Crypto goes down on a day stocks go up when the selling comes from inside crypto: a margin flush, an exchange or token headline, ETF outflows, or a weekend move equities have not priced yet.<\/p>\n
Bitcoin and the S&P 500 do tend to move together, but the link is far looser than the headlines suggest.<\/p>\n
The IMF measured this after the pandemic. From 2017 to 2019 the correlation of daily Bitcoin and S&P 500 returns was 0.01, effectively zero. For 2020 and 2021 it rose to 0.36, per the IMF’s analysis of crypto and equity correlation<\/a>.<\/p>\n A correlation of 0.36 leaves most daily variation unexplained. The two markets share one driver, risk appetite, but each has its own weather. Days where they split are the normal case.<\/p>\n Crypto never closes. The NYSE core session runs 9:30 a.m. to 4:00 p.m. ET on weekdays, per the exchange’s published trading hours<\/a>. A Saturday Bitcoin sell-off shows up Monday as crypto red, stocks green, same news.<\/p>\n Margin is the second reason. Perpetual futures let traders borrow against positions, so a modest dip can cascade into forced liquidations that push price well below where the selling started. Equities carry far less of this fuel.<\/p>\n Third, crypto has headlines stocks ignore: spot ETF flows, an exchange outage, a regulatory filing, a large token vesting release. The real reasons behind a crypto dip<\/a> are usually one of these rather than a macro shock.<\/p>\n Fourth, capital rotates. When equities rally on earnings, some traders sell the more volatile asset to fund the trade. That gives you risk-on in stocks and risk-off in crypto in the same afternoon.<\/p>\n On the morning this was written the premise did not hold. CoinGecko had Bitcoin<\/strong> at $79,356, up 1.6 percent in 24 hours, and Ethereum<\/strong> at $2,498, up 2.1 percent. Bitcoin was up 10.4 percent on the week.<\/p>\n It was still 37 percent below its October 2025 all-time high of $126,080. The S&P 500 closed at 7,675.70 on 26 August, flat against 7,677.28 the day before, and about 3.5 percent above its 27 July close.<\/p>\n The Crypto Fear and Greed Index read 71, Greed, and had stayed between 65 and 74 all week. “Crypto is down today” is often a memory of one red candle at breakfast rather than a reading of the whole market.<\/p>\n Open CoinGecko’s global page and read total market cap and Bitcoin dominance. Dominance rising while the total falls means money is hiding in Bitcoin, an altcoin or margin problem rather than a macro one. Then compare the S&P 500 close for the same session.<\/p>\n Next, check flow data for the big spot funds. Sustained outflows against rising stocks means sector rotation, a pattern covered in our guide to how Bitcoin ETFs move related stocks<\/a>.<\/p>\nFour reasons crypto can fall while equities rise<\/h2>\n
What the data showed on 27 August 2026<\/h2>\n
How to tell if the drop is crypto-specific in two minutes<\/h2>\n