Why "How Much Per Coin" Isn't the Whole Story

Most beginners first learn position sizing as a single-asset question: "How much SOL should I buy this week?" That's a good starting point, but long-term investors usually end up holding more than one asset. Once you own five, eight, or twelve different tokens, a new question appears that single-asset sizing doesn't answer: how much of your total portfolio should any one of those positions represent?

This is a portfolio-level version of position sizing, and it matters just as much as sizing individual buys. You can follow a disciplined 1% rule on every single trade and still end up dangerously concentrated if you keep picking the same few assets, or dangerously diluted if you spread your capital across so many tiny positions that none of them matter.

The Two Failure Modes

There are two opposite mistakes that both come from ignoring portfolio-level sizing.

The first is over-concentration. Imagine you've made ten separate buys over six months, but eight of them went into the same two tokens because you kept feeling confident about them. Even if each individual buy followed a sensible rule, your portfolio is now effectively a two-asset bet. If either of those tokens has a sharp downturn, your whole account feels it.

The second mistake is over-dilution. This happens when someone tries to "diversify" by holding twenty or thirty small positions, each just 2-3% of the portfolio. On paper this looks safer, but in practice it becomes hard to track, and the gains from your best-performing assets get diluted by holding too many mediocre ones. Diversification only helps up to a point — beyond that, it mostly adds complexity without reducing risk much further.

Thinking in Buckets, Not Just Buys

A useful way to manage this is to think of your long-term portfolio in buckets rather than individual trades. Before adding a new asset, ask: what percentage of my total portfolio do I want this category to represent over time? For example, you might decide that no single asset should exceed 15% of your total paper portfolio, and that a handful of core positions should make up the majority of your capital, with smaller amounts reserved for assets you're still getting to know.

This bucket thinking doesn't replace the 1% rule for individual entries — it sits on top of it. The 1% rule controls how much you risk on any single buy decision. The bucket limit controls how large that asset is allowed to grow relative to everything else you hold, even after several buys and some price appreciation.

How Drawdown Connects the Two Levels

Drawdown — the drop from a portfolio's recent high point to its lowest point afterward — is usually measured at the account level, not the single-trade level. This is exactly where portfolio-level position sizing shows its value.

Picture two investors who both started with the same amount of simulated USDC. Investor A concentrated 60% of their capital into one asset because it had performed well recently. Investor B kept every asset under a 15% cap, even the ones that had grown faster than expected. When that popular asset eventually corrects sharply, Investor A's overall portfolio drawdown will be much steeper than Investor B's, even though both investors "did their position sizing" on individual trades correctly. The difference came entirely from how concentration was allowed to build up over time, not from any single buying decision.

This is why checking your portfolio's allocation periodically matters just as much as sizing each new trade. An asset that started as a small, reasonable position can quietly grow into an oversized one purely because it performed well — and that growth is exactly what increases your drawdown exposure later.

Key takeaways

  • Position sizing isn't just about one trade — it also applies to how large each asset is allowed to become relative to your whole portfolio.
  • Over-concentration (too much in one or two assets) and over-dilution (too many tiny positions) are opposite mistakes that both ignore portfolio-level sizing.
  • Setting a maximum percentage any single asset can represent helps control concentration even as individual positions grow from good performance.
  • Portfolio-level drawdown is driven more by concentration than by any single entry decision, so periodic rebalancing checks matter.
  • The 1% rule for individual buys and a portfolio concentration cap work together, not as substitutes for each other.

Apply it on MAPLUStrade

Use paper trading to build out a long-term plan with simulated USDC. Size each entry using the 1% rule from the Position Sizing course, then check the portfolio page regularly to see how your allocations are shifting as prices move. Let the platform's drawdown tracking show you, in real numbers, how concentration in any one asset affects your overall portfolio swings — without risking real funds while you learn the pattern.

This article is educational only and not financial advice; all investing carries the risk of loss, including in simulated and real markets.