U.S.–Israel attacks on Iran and Iran’s retaliatory strikes – The financial implications

You’ll have seen the weekend’s headlines about the U.S.–Israel attacks on Iran and Iran’s retaliatory strikes. This note below focuses on the financial implications and how we expect things may play out.

In Summary (60 seconds)

Markets are likely to open “risk-off” (shares down, volatility up) as investors digest the escalation.
Oil is the key swing factor. The bigger the disruption risk in the Gulf, the bigger the knock-on effect for inflation and markets.
Defence/energy may hold up better; travel, consumer and some growth areas can be more sensitive in the short term.
Our plan doesn’t change because headlines change. We build portfolios to withstand events like this.
If you’re tempted to “do something”, pause first—the biggest investment mistakes usually happen in the noisiest weeks.

The Details:

What markets tend to do in moments like this

When geopolitical risk spikes suddenly, markets typically do three things:

De-risk first, ask questions later
Investors sell risk assets (shares, smaller companies, some credit) and move toward perceived safe havens (high-quality government bonds, cash, gold). That’s the market trying to price uncertainty.
Reprice energy risk quickly
Oil can move sharply on any perceived threat to supply routes, shipping costs, insurance, or infrastructure. Even without an actual supply interruption, fear alone can add a “risk premium” to prices.
Then the market starts narrowing to the “what next?”
After the first wave of selling, returns often depend on whether the situation stabilises, escalates, or becomes a prolonged standoff.

The key driver: Oil, inflation and interest rates

If oil prices rise meaningfully and stay elevated, it can:

push up transport and energy costs,
feed into inflation expectations,
and complicate the path of future interest-rate decisions.

That matters because the market’s “valuation maths” (especially for growth shares) is highly sensitive to interest rates and inflation assumptions.

Put simply:

Short conflict / limited disruption → markets usually stabilise faster.
Prolonged tension / material disruption → higher chance of sustained volatility

How we think this may play out (base case vs. risks)

We’re watching three broad paths:

Base case: Elevated tension, but managed

Initial volatility, then markets begin to stabilise as information improves.
Oil remains higher than it was, but not disorderly.
Portfolios behave largely as designed: diversified holdings and high-quality assets help cushion the bumps.

Upside case: Faster de-escalation

Oil retreats, risk appetite returns, and markets recover more quickly than expected.
Historically, when uncertainty lifts, markets can rebound sharply—often before the news “feels” better.

Downside case: Escalation and/or shipping disruption

Oil spikes and stays higher.
Volatility persists, and markets can re-test recent lows.
The focus shifts from “geopolitics” to “growth/inflation trade-offs”.

What We Are Doing

At Lexington, we don’t react to headlines — we respond to your plan.

We are not taking any action with your investments at this time. Your portfolio is already designed to withstand periods of uncertainty like this.

If you expect to need access to money within the next five years, that portion of your wealth should be held in fixed income or cash, not invested in the stock market. This is a core principle of your financial plan and helps protect you from short‑term market noise.

If anything materially changes that affects your long‑term plan, we will contact you.

What we recommend you do (and not do)

Do:

Stay focused on your long-term plan. Your portfolio is designed for events like this.
Remember the timeframe that matters. One week of headlines rarely changes a 10–30 year outcome.
Contact us if you’re worried. A short conversation can stop an expensive mistake.

Don’t:

Don’t make big portfolio changes based on breaking news.
Don’t judge progress by “one-month numbers.”
Don’t confuse uncertainty with permanent loss.

The key benchmark (the only one that matters)

The benchmark isn’t whether markets are up or down this week.

It’s whether you remain on track to achieve your financial and life goals, and not run out of money.

As always, we’re here if you want to talk this through.

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