I don't think so. This is what is written in xm.com's risk disclosure:my broker have negative balance protection meaning traders only lose up to their DEPOSITED amount .
(item 2.5 of the risk disclosure). They don't specify how much those "additional commissions and other expenses" may be, but it goes beyond and above your deposit.If the underlying instrument movement is in the Client’s favor, the client may achieve a good profit, but an equally small adverse market movement can not only quickly result in the loss of the Clients’ entire deposit but also any additional commissions and other expenses incurred.