On July 3, 2026, MarketWatch reported that Michael Burry had disclosed a short position in Micron at $1,051.87 a share. Business Insider also reported bearish positions tied to Nvidia, Tesla, Caterpillar, Applied Materials, and the iShares Semiconductor ETF SOXX.
That caught attention because many AI-linked stocks had already risen sharply. The useful question is not whether Burry will be right. It is how a falling stock price can become a profit for a short seller, and why the same trade can become dangerous if the stock moves the other way.
Short selling profits from a falling stock
In a short sale, an investor borrows shares, sells them first, and hopes to buy them back later at a lower price.
If a stock is shorted at $100 and later bought back at $90, the simple difference is a $10 profit before borrowing costs, fees, taxes, and margin costs.
| Later stock price | Stock move | Short seller result |
|---|---|---|
| $90 | -10% | +$10 |
| $80 | -20% | +$20 |
| $110 | +10% | -$10 |
| $150 | +50% | -$50 |
A long investor makes money when the stock rises. A short seller makes money when the stock falls. The same stock move sends money in opposite directions.
The Micron math
Using the reported Micron short price of $1,051.87, a move down to $975.56 creates a simple difference of $76.31 per share.
```text 1,051.87 - 975.56 = 76.31 76.31 / 1,051.87 = about 7.3% ```
Before fees and position details, that is about 7.3% of the short sale price. The actual return depends on size, timing, borrow cost, fees, and whether the position is stock, options, or a mix. The point here is the mechanism.
Why AI stocks?
The common thread is valuation. These are stocks where AI expectations have become part of the price.
Micron is tied to AI memory demand. Nvidia is tied to GPUs. Applied Materials is tied to chipmaking equipment. SOXX gives exposure to a basket of semiconductor stocks. Tesla carries expectations around autonomy and robotics. Caterpillar has been pulled into the AI trade because data centers need power equipment.
Caterpillar is the unusual example. Many people still think of it as a construction and heavy-equipment company. Barron's reported that Caterpillar's Power and Energy segment sales rose 22% year over year in the first quarter, while the stock rose 86% in the first half of 2026.
Stocks do not need bad news to fall. If a lot of future profit is already priced in, a small change in confidence can hit the stock hard.
The risk runs the other way
Short selling can produce fast gains when the stock falls. It can also produce fast losses when the stock rises.
For a normal long position, the stock cannot fall below zero, so the maximum loss is the principal invested. A short position is different. If the stock keeps rising, the money needed to buy back the shares can keep rising too.
Bearish put positions work differently. Their maximum loss can be limited to the option premium, but expiration, time value, and volatility become part of the money calculation. The reported Burry positions were not all the same structure: Micron was described with a short-sale price, while several other names were reported as put-option or bearish positions.
So a short-selling headline raises two separate questions.
| Question | What it tells you |
|---|---|
| How far did the stock fall? | Potential short-side gain |
| How far can the stock rise? | Loss risk |
The ReturnLab view
Michael Burry's name makes the headline louder because of his role in the 2008 housing trade and his continued criticism of AI stock valuations.
But the useful lesson is not to copy a famous investor. It is to understand how the same stock move can create profit for one side and loss for the other.
This is not a recommendation to buy or sell any AI stock. It is an explanation of how short selling and bearish positions change the flow of money.