For many expats, a stock price is just a number. But to an investor, a stock price is only half of the equation. To know if you are overpaying, you must look at Multiples.
1. The Forward P/E (Price to Earning ratio): Seeing the Future
Most beginners look at the "Trailing P/E" (past 12 months). But the market cares about the next 12 months.
Take Micron Technology (MU) as an example.
Trailing P/E: Recently, it traded around 27x. To a value investor, this might look "fair" or even slightly high for a semiconductor company.
Forward P/E: However, because of the AI boom, analysts expect earnings to explode. Its Forward P/E is roughly 10x.
The Lesson: If you only looked at the current price, you will see a 27x multiple. But if you look at the forward earnings, you realize you are actually buying the future company at a "discount" price of only 10 times its future profits.
2. The Price-to-Sales (P/S) Ratio: The "Early Stage" Metric
What if a company isn't making a profit yet? You can't use P/E because there are no "Earnings." This is where we use the P/S Ratio (Market Cap / Total Revenue).
This is the ultimate tool for high-growth tech companies. It tells you how much you are paying for every $1 of sales the company makes.
Growth can make a high P/S ratio look terrifying; or incredible. Look at Nebius Group (NBIS), an AI infrastructure play:
Current P/S: It has traded at a trailing P/S as high as 50+. For most investors, a P/S of 50 is "insanely expensive"
Forward P/S (2027): Because Nebius is expected to grow its revenue by thousands of percentage points as it builds out AI data centers, its Forward P/S for 2027 drops to around 3x.
The Lesson: A stock can have a "high" price today because the market is betting on Sales Growth. If the sales grow fast enough, the valuation "catches up" to the price.
3. Sales vs. Earnings Growth
To master the valuation matrix, you must track two different types of growth:
Sales (Revenue) Growth: This is the "Top Line." It proves people want the product. For young companies like Nebius, this is the most important metric.
Earnings Growth: This is the "Bottom Line." It proves the company can actually make money from those sales. For mature companies like Micron, this is what ultimately drives the stock price higher.
Summary
Micron shows us that a "fair" price today is a "cheap" price tomorrow if earnings grow.
Nebius shows us that a "high" P/S today is justified if the sales growth is massive.
Always compare Forward multiples to Trailing multiples to see if the "growth story" is real.
Stop looking at what a company did last year. Start calculating what it will do next year.
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