Sec Form 4 Filing - MITSUI & CO LTD @ BOINGO WIRELESS INC - 2012-02-17

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person MITSUI & CO LTD 2. Issuer Name and Ticker or Trading Symbol BOINGO WIRELESS INC [ WIFI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2-1, OHTEMACHI 1-CHOME, CHIYODA-KU 3. Date of Earliest Transaction (MM/DD/YY) 02/17/2012 (Street) TOKYO, M0100-0004 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/17/2012 S 456 D $ 9.74 77,460 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 520 D $ 9.73 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 713 D $ 9.72 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 1,248 D $ 9.71 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.705 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 538 D $ 9.7 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 938 D $ 9.69 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.6875 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 740 D $ 9.68 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.6775 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 861 D $ 9.67 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.665 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 1,013 D $ 9.66 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 1,105 D $ 9.65 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.6425 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 786 D $ 9.64 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.635 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 310 D $ 9.63 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 318 D $ 9.62 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 796 D $ 9.61 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnot es ( 1 ) ( 3 ) Common Stock 02/17/2012 S 499 D $ 9.6 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 1,000 D $ 9.59 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.585 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 628 D $ 9.58 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 305 D $ 9.57 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 258 D $ 9.56 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 100 D $ 9.55 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 200 D $ 9.52 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 900 D $ 9.5 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 ) Common Stock 02/17/2012 S 647 D $ 9.49 77,640 ( 1 ) ( 2 ) ( 3 ) I See Footnotes ( 1 ) ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Dir ector 10% Owner Officer Other MITSUI & CO LTD 2-1, OHTEMACHI 1-CHOME CHIYODA-KU TOKYO, M0100-0004 X MITSUI & CO USA INC 200 PARK AVE NEW YORK, NY10166 X MCVP Holding, Inc. 200 PARK AVE NEW YORK, NY10166 X Corporate Development Fund of Mitsui & Co., Ltd. NIHON KEIZAI SHIMBUN, THB8TH FLOOR 1-3-7 OTEMACHICHIYODA-KU TOKYO, M0100-0004 X Mitsui & Co. Global Investment, Inc. 535 MIDDLEFIELD ROAD MENLO PARK, CA94025 X Mitsui & Co. Global Investment Ltd. NIHON KEIZAI SHIMBUN, THB8TH FLOOR 1-3-7 OTEMACHICHIYODA-KU TOKYO, M0100-0004 X Mitsui & Co. Principal Investments Ltd. NIHON KEIZAI SHIMBUN, THB8TH FLOOR 1-3-7 OTEMACHICHIYODA-KU TOKYO, M0100-0004 X Signatures /s/ Adam Walczak as Attorney-in-fact for Mitsui & Co. Ltd. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for Mitsui & Co. (U.S.A.), Inc. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for MCVP Holding, Inc. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for Corporate Development Fund of Mitsui & Co., Ltd. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for Mitsui & Co. Global Investment, Inc. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for Mitsui & Co. Global Investment Ltd. 02/21/2012 Signature of Reporting Person Date /s/ Adam Walczak as Attorney-in-fact for Mitsui & Co. Principal Investments Ltd. 02/21/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On February 17, 2012, an aggregate of 29,429 shares of Boingo Wireless, Inc. (WIFI) common stock was sold by Mitsui & Co Global Investment, Inc. and MCVP Holding, Inc. at an average price of $9.4142 per share. The proceeds of the sales of shares were allocated between the accounts of Mitsui & Co. Global Investment, Inc. and MCVP Holding, Inc. on a pro rata basis. On this basis, Mitsui & Co. Global Investment, Inc. sold 2,557 shares (8.69%) and MCVP Holding, Inc. sold 26,872 shares (91.31%). Mitsui & Co. Global Investment, Inc. is a wholly owned subsidiary of Mitsui & Co. Global Investment Ltd., which is a wholly owned subsidiary of Mitsui & Co. Ltd. Accordingly, Mitsui & Co. Global Investment Ltd. and Mitsui & Co. Ltd. may be deemed to be the beneficial owner of the shares of Common Stock owned by Mitsui & Co. Global Investment, Inc. MCVP Holding, Inc. is a wholly owned subsidiary of Mitsui & Co. Ltd. Accordingly, Mitsui & Co. Ltd. may be deemed to be the beneficial owner of the shares of Common Stock owned by MCVP Holding, Inc. ( 2 )The number of shares of Boingo Wireless, Inc. (WIFI) common stock reported in thiscolumn is the aggregate number of shares owned by Mitsui & Co. Global Investment Inc. and MCVP Holding, Inc. following the transactions on February 17, 2012. Following such transactions, Mitsui & Co. Global Investment Inc. owned 6,732 shares and MCVP Holding, Inc. owned 70,728 shares of Boingo Wireless, Inc. (WIFI). ( 3 )Mitsui & Co. Ltd. is the direct 100% owner of Mitsui & Co. (U.S.A.), Inc., who directly owns 3,348,076 shares of Common Stock. Corporate Development Fund of Mitsui & Co. Ltd., who directly owns 2,520,998 shares of Common Stock, is 99% directly owned by Mitsui & Co. Ltd. and 1% directly owned by Mitsui & Co. Principal Investments Ltd., who has managing authority over Corporate Development Fund of Mitsui & Co. Ltd. Accordingly, Mitsui & Co. Principal Investments Ltd., Mitsui & Co. Global Investment Ltd. and Mitsui & Co. Ltd. may be deemed to be the beneficial owners of the shares of Common Stock held by Mitsui & Co. (U.S.A.), Inc., MCVP Holding, Inc., Corporate Development Fund of Mitsui & Co. Ltd and Mitsui & Co. Global Investment, Inc., 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 & Co. (U.S.A.), Inc., MCVP Holding, Inc., Corporate Development Fund of Mitsui & Co. Ltd and Mitsui & 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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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