A margin call is your broker's demand that you add cash (or sell holdings) because a leveraged position has lost too much value. If you don't meet it fast enough, the broker liquidates your position automatically — often at the worst possible moment. To understand why, you first need to understand buying on margin.
What "buying on margin" means
Buying on margin means borrowing money from your broker to buy more of an asset than your cash alone allows. Your own money is the initial margin; the rest is a loan secured by the assets you bought. The ratio of total position size to your own money is your leverage. With 5× leverage, $1,000 of your money controls a $5,000 position.
Why leverage cuts both ways
Leverage multiplies both gains and losses by the same factor. At 10× leverage, a 1% move in the asset is a 10% move in your account. A 10% adverse move wipes you out entirely. This is the single most important — and most underestimated — fact about margin: it doesn't make you smarter, it just makes every outcome bigger and faster.
What actually triggers a margin call
Brokers require you to keep a minimum amount of your own equity in the account, called the maintenance margin (often around 25–30% for stocks, but far higher buffers are wise). When losses erode your equity below that line, you get a margin call:
- Deposit more funds to restore your equity, or
- Close positions to reduce the loan, or
- Do nothing — and the broker force-liquidates for you, usually selling into a falling market at a bad price.
A quick example
You put in $1,000 and borrow $4,000 for a $5,000 position (5× leverage). The asset drops 15%. The position is now worth $4,250, but you still owe $4,000 — your equity is just $250. You've lost 75% of your money on a 15% move, and you're likely already in margin-call territory. That asymmetry is exactly what the later levels of Pump or Dump are built to teach you, painfully and quickly.
How to avoid getting called
- Use less leverage than the broker allows — the maximum is rarely the smart amount.
- Keep a cash buffer well above the maintenance requirement.
- Cut losses early. At high leverage a small loss snowballs; taking it quickly is cheaper than hoping.
- Size positions so a normal bad day can't wipe you out.
The bottom line
A margin call is the market's way of collecting on a bet you couldn't fully afford. Leverage is a tool, not a strategy — and the higher it goes, the smaller the move that ends you.
Related
- ▶ Play Pump or Dump — feel a margin call for yourself.
- 📖 Full Pump or Dump guide
- 📚 More explainers in the Learn hub