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                    <footnoteId id="F5"/>
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                <natureOfOwnership>
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    <footnotes>
        <footnote id="F1">The prices reported in Column 4 are weighted average prices.  The shares were sold in multiple transactions at prices ranging from $9.40 to $9.70, inclusive.  The reporting person undertakes to provide to Boingo Wireless, Inc., any security holder of Boingo Wireless, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.</footnote>
        <footnote id="F2">The prices reported in Column 4 are weighted average prices.  The shares were sold in multiple transactions at prices ranging from $9.17 to $9.445, inclusive.  The reporting person undertakes to provide to Boingo Wireless, Inc., any security holder of Boingo Wireless, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.</footnote>
        <footnote id="F3">The reported securities are owned directly by Mitsui &amp; Co. Global Investment, Inc., which is a wholly owned subsidiary of Mitsui &amp; Co. Global Investment Ltd., which is a wholly owned subsidiary of Mitsui &amp; Co., Ltd.  Accordingly, Mitsui &amp; Co. Global Investment Ltd. and Mitsui &amp; Co., Ltd. may be deemed to be the beneficial owner of the shares of common stock of Boingo Wireless, Inc (&quot;Common Stock&quot;) owned by Mitsui &amp; Co. Global Investment, Inc.</footnote>
        <footnote id="F4">The reported securities are owned directly by MCVP Holding, Inc., which is a wholly owned subsidiary of Mitsui &amp; Co., Ltd.  Accordingly, Mitsui &amp; Co., Ltd. may be deemed to be the beneficial owner of the shares of Common Stock owned by MCVP Holding, Inc.</footnote>
        <footnote id="F5">Mitsui &amp; Co., Ltd. is the direct 100% owner of Mitsui &amp; Co. (U.S.A.), Inc., who directly owns 3,348,076 shares of Common Stock.  Corporate Development Fund of Mitsui &amp; Co., Ltd., who directly owns 2,520,998 shares of Common Stock, is 99% directly owned by Mitsui &amp; Co., Ltd. and 1% directly owned by Mitsui &amp; Co. Principal Investments Ltd., who has managing authority over Corporate Development Fund of Mitsui &amp; Co., Ltd. Accordingly, Mitsui &amp; Co. Principal Investments Ltd., Mitsui &amp; Co. Global Investment Ltd. and Mitsui &amp; Co., Ltd. may be deemed to be the beneficial owners of the shares of Common Stock held by Mitsui &amp; Co. (U.S.A.), Inc., MCVP Holding, Inc., Corporate Development Fund of Mitsui &amp; Co., Ltd and Mitsui &amp; Co. Global Investment, Inc., ( Continued to footnote 6)</footnote>
        <footnote id="F6">(continued from footnote 5 ) but each disclaims beneficial ownership of such securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities, except to the extent of its pecuniary interests therein.  Mitsui &amp; Co. (U.S.A.), Inc., MCVP Holding, Inc., Corporate Development Fund Mitsui &amp; Co., Ltd and Mitsui &amp; Co. Global Investment, Inc. may be deemed to beneficially own the securities held by each other but disclaim beneficial ownership of such securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities, except to the extent of their pecuniary interests therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Mitsui &amp; Co., Ltd.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Mitsui &amp; Co. (U.S.A.), Inc.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for MCVP Holding, Inc.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Corporate Development Fund of Mitsui &amp; Co., Ltd.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Mitsui &amp; Co. Global Investment, Inc.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Mitsui &amp; Co. Global Investment Ltd.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Adam Walczak as Attorney-in-fact for Mitsui &amp; Co. Principal Investments Ltd.</signatureName>
        <signatureDate>2012-02-23</signatureDate>
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