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  <p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">UNITED STATES<br>
  SECURITIES AND EXCHANGE COMMISSION<br>
  </font></b><font size="2" style="font-size:10.0pt;">WASHINGTON, D.C. 20549</font></p>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">FORM&nbsp;8-K</font></b></p>
  
  <p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></b></p>
  
  <p style="font-size:12.0pt;margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT </font></b><br>
  <b>Pursuant to Section&nbsp;13 OR 15(d)&nbsp;of The
  Securities Exchange Act of 1934</b></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event
  reported):&#160; <b>May&nbsp;27,
  2008</b></font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">CF Industries Holdings,&nbsp;Inc.<br>
  </font></b><font size="2" style="font-size:10.0pt;">(Exact name of Registrant as specified in its charter)</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware</font></b><font size="2" style="font-size:10.0pt;"><br>
    (State or other jurisdiction<br>
    of incorporation)</font></p>
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">001-32597</font></b><font size="2" style="font-size:10.0pt;"><br>
    (Commission File No.)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">20-2697511</font></b><font size="2" style="font-size:10.0pt;"><br>
    (I.R.S. Employer<br>
    Identification Number)</font></p>
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
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  <p style="margin:0in 0in .0001pt;"><font size="3" face="Times New Roman" style="font-size:12.0pt;">&nbsp;</font></p>
  
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    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">4 Parkway North, Suite&nbsp;400<br>
    Deerfield, IL</font></b></p>
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal<br>
    executive offices)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">60015</font></b><font size="2" style="font-size:10.0pt;"><br>
    (Zip Code)</font></p>
    </td>
   </tr>
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s telephone number, including area
  code:&#160; <b>(847)
  405-2400</b></font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#160;(Former name or former address if changed
  since last report)</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check
  the appropriate box below if the Form&nbsp;8-K filing is intended to
  simultaneously satisfy the filing obligation of the registrant under any of the
  following provisions (<u>see</u> General Instruction A.2. below):</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&#160; Written communications pursuant to Rule&nbsp;425
  under the Securities Act (17 CFR 230.425)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&#160; Soliciting material pursuant to Rule&nbsp;14a-12
  under the Exchange Act (17 CFR 240.14a-12)</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&#160; Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under
  the Exchange Act (17 CFR 240.14d-2(b))</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&#160; Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under
  the Exchange Act (17 CFR 240.13e-4(c))</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\Vmeane\08-15357-1\task2961075\15357-1-ba.htm',USER='vmeane',CD='May 27 14:56 2008' -->
  
  
  
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  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
  
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item
  8.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Other Events.</font></b></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On
  May&nbsp;27, 2008, Stephen R. Wilson, Chairman of the Board of Directors,
  President and Chief Executive Officer of CF Industries Holdings,&nbsp;Inc. (the
  &#147;<u>Company</u>&#148;), entered into a Rule&nbsp;10b5-1 trading plan (the &#147;<u>Plan</u>&#148;)
  with a broker to sell Company common stock to be acquired upon exercise of
  certain of Mr.&nbsp;Wilson&#146;s employee stock options. The Plan is in addition to
  the Rule&nbsp;10b5-1 trading plan previously disclosed on the Company&#146;s Current
  Report on Form&nbsp;8-K, filed with the U.S. Securities and Exchange Commission
  (the &#147;<u>SEC</u>&#148;) on November&nbsp;29, 2007 and the Rule&nbsp;10b5-1 trading
  plan previously disclosed on the Company&#146;s Current Report on Form&nbsp;8-K,
  filed with the SEC on February&nbsp;29, 2008.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant
  to the Plan, stock options with respect to a maximum of 200,000 shares of
  common stock may be exercised and the underlying common stock sold within a
  predetermined range of dates between August&nbsp;2008 and February&nbsp;2010,
  subject to certain predetermined criteria based on the market price of the
  Company&#146;s common stock, after which time the Plan will terminate. The Plan may
  be cancelled as provided in the Plan. Mr.&nbsp;Wilson entered into the Plan as
  part of his personal long-term investment strategy for asset diversification.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Any
  transactions under the Plan will be reported by Mr.&nbsp;Wilson through Rule&nbsp;144
  filings and individual Form&nbsp;4 filings with the SEC, as appropriate.</font></p>
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
  Plan is intended to comply with Rule&nbsp;10b5-1 of the Securities Exchange Act
  of 1934, as amended, and the Company&#146;s insider trading policy. Rule&nbsp;10b5-1
  allows corporate insiders to establish prearranged written stock trading plans
  at a time when the insider is not aware of material, nonpublic information.
  Subsequent receipt by the insider of material, nonpublic information will not
  prevent prearranged transactions under the Rule&nbsp;10b5-1 plan from being
  executed.</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\Vmeane\08-15357-1\task2962845\15357-1-bc.htm',USER='vmeane',CD='May 28 11:40 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div style="font-family:Times New Roman;">
  
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
  
  <p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be signed
  on its behalf by the undersigned hereunto duly authorized.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-indent:1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Date:
    </font></b><font size="2" style="font-size:10.0pt;">May&nbsp;28, 2008</font></p>
    </td>
    <td width="51%" colspan="4" valign="top" style="padding:0in .7pt 0in .7pt;width:51.92%;">
    <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CF
    INDUSTRIES HOLDINGS, INC.</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="14%" colspan="3" valign="top" style="padding:0in .7pt 0in .7pt;width:14.12%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="37%" valign="top" style="padding:0in .7pt 0in .7pt;width:37.8%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="14%" colspan="3" valign="top" style="padding:0in .7pt 0in .7pt;width:14.12%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="37%" valign="top" style="padding:0in .7pt 0in .7pt;width:37.8%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="14%" colspan="3" valign="top" style="padding:0in .7pt 0in .7pt;width:14.12%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="37%" valign="top" style="padding:0in .7pt 0in .7pt;width:37.8%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in .7pt 0in .7pt;width:6.06%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="45%" colspan="3" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:45.86%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
    Douglas C. Barnard</font></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in .7pt 0in .7pt;width:6.06%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in .7pt 0in .7pt;width:6.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
    </td>
    <td width="39%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:39.36%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Douglas C. Barnard</font></p>
    </td>
   </tr>
   <tr>
    <td width="48%" valign="top" style="padding:0in .7pt 0in .7pt;width:48.08%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in .7pt 0in .7pt;width:6.06%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="6%" valign="top" style="padding:0in .7pt 0in .7pt;width:6.5%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
    </td>
    <td width="39%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:39.36%;">
    <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice President, General Counsel, and Secretary</font></p>
    </td>
   </tr>
   <tr height="0">
    <td width="360" style="border:none;"></td>
    <td width="45" style="border:none;"></td>
    <td width="49" style="border:none;"></td>
    <td width="12" style="border:none;"></td>
    <td width="283" style="border:none;"></td>
   </tr>
  </table>
  
  <p style="margin:0in 0in .0001pt 3.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "a08-15357_18k.htm", "description": "8-K", "secsgml_size_bytes": 20794}]
metadata_filer: {"company-data": {"conformed-name": "CF Industries Holdings, Inc.", "cik": "0001324404", "assigned-sic": "2870", "irs-number": "202697511", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-32597", "film-number": "08863159"}, "business-address": {"street1": "4 PARKWAY NORTH", "street2": "SUITE 400", "city": "DEERFIELD", "state": "IL", "zip": "60015", "phone": "(847) 405-2400"}, "mail-address": {"street1": "4 PARKWAY NORTH", "street2": "SUITE 400", "city": "DEERFIELD", "state": "IL", "zip": "60015"}}
text: UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  WASHINGTON, D.C. 20549
  FORM 8-K
  CURRENT REPORT
  Pursuant to Section 13 OR 15(d) of The
  Securities Exchange Act of 1934
  Date of Report (Date of earliest event
  reported):
  May 27,
  2008
  CF Industries Holdings, Inc.
  (Exact name of Registrant as specified in its charter)
  Delaware
  (State or other jurisdiction
  of incorporation)
  001-32597
  (Commission File No.)
  20-2697511
  (I.R.S. Employer
  Identification Number)
  4 Parkway North, Suite 400
  Deerfield, IL
  (Address of principal
  executive offices)
  60015
  (Zip Code)
  Registrant's telephone number, including area
  code:
  (847)
  405-2400
  (Former name or former address if changed
  since last report)
  Check
  the appropriate box below if the Form 8-K filing is intended to
  simultaneously satisfy the filing obligation of the registrant under any of the
  following provisions (
  see
  General Instruction A.2. below):
  o
  Written communications pursuant to Rule 425
  under the Securities Act (17 CFR 230.425)
  o
  Soliciting material pursuant to Rule 14a-12
  under the Exchange Act (17 CFR 240.14a-12)
  o
  Pre-commencement communications pursuant to Rule 14d-2(b) under
  the Exchange Act (17 CFR 240.14d-2(b))
  o
  Pre-commencement communications pursuant to Rule 13e-4(c) under
  the Exchange Act (17 CFR 240.13e-4(c))
  Item
  8.01               Other Events.
  On
  May 27, 2008, Stephen R. Wilson, Chairman of the Board of Directors,
  President and Chief Executive Officer of CF Industries Holdings, Inc. (the
  "
  Company
  "), entered into a Rule 10b5-1 trading plan (the "
  Plan
  ")
  with a broker to sell Company common stock to be acquired upon exercise of
  certain of Mr. Wilson's employee stock options. The Plan is in addition to
  the Rule 10b5-1 trading plan previously disclosed on the Company's Current
  Report on Form 8-K, filed with the U.S. Securities and Exchange Commission
  (the "
  SEC
  ") on November 29, 2007 and the Rule 10b5-1 trading
  plan previously disclosed on the Company's Current Report on Form 8-K,
  filed with the SEC on February 29, 2008.
  Pursuant
  to the Plan, stock options with respect to a maximum of 200,000 shares of
  common stock may be exercised and the underlying common stock sold within a
  predetermined range of dates between August 2008 and February 2010,
  subject to certain predetermined criteria based on the market price of the
  Company's common stock, after which time the Plan will terminate. The Plan may
  be cancelled as provided in the Plan. Mr. Wilson entered into the Plan as
  part of his personal long-term investment strategy for asset diversification.
  Any
  transactions under the Plan will be reported by Mr. Wilson through Rule 144
  filings and individual Form 4 filings with the SEC, as appropriate.
  The
  Plan is intended to comply with Rule 10b5-1 of the Securities Exchange Act
  of 1934, as amended, and the Company's insider trading policy. Rule 10b5-1
  allows corporate insiders to establish prearranged written stock trading plans
  at a time when the insider is not aware of material, nonpublic information.
  Subsequent receipt by the insider of material, nonpublic information will not
  prevent prearranged transactions under the Rule 10b5-1 plan from being
  executed.
  2
  SIGNATURES
  Pursuant to the requirements of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be signed
  on its behalf by the undersigned hereunto duly authorized.
  Date:
  May 28, 2008
  CF
    INDUSTRIES HOLDINGS, INC.
  By:
  /s/
    Douglas C. Barnard
  Name:
  Douglas C. Barnard
  Title:
  Vice President, General Counsel, and Secretary
  3