Refer to the input text as context and select the correct relationship between 'Investec' and 'LONDON' from the available options.
Options: position held, headquarters location, parent organization, product/material produced

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.
headquarters location