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IF it was real property then you want to record the sale in the county records where the property is located. You may also have a capital gains tax that is owed to the IRS. You should discuss that with your accountant/cpa. I assume you have the asset under some corporate entity in Texas?
Nothing really. It is a private sale of assets not publicly traded securities. I'd need to review the paperwork to be sure all things are in order, but an asset purchase agreement is fairly simple. As for the stock purchase you need to look at your bylaws and see how to effectuate a sale so that one of your shareholders does not cry foul down the road.
a phone call may allow me to review all documentation and assist with the sale.