Established ‘Sell in May’ philosophy looks broken, and that could be good news for Bitcoin

A notable development has hit the crypto markets. “Sell in May and go away” is the idea that stocks reliably underperform between May and October, and it describes a market that might no longer exist. Bloomberg Intelligence data shows the S&P 500 ETF has closed the May-October period in positive territory in 25 of the last 33 years, with only one negative summer stretch in the past decade. Bespoke data cited by Bloomberg shows the cumulative return from holding SPY is only in May-October since the ETF's 1993 debut, at roughly 171%.

That is real money, just considerably less than the 731% earned by staying long only in November-April. Despite the seasonal performance difference, the cliché that May automatically means sell does not hold. A Bloomberg Intelligence chart shows SPY closed the May–October period positive in 25 of the last 33 years, returning 171% versus 731% in November–April.

Market Dynamics

The rule that might have stopped working The logic behind the old saying is that corporate earnings slow, trading desks thin out, and investors rotate into cash or bonds until autumn. That playbook worked well enough for decades, built for a market where institutional money moved slowly, and risk appetite followed a predictable rhythm. Bitcoin has spent two years building direct plumbing into traditional portfolio flows.

Data from Farside Investors shows that US spot Bitcoin ETFs pulled in roughly $1. 5 billion between Apr. 17 and 24, and cumulative net inflows have reached approximately $58.

That market structure has folded Bitcoin into the same risk appetite machinery that drives equities, giving BTC direct exposure to whatever keeps institutional investors willing to hold. When institutional money does not reflexively de-risk into summer, BTC avoids one of the psychological headwinds that have historically hit speculative assets in May. The Federal Reserve's own research has flagged that crypto ETP bid-ask spreads are broadly comparable to those of similarly sized equity ETFs and ETPs, and has argued that NAV premiums in crypto funds warrant monitoring as a measure of how interconnected crypto and equity markets have become.

Market Impact

Related Reading This week Bitcoin will face major volatility across a key 48 hour period: Fed first, GDP and PCE right after Bitcoin faces a 48-hour macro trap as the Fed speaks first, but GDP and PCE get the last word. Apr 27, 2026 Andjela Radmilac Bitcoin's May setup The case for Bitcoin entering summer with fewer headwinds depends almost entirely on what the next six weeks of data deliver . 28-29 meeting produced a policy decision and a press conference by Fed Chair Jerome Powell on Apr.

The Bureau of Economic Analysis releases first-quarter GDP and March PCE on Apr. April payrolls land May 8, April CPI arrives May 12, and the FOMC minutes from the April meeting come May 20, and the next full Fed meeting runs June 16-17. Date Event Latest reading / setup in the article Why markets care BTC read-through Apr.

28–29 Fed meeting + Powell press conference Fed stays on pause unless data force a shift Sets the tone for rates, liquidity, and how hard the Fed pushes back on cut expectations A patient, data-dependent Fed supports risk appetite and helps BTC avoid a seasonal de-risking narrative Apr. 30 Q1 GDP + March PCE GDPNow estimated Q1 growth at 1. 21; February PCE was 2.

Crypto markets are watching this development closely as investors weigh its potential impact on prices.