About this site

Market Cap Leaderboard combines the largest listed companies of Korea, the US, and Japan into a single ranking converted to Korean won. Different currencies and exchanges make questions like “where does Samsung Electronics rank globally?” hard to answer at a glance — this site answers them directly.

It also ships tools to play with the data — country battles, a what-if calculator, sector comparisons, weight classes — plus a detail page for every stock covering its rank, gaps to neighbors, and sector context.

Data sources

• 🇰🇷 Korea: KRX market cap data (FinanceDataReader), with Naver Finance as fallback — top 100 stocks by market cap
• 🇺🇸 US: Yahoo Finance — top 100 by market cap from the S&P 500 and large-cap candidates
• 🇯🇵 Japan: top 100 stocks by market cap listed on the Tokyo Stock Exchange (TSE)
• FX: USD/KRW and JPY/KRW market rates

Methodology

• Each stock's market cap is collected in its local currency, converted to KRW at market FX rates, and ranked on a single board.
• Rank changes (▲▼) are measured against the previous day's last snapshot.
• Shares outstanding are estimated as market cap divided by price and may differ from actual issued shares.
• A few private companies (marked as estimated valuations) are approximations based on publicly reported valuations.

Update cadence

An automated pipeline refreshes the data every hour. Because the three markets trade in different time zones, values at any given moment reflect each market's most recent close or live price.

Disclaimer

Everything on this site is for reference only and is not investment advice or a solicitation. Collection and conversion may introduce errors or delays — please rely on official filings and exchange data for investment decisions.

Contact

Feedback and suggestions are always welcome at gray.yoon92@gmail.com.