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 OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Horowitz Eliot 2. Issuer Name and Ticker or Trading Symbol MongoDB, Inc. [ MDB ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Technology Officer
(Last)         (First)         (Middle)
C/O MONGODB, INC., 1633 BROADWAY, 38TH FLOOR
3. Date of Earliest Transaction (MM/DD/YYYY)
6/15/2020
(Street)
NEW YORK, NY 10019
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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
Class A Common Stock  6/11/2020    J(1)   V 1229663  A $0 (1) 1335285  D   
Class A Common Stock  6/15/2020    S(2)    5600  D $189.38 (3) 1329685  D   
Class A Common Stock  6/15/2020    S(2)    1147  D $190.18 (4) 1328538  D   
Class A Common Stock  6/15/2020    S(2)    2153  D $191.31 (5) 1326385  D   
Class A Common Stock  6/15/2020    S(2)    1900  D $192.30 (6) 1324485  D   
Class A Common Stock  6/15/2020    S(2)    7600  D $193.28 (7) 1316885  D   
Class A Common Stock  6/15/2020    S(2)    600  D $194.03 (8) 1316285  D   
Class A Common Stock  6/11/2020    J(1)   V 302500  A $0 (1) 302500  I  By Trust (9)
Class A Common Stock  6/15/2020    S(2)    3122  D $189.29 (10) 299378  I  By Trust (9)
Class A Common Stock  6/15/2020    S(2)    718  D $190.67 (11) 298660  I  By Trust (9)
Class A Common Stock  6/15/2020    S(2)    3360  D $191.40 (12) 295300  I  By Trust (9)
Class A Common Stock  6/15/2020    S(2)    300  D $192.21 (13) 295000  I  By Trust (9)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Class B Common Stock   (1) 6/11/2020    J (1)   V    1229663    (1)  (1) Class A Common Stock  1229663.0   (1) 0  D   
Class B Common Stock   (1) 6/11/2020    J (1)   V    302500    (1)  (1) Class A Common Stock  302500.0   (1) 0  I  By Trust (9)
Employee Stock Option (Right to Buy)  $5.72  6/11/2020    J (14)   V    225000    (15) 3/7/2023  Class B Common Stock  225000.0  $0  0  D   
Employee Stock Option (Right to Buy)  $5.72  6/11/2020    J (14)   V 225000       (15) 3/7/2023  Class A Common Stock  225000.0  $0  225000  D   
Employee Stock Option (Right to Buy)  $6.5  6/11/2020    J (14)   V    100000    (15) 4/22/2025  Class B Common Stock  100000.0  $0  0  D   
Employee Stock Option (Right to Buy)  $6.5  6/11/2020    J (14)   V 100000       (15) 4/22/2025  Class A Common Stock  100000.0  $0  100000  D   
Employee Stock Option (Right to Buy)  $6.5  6/11/2020    J (14)   V    200000    (16) 4/13/2026  Class B Common Stock  200000.0  $0  0  D   
Employee Stock Option (Right to Buy)  $6.5  6/11/2020    J (14)   V 200000       (16) 4/13/2026  Class A Common Stock  200000.0  $0  200000  D   

Explanation of Responses:
(1)  This does not represent an acquisition or disposition. It represents the automatic conversion on June 11, 2020 of each share of the Issuer's Class B Common Stock into one share the Issuer's Class A Common Stock, which occurred when the outstanding Class B Common Stock represented less than 10% of the aggregate number of shares of the Issuer's then outstanding Class A Common Stock and Class B Common Stock, as set forth in the Issuer's amended and restated certificate of incorporation.
(2)  The transactions were pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
(3)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $188.70 to $189.67, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(4)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $189.71 to $190.70, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(5)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $190.77 to $191.70, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(6)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $191.80 to $192.67, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(7)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $192.95 to $193.75, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(8)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $193.98 to $194.04, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(9)  These shares are held by The ERH Family 2012 Trust for the benefit of the reporting person's children. The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
(10)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $188.70 to $189.53, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(11)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $189.97 to $190.93, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(12)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $191.01 to $191.86, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(13)  The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $192.19 to $192.24, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
(14)  In connection with the automatic conversion described in footnote (1), outstanding options exercisable for Class B Common Stock that were issued under the Issuer's equity incentive plans remain unchanged, except that the underlying shares are now Class A Common Stock.
(15)  Immediately exercisable and fully vested.
(16)  All shares underlying this option are immediately exercisable, subject to a repurchase right in the Issuer's favor which lapses in accordance with the option's vesting schedule. 158,320 shares are vested. The remaining 41,680 shares shall vest in 10 equal monthly installments beginning on July 13, 2020, subject to the Reporting Person providing continuous service to the Issuer on each such date.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Horowitz Eliot
C/O MONGODB, INC.
1633 BROADWAY, 38TH FLOOR
NEW YORK, NY 10019
X
Chief Technology Officer

Signatures
/s/ Sophie Hubscher, Attorney-in-Fact 6/17/2020
**Signature of Reporting Person Date
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