Williams would acquire the stake from private equity firm Global Infrastructure Partners, which holds a third of the company and half of its general partner, said Bloomberg, citing people with knowledge of the matter.
Back in 2012 Williams bought a 25 per cent stake in the pipeline group and 50 per cent of its general partner and is now looking to buy the remaining 50 per cent, said the people.
Access, which has a market cap of over $13bn, provides oil and gas gathering services to Chesapeake Energy, Anadarko and other exploration companies.
GIP has $18.7bn under management and owns 12 companies with combined revenues of nearly $6bn.
The firm targets infrastructure assets in the energy, transport and water/waste sectors.
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