Core-satellite crypto portfolio: how much in large caps vs altcoins?

With $10,000 of crypto money in total (how to set that total is in How much should I invest in bitcoin?), a cautious split puts $8,500 into bitcoin and ethereum and leaves $1,500 for altcoins. If you want more upside, make it $7,000 and $3,000. The first part is called the core and the second the satellite.

Every ratio below is a ratio inside your crypto money. What share crypto takes of your total assets is a separate question.

Why keep large caps and altcoins in separate buckets

One pot of money can't easily meet two needs at once: holding steady enough that you can sleep, and taking a shot at high upside. The assets that serve those two needs are very different. Manage them as one pot and you can't tell which part to sell when prices rise, or which part to give up on when they fall.

Once they are separate, each part runs on its own rule: the core is the part you have to be able to hold, and the satellite is the part you accept losing. Core-satellite is a long-standing split in traditional investing. Applied to crypto, the satellite has to be sized on the assumption that it can go to zero.

What goes in the core: bitcoin and ethereum

The core is the larger part, and it holds bitcoin and ethereum. There are two reasons for choosing them:

• Liquidity. You can buy or sell at any time and the bid-ask spread is small. A small-cap coin can be easy to buy and then have a very thin order book when you want to sell. For money you plan to hold for years, being able to sell when you need to matters a great deal.
• They have been through full boom-and-bust cycles. That guarantees nothing about the future. All it shows is that after a major crash these two were still being traded and could still be sold.

Large caps still fall hard: bitcoin's monthly close went from 114,048.93 USDT in September 2025 to 58,624.71 USDT in June 2026, a fall of 48.6% in nine months (source: Binance public market data API, BTCUSDT monthly candles, UTC). The core is there so you can hold on; it doesn't promise you won't lose money.

Once bought, the core is best left alone, and it suits slow buying through DCA. For weekly versus monthly buys, see how to choose a DCA frequency.

How much in altcoins at most: a total cap and a per-coin cap

The satellite is the smaller part. It holds coins that swing harder, might rise more and might go to zero. One question sets its cap:

If every altcoin I hold went to zero tomorrow, would it do me real damage?

If the answer is yes, you hold too much. In numbers: if crypto is 10% of your investable money and the satellite is 15% of that, altcoins come to 1.5% of your investable money in total, and losing all of them shrinks the whole pot by 1.5 percentage points. With a 30% satellite it is 3 percentage points.

Each single altcoin has to be smaller still. Assume any one of them can go to zero, and size each so that its loss doesn't change your life or your plans. Spread that 1.5% over three coins and each is about 0.5%. The test: picture the coin going to zero tomorrow and ask whether you would have to rearrange anything. If you would, cut it.

Two rules go with this:

• Keep DCA money and altcoin money apart. DCA money buys large caps only. If you want a shot at altcoins, use a separate, small, one-off sum: no recurring buys, no averaging down, and nothing taken from the DCA side. If it is lost, the long-term plan is untouched.
• The satellite needs reasons too. Being able to afford the loss doesn't mean buying anything that comes along. For each coin you should be able to say what it is, why you are buying it and what would make you admit you were wrong. The selling rules are in When to take profit and when to cut losses.

Two template splits: 85/15 and 70/30

Template	Core (bitcoin, ethereum)	Satellite (all altcoins combined)	Who it suits
Conservative	About 85%	About 15%	First-time buyers, anyone unsure how they will handle the swings, and anyone who simply prefers stability.
Balanced	About 70%	About 30%	People who have been through at least one real downturn, know they can hold through it and are willing to take more risk for more upside.

Beginners should start with the conservative split. After you have held through one real drawdown and know you can do it, consider moving toward the balanced one. Don't take the satellite above 30%: at that size, losing every altcoin is no longer a minor hit.

Holding only altcoins, with no core at all, is the far end of that, and for a beginner it isn't a good idea, for three reasons:

• Altcoins can go to zero. Holding nothing else means holding all your crypto money on those terms.
• Your tolerance hasn't been tested. Until you have been through a major drop, your estimate of how much you can take isn't reliable. Turning risk up to the maximum at that stage gets the order backward.
• Without a core underneath, holding on is harder. When the whole pot is in high-volatility coins, every drop makes you want to act, and it is easy to sell at a low.

The order is: build the core first, then add a small satellite.

How often to rebalance when the split drifts: by calendar or by threshold

Once you have set 85/15, the ratio moves on its own. If the core stays flat and the satellite rises to about 2.43 times its value, its share goes from 15% to 30%: 15 × 2.43 ÷ (85 + 15 × 2.43) ≈ 30%. Without adding a cent, you have gone from the conservative split to the balanced one. It works the other way too: if the satellite loses about 37%, its share shrinks to 10%.

Bringing the ratio back to target is called rebalancing. There are two ways to do it; pick one:

• By calendar. Check once every six or twelve months. On that date, open the account and work out the current ratio. If it has drifted, bring it back; if it has barely moved, leave it. Ignore it the rest of the time.
• By threshold. Set a line in advance, for example: act only when the satellite's share is more than 5 percentage points off target. With a 15% target, that means acting above 20% or below 10% and ignoring everything in between. By the formula above, with the core flat, a rise of about 42% in the satellite takes it to the 20% line.

When the satellite goes over the line, sell the excess and move it into the core or hold it as cash; how to sell is in what to do when your share goes over the cap. When the satellite falls below the line, leave it: adding money to falling altcoins conflicts with the no-averaging-down rule above, and a smaller share only makes the pot more conservative.

Don't rebalance too often. Every trade costs a fee. Whether a sale has tax consequences depends on the rules where you live. And the more often you act, the easier it is for rule-following to turn into chasing rallies and selling dips. The difference between the two:

	Rebalancing	Chasing rallies, selling dips
Based on	The current ratio has moved away from a target set in advance	An emotional reaction to short-term price moves
Direction	Trim what has risen too far	Buy after a rise, sell after a fall
How often	Once every six to twelve months, or when the threshold is hit	Whenever a headline or a group-chat message makes you want to act
Purpose	Keep risk inside the range set beforehand	Catch every move

If you can't tell which one you are doing, ask yourself: is this action required by a rule I set months ago, or is it something I only want to do after looking at today's prices?