UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

NOTICE OF EFFECTIVENESS

Effective Date: March 26, 2018
Accession Number: 0001193125-18-090707
Submission Type: POS AM
CIK: 0001172139
Company Name: BILL BARRETT CORP
File Number: 333-205230
CIK: 0001466850
Company Name: Circle B Land Co LLC
File Number: 333-205230-01
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