An insurance company's headquarters, where most of the functional areas'such as underwriting, claim administration, customer service, actuarial, marketing, accounting, legal/compliance, and human resources'are located. See also regional office.
www.woodmen.org/inside.cfm

headquarters: (usually plural) the office that serves as the administrative center of an enterprise; "many companies have their headquarters in New York"
wordnetweb.princeton.edu/perl/webwn

The principal place of business of a savings institution; the location registered with the Office of Thrift Supervision as an institution's primary office.
www.ncbuy.com/credit/glossary.html

The place where a surety company maintains its executive and general supervisory departments.
suretypros.net/index.php/info/surety-definitions

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Note added at 13 mins (2010-08-05 18:27:28 GMT)
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Seria a sede da empresa, seu escritório central