In the context of the input sentence, determine the relationship between 'IP Group' and 'LONDON'.
Options: stock exchange, headquarters location, platform, industry

LONDON (ShareCast) - (ShareCast News) - IP Group (LSE: IPO.L - news ) has made a £50.3m fair value gain in the value of its stake in portfolio company Oxford Nanopore Technologies after the Oxford University spin-out venture raised £70m in a new financing round.
headquarters location