According to Collins Robert it is "transferable"


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Based on the sources quoted below, I'd say you're right if this relates to an UCITS = OPCVM structure.

This is official EU terminology:

English - UCITS = undertaking for collective investment in transferable securities
French - OPCVM = organisme de placement collectif en valeurs mobilières
German - OGAW = Organismus [Organisation] für gemeinsame Anlage(n) in Wertpapieren

or alternatively, depending on context: investment in moveables
or more to the point (depending on context): investments in stocks and short-term securities

here's what it means in French:

Le financement de tout type d'investissement mobilier

du matériel de transport,
des engins de travaux publics et de manutention,
des machines-outils,
du matériel d'arts graphiques,
du matériel médical,
des machines agricoles…

mobilier here means a capital good, period....an investissement can be spending or expenditure. It really depends on your context BUT in English when you say investment in capital goods, it does not mean you are getting a return as in the stock market..

my three previous colleagues are off the mark here I regret...

it's only investment in the sense that a company might be a leasing company where it leases capital goods OR an individual company might say it invested x amount in capital goods to improve production or efficiency but in that case investment means expenditure or investment in its own infrastructure not a market tranaction.

cheers

It means just that. As opposed to investissement immobilier which is real estate.

The term 'mobilier' probably originated from the fact that a stack of papers you can take with you :) as opposed to a house.

You can just leave it as 'securities' if the context helps, or say a couple of times something like, 'some of the investment/capital is tied up in securities (stocks/bonds)' and later on just use 'securities', the reader will be educated already.

As opposed to investment in real property.
In the absence of a more detailed context, it really is impossible to know for sure what the term stands for. Some of the other answers are just as likely to be right. What is sometimes known as "transferable" securities (although "ngotiable" sounds better to me in US English, are called "valeurs mobilières" and, given your explanation, it is possible that "investissement mobilier" actually stands for "investissement en valeurs mobilières" although this may be stretching it a little.