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<STREET1>C/O GREENHILL & CO.
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center" align="left">UNITED STATES</div>
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Park Avenue, 23rd Floor, New York, NY 10022</font></div>
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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):</font></div>
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OF CONTENTS</font></div>
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Information and Where to Find It</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Participants
in the Solicitation</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
7.01&#160;&#160;Regulation FD Disclosure</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
8.01&#160;&#160;Other Events</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">INFORMATION
TO BE INCLUDED IN THIS REPORT</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">ADDITIONAL
INFORMATION AND WHERE TO FIND IT</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">THIS
CURRENT REPORT ON FORM 8-K IS BEING MADE WITH RESPECT TO THE PROPOSED
ACQUISITION (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold">ACQUISITION</font>&#8221;) BY GHL
ACQUISITION CORP. (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold">GHQ</font>&#8221;) OF IRIDIUM HOLDINGS LLC
AND RELATED TRANSACTIONS.&#160;&#160;IN CONNECTION WITH THE ACQUISITION, GHQ
FILED WITH THE SECURITIES EXCHANGE COMMISSION (&#8220;<font style="DISPLAY: inline; FONT-WEIGHT: bold">SEC</font>&#8221;) A PRELIMINARY PROXY
STATEMENT AND INTENDS TO MAIL A DEFINITIVE PROXY STATEMENT AND OTHER RELEVANT
DOCUMENTS TO GHQ&#8217;S STOCKHOLDERS.&#160;&#160;THE INFORMATION CONTAINED IN THIS
COMMUNICATION IS NOT COMPLETE AND MAY BE CHANGED.&#160;&#160;BEFORE MAKING ANY
VOTING OR INVESTMENT DECISIONS, GHQ&#8217;S STOCKHOLDERS AND OTHER INTERESTED PERSONS
ARE URGED TO READ GHQ&#8217;S PRELIMINARY PROXY STATEMENT, AND WHEN IT BECOMES
AVAILABLE, ANY AMENDMENTS THERETO, AND THE DEFINITIVE PROXY STATEMENT IN
CONNECTION WITH GHQ&#8217;S SOLICITATION OF PROXIES FOR THE SPECIAL MEETING TO BE HELD
TO APPROVE THE ACQUISITION AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC
BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT IRIDIUM HOLDINGS, GHQ AND
THE PROPOSED ACQUISITION.&#160;&#160;THE DEFINITIVE PROXY STATEMENT WILL BE
MAILED TO GHQ STOCKHOLDERS AS OF A RECORD DATE TO BE ESTABLISHED FOR VOTING ON
THE PROPOSED ACQUISITION.&#160;&#160;STOCKHOLDERS AND OTHER INTERESTED PERSONS
WILL ALSO BE ABLE TO OBTAIN A COPY OF THE PRELIMINARY PROXY STATEMENT AND
DEFINITIVE PROXY STATEMENT, ONCE IT IS AVAILABLE, WITHOUT CHARGE, AT THE SEC&#8217;S
WEB SITE AT HTTP://WWW.SEC.GOV OR BY DIRECTING A REQUEST TO:&#160;&#160;GHL
ACQUISITION CORP., 300 PARK AVENUE, 23RD FLOOR, NEW YORK, NEW YORK, TELEPHONE:
(212) 389-1500.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">PARTICIPANTS
IN THE SOLICITATION</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">GHQ AND
ITS DIRECTORS AND OFFICERS MAY BE DEEMED TO BE PARTICIPANTS IN THE SOLICITATION
OF PROXIES TO GHQ&#8217;S STOCKHOLDERS IN CONNECTION WITH THE
ACQUISITION.&#160;&#160;A LIST OF THE NAMES OF THOSE DIRECTORS AND OFFICERS AND
A DESCRIPTION OF THEIR INTERESTS IN GHQ IS CONTAINED IN GHQ&#8217;S REPORT ON FORM
10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2008, AND GHQ&#8217;S PRELIMINARY PROXY
STATEMENT WHICH ARE FILED WITH THE SEC.&#160;&#160;GHQ&#8217;S STOCKHOLDERS MAY OBTAIN
ADDITIONAL INFORMATION ABOUT THE DIRECT AND INDIRECT INTERESTS OF THE
PARTICIPANTS IN THE ACQUISITION, BY SECURITY HOLDINGS OR OTHERWISE, BY READING
GHQ&#8217;S PROXY STATEMENT AND OTHER MATERIALS FILED OR TO BE FILED WITH THE SEC WHEN
SUCH INFORMATION BECOMES AVAILABLE.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">NOTHING
IN THIS COMMUNICATION SHOULD BE CONSTRUED AS, OR IS INTENDED TO BE, A
SOLICITATION FOR OR AN OFFER TO PROVIDE INVESTMENT ADVISORY
SERVICES.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
7.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Regulation FD
Disclosure</font></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">GHL
Acquisition Corp. (&#8220;GHQ&#8221;) intends to offer shares of its common stock, par value
$0.001 per share.&#160; The offering will be made pursuant to GHQ's shelf
registration statement filed with the Securities&#160;and Exchange Commission
and the&#160;closing of the offering will be conditioned upon the closing of
GHQ's proposed acquisition of Iridium Holdings LLC, which is in turn subject to
shareholder approval, Federal Communications Commission approval and other
customary closing conditions.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 27pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">GHQ
intends to use the net proceeds of the offering to repurchase certain of its
outstanding shares of common stock, in connection with the exchange of certain
of its outstanding warrants for cash and shares of its common stock and for
general corporate purposes. </font></div>
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registration statement relating to these securities has been filed with the SEC
but has not yet become effective. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective.</font></div>
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the base prospectus and, once it is available, the prospectus supplement can be
obtained without charge at the SEC&#8217;s web site at http://www.sec.gov or by
directing a request to: GHL Acquisition Corp., 300 Park Avenue, 23rd floor, New
York, New York, telephone: (212) 389-1500.</font></div>
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8.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Other
Events</font></font></div>
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information in this report is being furnished and shall not be deemed to be
filed for purposes of Section 18 of the Securities and Exchange Act of 1934, as
amended (the &#8220;Exchange Act&#8221;), or otherwise be subject to the liabilities of that
section, nor shall it be deemed to be incorporated by reference in any filing
under the Securities Act of 1933, as amended, or the Exchange Act.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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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></div>
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            <td valign="top" width="4%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="bottom" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="bottom" width="16%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
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      ACQUISITION CORP.</font></div>
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            <td valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="bottom" width="16%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;</font></td>
            <td valign="bottom" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;</font></td>
            <td align="left" colspan="2" valign="top" width="45%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
            <td align="left" valign="top" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
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            <td valign="top" width="4%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="bottom" width="5%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="bottom" width="16%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="bottom" width="10%" style="PADDING-BOTTOM: 2px"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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              <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
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          <tr>
            <td valign="top" width="4%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="16%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
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      L. Bok</font></div>
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            <td valign="top" width="4%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
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            <td valign="top" width="16%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
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            <td valign="top" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="42%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;
    </font></td>
            <td valign="top" width="10%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: arial">&#160;</font></td>
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July 23, 2009</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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