Sec Form 4 Filing - Hazard Charles M Jr @ MongoDB, Inc. - 2017-10-23

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 Hazard Charles M Jr 2. Issuer Name and Ticker or Trading Symbol MongoDB, Inc. [ MDB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O FLYBRIDGE CAPITAL PARTNERS, 31 ST. JAMES AVENUE, 6TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/23/2017 (Street) BOSTON, MA02116 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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

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 Series B Preferred Stock ( 1 ) 10/23/2017 C 5,089,898 ( 1 ) ( 1 ) Class B Common Stock 3,817,422 ( 2 ) ( 1 ) 0 I By Limited Partnership ( 3 ) Series C Preferred Stock ( 1 ) 10/23/2017 C 612,606 ( 1 ) ( 1 ) Class B Common Stock 459,454 ( 4 ) ( 1 ) 0 I By Limited Partnership ( 3 ) Series D Preferred Stock ( 1 ) 10/23/2017 C 605,190 ( 1 ) ( 1 ) Class B Common Stock 453,892 ( 5 ) ( 1 ) 0 I By Limited Partnership ( 3 ) Series E Preferred Stock ( 1 ) 10/23/2017 C 4,762 ( 1 ) ( 1 ) Class B Common Stock 3,572 ( 6 ) ( 1 ) 0 I By Limited Partnership ( 3 ) Class B Common Stock ( 7 ) 10/23/2017 C 4,734,340 ( 7 ) ( 7 ) Class A Common Stock 4,734,340 ( 8 ) ( 7 ) 4,734,340 ( 8 ) I By Limited Partnership ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hazard Charles M Jr C/O FLYBRIDGE CAPITAL PARTNERS 31 ST. JAMES AVENUE, 6TH FLOOR BOSTON, MA02116 X X Signatures /s/Alison Haggerty, Attorney-in-Fact 10/24/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of Series B Preferred Stock, Series C Preferred Stock, Series D Preferred Stock and Series E Preferred Stock automatically converted into approximately 0.75 shares of Class B Common Stock immediately prior to the closing of the Issuer's initial public offering and had no expiration date. ( 2 )3,808,261 of these shares are owned by Flybridge Capital Partners III, L.P. ("Flybridge Capital") and 9,161 of these shares are owned by Flybridge Network Fund III, L.P. ("Flybridge Network"). ( 3 )The Reporting Person is one of three managing members of Flybridge Capital Partners GP III, LLC, the General Partner of each of Flybridge Capital and Flybridge Network and, as such, shares voting and dispositive power over the shares held by each of Flybridge Capital and Flybridge Network. The Reporting Person disclaims beneficical ownership of the shares owned by each of Flybridge Capital and Flybridge Network except to the extent of his pecuniary interest therein and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. ( 4 )458,570 of these shares are owned by Flybridge Capital and 884 of these shares are owned by Flybridge Network. ( 5 )452,986 of these shares are owned by Flybridge Capital and 906 of these shares are owned by Flybridge Network. ( 6 )3,563 of these shares are owned by Flybridge Capital and 9 of these shares are owned by Flybridge Network. ( 7 )Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. The Class B Common Stock will convert automatically into Class A Common Stock on the same basis upon the earlier of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's restated certificate of incorporation, and (ii) at such time as the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of the Issuer's capital stock outstanding. ( 8 )4,723,379 of these shares are owned by Flybridge Capital and 10,961 of these shares are owned by Flybridge Network.

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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