Curious about Sirius XM's big gains last month? Here's how a long-planned restructuring took its final step in October.Shares of Sirius XM Holdings (SIRI -6.22%) rose 12.7% in October 2024, according to data from S&P Global Market Intelligence. The embattled satellite radio giant reported earnings near the end of the month, but that wasn't the needle-moving event. Instead, the stock gained more than 18% in the first two weeks of last month thanks to the completion of a corporate reorganization.How Liberty ...