Amazon, the e-commerce giant that has changed how much of the world shops for books, toilet paper, and TVs, hit a new milestone on Tuesday as its stock topped $1,000 for the first time. That price puts Amazon's market value at about $478 billion, reports the AP, double that of rival Walmart and more than 15 times the size of Target. And its four-digit stock price places it in rare company: Only four other US-listed companies have shares that trade above $1,000, and the only other S&P 500 company valued at more than $1,000 a share is Priceline, which traded at about $1,863 on Tuesday. NBC News notes that Amazon beat Alphabet over the $1,000 line. (More Amazon stories.)