5 / 6 · 5 min
Five altcoin longs are one trade, not five
You carefully risk 1% in each position. You open five and believe you are risking 5%. In reality, if they move together, you are risking nearly 5% in ONE trade.
Risk management computed one position at a time falls apart precisely when there are several positions. The rule "1% per trade" assumes trades are independent: one loses, another may win. If all five react to the same thing, there is no independence, and five 1% positions behave as one 5% position.
Correlation in plain words
Correlation shows how much two instruments move together. One means they move in lockstep. Zero means no relation. Minus one means mirror opposites. For most altcoins, correlation with bitcoin sits between 0.6 and 0.9: when BTC drops three percent they drop four to six, nearly all of them and nearly simultaneously.
How "diversification" becomes concentration
A $10,000 deposit. You open longs on SOL, AVAX, LINK, DOT and NEAR, each risking 1% — $500 in total. Risk looks spread out. A rate headline lands, BTC falls 4%, all five coins fly down with it and take out the stops. A $500 loss in fifteen minutes — 5% of the deposit in a single event. Five positions were one bet: "crypto goes up".
Treating different tickers as different risks
Diversification works when assets react to DIFFERENT causes. Five altcoins react to one: crypto market sentiment. Adding a sixth altcoin is not diversification, it is enlarging the same bet. Real diversification looks different in our table: crypto, gold, oil and a currency pair move on different things, and their mutual correlation really is near zero.
Crude but useful. Five 1% positions at 0.8 correlation give about 4% of combined risk — almost like one 4% trade, not five one-percent ones. At 0.2 correlation the same five give about 1%, and that is genuine diversification.
What to do
- Compute total portfolio risk, not each position separately. Set a limit: no more than 3% combined, for instance.
- Reduce per-position risk when several related ones are open: five correlated longs at 0.4% each, not 1%.
- Check correlation before adding a new position, not after.
- Count an altcoin long and a bitcoin long as one bet, because that is what they are.
- Remember that correlations RISE in a panic: what usually walks alone falls with everyone else in a crash.
Correlation is not constant
Its nastiest property: it increases exactly when you need that least. In a calm market a coin may walk its own path at 0.3 correlation — and you honestly count it as independent. On a crash day all correlations head toward one: everything gets sold indiscriminately. A portfolio that looked spread out turns out to be a single position on precisely the day when that is expensive.
Every row of our screener carries correlation with bitcoin over the last 24 hours. Before opening a second position, look at that column for both coins: if both read 0.8, you are doubling one bet rather than opening two different ones.
About correlation with bitcoinRecompute your portfolio
Write out every position open right now and the risk in each. Look up each coin's correlation with bitcoin in the screener. Add risks separately by group: everything above 0.6 counts as one bet. The resulting number is your real risk — and it almost always turns out two or three times larger than what people quote from memory.
You hold three longs correlated 0.85 with each other, 1.5% risk each. What is the real risk?
About 1.5 × 3 × 0.85 ≈ 3.8%, almost like a single 4% trade. If your limit is 3% per event you have already breached it, even though each individual position looks modest. The correct size here is roughly 1.2% per position so the combined risk fits inside 3%.
Why do "independent" positions fall together in a crash?
Because in a panic people are not selling a particular asset, they are selling risk itself: closing everything to raise cash. At that moment the reasons coins usually diverge stop operating and correlations jump toward one. Plan by the correlation of a bad day, not a calm one.