American billionaire Bill Ackman isn’t afraid to make big bets on individual businesses. Currently, his FTSE 100 fund Pershing Square Holdings is invested in less than 15 stocks.

Recently, I was exploring Ackman’s stock portfolio to see where he’s invested right now. Here’s a look at two companies he’s invested in that are worth highlighting.

Huge long-term potential

Ackman has invested in some world-class companies. But one that stands out to me is Uber (NYSE: UBER).

I’m sure you’re familiar with this company. If you’re not, it operates the world’s top rideshare and food delivery platform.

In my view, this company has the potential to be a brilliant long-term investment (I hold it myself). For starters, there’s substantial growth potential here. In the years ahead, we can expect Uber to expand into new geographic markets, offer new mobility/delivery services, and partner with self-driving car companies. We can also expect to see digital advertising revenues climb steadily.

Secondly, management is targeting strong earnings growth in the years ahead. This is expected to be driven by solid revenue growth, margin expansion, and share buybacks.

Additionally, Uber has a strong brand, a huge market share, an enormous user global base (that’s relatively affluent), a top-notch CEO in Dara Khosrowshahi, and a solid balance sheet.

As for the valuation, it looks reasonable — if not cheap — today. Currently, the forward-looking price-to-earnings (P/E) ratio using the 2026 earnings per share forecast is just 25.

It’s worth noting that Ackman stated in a recent investor presentation that he believes the share price could more than double over the next three to four years. If he’s right, investors could be looking at attractive returns in the years ahead.

Of course, there are no guarantees that this stock will do well. One big risk is competition from Tesla, which is trying to roll out self-driving taxis.

Overall though, I believe there’s a lot to like about Uber. I think it’s worth considering as an investment today.

1.5bn monthly users

Another Ackman stock I like the look of right now is Alphabet (NASDAQ: GOOG). It’s the owner of Google and YouTube.

This company is having to deal with disruption to its business model today. In recent years, generative AI apps like ChatGPT have changed the way that people search for information.

I believe the company has the ability to navigate this disruption successfully, however. Recently, it has been having success with its ‘AI Overviews’ feature, which now has 1.5bn monthly users (the company is introducing ads here).

It’s also having a lot of success in other areas of the business such as YouTube and cloud computing. Cloud revenues, for example, grew 28% in the first quarter of 2025.

At present, Alphabet stock trades on a forward-looking P/E ratio of just 17. To my mind, that’s a steal.

There are plenty of risks here, including the disruption to its business model mentioned above and a drop in advertising spending due to economic weakness. I think the risk/reward set-up is attractive at current levels, however, and that the stock is worth considering today.