Billionaire Bill Ackman Is Buying Microsoft Stock. Is It Still the Best Artificial Intelligence (AI) Buy Today?

Microsoft's stock has been a volatile investment in 2026, remaining relatively stagnant for the year. Despite the S&P 500 delivering over 10% returns, Microsoft has underperformed. However, those who purchased shares during dip periods, such as April or late June, have seen a 30% gain. This starkly contrasts with the initial year's investment timeframe.

Bill Ackman, a prominent hedge fund manager, recently boosted his stake in Microsoft by nearly 10%, making it the third-largest holding in his portfolio, constituting nearly 12% of the fund's total assets. This substantial endorsement indicates his faith in Microsoft's future. However, given the stock's recent surge, the question remains - is Microsoft still the optimal Artificial Intelligence (AI) investment?