Praise be to Allah.
We praise Allaah for having enabled you to repent. It is well known that money is the fitnah (trial) of this ummah, so being enabled to repent from having taken people’s money unlawfully is a great blessing for which you must always thank Allaah.
In order to make your repentance complete you have to return the money to its owners. It is good that you are asking this question. We have already discussed this matter in our answer to question no. 31234, in which it stated that the one who wants to return property to its rightful owners does not have to disclose his identity to them, because the purpose is to restore the property to its rightful owner, not to know who the thief is.
Hence you should look for a suitable way by means of which you can preserve your dignity whilst also returning the property to its rightful owners without embarrassing yourself in front of the owners of this company.
And Allaah knows best.