Utilize the input text as a context reference, choose the right relationship between Investec and LONDON from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

LONDON (ShareCast) - (ShareCast News) - Glencore (Xetra: A1JAGV - news ) shares tumbled on Monday on the back of a fairly downbeat assessment from Investec (LSE: INVP.L - news ) , which warned the stock holds little value for shareholders.

Answer: headquarters_location