The courier services giant needs to overcome some tough near-term challenges.UPS (UPS +0.28%), one of the world's largest shipping companies, went public in November 1999 at $50 per share. It was valued at$60.2 billion, making it the largest U.S. IPO of the 20th century.UPS joined the S&P 500 in 2002, and its stock reached a record high of 192.88 in February 2022. A $10,000 investment in its IPO would have grown to$38,576. That stable growth, along with its consistent dividend hikes, made it a reliable bl ...