Arm Holdings (ARM -0.30%) has emerged as one of the top semiconductor and artificial intelligence (AI) stocks on the market today. After going public in 2023, the stock soared as investors realized it had more exposure to AI than they initially believed. Today, Arm stock is expensive, trading at a price-to-sales ratio of 38, but it also has a robust set of competitive advantages that set it apart from any other stock in its industry.There are two things that are unique about Arm. First, its business model i ...