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.
In the context of the input sentence, determine the relationship between 'Investec' and 'LONDON'.
Options: product/material produced, parent organization, headquarters location, position held