UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D. C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

SP PLUS CORPORATION

(Name of Issuer)

Common Stock, par value $.001

(Title of Class of Securities)

78469C103

(CUSIP Number of Class of Securities)

David J. Snyderman

Magnetar Capital LLC

1603 Orrington Ave.

Evanston, Illinois 60201

(847) 905-4400

(Name, Address and Telephone Number of Person Authorized
to Receive Notices and Communications)

May 17, 2024

(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), 13d-1(f) or 13d-1(g), check the following box. ¨

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 240.13d-7(b) 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. 78469C103

SCHEDULE 13D

Page 2 of 10   

1.	NAME OF REPORTING PERSON: Magnetar Financial LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a)	¨
		(b)	x
3.	SEC USE ONLY
4.	SOURCE OF FUNDS OO
5.	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)		¨
6.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

NUMBER OF

BENEFICIALLY

OWNED BY

EACH REPORTING

PERSON

WITH

SOLE VOTING POWER

SHARED VOTING POWER

SOLE DISPOSITIVE POWER

10.

SHARED DISPOSITIVE POWER

11.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
12.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES           ¨
13.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0%
14.	TYPE OF REPORTING PERSON IA; OO

  CUSIP No. 78469C103

SCHEDULE 13D

Page 3 of 10   

1.	NAME OF REPORTING PERSON: Magnetar Capital Partners LP
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a)	¨
		(b)	x
3.	SEC USE ONLY
4.	SOURCE OF FUNDS OO
5.	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)		¨
6.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

NUMBER OF

BENEFICIALLY

OWNED BY

EACH REPORTING

PERSON

WITH

SOLE VOTING POWER

SHARED VOTING POWER

SOLE DISPOSITIVE POWER

10.

SHARED DISPOSITIVE POWER

11.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
12.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES           ¨
13.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0%
14.	TYPE OF REPORTING PERSON HC; OO

  CUSIP No. 78469C103

SCHEDULE 13D

Page 4 of 10   

1.	NAME OF REPORTING PERSON: Supernova Management LLC
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a)	¨
		(b)	x
3.	SEC USE ONLY
4.	SOURCE OF FUNDS OO
5.	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)		¨
6.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

NUMBER OF

BENEFICIALLY

OWNED BY

EACH REPORTING

PERSON

WITH

SOLE VOTING POWER

SHARED VOTING POWER

SOLE DISPOSITIVE POWER

10.

SHARED DISPOSITIVE POWER

11.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
12.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES           ¨
13.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0%
14.	TYPE OF REPORTING PERSON HC; OO

  CUSIP No. 78469C103

SCHEDULE 13D

Page 5 of 10   

1.	NAME OF REPORTING PERSON: David J. Snyderman
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a)	¨
		(b)	x
3.	SEC USE ONLY
4.	SOURCE OF FUNDS OO
5.	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)		¨
6.	CITIZENSHIP OR PLACE OF ORGANIZATION United States of America

NUMBER OF

BENEFICIALLY

OWNED BY

EACH REPORTING

PERSON

WITH

SOLE VOTING POWER

SHARED VOTING POWER

SOLE DISPOSITIVE POWER

10.

SHARED DISPOSITIVE POWER

11.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0
12.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES           ¨
13.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0%
14.	TYPE OF REPORTING PERSON HC; IN

SCHEDULE 13D

This Amendment No. 1 (“Amendment No. 1”) relates to the Statement of Beneficial Ownership on Schedule 13D filed jointly by Magnetar Financial LLC, a Delaware limited liability company (“Magnetar Financial”), Magnetar Capital Partners LP, a Delaware limited partnership (“Magnetar Capital Partners”), Supernova Management LLC, a Delaware limited liability company (“Supernova Management”), and David J. Snyderman (“Mr. Snyderman”) with the SEC on November 24, 2023, (as amended by this Amendment No. 1, the “Schedule 13D”). This Amendment No. 1 is being filed to report that the Reporting Persons are no longer beneficial owners of more than 5% of the Shares. The filing of this Amendment No. 1 represents the final amendment to this Schedule 13D and constitutes an exit filing for the Reporting Persons.

Except as set forth below, all Items of the Schedule 13D remain unchanged. All capitalized terms not otherwise defined herein shall have the meanings ascribed to such terms in the Schedule 13D.

ITEM 4.

PURPOSE OF TRANSACTION

Item 4 of the Schedule 13D is hereby amended to add the following information for updating:

Since the filing of Schedule D on November 24, 2023, on May 16, 2023, the Issuer consummated the merger (the “Merger”) pursuant to which each issued and outstanding Share was cancelled and converted into the right to receive $54.00 in cash, without interest. In connection with the Merger, the Reporting Persons’ 1,020,537 Shares, which consisted of 44,194 Shares sold for the benefit of Relative Value Master Fund, 201,120 Shares sold for the benefit of Systematic Master Fund and 775,223 Shares sold for the benefit of PRA Master Fund, were cancelled and converted into the right to receive $54.00 in cash, without interest. The Managed Account had disposed of its shares before the Merger.

ITEM 5.

INTEREST IN SECURITIES OF THE ISSUER

Item 5(a)-(c) and (e) of the Schedule 13D is hereby amended to add the following information for updating:

(a)            As of the closing of the Merger on May 16, 2024, each of the Reporting Persons may have been deemed to have beneficial ownership of 0 Shares.

(b)            As of the closing of the Merger on May 16, 2024, each of the Reporting Persons may have been deemed to share the power to vote and direct the disposition of 0 Shares, which represented beneficial ownership of 0% of the Shares.

(c)            The response to Item 4 of this Amendment No. 1 is incorporated herein by reference. Except as set forth in Item 4 of this Amendment No. 1, the Funds had no transactions in the Shares since the filing of the Schedule D on November 24, 2023.

(d)            As of May 16, 2024, the Reporting Persons ceased to be beneficial owners of more than five percent of the Shares.

SCHEDULE A

Funds

Date	Number of Shares Bought	Price Per Share($) ⁽¹⁾⁽²⁾
12/4/2023	5781	50.91079 ⁽³⁾
12/5/2023	9154	51.15824 ⁽⁴⁾
12/6/2023	3864	51.34352 ⁽⁵⁾
12/7/2023	3986	51.37196⁽⁶⁾

(1) Excludes commissions and other execution-related costs.

(2) Upon request by the staff of the Securities and Exchange Commission, full information regarding the number of shares bought or sold (as the case may be) at each separate price will be provided.

(3) Reflects a weighted average purchase price of $50.91079 per share, at prices ranging from $50.78 to $51.07 per share.

(4) Reflects a weighted average purchase price of $51.15824 per share, at prices ranging from $50.79 to $51.415 per share.

(5) Reflects a weighted average purchase price of $51.34352 per share, at prices ranging from $51.24 to $51.47 per share.

(6) Reflects a weighted average purchase price of $51.37196 per share, at prices ranging from $51.3 to $51.49 per share.

Funds

Date	Number of Shares Sold	Price Per Share($) ⁽¹⁾⁽²⁾
5/13/2024	3800	$53.50316 ⁽³⁾
5/14/2024	676	$53.91464⁽⁴⁾

	(1)	Excludes commissions and other execution-related costs.
	(2)	Upon request by the staff of the Securities and Exchange Commission, full information regarding the number of shares bought or sold (as the case may be) at each separate price will be provided.
	(3)	Reflects a weighted average sale price of $53.50316 per Share, at prices ranging from $53.5 to $53.51 per Share.
	(4)	Reflects a weighted average sale price of $53.91464 per Share, at prices ranging from $53.59 to $53.975 per Share.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated:    May 21, 2024

	magnetar financial llc

	By:	Magnetar Capital Partners LP, its Sole Member
	By:	Supernova Management LLC, its General Partner

	By:	/s/ Hayley A. Stein
	Name:	Hayley A. Stein
	Title:	Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC

	magnetar capital partners LP

	By:	Supernova Management LLC, its General Partner

	By:	/s/ Hayley A. Stein
	Name:	Hayley A. Stein
	Title:	Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC

	supernova management llc

	By:	/s/ Hayley A. Stein
	Name:	Hayley A. Stein
	Title:	Attorney-in-fact for David J. Snyderman, Manager

	DAVID J. SNYDERMAN

	By:	/s/ Hayley A. Stein
	Name:	Hayley A. Stein
	Title:	Attorney-in-fact for David J. Snyderman

EXHIBIT INDEX

Exhibit No.		Description

99.1		Joint Filing Agreement, dated as of May 21, 2024, among the Reporting Persons.
99.2		Power of Attorney, dated as of December 22, 2022 filed by the Reporting Persons on May 21, 2024.

SP Plus Corp SC 13D/A