Title insurance, kreditörlerin gayrimenkulün mülkiyeti konusundaki ihtilaflar nedeniyle oluşabilecek zararlara karşı korunması amacıyla mülkiyet tapusunun sigorta ettirilmesidir.

A contract in which an insurer, usually a title insurance company, agrees to pay the insured party a specific amount for any loss caused by defects of title on real estate in which the insured has an interest as purchaser, mortgagee, or otherwise.
www.alaskausamortgage.com/help/mtgterms.asp

Insurance that protects the lender or buyer against loss arising from a dispute over ownership of a piece of property. As with a car, the property may have changed ownership many times before reaching the current buyer, and errors and discrepancies can happen along the way. Title insurance is the lender's way of insuring their interest in the property. The cost for title insurance is paid once, at the closing of the loan.
www.realestate-resources.com/loans-ebooks/loan-definitions....

Underwriter ise sigorta poliçesini düzenleyen veya acentelerine düzenleme yetkisi veren sigortacı şirkettir

Title Insurance Underwriter - The title insurance underwriter is the entity that authorizes and issues authority for its agents to write title insurance policies. It is the entity that actually insures the property against title defects. http://www.fifthamendment.com/title-services-glossary.asp

Dolayısıyla "tapu sigorta şirketi," "tapu sigorta yüklenici," "tapu sigortacısı," vs. hepsi olur.