What a small share moves in the whole
A share changes by itself when prices move. A worked example, not a recommendation: a portfolio is 5 % bitcoin and 95 % other holdings that stay the same.
If bitcoin falls to 0.264 times its value, as from the end of 2017 to the end of 2018, the 5 % are worth only 1.32 %. The portfolio loses 3.68 % and the share drops to 1.32 divided by 96.32, or 1.37 %. If bitcoin triples, the share grows to 15 divided by 110, or 13.6 %, and the portfolio by 10 %.
A small share moves the whole portfolio little, but shifts a lot itself when the price falls or rises.
With 5 % bitcoin in a portfolio and a fall like 2017 to 2018, the portfolio loses 3.68 % and the share drops to 1.37 %.
Worked example, the rest of the portfolio stays the same. Not a recommendation.
Questions people ask
How much does a small bitcoin share move the whole portfolio?
With 5 % bitcoin and a fall like that from the end of 2017 to the end of 2018, the portfolio loses 3.68 % if the rest stays the same. If bitcoin triples, it grows by 10 %.
Why does a share change without anyone doing anything?
Because the parts of a portfolio move differently. If one part rises more than the rest, its share grows, and if it falls, its share shrinks.
How large is bitcoin compared with the world's shares?
At the verified price of 30.09.2026 about 1.68 trillion US dollars. The world's listed shares were worth about 84 times as much at the end of 2025.
Source: Bitcoin-Jahresschlüsse, je Jahr mindestens zwei öffentliche Belege, as of 2025, retrieved 2026-10-22 · Alpha Modus Holdings, Inc. (Form 8-K, 01.10.2026), as of 2026-09-30, retrieved 2026-10-28 · Bitcoin Core, src/validation.cpp (GetBlockSubsidy) und src/kernel/chainparams.cpp, MIT-Lizenz, as of 2026-10-29, retrieved 2026-10-29 · Weltbank WDI CM.MKT.LCAP.CD (World Federation of Exchanges), CC BY 4.0, as of 2025, retrieved 2026-10-19
A portfolio with a share of bitcoin before and after a price move, and its size beside the world's shares.
The simulation, the comparison and the Beam stay free.
Education, not advice. Disclaimer