Energy stocks are experiencing one of their strongest rallies in years, and a return to triple-digit oil prices could extend this momentum even further.

Since 2026, the energy sector has climbed more than 43%, outpacing all other S&P 500 sectors by a wide margin. The State Street Energy Select Sector SPDR ETF, which tracks US energy equities, has clearly outperformed crude oil prices themselves over the past several months.

On Wednesday, Brent crude broke through the $100-per-barrel mark, reaching its highest level since May. That day, the S&P 500 slipped 0.5%, yet the energy sector moved higher against the trend. Major oil giants like Exxon Mobil and Chevron saw notable support in their share prices.

From a valuation standpoint, however, energy stocks have not become expensive despite the sharp rally.

According to data from Bloomberg, the energy sector remains among the cheapest in the S&P 500. Even though its earnings growth has once again become one of the strongest in the index, Wall Street still tends to view this profit surge as temporary, and therefore has not assigned a higher valuation premium to energy names.

Yet, with oil prices staying elevated, inventories declining, and spare production capacity tightening, analysts are beginning to reassess that view.

Oil Above $100 Could Drive Further Upward Revisions to Energy Earnings Forecasts

The key to this energy rally is not just the psychological milestone of oil crossing $100.

Brent's breakthrough of the $100 level reflects market concerns over ongoing Middle East conflicts and further disruptions to global supply. As inventories fall and spare capacity shrinks, the buffer that the oil market relies on to absorb supply shocks is getting thinner.

For energy companies, sustained high oil prices mean stronger upstream profits and cash flow. More importantly, if high prices last longer than the market had previously expected, Wall Street analysts may raise their earnings forecasts for energy firms in the coming quarters.

Even by the end of 2027, energy sector operating margins are projected to ease to around 15%, still well above the roughly 9% level seen before the Iran war erupted.

Therefore, what the market is currently trading is not just "short-term earnings from higher oil prices," but rather the possibility that margin improvements in energy companies could prove more durable than previously anticipated.

Energy Stocks Could Serve as a 'Safe Haven' in a High-Oil-Price Environment

Another advantage for energy stocks lies in their clear divergence from the broader market.

On September 9, after Brent crude crossed $100, US equities came under pressure, with the S&P 500 falling roughly 0.5% and the Nasdaq dropping about 0.6%. At the same time, the energy sector moved higher against the trend, providing support to large-cap names like Exxon Mobil and Chevron.

The reason lies in the starkly different impact that high oil prices have on energy companies versus other industries.

For energy firms, higher oil prices translate into improved revenues and profits. But for the broader economy, rising energy costs push up business expenses and consumer spending, reigniting inflationary pressures.

After Brent surpassed $100, the 10-year US Treasury yield briefly rose to near its highest level since October 2023, as markets began reassessing the implications of higher energy prices for inflation and monetary policy.

This also gives energy stocks a degree of relative defensiveness: if oil-driven inflation heats up, pushes bond yields higher, and weighs on the overall stock market, energy companies could paradoxically continue to benefit from high crude prices.

What the Market Really Needs to Watch Is How Long High Oil Prices Can Last

Of course, the energy sector's strong run also faces a key question: is the current high oil price merely a short-term geopolitical premium, or is it the start of a new, sustained supply shock?

If Middle East tensions ease quickly and global oil supply recovers, falling crude prices would recompress energy earnings expectations. Conversely, if conflicts persist and shipping through the Strait of Hormuz faces greater disruption, with inventories continuing to draw down, then the energy earnings recovery that the market currently views as "temporary" could last much longer.

Therefore, for energy stocks, what truly matters is not whether Brent holds above the round $100 figure, but whether the $100 oil price can be sustained, and whether corporate earnings can continue to be revised higher alongside it.

After energy stocks have already posted a multi-year outperformance, if oil prices remain elevated, margins stay high, and valuations still show little expansion, then the bull case for the energy sector may not be over yet.