The FTSE 100 represents about what percentage by market cap of all British public companies?

The FTSE 100 represents roughly 80% of the total market cap of all public British companies.

What are the largest biotech companies by market cap?

The largest three biotech companies by market cap are Eli Lilly, Johnson & Johnson (NYSE:JNJ), and AbbVie (NYSE:ABBV).

What are the largest U.S. companies by market cap?

As of October 2026, the biggest U.S. companies by market cap were Nvidia, Apple, and Alphabet (Google).

The Largest Companies by Market Cap in October 2026

Nvidia, Apple, and Alphabet are the biggest companies by market cap

By Lyle Daly – Updated Oct 5, 2026 at 11:42 AM EST | Fact-checked by Frank Bass

+Fool.comon

Key Points

Nvidia leads as the world's most valuable company at $5.65 trillion market cap.
AI's significance is underscored by its extensive use in top companies like Nvidia and Apple.
Investing in large-cap stocks like Nvidia offers both stability and substantial return potential.

Nvidia (NVDA -0.52%) is the world's largest company by market cap, followed by Apple (AAPL -1.11%) and Alphabet (GOOG +0.87%)(GOOGL +0.97%). The impact of AI is evident among the largest companies, as most of the top 10 are investing in it or involved in AI infrastructure. Read on to see the 20 most valuable companies as of October 2026.

Editors note: Rankings and financial metrics are as of Oct. 2, 2026; live quote cards update automatically and are the most current data available.

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An aerial shot of data centers. — Image source: Getty Images.

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Largest companies by market cap

Ticker Information Table
Name and ticker	Market capMarket cap calculated using publicly traded shares outstanding only. Does not include unlisted, private, or dual-class non-traded shares. Implied market cap may vary.	Current price	Sector
Nvidia (NASDAQ:NVDA)	$5.6 trillion	$229.28	Information Technology
Apple (NASDAQ:AAPL)	$5.0 trillion	$336.64	Information Technology
Alphabet (NASDAQ:GOOG)	$4.2 trillion	$347.86	Communication Services
Microsoft (NASDAQ:MSFT)	$3.9 trillion	$535.07	Information Technology
Amazon (NASDAQ:AMZN)	$2.7 trillion	$262.43	Consumer Discretionary
Taiwan Semiconductor Manufacturing (NYSE:TSM)	$2.4 trillion	$453.31	Information Technology
Space Exploration Technologies (NASDAQ:SPCX)	$2.2 trillion	$162.57	Communication Services
Meta Platforms (NASDAQ:META)	$1.8 trillion	$718.67	Communication Services
Broadcom (NASDAQ:AVGO)	$1.7 trillion	$361.54	Information Technology
Saudi Arabian Oil (SASE:2222)	$0.0 thousand	SAR 25.74	Energy
Tesla (NASDAQ:TSLA)	$1.5 trillion	$382.70	Consumer Discretionary
SK Hynix (NASDAQ:SKHY)	$1.2 trillion	$169.03	Information Technology
Samsung Electronics (OTC:SSNLF)	$919.3 billion	$139.76	Information Technology
Micron Technology (NASDAQ:MU)	$1.2 trillion	$1,029.00	Information Technology
Berkshire Hathaway (NYSE:BRKA)	$1.1 trillion	$774,295.00	Financials
Advanced Micro Devices (NASDAQ:AMD)	$1.0 trillion	$608.10	Information Technology
Eli Lilly (NYSE:LLY)	$1.1 trillion	$1,179.27	Health Care
JPMorgan Chase (NYSE:JPM)	$881.0 billion	$332.99	Financials
Walmart (NASDAQ:WMT)	$877.2 billion	$111.35	Consumer Staples
ASML (NASDAQ:ASML)	$682.1 billion	$1,780.34	Information Technology

Data as of Oct 9, 2026. Showing 20 of 20 total entries.

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1. Nvidia

NASDAQ: NVDA

Nvidia

Premium Feature

Moneyball Superscore

95/100

Today's Change

(-0.52%) $-1.20

Current Price

$229.28

Key Data Points

Market Cap

$5.6T

Day's Range

$229.11 - $233.92

52wk Range

$164.27 - $243.37

Volume

84.5M

Avg Vol

121.5M

Gross Margin

74.67%

Dividend Yield

0.23%

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Market cap: $5.65 trillion (as of Oct. 2)
Revenue (TTM): $303.0 billion
Gross profit (TTM): $226.2 billion
Five-year annualized return: 62.35%
Year founded: 1993

Tech company Nvidia designs and develops graphics processing units (GPUs) originally used for PC graphics and video games. Its GPUs are in high demand from AI companies because they play a key role in training and operating large language models (LLMs). They've also been used for mining cryptocurrency (using computer processing power to validate crypto transactions and earn rewards).

Thanks to the AI boom, Nvidia is currently the most valuable company in the world and was the first to reach a market cap of $5 trillion.

2. Apple

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NASDAQ: AAPL

Apple

Premium Feature

Moneyball Superscore

88/100

Today's Change

(-1.11%) $-3.78

Current Price

$336.64

Key Data Points

Market Cap

$5.0T

Day's Range

$330.70 - $338.61

52wk Range

$243.42 - $345.34

Volume

37.9M

Avg Vol

45.3M

Gross Margin

48.65%

Dividend Yield

0.31%

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Market cap: $4.87 trillion (as of Oct. 2)
Revenue (TTM): $466.8 billion
Gross profit (TTM): $227.1 billion
Five-year annualized return: 18.53%
Year founded: 1976

Tech giant Apple built its success on sales of its wildly popular products, including the iPhone, MacBook, and AirPods. It has branched out into services, including Apple TV+. It also developed Apple Intelligence, an AI technology. It should be noted that, as of 2026, Apple was outsourcing some of its Apple Intelligence to Google.

3. Alphabet

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NASDAQ: GOOGL

Alphabet

Premium Feature

Moneyball Superscore

93/100

Today's Change

(0.97%) $3.37

Current Price

$351.66

Key Data Points

Market Cap

$4.3T

Day's Range

$350.31 - $354.70

52wk Range

$235.84 - $408.61

Volume

17.3M

Avg Vol

26.9M

Gross Margin

60.94%

Dividend Yield

0.25%

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Market cap: $4.20 trillion (as of Oct. 2)
Revenue (TTM): $445.9 billion
Gross profit (TTM): $271.5 billion
Five-year annualized return: 20.26%
Year founded: 1998 (Google), 2015 (Alphabet)

Alphabet is the holding company formed through Google's 2015 restructuring. Of course, Google is best known as a search engine, so famous that the name is synonymous with online searches. That's just one of Alphabet's many widely used products, which also include:

Email service Gmail
Video site YouTube
Navigation apps Waze and Maps
Pixel smartphones

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4. Microsoft

NASDAQ: MSFT

Microsoft

Premium Feature

Moneyball Superscore

93/100

Today's Change

(2.38%) $12.46

Current Price

$535.07

Key Data Points

Market Cap

$3.9T

Day's Range

$526.24 - $537.22

52wk Range

$349.20 - $553.72

Volume

18.5M

Avg Vol

27.7M

Gross Margin

67.94%

Dividend Yield

0.70%

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Market cap: $3.84 trillion (as of Oct. 2)
Revenue (TTM): $331.8 billion
Gross profit (TTM): $225.5 billion
Five-year annualized return: 12.35%
Year founded: 1975

Considering the popularity of the Windows operating system, it's no surprise that Microsoft (MSFT +2.38%) has consistently ranked as one of the largest companies in the world. Over 75% of computers use Windows, according to Statcounter. While it's best known for Windows, Microsoft offers a diverse product line, including the Office Suite, the Azure cloud platform, and Xbox video game consoles.

Microsoft has been making a big push into AI technology. It launched an AI-powered digital assistant, Microsoft Copilot, and is estimated to spend $175 billion on capital expenditures in 2026. It has partnered with OpenAI since 2019 and holds a roughly 27% stake in the AI company.

5. Amazon

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NASDAQ: AMZN

Amazon

Premium Feature

Moneyball Superscore

90/100

Today's Change

(3.29%) $8.37

Current Price

$262.43

Key Data Points

Market Cap

$2.7T

Day's Range

$256.00 - $262.80

52wk Range

$196.00 - $287.20

Volume

34.7M

Avg Vol

39.2M

Gross Margin

50.77%

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Market cap: $2.71 trillion (as of Oct. 2)
Revenue (TTM): $775.7 billion
Gross profit (TTM): $393.8 billion
Five-year annualized return: 8.91%
Year founded: 1994

E-commerce leader Amazon (AMZN +3.29%) began as an online bookstore, which illustrates just how far its reach has expanded. It's now the site where you can buy practically anything. It's the largest online retailer in the world and the leading company in terms of revenue.

The company’s Amazon Prime service has more than 200 million users worldwide. It's also the largest cloud provider in the world with Amazon Web Services (AWS), and that's only the tip of the iceberg. Amazon offers its Amazon Prime Video streaming service and Twitch video game streaming, in addition to owning the Whole Foods Market grocery chain.

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6. Taiwan Semiconductor Manufacturing

NYSE: TSM

Taiwan Semiconductor Manufacturing

Premium Feature

Moneyball Superscore

97/100

Today's Change

(-1.02%) $-4.68

Current Price

$453.31

Key Data Points

Market Cap

$2.4T

Day's Range

$449.75 - $464.83

52wk Range

$266.82 - $487.47

Volume

9.2M

Avg Vol

11.3M

Gross Margin

63.08%

Dividend Yield

0.82%

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Market cap: $2.45 trillion (as of Oct. 2)
Revenue (TTM): $139.5 billion*
Gross profit (TTM): $89.6 billion*
Five-year annualized return: 33.48%
Year founded: 1987

*Converted from New Taiwan dollars.

Taiwan Semiconductor Manufacturing (TSM -1.02%), also known as TSMC, is a leader in semiconductor production and is Taiwan's most valuable company. As such, it works with many of the leading global technology companies, including Apple and Nvidia. It's another tech company benefiting from AI's growth. It's the largest contract chip manufacturer in the world, and demand for AI chips has led to increased sales for TSMC.

TSMC is expanding its semiconductor manufacturing operations in the U.S. It has announced plans to invest $265 billion in U.S. fabrication plants, advanced packaging facilities, and a research and development team center.

7. Space Exploration Technologies

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NASDAQ: SPCX

Space Exploration Technologies

Today's Change

(1.25%) $2.00

Current Price

$162.57

Key Data Points

Market Cap

$2.2T

Day's Range

$160.61 - $166.38

52wk Range

$104.83 - $225.64

Volume

92.7M

Avg Vol

92.3M

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Market cap: $2.09 trillion (as of Oct. 2)
Revenue (TTM): $23.0 billion
Gross profit (TTM): $12.0 billion
Year founded: 2002

Space Exploration Technologies (SPCX +1.25%), more commonly known as SpaceX, is a space, telecommunications, and AI company. CEO Elon Musk founded the company to make spaceflight more affordable, and SpaceX now has an 80% market share in the commercial space launch industry.

SpaceX acquired xAI, another Musk-owned company that includes X (formerly Twitter), in February 2026. SpaceX went public in June 2026 with the largest IPO in history.

8. Meta Platforms

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NASDAQ: META

Meta Platforms

Premium Feature

Moneyball Superscore

78/100

Today's Change

(-0.31%) $-2.22

Current Price

$718.67

Key Data Points

Market Cap

$1.8T

Day's Range

$716.20 - $728.07

52wk Range

$520.26 - $779.82

Volume

12.6M

Avg Vol

19.2M

Gross Margin

81.75%

Dividend Yield

0.29%

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Market cap: $1.86 trillion (as of Oct. 2)
Revenue (TTM): $228.3 billion
Gross profit (TTM): $186.6 billion
Five-year annualized return: 16.25%
Year founded: 2004

The company formerly known as Facebook rebranded as Meta Platforms (META -0.31%) in 2021. More recently, this social media company has been investing heavily in AI tools and infrastructure.

For now, Meta Platform's biggest products are its social networks, Facebook and Instagram. It also owns WhatsApp and Messenger and expanded into virtual reality with its Meta Quest devices and the acquisition of Oculus. Meta makes the vast majority of its money from advertising, which accounts for about 98% of its revenue.

9. Broadcom

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NASDAQ: AVGO

Broadcom

Premium Feature

Moneyball Superscore

91/100

Today's Change

(0.39%) $1.40

Current Price

$361.54

Key Data Points

Market Cap

$1.7T

Day's Range

$361.10 - $366.63

52wk Range

$289.96 - $495.00

Volume

16.8M

Avg Vol

22.4M

Gross Margin

66.54%

Dividend Yield

0.72%

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Market cap: $1.70 trillion (as of Oct. 2)
Revenue (TTM): $89.1 billion
Gross profit (TTM): $61.3 billion
Five-year annualized return: 48.77%
Year founded: 1961 (HP Associates), 2005 (Avago Technologies), 2016 (Broadcom Limited)

Broadcom (AVGO +0.39%) started out as HP Associates, HP's semiconductor division. It's now one of the largest semiconductor companies and develops custom chips for multiple hyperscalers.

In addition to its semiconductor business, Broadcom also has infrastructure software products. It significantly expanded its software division through the acquisition of VMware in November 2023.

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10. Saudi Arabian Oil

SASE: 2222

Saudi Arabian Oil

Today's Change

(-0.39%) $-0.10

Current Price

$25.74

Key Data Points

Day's Range

$25.72 - $26.04

52wk Range

$23.29 - $27.96

Volume

13.6M

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Market cap: $1.64 trillion* (as of Oct. 2)
Revenue (TTM): $485.8 billion*
Gross profit (TTM): $250.0 billion*
Five-year annualized return: -3.25%
Year founded: 1933

*Converted from Saudi riyals.

Saudi Arabian Oil, also known as Saudi Aramco, is an energy and chemicals company. Owned by the Saudi Arabian government, it has the largest daily oil production and the second-largest proven crude oil reserves of all oil companies.

Saudi Aramco signed a joint development agreement with China's BYD Company, the world's largest electric vehicle (EV) manufacturer by sales volume, in April 2025. The company's Jafurah project, reportedly the largest shale natural gas development outside the U.S., started production in December 2025.

11. Tesla

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NASDAQ: TSLA

Tesla

Premium Feature

Moneyball Superscore

65/100

Today's Change

(2.05%) $7.70

Current Price

$382.70

Key Data Points

Market Cap

$1.5T

Day's Range

$379.71 - $388.56

52wk Range

$297.38 - $498.83

Volume

38.9M

Avg Vol

37.5M

Gross Margin

18.85%

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Market cap: $1.46 trillion (as of Oct. 2)
Revenue (TTM): $103.6 billion
Gross profit (TTM): $19.5 billion
Five-year annualized return: 7.48%
Year founded: 2003

Tesla (TSLA +2.05%) rode the growth of EVs to become the world's most valuable automaker. Its most popular vehicle, the Tesla Model Y, was also the best-selling car worldwide in 2023 and 2024.

Although Tesla is most famous for its vehicles, it made a major strategic shift in January 2026. CEO Elon Musk announced plans to discontinue production of the Model S and X as part of a greater focus on robotics, including the Tesla Optimus humanoid robot. In addition to EVs and robotics, Tesla manufactures solar energy products and owns and operates two charging networks: the Tesla Supercharger network and the Destination Charging network.

12. SK Hynix

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NASDAQ: SKHY

SK Hynix

Today's Change

(-0.86%) $-1.47

Current Price

$169.03

Key Data Points

Market Cap

$1.2T

Day's Range

$168.77 - $173.30

52wk Range

$124.80 - $199.87

Volume

12M

Avg Vol

28.3M

Gross Margin

75.63%

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Market cap: $1.39 trillion (as of Oct. 2)
Revenue (TTM): $189.2 billion
Gross profit (TTM): $144.3 billion
Year founded: 1983 (Hyundai Electronics), 2001 (Hynix), 2012 (SK Hynix)

SK Hynix is a memory company and one of the largest manufacturers of DRAM and NAND chips. It provides memory to many major tech companies, including Apple and Microsoft. Based in South Korea, SK Hynix made its U.S. stock market debut in July 2026.

13. Samsung

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OTC: SSNLF

Samsung Electronics

Today's Change

(0.00%) $0.00

Current Price

$139.76

Key Data Points

Market Cap

$919B

Day's Range

$139.76 - $139.76

52wk Range

$42.33 - $140.00

Volume

100

Gross Margin

56.61%

Dividend Yield

0.63%

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Market cap: $1.35 trillion* (as of Oct. 2)
Revenue (TTM): $361.2 billion*
Gross profit (TTM): $207.6 billion*
Five-year annualized return: 30.40%
Year founded: 1938

*Converted from South Korean won.

Samsung Electronics (SSNL.F +0.00%) is a South Korean consumer and industrial electronics company. It's known for the Galaxy smartphone and tablet lines, as well as TVs and wearables.

This electronics company is also one of the world's top memory chip manufacturers. Its high-bandwidth memory (HBM) products, in particular, have soared in popularity amid rising AI memory demands.

14. Micron Technology

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NASDAQ: MU

Micron Technology

Premium Feature

Moneyball Superscore

91/100

Today's Change

(-0.66%) $-6.84

Current Price

$1,029.00

Key Data Points

Market Cap

$1.2T

Day's Range

$1017.00 - $1054.17

52wk Range

$179.61 - $1255.00

Volume

19.9M

Avg Vol

32.8M

Gross Margin

85.86%

Dividend Yield

0.04%

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Market cap: $1.21 trillion (as of Oct. 2)
Revenue (TTM): $90.3 billion
Gross profit (TTM): $65.5 billion
Five-year annualized return: 72.20%
Year founded: 1978

Along with Samsung and SK Hynix, Micron Technology (MU -0.66%) is one of the "Big Three" memory companies -- and the only one headquartered in the U.S. Micron manufactures DRAM, flash memory, and SSD memory products.

15. Berkshire Hathaway

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NYSE: BRKA

Berkshire Hathaway

Today's Change

(0.97%) $7,413.03

Current Price

$774,295.00

Key Data Points

Market Cap

$1.1T

Day's Range

$765962.00 - $774750.00

52wk Range

$698000.00 - $806102.81

Volume

208

Avg Vol

170.8

Gross Margin

23.52%

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Market cap: $1.08 trillion (as of Oct. 2)
Revenue (TTM): $438.3 billion
Five-year annualized return: 12.71%
Year founded: 1839

Berkshire Hathaway (BRK.A +0.97%)(BRK.B +0.89%) was the first U.S. company outside the tech sector to reach a $1 trillion market cap. It started as a textile company and remained in that business for more than a century, but it's perhaps most well-known for its ties to legendary investor Warren Buffett. He began investing in Berkshire in 1962, took majority control in 1965, and converted it into a holding company in 1970.

After serving as Berkshire's CEO for 60 years, Buffett retired at the end of 2025 and stepped down as board chairman in September 2026. While Berkshire's primary business is insurance (it owns one of the largest insurance companies, GEICO), it has also invested in companies across various industries.

16. Advanced Micro Devices

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NASDAQ: AMD

Advanced Micro Devices

Premium Feature

Moneyball Superscore

94/100

Today's Change

(-2.03%) $-12.58

Current Price

$608.10

Key Data Points

Market Cap

$1.0T

Day's Range

$606.00 - $627.37

52wk Range

$188.22 - $658.52

Volume

13.7M

Avg Vol

23.3M

Gross Margin

50.37%

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Market cap: $1.04 trillion (as of Oct. 2)
Revenue (TTM): $41.3 billion
Gross profit (TTM): $22.0 billion
Five-year annualized return: 43.98%
Year founded: 1969

Advanced Micro Devices (AMD -2.03%), also known as AMD, designs and manufactures high-performance computing products. Its products include the CPUs and GPUs used in AI data centers. AMD technology also powers the PlayStation and Xbox video game consoles.

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17. Eli Lilly

NYSE: LLY

Eli Lilly

Premium Feature

Moneyball Superscore

94/100

Today's Change

(0.83%) $9.67

Current Price

$1,179.27

Key Data Points

Market Cap

$1.1T

Day's Range

$1151.67 - $1179.82

52wk Range

$783.85 - $1292.65

Volume

1.4M

Avg Vol

2.5M

Gross Margin

83.40%

Dividend Yield

0.57%

Loading company_card...

Market cap: $1.02 trillion (as of Oct. 2)
Revenue (TTM): $79.7 billion
Gross profit (TTM): $66.4 billion
Five-year annualized return: 37.85%
Year founded: 1876

Founded by a chemist and Union Army veteran of the same name, Eli Lilly (LLY +0.83%) is one of the world's largest pharmaceutical companies. It was the first company to mass-produce insulin and the polio vaccine.

Eli Lilly's main revenue drivers are diabetes drugs and weight-loss medication, specifically Mounjaro and Zepbound. Its GLP-1 weight loss pill, Foundayo, received FDA approval on April 1, 2026. Eli Lilly also manufactures antidepressants, most notably Prozac, and donanemab, a treatment for Alzheimer's disease.

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18. JPMorgan Chase

NYSE: JPM

JPMorgan Chase

Premium Feature

Moneyball Superscore

74/100

Today's Change

(0.47%) $1.57

Current Price

$332.99

Key Data Points

Market Cap

$881B

Day's Range

$330.58 - $333.54

52wk Range

$279.10 - $366.50

Volume

5.1M

Avg Vol

7.4M

Dividend Yield

1.86%

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Market cap: $883.53 billion (as of Oct. 2)
Revenue (TTM): $194.9 billion
Five-year annualized return: 14.74%
Year founded: 1799 (Bank of the Manhattan Company), 2000 (merger of JPMorgan and Chase)

While there are several big banks in the U.S., JPMorgan Chase (JPM +0.47%) is the biggest. It managed $5.1 trillion in assets as of the second quarter of 2026, more than any other U.S. bank and the fifth-highest globally.

JPMorgan has launched multiple ventures in the growing cryptocurrency market. It partnered with Coinbase (COIN +4.30%), one of the leading crypto exchanges, in July. The partnership makes it easier for the bank's customers to invest in cryptocurrency. JPMorgan launched its own deposit token, JPMD, in June. The bank is also incorporating AI technology into its operations.

19. Walmart

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NASDAQ: WMT

Walmart

Today's Change

(0.71%) $0.79

Current Price

$111.35

Key Data Points

Market Cap

$877B

Day's Range

$109.93 - $111.51

52wk Range

$98.88 - $135.16

Volume

11.8M

Avg Vol

23.6M

Gross Margin

25.23%

Dividend Yield

0.88%

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Market cap: $827.17 billion (as of Oct. 2)
Revenue (TTM): $735.8 billion
Gross profit (TTM): $185.7 billion
Five-year annualized return: 17.94%
Year founded: 1962

Walmart (WMT +0.71%) is the world's second-largest retailer, having been surpassed only recently by Amazon. It still earns over $700 billion in annual revenue, more than most of the other companies on this list by a wide margin.

This retail giant is also notable for being the largest family-owned business. Brothers Sam and James "Bud" Walton founded the company, and the Walton family still owns more than 40% of it.

20. ASML

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NASDAQ: ASML

ASML

Premium Feature

Moneyball Superscore

97/100

Today's Change

(0.60%) $10.55

Current Price

$1,780.34

Key Data Points

Market Cap

$682B

Day's Range

$1778.00 - $1825.57

52wk Range

$935.41 - $1999.96

Volume

1.2M

Avg Vol

1.5M

Gross Margin

52.73%

Dividend Yield

0.51%

Loading company_card...

Market cap: $717.23 billion (as of Oct. 2)
Revenue (TTM): $39.8 billion*
Gross profit (TTM): $20.5 billion*
Five-year annualized return: 20.28%
Year founded: 1984

*Converted from euros.

ASML (ASML +0.60%) is a Dutch company that makes photolithography systems, which are instrumental in the development of semiconductors. It's notable as the only manufacturer of extreme ultraviolet (EUV) lithography machines used to produce the most advanced AI chips.

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Tech dominates, but sector diversity defines the top 20

Large-cap stocks like these are an important part of every investor's portfolio. They generally provide more safety and stability than smaller stocks, as most are established companies with strong brands.

The world's biggest companies span a wide range of businesses. The tech sector is the most well-represented, but there are plenty of companies from other sectors as well.

In addition to greater stability, large caps can also be highly profitable; 15 of the stocks on this list outperformed the S&P 500 over the past five years. Yet even with the world's biggest companies, no investment is a sure thing. A diversified portfolio is still crucial to avoid overreliance on any single company or market sector.

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The largest companies by sector

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FAQs

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About the Author

Lyle Daly is a contributing Motley Fool stock market analyst covering information technology and cryptocurrency. Lyle has been a contributor at the financial services company since 2018. His work has been featured on USA Today, Yahoo Finance, MSN, Fox Business, and Nasdaq. Before joining The Motley Fool, he wrote for financial brands including Intuit.

TMFLyleDaly

@LyleDaly

JPMorgan Chase is an advertising partner of Motley Fool Money. Lyle Daly has positions in ASML, Alphabet, Berkshire Hathaway, Broadcom, Meta Platforms, Nvidia, and Tesla. The Motley Fool has positions in and recommends ASML, Advanced Micro Devices, Alphabet, Amazon, Apple, Berkshire Hathaway, Broadcom, Eli Lilly, JPMorgan Chase, Meta Platforms, Micron Technology, Microsoft, Nvidia, Oracle, Taiwan Semiconductor Manufacturing, Tesla, and Walmart. The Motley Fool has a disclosure policy.

The Largest Companies by Market Cap in October 2026

Nvidia, Apple, and Alphabet are the biggest companies by market cap

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Largest companies by market cap

1. Nvidia

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2. Apple

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3. Alphabet

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4. Microsoft

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5. Amazon

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6. Taiwan Semiconductor Manufacturing

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7. Space Exploration Technologies

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8. Meta Platforms

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9. Broadcom

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10. Saudi Arabian Oil

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11. Tesla

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12. SK Hynix

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13. Samsung

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14. Micron Technology

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15. Berkshire Hathaway

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16. Advanced Micro Devices

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17. Eli Lilly

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18. JPMorgan Chase

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19. Walmart

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20. ASML

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Tech dominates, but sector diversity defines the top 20

Methodology

The largest companies by sector

Sources

FAQs

The FTSE 100 represents about what percentage by market cap of all British public companies?

The FTSE 100 represents about what percentage by market cap of all British public companies?

What are the largest biotech companies by market cap?

What are the largest biotech companies by market cap?

What are the largest U.S. companies by market cap?

What are the largest U.S. companies by market cap?

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Key Data Points

2. Apple

Key Data Points

3. Alphabet

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Key Data Points

5. Amazon

Key Data Points

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7. Space Exploration Technologies

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8. Meta Platforms