What is the relationship between 'IP Group' and 'LONDON' in the context of the input sentence.
Options: platform, stock exchange, headquarters location, 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