Margin Debt
How much of the market is bought with borrowed money. FINRA publishes customers' margin debit balances monthly — the most direct public measure of speculative leverage, and the first money to leave when prices fall. Two facts carry the page: its peak led the S&P 500 top in all six cycles since 1997, and a fall of more than 12 % from that peak has accompanied every bear market in the data.
Latest month: — · History: — · FINRA publishes in the third week of the following month.
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Peak Warning
—Markov Outlook — where the cycle goes
Today's Leverage Read in Plain Words
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Margin Debt vs S&P 500 — 1997 to today
Monthly, month-end balances in billions of US dollars. In the top pane both level axes are logarithmic so equal percentage moves look equal across three decades. Red arrows mark the peak of each leverage cycle (a decline of at least 12 % follows); the yellow square marks February 2010, when FINRA Rule 4521 replaced the separate NYSE and FINRA collections — the debit balances are continuous across it (the earlier rows already add both), but the split of free credit into cash and margin accounts only exists from then on.
S&P 500 is the monthly average of daily closes (Shiller series, spliced forward from our own daily data). CPI-adjusted line in today's dollars.
Pane 2 divides the debt by a base that grows too. Pane 3 is the oscillator: each series as a percentage deviation from its own trailing 36-month average, so zero means “normal for this market”. The window is trailing, never fitted over the whole sample — every point uses only what was knowable at the time. Pane 4 nets the cash sitting in accounts against the debt. Use the Show menu to switch any series on or off.
Leverage Cycles Since 1997
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| Margin Debt Peak | Trough | Decline | Months | S&P 500 Peak | Margin Debt vs Market Top | S&P 500 Drawdown | Debt Back at Peak |
|---|---|---|---|---|---|---|---|
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S&P 500 peak = highest monthly average within 12 months before / 6 months after the margin-debt peak; drawdown = from that high to the lowest monthly average before margin debt regained its peak. Monthly averages damp fast moves (COVID: −34 % on daily closes reads −19 % here).
How to Read Margin Debt
What it measures
- Margin debt — what customers owe brokers for shares bought on margin, every FINRA firm, last business day of the month.
- Free credit — the opposite side: uninvested cash. Debt minus cash is net investor credit, i.e. whether the public is a net lender or a net borrower.
- The level always grows with the market and with inflation. Growth rate and distance from the peak are what carry information — not the level.
Why it leads
- Borrowed money is forced money. Falling prices turn margin calls into selling regardless of anyone's view, and that selling triggers more calls.
- So leverage is withdrawn before the index tops: the peaks below came 2–6 months ahead of the S&P 500 highs of 2000, 2007, 2018 and 2021.
- Above roughly +20 % year over year marks the late, euphoric stage; a swing to a year-over-year decline has marked its end. A monthly regime read, not a timing tool.
Which denominator — and why only one of them oscillates
Over 1997–2026, margin debt as a share of household equity holdings stays in a 1.4–2.7 % band and mean-reverts, while the same debt over GDP (1.2 → 4.6 %) or disposable income (1.7 → 6.3 %) climbs for three decades. Equity holdings are the collateral the debt is actually borrowed against, so dividing by them separates leverage behaviour from collateral value. For the other two, “highest ever” is the normal state and not a warning.
The two oscillators are complementary, not redundant — deviation from the 36-month average at each leverage peak:
| Oscillator | 2000 | 2007 | 2018 | 2021 | what it sees |
|---|---|---|---|---|---|
| Margin Debt vs 36M avg | +80 % | +59 % | +20 % | +41 % | raw borrowing surge |
| Leverage intensity (÷ S&P 500) | +45 % | +35 % | +1 % | +6 % | debt outrunning collateral |
| Debt ÷ free credit | +10 % | +10 % | +26 % | +27 % | shrinking cash buffer |
2000 and 2007 were leverage growing faster than prices — the collateral lens lights up, the cash lens barely moves. 2018 and 2021 were the opposite: borrowing kept pace with a rising market, but the cash buffer thinned out. Either lens alone misses half the episodes, which is why both are on the chart.
Source and caveats
FINRA Margin Statistics, monthly since January 1997, updated on the FINRA site in the third week of the following month and rebuilt here nightly. Rows before February 2010 are the sum of the former NYSE and FINRA collections; from February 2010 one collection under FINRA Rule 4521 covers all member firms and reports cash-account and margin-account free credit separately (before that only the combined figure exists, which is why the free-credit split starts in 2010 while net investor credit runs back to 1997). Margin debt at FINRA firms is not all leverage in the system — futures, options, securities-based loans and fund leverage are outside it — but it is the part that is measured every month, and its turns have been reliable.
Denominators come from FRED: household equity holdings from the Fed's Z.1 financial accounts (quarterly, published about ten weeks after quarter end — so that ratio legitimately ends a couple of months before the others, and is never extrapolated forward: carrying a stale collateral value through a rising market would overstate the current ratio by roughly a sixth, in the direction that makes leverage look worse). Nominal GDP and disposable personal income are slow enough to carry forward at most three months, worth under 0.05 percentage points.
