The Motley Foolยท2025-09-24 00:05Group 1: Recent Purchases by Billionaires - Warren Buffett's Berkshire Hathaway made significant purchases in UnitedHealth Group and Nucor during the quarter ending June 30 [5][6] - UnitedHealth's stock has dropped due to investigations and allegations, but Buffett sees potential as the company meets Medicare Advantage enrollment targets [6] - Nucor, a major low-cost steelmaker, is strategically diversifying into building parts for data centers, presenting a favorable entry point for long-term investors [7] Group 2: Bill Ackman's Investments - Bill Ackman of Pershing Square Capital Management invested heavily in Amazon and Alphabet, with a concentrated portfolio of only 12 holdings valued at $13.7 billion [8] - Amazon continues to grow, with second-quarter net sales up 13% year over year, driven by its marketplace and AWS [8] - Alphabet is leveraging AI to enhance its search revenue growth, countering concerns about AI threatening its market position [9] Group 3: Stanley Druckenmiller's Strategy - Stanley Druckenmiller's Duquesne Family Office focused on Entegris and Microsoft as top purchases in the second quarter [10] - Microsoft shows strong growth potential with a diverse portfolio, including Office, Azure, and Xbox, reporting fourth-quarter revenue up 18% year over year [11] - Entegris supports the semiconductor industry with purification solutions, positioning itself as a critical player in the fast-growing chip market [12]