Why does "the memecoin sector rose 9%" often mean just two or three coins went up?

"The memecoin sector rose 9%" usually means that the market-cap-weighted total of all memecoins went up, and that total is driven by a handful of the largest coins. In late September 2026 the sector beat the market — +9.01% versus +2.90% — but by CryptoTicker's count two coins produced three quarters of the move. For most small tokens, the "sector rally" may have barely registered.

How is sector growth calculated?#

Most aggregators compute a sector as the sum of its coins' market caps. The change in that sum is the "sector's growth". Under this method a coin's weight is proportional to its market cap: if one coin makes up 40% of the sector and rises 20%, it alone adds 8 percentage points to the result. A thousand small tokens that double may not move the total by even one percent if their combined weight is small.

This approach honestly shows how much money was added to the sector, but it says little about how many coins rose. Other measures are needed for that: the median change or the share of coins that gained over the period.

How concentrated is the memecoin market?#

According to CoinGecko, on September 26, 2026 the memecoin category's market cap was $36.6 billion. The largest positions:

• Dogecoin — $15.26 billion, about 42% of the category;
• Shiba Inu — $3.49 billion, about 10%;
• MemeCore — $2.83 billion;
• Pump.fun — $2.13 billion;
• Pepe — $1.88 billion.

Together the five coins account for about $25.6 billion, roughly 70% of the category. A 10% move in Dogecoin by itself shifts the sector figure by about 4%.

What happened to memecoins in late September?#

According to CryptoTicker data for September 24, the memecoin sector gained 9.01% while the overall market rose 2.90%, and about three quarters of the move came from two coins. One of the leaders was PEPE: on September 22 it rose 26.66% in a day to a market cap of about $2.147 billion on $1.537 billion of trading volume — almost 59% of its market cap in a single day (Interactive Crypto).

The backdrop was a broad rally: Bitcoin broke through $84–85K and the market saw a wave of short liquidations. By September 26, PEPE's market cap on CoinGecko had fallen to about $1.88 billion — 12% below its September 22 peak. What looked like a "sector turnaround" was partly a short burst in a single coin.

How can you check how broad a rally was?#

Before drawing conclusions from a sector headline, answer a few questions:

1. What share of the move came from the largest coins? If two or three coins explain most of the gain, it is not a broad rally.
2. What share of the sector's coins actually rose? You can count it from the category list on an aggregator.
3. How large is trading volume relative to market cap? Daily volume of 50–60% of market cap usually signals heavy speculation rather than steady accumulation.
4. What was left a few days later? Comparing the peak with the price 3–5 days on shows whether the gain held.

We have already written about why memecoins rise and fall harder than Bitcoin: concentration within the sector amplifies that effect.

What are the limitations of this analysis?#

• Aggregators define the "memecoin" category differently. CoinGecko, for example, includes platform tokens such as Pump.fun, which other sources may leave out.
• Market cap data for small tokens are less reliable: low liquidity and inaccurate supply figures distort the estimate.
• A market cap snapshot on one date ages quickly: memecoin shares shift within days.
• The "three quarters of the move" figure is CryptoTicker's; the source does not fully disclose the method.
• This article is not a recommendation to buy or sell any tokens.