TMUS is trading 4.1% up at $189.25, driven by the Federal Communications Commission's approval of a significant spectrum swap. The FCC approved T-Mobile's exchange of 800 MHz licenses for Grain Management's 600 MHz holdings and $2.9 billion in cash, providing a strong company-specific catalyst. This move extends a multi-day rebound for the stock, which is outperforming major indices trading down today.