By Krystal Hur

Class A shares of Berkshire Hathaway, owner of BNSF Railway, reversed earlier gains on Thursday after a federal regulator pushed pause on its review of the blockbuster merger between Union Pacific and Norfolk Southern.

BNSF, which competes with Union Pacific in the Western U.S., has previously said that the proposed merger will "concentrate too much control of the nation's freight market with one railroad leading to long-term harm to competition and resilience in the nation's supply chain."

"BNSF remains firmly opposed to the proposed UP-NS merger," the Berkshire-owned railroad said in a statement on Thursday. "We will continue to participate constructively in the proceeding."

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May 28, 2026 15:23 ET (19:23 GMT)

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