Sec Form 4 Filing - Oaktree Holdings, Ltd. @ Montrose Environmental Group, Inc. - 2020-11-30

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Oaktree Holdings, Ltd. 2. Issuer Name and Ticker or Trading Symbol Montrose Environmental Group, Inc. [ MEG] 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) 333 SOUTH GRAND AVENUE, 28TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 11/30/2020 (Street) LOS ANGELES, CA90071 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 11/30/2020 S 4,322,644 ( 1 ) ( 2 ) ( 3 ) D $ 27.18 0 I See Footnote ( 4 ) ( 5 )

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 Director 10% Owner Officer Other Oaktree Holdings, Ltd. 333 SOUTH GRAND AVENUE 28TH FLOOR LOS ANGELES, CA90071 X OAKTREE CAPITAL MANAGEMENT LP 333 SOUTH GRAND AVENUE 28TH FLOOR LOS ANGELES, CA90071 X OCM FIE, LLC 333 SOUTH GRAND AVENUE 28TH FLOOR LOS ANGELES, CA90071 X Signatures See Signatures Included in Exhibit 99.1 12/02/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Consists of 1,666 shares of Montrose Environmental Group, Inc.?s (the ?Company?) directly beneficially owned by OCM FIE, LLC (?OCM FIE?) ( 2 )Consists of 2,320,979 shares of the Company directly beneficially owned by OCM Montrose Holdings, L.P. (?OCM Montrose?) ( 3 )Consists of 1,999,999 shares of the Company directly beneficially owned by OCM Montrose II Holdings, L.P. (?OCM Montrose II?) ( 4 )This Form 4 is being filed jointly by (each, a ?Reporting Person? and, collectively, the ?Reporting Persons?) (i) OCM Montrose, (ii) OCM Montrose II, (iii) Oaktree Fund GP, LLC (?Fund GP?), in its capacity as the general partner of OCM Montrose and OCM Montrose II, (iv) Oaktree Fund GP I, L.P. (?Fund GP I?), in its capacity as the managing member of Fund GP, (v) Oaktree Capital I, L.P. (?Capital I?), in its capacity as the general partner of Fund GP I, (vi) OCM Holdings I, LLC (?Holdings I?), in its capacity as general partner of Capital I, (vii) Oaktree Holdings, LLC (?Holdings LLC?), in its capacity as the managing member of Holdings I, (viii) OCM FIE, (ix) Oaktree Capital Management, L.P. (?OCM L.P.?), in its capacity as the managing member of OCM FIE, (x) Oaktree Holdings, Ltd. (?Holdings Ltd.?), (cont?d in FN 5) ( 5 )(cont?d from FN 4) in its capacity as the general partner of OCM L.P., (xi) Oaktree Capital Group, LLC (?OCG?), in its capacity as the managing member of Holdings LLC and sole director of Holdings Ltd., (xii) Brookfield Asset Management Inc. (?BAM?), in its capacity as the indirect owner of the class A units of OCG and (xiii) Partners Limited, in its capacity as the sole owner of Class B Limited Voting Shares of BAM. Each of the Reporting Persons expressly disclaims beneficial ownership of the equity securities reported herein, except to the extent of their respective pecuniary interests therein, and the filing of this Form 4 shall not be construed as an admission that any such Reporting Person is the beneficial owner of any equity securities covered by this Form 4.

Remarks: This is part 2 of a 2 part filing.

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.