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Relationship with Porsche and the Volkswagen Law

Volkswagen has always had a close relationship with Porsche, the Zuffenhausen -based sports car manufacturer founded in 1931 by Ferdinand Porsche, the original Volkswagen designer and Volkswagen company co-founder, hired by Adolf Hitler for the project. The first Porsche car, the Porsche 64 of 1938, used many components from the Volkswagen Beetle. The 1948 Porsche 356 continued using many Volkswagen components, including a tuned engine, gearbox and suspension.

The two companies continued their collaboration in 1969 to make the VW-Porsche 914 and Porsche 914-6. (The 914-6 had a 6-cylinder Porsche engine, and the standard 914 had a Volkswagen engine.) Volkswagen and Porsche would collaborate again in 1976 on the Porsche 912 -E (the USA only) and the Porsche 924, which used many Audi components and was built at Audi's Neckarsulm facilities. The 924 was originally designated for AUDI. Most Porsche 944 models were built there, although they used far fewer VW components.

The Porsche Cayenne, introduced in 2002, shares its entire chassis with the Volkswagen Touareg and Audi Q7, and is built at the same Volkswagen factory in Bratislava that the other SUVs are built.

In September 2005, Porsche announced it would increase its 5% stake in Volkswagen to 20% at a cost of €3 billion, with the intention that the combined stakes of Porsche and the government of Lower Saxony would ensure that any hostile takeover by foreign investors would be impossible. Speculated suitors included DaimlerChrysler, BMW, and Renault. In July 2006, Porsche increased their ownership again to 25.1%.

On 4 March 2005, the European Commission brought an action against the Federal Republic of Germany before the European Court of Justice, claiming that the Volkswagen Law, which prevents any shareholder in Volkswagen from executing more than 20% of the total voting rights in the firm, was illegally restricting the flow of capital in Europe. On 13 February 2007, Advocate General Dámaso Ruiz-Jarabo Colomer submitted an opinion to the court in support of the action. This again opened the possibility of a hostile takeover of VW and so on 26 March of the same year Porsche took its holding of Volkswagen shares to 30.9%. Porsche formally announced in a press statement that it did not intend to take over Volkswagen, but intended the move to avoid a competitor's taking a large stake and to stop hedge funds from dismantling VW. As expected, on 22 October 2007, the European Court of Justice ruled in agreement with Ruiz-Jarabo and the law was struck down. In October 2007, the European Court of Justice ruled that the VW law was illegal because it was protectionist. At that time, Porsche held 31% of VW shares – although a smaller proportion of voting rights, due to the Volkswagen Law – and there had been speculation that Porsche would be interested in taking over VW if the law did not stand in its way. The court also prevented the government from appointing Volkswagen board members. The German government then rewrote the Volkswagen law, only to be sued again. In October 2013, the EU Court of Justice in Luxembourg ruled that the rewritten Volkswagen law "complied in full" with EU rules.

On 26 October 2008, Porsche revealed its plan to assume control of VW. As of that day, it held 42.6% of Volkswagen's ordinary shares and stock options on another 31.5%. Combined with the state of Lower Saxony's 20.1% stake, this left only 5.8% of shares on the market—mostly with index funds that could not legally sell. Hedge funds desperate to cover their short positions forced Volkswagen stock above one thousand euros per share, briefly making it the world's largest company by market capitalisation on 28 October 2008. By January 2009, Porsche had a 50.76% holding in Volkswagen AG, although the "Volkswagen Law" prevented it from taking control of the company.

On 6 May 2009, the two companies decided to join, in a merger.

On 13 August, Volkswagen Aktiengesellschaft's supervisory board signed the agreement to create an integrated automotive group with Porsche led by Volkswagen. The initial decision was for Volkswagen to take a 42.0% stake in Porsche AG by the end of 2009, and it would also see the family shareholders selling the automobile trading business of Porsche Holding Salzburg to Volkswagen. In October 2009 however, Volkswagen announced that its percentage in Porsche would be 49.9% for a cost of €3.9 billion (the 42.0% deal would have cost €3.3 billion). On 1 March 2011, Volkswagen has finalised the purchase of Porsche Holding Salzburg (PHS), Austria's leading specialty automobile distributor, for €3.3 billion ($4.55 billion).

In January 2020, Volkswagen was overtaken by Tesla, Inc. as the second-most valuable auto maker.