Last week’s announcement by President Donald Trump of increased tariffs continues to send shockwaves through global trade and financial markets, triggering dramatic fluctuations across major stock indices.
While recent market volatility has rattled investors, history reminds us that the U.S. stock market has weathered even more turbulent storms. Despite last week’s steep declines—among the most severe in the past decade—the single worst day in U.S. market history still dates back to the late 1980s.
Let’s take a closer look at some of the most significant one-day drops in the stock market’s history:
Biggest One-Day Percentage Drops
- Dow Jones Industrial Average:
📉 October 19, 1987 — Dropped 22.61% - S&P 500:
📉 October 19, 1987 — Dropped 20.47% - Nasdaq:
📉 March 3, 2020 — Dropped 12.32%
Understanding Points vs. Percentage Drops
When evaluating market performance, it’s important to distinguish between point drops and percentage changes. While point drops offer a snapshot of day-to-day market movement, percentage changes more accurately reflect the scale of a decline relative to the market’s overall value.
Key Market Crashes Through the Years
🟥 Black Monday – October 19, 1987
What Happened:
Known as Black Monday, this remains the most devastating one-day drop in stock market history. A combination of overvaluation, program trading, and investor panic contributed to a sudden collapse.
By the Numbers:
- Dow Jones: −22.6% (−508 points)
- S&P 500: −20.4% (−58 points)
- Nasdaq: −11.3% (−46 points)
🟧 March 16, 2020 – Pandemic Panic
What Happened:
As the COVID-19 crisis escalated globally, markets plunged amid fears of a looming recession. Just days prior, the Trump Administration had declared a national emergency, imposed travel restrictions, and state-level lockdowns began.
By the Numbers:
- Dow Jones: −12.9% (−2,997 points)
- S&P 500: −12% (−325 points)
- Nasdaq: −12.3% (−970 points)
🟨 Black Tuesday – October 29, 1929
What Happened:
The infamous crash of 1929 marked the beginning of the Great Depression. Following a period of speculative excess, markets collapsed under massive selloffs. Though the Nasdaq didn’t yet exist, the Dow and S&P took a severe hit over several days.
By the Numbers (Oct. 28, 1929):
- Dow Jones: −12.8% (−38 points)
- S&P 500: −12.3% (−3 points)
As history shows, the stock market has experienced dramatic downturns—each driven by unique economic, political, and social factors. While alarming in the moment, these episodes also underscore the resilience and cyclical nature of financial markets over time.
