Williams Cos. is closing in on a $5.5 billion acquisition of natural gas pipeline operator Momentum Midstream, according to people familiar with the matter. The Tulsa-based energy company is finalizing terms to purchase Momentum from private equity firm En Cap Flatrock Midstream, with a deal potentially announced within a week. Williams closed Friday at $77.92, giving it a $95 billion market valuation.

The transaction would significantly expand Williams' pipeline footprint, adding Momentum's 4,000-mile network that serves 10 LNG facilities and 26 power plants. Momentum's management has built the business by acquiring assets across East Texas and Louisiana, positioning it strategically in the Haynesville shale region. This area represents one of America's most productive natural gas plays, supplying growing export demand along the Gulf Coast.

The deal would strengthen Williams' capacity to transport gas from the prolific Haynesville fields to export terminals, supporting America's LNG export expansion. The US already leads global LNG shipments and is positioned to double international volumes by decade's end as new terminals come online in Texas and Louisiana. The acquisition represents a major bet on continued growth in energy exports.

For investors, this signals consolidation accelerating in midstream energy infrastructure as companies position for the energy transition. The acquisition would create a more integrated pipeline system connecting production to export markets, potentially improving margins through operational synergies and increased throughput volumes.