What happened
The FTSE 100, the index of the hundred largest companies listed in London, traded at around 10,824 points, up 0.29 percent and close to its highest levels on record. The move came as part of a broadly positive week across developed markets.
In the United States the Dow Jones Industrial Average rose 0.29 percent, the S and P 500 gained 0.62 percent and the Nasdaq Composite jumped 1.27 percent. The Dow closed higher for a third consecutive session. The immediate trigger was a retreat in US Treasury yields, which reduces the discount applied to future corporate profits and therefore lifts share valuations, particularly for technology companies whose earnings sit further in the future.
Semiconductor shares led the advance as investors positioned ahead of Nvidia results and the monthly PCE inflation data. Not everything rose: Hormel Foods was among the weakest performers in the S and P 500, with earnings hit by lower turkey and nut prices, a reminder that commodity swings cut both ways for food producers.
The FTSE 100 rally has a different composition to the American one. London is weighted towards banks, energy, mining and consumer staples rather than technology, and much of its revenue is earned in dollars, so a softer pound tends to flatter the index in sterling terms.
Why it matters
Index levels are the most visible measure of how the savings of ordinary people are performing. Roughly ten million people in Britain are enrolled in workplace pensions through automatic enrolment, and the default funds those pensions use are dominated by global and UK equity trackers. When these indices rise, millions of balances rise with them, mostly unnoticed.
The driver here is worth understanding because it is not about company performance. Yields fell, so shares rose. That is a valuation effect rather than an earnings effect. Markets that rise because borrowing costs fell are more fragile than markets that rise because profits grew, since the same mechanism reverses just as quickly when yields climb again.
The FTSE 100 reaching record levels also carries a longer story. London has spent much of the past decade being described as cheap, unloved and structurally disadvantaged by its lack of large technology companies. A sustained rally raises the question of whether the discount to global markets is finally narrowing, or whether this is simply the dollar and commodity cycle doing the work.
For the wider economy, rising equity markets support consumer confidence among those who own shares and make it easier for companies to raise capital. Both effects are modest but real, and both run in reverse during a sustained fall.
Explained simply
A share price is the price of a future income stream. Bond yields are the exchange rate between money today and money later. When yields fall, money later becomes worth more, and every share on the market quietly gets an upgrade.
Work through it slowly. If you buy a share, you are buying a claim on the profits that company will make over many years. To decide what that claim is worth today, investors mentally shrink those future profits, because a pound arriving in ten years is worth less than a pound arriving now. That shrinking is called discounting.
The rate used to discount is anchored on what you could earn risk free by lending to the government instead. If a ten year government bond pays 5 percent, that is the bar every share has to clear. If the bond yield falls to 4.5 percent, the bar drops, future profits shrink less, and the calculated value of every share rises without a single company selling anything extra.
This is why technology shares move most. A mature bank earns most of its profits soon. A high growth technology company earns most of them far in the future, so the discount rate matters far more to its valuation. That is exactly why the Nasdaq rose 1.27 percent while the Dow managed 0.29 percent.
The FTSE 100 sits at the other end of that spectrum, which is why it moves less in both directions. It is full of banks, oil majors and miners whose profits arrive now, and whose dividends make up a larger share of total return.
What it means for you
If you hold a FTSE 100 tracker, the practical point is dividends. The index yields substantially more than the S and P 500, and the majority of long run FTSE returns have historically come from reinvested dividends rather than the index level. Make sure you hold an accumulation share class, or that dividends are being reinvested, otherwise you are leaving most of the return on the table.
If your pension default fund is a global equity tracker, understand that you are heavily exposed to the United States and to a handful of technology companies within it. Most default funds are around 60 to 70 percent US weighted. That has been an excellent place to be, but it is a concentrated bet rather than a diversified one.
Do not chase a rally. Buying after a strong run is how most private investors end up with poor timing. Regular monthly contributions into an ISA or pension remove the decision entirely and buy more units when prices fall, which is when it matters.
If you are close to needing the money, within roughly five years, a market near record levels is a reasonable moment to review how much sits in equities. Rebalancing towards cash or short dated bonds after a strong run locks in gains and is far easier than doing it after a fall.
The bigger picture
Records are less meaningful than they sound. Because stock markets rise over long periods, they spend a great deal of time at or near record levels, and a new high is not by itself a signal of overvaluation. What matters is the price paid relative to earnings, and on that measure London remains cheaper than New York.
The next set of catalysts are clear enough. The Federal Reserve meets on 15 and 16 September with markets genuinely divided on the outcome, and the UK budget lands in November. Either could reset the yield picture that is currently supporting share prices.
Watch the relationship rather than the level. If yields rise again and equities hold up, that would suggest the rally is being driven by earnings expectations rather than by cheap money. If shares fall the moment yields tick higher, the market is telling you exactly what it is built on.
