KOSPI vs S&P 500
the KOSPI ETF · US stocks (S&P 500) — 0.57, ranging +0.14 to +0.86 year by year
1-year rolling correlation · green together, red apartas of 2026-09-11
- +0.57normally
- +0.67in crashes
- +0.14 ~ +0.861-year range
- 1.26positions if held 50/50
Nothing surprising, and that is the answer
They correlate 0.57, and +0.67 in crashes — not much of a change.
The one-year correlation does range +0.14 to +0.86, so the curve tells you more than the average.
Try it on your own portfolio
Opens with these two already entered. Add what you hold and the vs the rest and New columns answer whether to add one more.
Open with the KOSPI ETF · US stocks (S&P 500)Weekly returns, 609 weeks since 2015, every price converted to USD. “Crashes” means the 5% of weeks the KOSPI ETF fell hardest. One sample, one window — not a promise about the future.