Nov 3 (Reuters) - U.S. pipeline operator Williams Companies (WMB.N) , opens new tab missed Wall Street estimates for third-quarter profit on Monday as higher interest and maintenance costs offset gains from higher service revenues, sending its shares down more than 2% after the bell.

Williams, which owns and operates more than 32,000 miles of pipelines, placed several expansions into service during the quarter, including Transco's Alabama Georgia Connector and Commonwealth Energy Connector, and Northwest Pipeline's Stanfield South project.

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Interest costs rose to $372 million in the third quarter from $338 million a year earlier, while operating and maintenance expenses increased to $583 million.

Service revenues climbed to $2.12 billion from $1.91 billion a year ago.

The company lifted its 2025 growth capital expenditure by $500 million to a range of $3.95 billion to $4.25 billion after its roughly $1.9 billion investment in Woodside Energy's Louisiana LNG project.

Larger rival Kinder Morgan (KMI.N) , opens new tab posted a rise in third-quarter profit, helped by higher volumes of natural gas transported through its pipelines.

Tulsa, Oklahoma-based Williams reported adjusted profit of 49 cents per share for the quarter ended September 30, compared with analysts' average estimate of 56 cents per share, according to LSEG.

https://www.reuters.com/business/energy/williams-companies-profit-falls-short-estimates-higher-expenses-2025-11-03/