S&P 500 Bull Market Continues: Why US Stocks Rise Despite High Valuations

The S&P 500 reached record highs on August 15, 2026, and posted a 13 percent year-to-date gain. This continuation of a historic bull market rests on a structural foundation: the artificial intelligence supercycle, which is accelerating corporate earnings through cross-industry AI adoption.

In today's trading session (August 18, 2026), the S&P 500 is trading at 7,751.63 points with a decline of 0.40 percent—a technical correction following recent record highs that does not alter the fundamental picture.

AI Supercycle as Fundamental Anchor

J.P. Morgan Global Research forecasted on July 30, 2026, that the AI supercycle will drive above-average S&P 500 earnings growth of 13 to 15 percent for at least the next two years. According to the investment bank, this forecast provides a "credible valuation anchor" for markets in the second half of 2026.

The fundamental foundation of the bull market rests on corporate earnings—not on pure multiple expansion as in previous cycles. Technology, semiconductor, and cloud infrastructure companies have been the main drivers of this earnings acceleration. The technology sector is, according to analysis from August 15, 2026, "the undisputed engine driving the S&P 500 to its August 2026 high," with AI-related stocks posting "extraordinary gains."

This earnings dynamic distinguishes the current bull market from previous cycles and gives it, according to institutional assessments, "a degree of fundamental credibility" that institutional investors are loath to ignore.

Inflation Moderation Supports Consumer Spending

A central positive factor is the phase of inflation cooldown. The current bull market is based, according to a report from August 15, 2026, on a "virtuous cycle," in which moderating inflation supports consumer spending, which in turn strengthens corporate earnings. As long as inflation continues its downward trend without triggering a recessionary downturn, conditions for sustained stock market gains remain firmly in place.

Despite this inflation moderation, there remains persistent uncertainty about the Federal Reserve's monetary policy, as documented in a report from July 30, 2026. This uncertainty counts among the significant headwinds for the market outlook.

Iran Conflict and Energy Prices as Acute Risk

Escalating tensions around Iran represent, according to analysis from July 30, 2026, "the acutest macroeconomic risk to global markets in August 2026." Higher oil prices as a direct consequence of the geopolitical conflict constitute "a significant headwind that can compress corporate profit margins, renew inflationary pressure, and simultaneously dampen consumer spending."

The elevated energy costs caused by the Iran conflict count, according to mid-year market outlooks from multiple institutional sources, among the primary factors that could interrupt the bull market. Tariff escalation adds to these headwinds.

Short-Term Volatility with Structural Tailwinds

Quantitative forecast models present a more moderate picture than recent rally performance suggests. Current projections from July 30, 2026, estimate a gain of approximately 3 percent over the next six months—slightly below the long-term historical average. October alone is estimated at around 1.7 percent, which exceeds the monthly historical average.

Technical analysis from July 13, 2026, forecasts that volatility could persist through mid-August before a pullback in early October sets the stage for the continuation of the bull market. An analysis report from August 12, 2026, states that "short-term noise" concentrates on geopolitical tensions, inflation concerns, and an uncertain monetary path, but "the longer-term bullish trend remains intact."

Warning Signals from Technical Analysis

An analysis report from April 2026 warns of classic late-stage indicators: "This type of divergence, where the index reaches new highs while its dominant components quietly break down, is a classic warning signal for a market in the late stages of a bull run." The report documents bearish divergences between the S&P 500 index and the "Magnificent 7" stocks, which collapsed earlier.

A report from August 13, 2026, was titled "Bull Trap Just Below Record High"—a hint at possible false signals in the recent rally phase. Such technical divergences between the index and dominant components count among the risk factors that institutional observers are watching.

Rising Demand for Leveraged Products

With bullish momentum in August, demand for leveraged ETFs and bullish options rose again from both retail and institutional traders, as documented in a report from August 15, 2026. This trading activity reflects increased risk appetite in the market.

Assessment for Investors in German-Speaking Countries

For investors in German-speaking regions, the continuation of the US bull market means continued outperformance of the S&P 500 against European indices. While the DAX is trading today at 26,318.5 points with a decline of 0.53 percent, the US market benefits structurally from the AI revolution, which is less pronounced in Europe.

The currency movement between the US dollar and euro remains an additional factor for European investors with US equity exposure. The fundamental strength of US corporate earnings—driven by technological innovation—offers, however, a counterweight to short-term geopolitical and macroeconomic risks.

The limited upside of 3 percent over the next six months according to quantitative models should not lead to overly optimistic extrapolations of recent momentum. The interplay of structural AI tailwinds and cyclical headwinds defines a market environment in which selective positioning becomes more important than broad index exposure.