$Apple(AAPL.US) Apple has been Berkshire Hathaway's largest holding for a long time, even though the conglomerate has trimmed its position in the iPhone maker in recent years (but not during the second quarter). Buffett once said that Apple is probably the best business in the world. That's high praise, and it's entirely warranted. Apple generates consistent earnings and cash flows thanks to its popular devices, especially the iPhone. The iPhone almost functions like a subscription that hundreds of millions of people renew every few years. Apple's customers are highly loyal. Because the iPhone has unique features and ways to interact with other devices within the company's ecosystem -- not to mention the large amount of data that is a pain to transfer to a competitor's platform -- Apple boasts a wide moat from high switching costs.The company still has significant growth opportunities. For instance, Apple has been integrating artificial intelligence (AI) features to improve its devices. This could help increase renewal rates and even bring new people into its ecosystem. Apple has an advantage, as it boasts more than 2.5 billion active devices in circulation, enabling it to distribute AI services very rapidly, including via software updates. With Apple now well positioned to finish the year strongly amongst the Mag 7 companies, I'm holding on to my current shares and perhaps look to add if it does pull back more. @Captain's Treasure