Micron Technology posted one of the most jaw-dropping quarters in semiconductor history on June 24. By June 25, its stock was down 5%.

The memory chipmaker reported fiscal Q3 2026 revenue of roughly $41 billion, a year-over-year surge of more than 300% from approximately $9.3 billion. Shares initially jumped around 15% in after-hours trading. Then broader Wall Street futures declined, chip stocks slid in sympathy, and profit-taking did what profit-taking does.

Record numbers, record whiplash

Revenue quadrupled. Non-GAAP gross margins expanded to roughly 85%, up from about 39% in the year-ago quarter. The company also highlighted $22 billion in customer deals for memory chips. Competitors Sandisk and Western Digital, which had initially rallied on Micron’s strong results, also turned lower as the sector-wide downturn took hold.

The pullback didn’t happen in a vacuum. Micron had already experienced a roughly 7.5% drop during a mid-June tech selloff prior to earnings. So while the post-earnings pop was dramatic, the stock was effectively recovering lost ground before promptly losing some of it again.

The AI memory boom in context

The more than 300% revenue growth also reflects where the memory market was a year ago. Fiscal Q3 2025 revenue of $9.3 billion came during a period when memory pricing was still recovering from a brutal downcycle.

The margin expansion from 39% to 85% suggests Micron isn’t just shipping more chips — it’s shipping higher-value chips at prices that reflect genuine scarcity in cutting-edge memory products.

What this means for investors

The one-day selloff is a useful reminder that even transformative earnings don’t insulate stocks from macro gravity. Investors who bought the after-hours pop at a 15% premium were underwater within 12 hours.

Micron’s mid-June drop of 7.5% before earnings showed how quickly sentiment can shift. The stock recovered that and more on earnings night, only to give a chunk back the following day.