A while ago, I was analyzing which were truly the best companies to invest in the stock market in 2023, and what I found was quite interesting. That year was marked by simultaneous technological revolutions that we had rarely seen before: AI exploded with ChatGPT, renewable energies accelerated their adoption, and electric vehicles began flooding global markets. For those who knew where to look, investment opportunities were enormous.

The first thing I noticed was that not all tech companies were winning. While some lagged behind, others positioned themselves at the forefront of this new digital era. The economic context was not easy: high inflation, limited access to credit, geopolitical tensions. But precisely in these moments of radical change is where markets offer the greatest gains for those who identify the right trends.

Microsoft was the big winner of that period. The interesting thing was its strategy: since Satya Nadella took control, the company diversified its dependence from Windows toward cloud services and AI. Its bet on OpenAI positioned it a step ahead, integrating ChatGPT into Edge, Bing, and Office. This directly translated into spectacular stock market results.

Nvidia also caught my attention because of its different approach. While Microsoft and Google developed AI software, Nvidia bet on hardware: GPUs optimized to run those AIs. This early decision made them essential providers of the revolution, which consistently boosted their shares.

In the tech sector, Alphabet and Tencent were also present. Alphabet faced pressure because Microsoft got ahead with ChatGPT, although its AI Bard had potential to regain ground. Tencent, for its part, took advantage of Microsoft's problems in gaming (the acquisition of Activision Blizzard faced legal obstacles) to expand its position in portable consoles.

Xiaomi was another fascinating case. Its profit figures were modest at that time, but the company was making solid steps into new markets, especially electric vehicles. Its investment in R&D and its strategy of quality products at competitive prices made it one of the best companies to invest in with a medium-term vision.

Now, if we talk about renewable energies, Iberdrola was the clear reference. The European energy tension of 2022 had accelerated the transition, and Iberdrola, as the main producer of renewables in Europe, benefited directly. Its bet on solar and wind kept growing, boosting both profits and stock price.

In the automotive sector, BYD and Tesla dominated the landscape. BYD was achieving almost unprecedented sales figures with affordable and functional electric vehicles. Tesla, although its shares had fallen due to Elon Musk’s eccentricities and other factors, maintained its position as the manufacturer with the highest market capitalization. Its gigafactories allowed it to reduce costs and offer more competitive vehicles.

For those seeking exposure to the EV supply chain, Tianqi Lithium was the obvious bet. With lithium prices moderate during that period and projected demand set to grow, this Chinese producer with high production volume appeared as an interesting medium-term opportunity.

I cannot forget to mention Siemens, which, although it sounds boring, is massively important. Its industrial technology supports processes in over 200 countries, and it also strongly invested in renewable energy plants. Its generous dividend made it attractive for more conservative investors.

What I found crucial at that moment was understanding that AI was not just a passing hype. ChatGPT took just a couple of months to distort multiple markets, and its impact was just beginning. The success or failure in developing marketable AI systems was going to translate into drastic stock market changes for the main tech companies.

Of course, macro factors could change the game: the war in Ukraine, OPEC decisions on oil production, post-pandemic inflation control. But the reality was that the energy transition continued accelerating, clearly benefiting clean companies and electric vehicle manufacturers.

Looking back, the best companies to invest in the stock market in 2023 were those positioned in the three key trends: AI, clean energies, and transportation electrification. It wasn’t difficult to identify them if you paid attention to where the money was really moving.