In our latest comparison of market capitalizations, both Clean Energy Leaders and the world’s largest Oil Majors delivered significant gains, highlighting a changing and increasingly complex global energy landscape. Over the five-year period from September 30, 2021, through September 30, 2026, four of the five Clean Energy Leaders increased in value. Iberdrola recorded the strongest percentage growth among the group, with its market capitalization increasing 147.8% over the five-year period, rising from $61.3 billion in 2021 to $151.9 billion in 2026. CATL followed with a 90.7% increase to $199.7 billion, while Tesla – the largest company in the comparison – grew 88.2% to $1.4 trillion. NextEra Energy posted more modest growth of 2.5% to $158 billion, while BYD was the only company to decline, falling 1.8% to $87.7 billion.

  
The Oil Majors also delivered substantial gains, led by ExxonMobil, whose market capitalization increased 168.7%, from $249 billion to $669.2 billion. As of September 30, Chevron stood at $403.5 billion, Shell at $270.7 billion, TotalEnergies at $191.2 billion, and BP at $112.8 billion. Oil Majors held three of the five largest market caps in our annual analysis. Their recent performance has been boosted by higher oil prices and supply disruptions stemming from the conflict with Iran, highlighting the historic volatility of oil and gas markets and the potential for the picture to shift again as geopolitical conditions and commodity prices change. At the same time, the scale of Tesla, CATL, Iberdrola, and other Clean Energy Leaders demonstrates how firmly electrification, energy storage, renewable power, and related infrastructure have become established parts of the global economy – with high and volatile fossil-fuel prices further accelerating the transition toward electrification and greater energy independence.