 62 from rank 102. INTC reached rank 74 from rank 114. Applied Materials, Inc. (AMAT) rose 24 places to rank 83 from rank 107.
Applovin Corporation (APP) climbed 37 places to rank 43 from rank 80. Lam Research Corp (LRCX) climbed 32 places to rank 77 from rank 109, extending the strong upward showing among semiconductor-related companies.
In the top 10, Tesla, Inc. (TSLA) rose 1 place to rank 7. TSLA moved ahead of Broadcom Inc. (AVGO) in the top 10. AVGO fell 1 place to rank 8.
The largest declines were led by S&P Global Inc. (SPGI), Texas Instruments Incorporated (TXN), and Danaher Corporation (DHR), all of which fell. SPGI fell 19 places to rank 97 from rank 78. TXN fell 15 places to rank 76 from rank 61. DHR fell 15 places to rank 105 from rank 90. The next notable declines came from Accenture plc (ACN) and Boeing Company (BA), which both fell. ACN fell 13 places to rank 81 from rank 68. BA fell 12 places to rank 72 from rank 60.
The rankings for
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.
About this ranking
This page ranks 944 US-listed companies by the market capitalization each one carried at the close of September 2025. The values do not change, because September 2025 is over; this is what the ranking looked like then, and it will look the same the next time you visit.
Market capitalization is the share price multiplied by the number of shares outstanding. Each figure on this page uses that month's closing share price, so the ranking reflects the market as it stood at the close of September 2025 rather than today. Rank Change compares each company's position with its position at the end of the previous month. A company whose position shifted only because another company entered or left the ranking above it shows no change, because it did not move.
This month was reconstructed: the closing prices are the ones recorded for September 2025, but the share counts are today's, so every value marked est. carries the share-count drift since then.
For the ranking at today's prices, see the live market cap ranking.