Refer to the input text as context and select the correct relationship between 'Berkshire Hathaway' and 'Insurance' from the available options.
Options: headquarters location, industry, owned by, brand

Insurance Australia Group has formed a strategic relationship with Warren Buffett's investment giant Berkshire Hathaway that will see the US group take a 3.7 per cent stake in IAG via a $500 million placement.
industry