The global investment cycle is one of the longest and most powerful in modern financial history. Measured by the global stock/bond ratio — the most reliable barometer of the cycle’s direction — the current “Higher-Conviction Rally” phase is now 186 weeks old and has delivered total gains of 85%. Bull markets do not die of old age: they end when specific catalysts force investors to reprice risk. The critical question today is whether any such catalyst is imminent. Fortunately, not yet — but the risks are building and the easy money has been made.

The framework we use identifies eight phases in the global stock/bond cycle. We are firmly in Phase 5, characterised by broadening economic expansion, rising corporate profitability and strong equity outperformance relative to bonds. The hallmarks are well in evidence. The S&P 500 has reported first-quarter 2026 earnings growth of 28%, year-on-year on revenue growth of 11%, the US economy continues to expand, and the equity rally seems unstoppable. By conventional metrics, the bull market remains very much intact. But what comes next, are the bear market phases 6-8, which end the investment cycle.

History tells us that bear markets are almost always preceded by economic recessions, and recessions need a catalyst. Four potential triggers are worth monitoring: a destabilising bond market shock from sharply higher yields; a policy shock that damages corporate confidence or profitability; pre-emptive investor de-risking in the face of stretched valuations and tightening liquidity; or the deflation of an AI-driven technology bubble. None has yet materialised with sufficient force to derail the cycle — but the trajectory is concerning on more than one front.

The most immediate structural threat comes from the bond market. The US 30-year Treasury yield has reached a 19-year high of 5.18%, and the Federal Reserve’s April FOMC minutes revealed a hawkish U-turn, signalling that the rate cutting cycle is over. The core problem is structural: the developed world is more inflationary than at any time since the 1980s, with inflation running above its 2000–2020 average in all major economies. Governments are simultaneously running large fiscal deficits during an economic expansion — precisely the wrong moment — and bond markets are only beginning to demand compensation for this policy error. A sharp, disorderly rise in yields could rapidly tighten financial conditions and terminate the cycle.

Complicating the picture is a geopolitical wildcard of the first order. Whilst there is a peace deal between the US and Iran, the Strait of Hormuz crisis — through which approximately 20% of global oil trade passes — has introduced an energy shock that could amplify inflation and suppress growth simultaneously. Gasoline prices are up sharply, eating into household disposable income and affecting consumer confidence. Energy shocks of this magnitude have historically been the main cause of some of the most severe bear markets of the post-war era, and this one is not yet entirely resolved.

Valuations add a further reason for caution. The long bull market has inflated asset prices across multiple categories simultaneously: US secular growth stocks, AI-related equities, Bitcoin, gold and real estate all trade at or near historically elevated levels. The concentration of gains in a narrow cohort of mega-cap technology stocks has created a fragility that mirrors past bubble episodes. What makes this cycle particularly demanding is the dearth of attractively priced assets. Investors seeking safety face the uncomfortable reality that traditional refuges — bonds, defensive equities, real assets — offer little margin of error.

Against these risks stands a structural pillar that has supported markets through every setback of the past decade: the “buy the dip” conditioning of a generation of investors. Multiple rounds of central bank intervention between 2010 and 2020 taught markets that policy makers will always backstop risk assets. This conditioning is deeply embedded in investor behaviour and has repeatedly arrested market declines before they could develop into full bear markets. So long as corporate earnings continue to beat expectations — and they have done so with remarkable consistency — and the global economy avoids recession, the reflexive bid for equities during dips is likely to remain powerful.

The most significant portfolio implication of late-cycle dynamics is the ongoing rotation away from US mega-cap growth toward non-US markets and more diversified sector exposures. Euro area, emerging market and Japanese equities offer better relative valuations and are earlier in their respective cycles. Within the US, the evidence increasingly favours a barbell approach: industrials, financials and healthcare on one side; broad, equally weighted S&P 500 exposure on the other. The era of simply owning the US large-cap growth index and outperforming the world appears to be giving way to a more nuanced, geographically diversified posture. Capital is rotating, and investors who ignore this rotation risk significant relative underperformance.

How much longer can the cycle run? The fundamentals support continuation over a 6- to 12-month horizon, assuming the Strait of Hormuz crisis continues to de-escalate and bond yields rise gradually rather than disruptively. But the window of clear upside is narrowing. The risk asymmetry — modest additional gains against the prospect of a sharp, potentially rapid reversal — suggests that investors should be steadily reducing position sizes in extended assets, diversifying geographically, and maintaining higher-than-usual liquidity buffers. This is not the moment for maximum risk-taking; it is a moment for active management of downside exposure.

The investment cycle is mature but not exhausted. There is no obvious, imminent recession catalyst — but there are multiple realistic pathways to one, and several are becoming more plausible by the month. The bond market is the key variable to monitor. Should yields rise sharply and disorderly from already-elevated levels, the cycle could end faster than most expect. In this environment, capital preservation matters as much as return generation. Investors should continue to participate in risk assets while actively managing downside — prioritising quality, diversification and balance sheet strength over pure growth. The final chapters of a long bull market can still be rewarding, but they demand restraint.