Why the most common measure for valuation is inadequate in an age of AI
Software and services companies like Google, Microsoft, Amazon, Meta are spending on Capital Expenditures at the rate of heavy industry manufacturing. This defies their description as “asset light” business models which depend on services, distribution or platform economics.
The problem isn’t just semantic. It is that for their entire existence, these companies were valued for their profitability and measured in terms of a P/E ratio and earnings growth. The situation has changed dramatically. Their revenues are up, the earnings are up and growth is up and share prices are way up. But not their P/E ratios. Why is this?
Consider the graph below showing the (forward) P/E ratios of the Dot Com market leaders vs. the market leaders today.
This even as share prices and value concentration have risen even faster than in the Dot Com era. Seen from the P/E basis, it does not look like we are in a bubble. Earning growth is way up so the share prices are not outrageous on that basis. That is contrary to 1999 when P/E ratios in the hundreds were considered normal. Expectations of an internet fueled boom were speculative. Expectation of an AI earnings boom seem well founded.
But these companies could still be over-valued. The P/E ratio is not the full picture. It is in fact a simplifying shortcut which ignores significant pockets and omissions of value.
For this analysis I’ll use a sample including some of the largest market caps in the world with two exceptions. The exceptions are Lilly (LLY), Berkshire Hathaway (BRK-B) which are on the list but not in the top 10 (though in top 15) and Saudi Aramco and Broadcom which are in the top 10 but not on the list1.
| Company | Market Cap |
| NVDA | $5,709,746,405,376 |
| AAPL | $4,379,916,369,920 |
| GOOG | $4,811,891,146,752 |
| MSFT | $3,041,424,048,128 |
| AMZN | $2,874,514,866,176 |
| TSM | $2,166,463,135,744 |
| TSLA | $1,664,912,326,656 |
| META | $1,569,837,154,304 |
| BRK-B | $1,044,046,610,432 |
| LLY | $897,716,060,160 |
The following diagram shows the P/E ratios of the sample relative to the top 100 US market caps2. Note that, with one exception, the companies are not in the dark red zone with above P/E of 60. The exception is, of course, Tesla, which, at P/E of 400+ is 14x the average multiple.
Moreover, compared with the S&P 500, these P/E ratios are in-line with the median. The following graph shows the sample set with P/E ratio vs. Market Cap.
Excluding the one anomaly the relationship seen is that higher market caps roughly correspond to higher P/Es. Nvidia has a market cap over $5.7 trillion with a P/E of 48 while Meta has a market cap of $1.5 trillion and a P/E of 22.5.
Higher P/Es should also correspond to higher growth rates. The graph below shows the relationship between P/E and growth, both in the most recent quarter (MRQ) and trailing twelve months (TTM).
There is a loose relationship between P/E and TTM growth but not with last quarter’s growth. The one anomaly is even more prominent as it shows negative growth with exceptional valuation. Fundamentally however the relationship between P/E and growth is weak. Companies having widely divergent growth show similar P/E ratios. Alphabet for example has seen its P/E ratio in the 20s with growth in the 80s TTM and 50s MRQ.
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This might sound familiar. From 2008 to 2020 Apple was trading at a P/E ratio in the teens and low 20s while growing as fast as 80%. The logic was captured by my analogy of the goose that lays the golden eggs. Apple was able to create extraordinary products but the market considered such hits fleeting. It valued consistency over heroism. Getting on base vs. home runs. And so the P/E began to rise only once Services became more prominent. Regardless of how foreseeable this pattern was, it took a decade and is still ongoing for the pricing to catch up.
But the situation with AI companies (that is, all the big tech companies but Apple) is that their earnings today are somewhat an illusion.
An old maxim that says “earnings are an opinion while cash flow is a fact.3“
This is because Net income can be manipulated by accounting abstractions, whereas cash flow is based on bank transactions.
To wit: Net income (earnings) is calculated using accrual accounting, which relies heavily on judgment calls rather than bank balances. Companies recognize revenues the moment a contract is signed, even if the cash won’t be collected for months. Or they can dial in a delay as they desire.
Because of varying accounting policies, two identical companies with the exact same physical business can report vastly different earnings figures.
Cash flow is objective and simply tracks the actual movement of money in and out of the business. Real dollars either enter the bank account or they don’t. A company can look highly profitable on an income statement but still go bankrupt if its cash is trapped in unpaid invoices or unsold inventory.
Finally, cash flow can be strongly negative while earnings are strongly positive. This is because investment in capital equipment does not appear in the income statement.
Therefore true economic value is determined by the cash a company can actually distribute or reinvest rather than how it declares profitability based on accounting abstractions.
AI companies are not necessarily hiding behind suspect earnings but their extraordinary capital expenditures are draining their cash and thus what investors have access to.
Earnings seem to be soaring so the ratio P/E suggests a modest valuation. This is based on opinion or at least incompleteness.
We should look at a better indicator. It’s the EV/FCF ratio. We will look at this next.
- The top 10 ranking can change rapidly and it makes analysis difficult over longer time periods. The inclusion of LLY and BRK-B allow for visibility outside of the tech sector and they were in the list mid 2025. Saudi Aramco is in a completely different environment influenced by non-economic factors. ↩︎
- TSMC is absent from the table as it is US only companies. It is notable perhaps that of the top 15, three are not US companies (TSMC, Samsung and Saudi Aramco). Furthermore the top Chinese company, Tencent is 25th, valued at $532 billion and the top European company is ASML at 21st and $610 billion. ↩︎
- Attributed to economist Alfred Rappaport. ↩︎