CF Industries Sales, LLC

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Prospectus Supplement for Primary Offering

Free Writing Prospectus

Prospectus Supplement for Primary Offering

Automatic Shelf Registration

Notice of Effectiveness

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933 (amendment)

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

TERRA NITROGEN CORP

Post-effective amendment to an automatic shelf registration statement

Correspondence with the SEC

Correspondence with the SEC

Correspondence with the SEC