Rolls Royce Submarines has won an £800 million contract aimed at delivering and supporting the UK's nuclear fleet - and with it 2,000 jobs.
The 10-year "foundation contract" is the first of three deals the Ministry of Defence (MoD) is expected to sign.
Across the programme, up to £900 million of savings are planned, with costs due to be £200 million lower as a result of this deal, Defence Minister Philip Dunne told the Commons on Wednesday afternoon.
In a written statement to MPs, Mr Dunne said the contract covered the overhead, running and business costs at Rolls-Royce Submarines sites.
He said the new deal consolidated costs, focussed on efficiency and secured future terms and conditions between the firm and the MoD.
And he said: "The foundation contract will help sustain around 2,000 jobs at Rolls-Royce Submarines in the UK, which provides a unique national strategic capability that has a vital role to play in meeting the present and future defence and security needs of the UK."
10 biggest companies in the world
Rolls Royce wins defence contract
Wal-Mart Stores, or Walmart, is an American retailer that runs chains of discount department and warehouse stores around the world.
The company was founded by Sam Walton in 1962, incorporated on October 31, 1969, and first traded on the New York Stock Exchange in 1972. It is headquartered in Bentonville, Arkansas and has around 8,500 stores in 15 countries, under 55 different names.
Royal Dutch Shell, more commonly known as Shell, is a global oil and gas company headquartered in Holland, but with its registered office in London.
With operations in more than 90 countries, it is active in every area of the oil and gas industry, including exploration and production, refining, petrochemicals, power generation and trading.
Exxon Mobil Corporation, or ExxonMobil, is an American oil and gas corporation formed on November 30, 1999, by the merger of Exxon and Mobil. Its headquarters are in Irving, Texas.
With 37 oil refineries in 21 countries, Exxon Mobil Corporation is the largest refiner in the world.
BP is yet another global oil and gas company, this time headquartered in London. It has operations in more than 80 countries, produces about 3.8 million barrels of oil per day and has 22,400 service stations worldwide.
The name BP is derived from the initials of one of the company's former legal names, British Petroleum.
Sinopec Group is one of the major petroleum companies in China, headquartered in Beijing.
Its business includes oil and gas exploration as well as the production and sales of petrochemicals and chemical fibres.
China National Petroleum Corporation is a state-owned fuel-producing corporation and the largest integrated oil and gas company in China. It has its headquarters in Beijing.
CNPC - the parent company of PetroChina - was created in 17 September 1988 when the government decided to disband the Ministry of Petroleum and create a state owned company to handle all Petroleum activities in China.
State Grid Corporation of China is the largest electric power transmission and distribution company in China, once again headquartered in Beijing.
It has subsidiaries in Northern China, Northeastern China, Eastern China, Middle China and Northwestern China.
Toyota Motor Corporation, more commonly known simply as Toyota, is a multinational automaker headquartered in Toyota, Japan.
The company was founded by Kiichiro Toyoda in 1937 as a spinoff from his father's company Toyota Industries. Its brands include Toyota, Lexus and Daihatsu.
Japan Post Holdings is a state-owned Japanese company that deals with mail delivery and financial services.
It is headquartered in Tokyo and was founded on January 23, 2006.
Chevron Corporation is an American energy company headquartered in San Ramon, California.
It is active in more than 180 countries and is engaged in every aspect of the oil, gas, and geothermal energy industries, including exploration and production, and power generation.