SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 4)*

Bonanza Creek Energy, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

097793400

(CUSIP Number)

Ward Dietrich

645 Madison Avenue, 14th Floor, New York, New York 10022

Telephone: (646) 589-7005

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

August 17, 2018

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the following box. ☐

(Page 1 of 7 Pages)

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See Rule 13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 097703400 SCHEDULE 13D Page 2 of 7 Pages

1	NAMES OF REPORTING PERSONS
	The Mangrove Partners Master Fund, Ltd.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☒
				(b)	☐
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			0
		8	SHARED VOTING POWER
			1,620,041
		9	SOLE DISPOSITIVE POWER
			0
		10	SHARED DISPOSITIVE POWER
			1,620,041
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,620,041
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	7.9%
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	OO

CUSIP No. 097703400 SCHEDULE 13D Page 3 of 7 Pages

1	NAMES OF REPORTING PERSONS
	Mangrove Partners
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☒
				(b)	☐
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			0
		8	SHARED VOTING POWER
			1,620,041
		9	SOLE DISPOSITIVE POWER
			0
		10	SHARED DISPOSITIVE POWER
			1,620,041
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,620,041
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	7.9%
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	OO

CUSIP No. 097703400 SCHEDULE 13D Page 4 of 7 Pages

1	NAMES OF REPORTING PERSONS
	Nathaniel August
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☒
				(b)	☐
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			0
		8	SHARED VOTING POWER
			1,620,041
		9	SOLE DISPOSITIVE POWER
			0
		10	SHARED DISPOSITIVE POWER
			1,620,041
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,620,041
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	7.9%
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	IN

CUSIP No. 097703400 SCHEDULE 13D Page 5 of 7 Pages

This Amendment No. 4 to Schedule 13D (“Amendment No. 4”) is being filed by the undersigned, pursuant to §240.13d-2(a), with respect to the Common Stock, par value $0.001 per share (the “Shares”), of Bonanza Creek Energy, Inc., a company incorporated in Delaware (“the Issuer”), whose principal executive offices are located at 410 17th Street, Suite 1400 Denver, Colorado 80202.  This Amendment No. 4 amends and supplements the Schedule 13D filed by the Reporting Persons with the Securities and Exchange Commission (the “SEC”) on July 19, 2017 (the “Original Schedule 13D”), as amended by Amendment No. 1, filed with the SEC on November 29, 2017, Amendment No. 2, filed with the SEC on May 17, 2018, and Amendment No. 3, filed with the SEC on August 14, 2018 (collectively, the “Schedule 13D”).

Except as specifically provided herein, this Amendment No. 4 does not modify any of the information previously reported in the Schedule 13D.  Capitalized terms used but not defined in this Amendment No. 4 shall have the meanings given them in the Schedule 13D.

Item 3.	SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
	Item 3 of the Schedule 13D is hereby amended by adding the following:
	A total of approximately $50,365,290, inclusive of commissions, was paid to acquire the securities reported as beneficially owned by the Master Fund.  The funds used to purchase these securities were obtained from the general working capital of the Master Fund, including margin account borrowings made in the ordinary course of business, although the Reporting Persons cannot determine whether any funds allocated to purchase such securities were obtained from any margin account borrowings.

Item 5.	INTEREST IN SECURITIES OF THE ISSUER
	Item 5(a), (b) and (c) of the Schedule 13D is hereby amended and supplemented as follows:
(a)	The aggregate percentage of Shares reported owned by each person named herein is based upon 20,541,070 Shares outstanding, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report filed on Form 10-Q with the SEC on August 9, 2018. As of August 17, 2018, the Master Fund may be deemed to beneficially own 1,620,041 Shares (approximately 7.9% of the total number of Shares outstanding). By virtue of their respective relationships with the Master Fund as discussed in further detail in Item 2 to Amendment No. 2, Mangrove Partners and Mr. August may be deemed to indirectly beneficially own the Shares owned directly by the Master Fund. Each Reporting Person, as a member of a “group” with the other Reporting Persons for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, may be deemed the beneficial owner of the Shares directly owned by the other Reporting Persons. Each Reporting Person disclaims beneficial ownership of such Shares except to the extent of his or its pecuniary interest therein.

CUSIP No. 097703400 SCHEDULE 13D Page 6 of 7 Pages

	As described further in Item 6 of Amendment No. 2 and Amendment No. 3, in addition to the Shares beneficially owned, as reported herein, the Reporting Persons have economic exposure to, but do not have voting or investment power over, or the right to acquire such power over, an additional 802,670 notional Shares referenced in the Swaps.  Each Reporting Person disclaims beneficial ownership of the Shares referenced in the Swaps.
(b)	Each of the Master Fund, Mangrove Partners and Mr. August has shared voting and dispositive power over the 1,620,041 Shares owned directly by the Master Fund.
(c)	Since the Reporting Persons’ most recent Schedule 13D on Amendment No. 3, the following transactions were effected by the Reporting Persons in the Shares.  All of these transactions were effected in the open-market through a broker.

Trade Date	Reporting Person	Transaction	Quantity	Price per Share (in USD)
August 14, 2018	Master Fund	Purchase Shares	5,600	$31.7715
August 14, 2018	Master Fund	Purchase Shares	77,157	$31.8562
August 15, 2018	Master Fund	Purchase Shares	84,911	$31.7080
August 16, 2018	Master Fund	Purchase Shares	5,224	$31.4609
August 16, 2018	Master Fund	Purchase Shares	21,961	$31.4757
August 17, 2018	Master Fund	Purchase Shares	15,466	$31.6470

CUSIP No. 097703400 SCHEDULE 13D Page 7 of 7 Pages

SIGNATURES

After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Date: August 20, 2018

THE MANGROVE PARTNERS MASTER FUND, LTD.
By:	MANGROVE PARTNERS, as Investment Manager
By:	/s/ Nathaniel August
	Name: Nathaniel August
	Title:   Director

MANGROVE PARTNERS
By:	/s/ Nathaniel August
	Name: Nathaniel August
	Title:   Director
/s/ Nathaniel August
Nathaniel August