The current bull trend, in our opinion, began in 2009 from the low point on the S&P500 index of 676 reached on 9th March of that year. It has now been going on for over 17 years – making it the longest bull trend in the history of Wall Street by far.
On Thursday, May 14, 2026, the S&P 500 closed at a new all-time record high of 7,501 and the Dow Jones Industrial index went back above 50 000. This means the market has gone up 11-fold over the past 17 years. The question which investors have to ask themselves is, “How much further up can it go?” – and nobody really knows the answer to that question.
The historical price:earnings ratio (P:E) of the S&P500 is now just under 32 – which is well above its average level, but this does not necessarily mean that it cannot go higher. The fundamentals driving the 500 shares which make up the index are a direct function of their perceived future earnings and their potential to increase those earnings even further.
This in turn is a function of the on-going impact of new technologies like AI, and humanoid robotics on productivity levels. The problem is that during a protracted bull trend like this one, markets tend to become over-enthusiastic about that future potential, to the point where they begin to create their own momentum. Then share prices can begin to lose touch with the underlying profitability of the companies which they represent – and Wall Street is certainly moving in that direction.
A similar situation arose in the 1920’s when the new technologies of the motor car and the telephone began to become ubiquitous. These technologies impacted the profitability of all companies big and small giving rise to the “Roaring Twenties”. As Wikipedia puts it, “...the decade was characterized by economic prosperity, rapid social and cultural change, and a mood of exuberant optimism.”
The problem is that investors tend to push share prices up so high that their potential to produce concomitant profits becomes irrelevant to investors. In other words, the investors get carried away in the excitement and bid shares up to absurd and unsustainable levels. Eventually a “bigger fool” point is reached where investors buy a share, not because of its earnings potential, but because a bigger fool will buy it back from them in a few weeks for even more money. The inevitable result is a 1929-style crash.
So, we need to ask, “Is Wall Street at a similar position now?” We believe it is getting there, but not yet. The new technologies are certainly impacting profitability across the board but the upward trend has not yet become crazy. It is still linked to future profits. So, we believe that Wall Street is still at a relatively early stage in this process and that the bull trend will continue for quite a while, getting steadily more and more excessive.
Our view is that the profitability gains flowing from AI are only just beginning. We are expecting far greater gains in the future. In our view America and the world is at much the same point that it was at, say, in 1923 or thereabouts, just when the Roaring Twenties were just getting going.
Sometimes it is useful to step back from the immediate excitement of the latest all-time record highs to look at the big picture. Consider the following chart which shows the progress of the S&P500 index since the start of this great bull trend 17 years ago:
S&P500 Index : November 2008 - 15th of May 2026. Chart by ShareFriend Pro.
The chart shows the progress of the S&P500 index since March 2009. You can see there the low point of 676 followed by a very gentle upward slope until about 2016. Thereafter, the gradient increased, but not very much and it was interrupted by the COVID-19 pandemic in 2020. Bear in mind that we regard COVID-19 as an aberration, not directly related to the stock market from a technical point of view. After that came the war in Ukraine which held the market back for a time, but since then the market has been accelerating despite Trump’s two interventions. What you can see from this chart is that the market is definitely becoming exponential. It is going up faster and faster. The move from 7000 on the S&P to 8000 is definitely quicker than the move from 6000 to 7000. The chart is rising almost vertically now.
And we can only imagine where the S&P500 would be now if the Brent oil price was still at around $70 per barrel instead of close to $110. Trump’s war in the Middle East has had the effect of temporarily cooling markets, but it has been insufficient to dampen the tidal wave of investor enthusiasm for the “blue sky” potential of AI and related technologies.
It is always fun to participate in the final stages of a great bull market, but you must be aware that nothing goes up forever. Your best protection against the coming bear, whenever it happens, is to maintain a strict stop-loss strategy on all your share investments. Remember, it is acceptable to widen your stop-loss percentages when your investments are strongly in-the-money, but you can never lose sight of the fact that at some unpredictable date in the future the market will come down – so it is important to have a clear strategy that locks in your profits.

