SWANSEA MP Sian James has forced a House of Commons debate on the future of the Land Registry.
The coalition government has announced that it wants to create a new company to run the land registration business.
There are fears that this will lead to job losses among the 430 workforce at the Swansea office based at the Enterprise Park.
Speaking at Welsh Questions, Mrs James asked ministers to explain why a publicly owned organisation, which makes an £98.8 million annual surplus for the taxpayer, was now being considered for a state sell-off.
Although she was given assurances that no decision on the "right commercial model" had yet been made, parliamentary measures have allowed for an adjournment debate on February 25 so that Mrs James and colleagues can press the government to fully explain its intentions.
Mrs James said she was "deeply concerned" about the plans and their impact on the Llansamlet office.