U.S. stocks have climbed for most of the past four years, with the Dow Jones, S&P 500 and Nasdaq Composite repeatedly hitting record closes, driven by AI infrastructure spending, record IPOs and better-than-expected earnings. The article highlights outstanding margin debt, the money investors borrow from brokers to buy or short-sell securities, as a telling gauge of risk appetite, reported monthly by FINRA. Since 1997, margin debt has risen by at least 65% over a short period four times, and the previous three spikes preceded major bear markets, with the S&P 500 down 49% by October 2002 and 57% by March 2009. The latest spike, from April 2025 to June 2026, lifted margin debt 77% to a record $1.502 trillion, which the article says is a warning sign for stocks in the short term. Still, it notes that over the long run, stocks have historically delivered considerably higher average annual returns than bonds, commodities and real estate.
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Related tickers and likely impact
QQQ
▼ Likely negativeInvesco QQQ Trust
Relevance: medium
| Market | US stocks |
|---|---|
| Sector | ETF |
| Close on 10/16/2026 | 709.82 |
| Change that session | -2.50% |
SPY
▼ Likely negativeSPDR S&P 500 ETF
Relevance: medium
| Market | US stocks |
|---|---|
| Sector | ETF |
| Close on 10/16/2026 | 763.31 |
| Change that session | -1.10% |
Impact is scored by AI from the headline and may be wrong. It is not investment advice.
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The Dow Jones Industrial Average, S&P 500 and Nasdaq Composite have hit several record closing highs over the past four years, driven by AI infrastructure spending, record-breaking IPOs and better-than-expected earnings. The article highlights outstanding margin debt, reported monthly by FINRA, as a measure of investor risk-taking, since borrowing can magnify both gains and losses. Since 1997, margin debt has surged at least 65% over a short period four times, and the three earlier episodes preceded major bear markets, including the dot-com crash, the financial crisis and the 2022 downturn. From April 2025 to June 2026, margin debt rose 77% to an all-time high of $1.502 trillion, which the article says could foreshadow trouble for stocks, though long-term investors have historically benefited.
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