UNP vs CSX — which stock performed better?

Union Pacific Corporation (UNP) versus CSX Corporation (CSX), Industrials, on 2026-08-20.

Result

Union Pacific Corporation (UNP) performed better on 2026-08-20. UNP moved 2.960%, CSX moved 0.880%.

Why these two companies

A federal Surface Transportation Board review of Union Pacific's proposed $85 billion acquisition of Norfolk Southern resumed on August 18, 2026, keeping UNP shares in headlines even as they held near $299. That regulatory overhang has fed an active analyst debate framing rival CSX as the steadier, deal-risk-free pick in the same rail sector, making this the timeliest railroad matchup on the board.

The research

Union Pacific runs freight trains across the western United States and is trying to buy Norfolk Southern to create one railroad that spans the whole country. CSX runs freight trains across the eastern United States and is not part of any pending merger. One reason to like Union Pacific is that if its big merger deal is approved, the combined company could become more efficient and valuable over time. One reason to like CSX is that its business isn't tied up in a giant, uncertain merger review, so its results are easier to predict. Something to keep in mind: a government transportation board just restarted its review of Union Pacific's merger plan on August 18, 2026, and how that plays out could swing Union Pacific's stock more than any single day of normal business news.