Trimming Data In Listbox

Another issue for my contacts database for work. I have a listbox on the edit contacts form that lists all contacts in the database.

The listbox rowsource is
SELECT [ContactID], [LastName] & ", " & [NamePrefix] & " " & [FirstName] & " " & [Business/Organization] FROM tblContacts ORDER BY [LastName] & ", " & [FirstName] & " " & [Business/Organization];

Some of the contacts that are businesses or organizations, do not actually have the first and last name filled in, just the business/organization name. So what happens in the list I get all of the entries that do not have FirstName/LastName at the top of the list, with the Business name following a few spaces. The way it looks is:

, Stop & Shop Supermarkets

But I would like to trim that beginning part if there is no FirstName/LastName so that Stop & Shop Supermarkets gets sorted with the S's, like this:

Stabile, Lisa
Stop & Shop Supermarkets
Stott, Joan

Is there something I need to put in the rowsource to accomplish this? I've searched these forums for an answer, and turned up no results.

Attached, I have a screenshot of the form with the listbox.

Thanks
ScrmingWhisprs