Platinum Equity SC 13G/A Ryerson Holding / PLATINUM EQUITY ownership change

Securities and Exchange Commission

Washington, D.C. 20549

Schedule 13G

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant

to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed

Pursuant to § 240.13d-2

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)*

Ryerson Holding Corporation

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

783754104

(CUSIP Number)

December 31, 2023

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

¨ Rule 13d-1(c)

x Rule 13d-1(d)

* 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 the disclosures provided in a prior cover page.

The information required in 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. 783754104

Schedule 13G

Page 2 of 16

1	Names of Reporting Persons Platinum Equity, LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person OO (Limited Liability Company)

CUSIP No. 783754104

Schedule 13G

Page 3 of 16

1	Names of Reporting Persons Platinum Equity Investment Holdings, LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person OO (Limited Liability Company)

CUSIP No. 783754104

Schedule 13G

Page 4 of 16

1	Names of Reporting Persons Platinum Equity Investment Holdings IC (Cayman), LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person OO (Limited Liability Company)

CUSIP No. 783754104

Schedule 13G

Page 5 of 16

1	Names of Reporting Persons Platinum Equity InvestCo, L.P.
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Cayman Islands

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person PN

CUSIP No. 783754104

Schedule 13G

Page 6 of 16

1	Names of Reporting Persons Platinum Equity Investment Holdings II, LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person PN

CUSIP No. 783754104

Schedule 13G

Page 7 of 16

1	Names of Reporting Persons Platinum Equity Partners II, LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person OO (Limited Liability Company)

CUSIP No. 783754104

Schedule 13G

Page 8 of 16

1	Names of Reporting Persons RYPS, LLC
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization Delaware

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person OO (Limited Liability Company)

CUSIP No. 783754104

Schedule 13G

Page 9 of 16

1	Names of Reporting Persons Tom Gores
2	Check the Appropriate Box if a Member of a Group	(a) ¨ (b) ¨
3	SEC Use Only
4	Citizenship or Place of Organization United States

Number of Shares Beneficially Owned by Each Reporting Person With	5	Sole Voting Power 0
	6	Shared Voting Power 3,924,478
	7	Sole Dispositive Power 0
	8	Shared Dispositive Power 3,924,478

9	Aggregate Amount Beneficially Owned by Each Reporting Person 3,924,478
10	Check if the Aggregate Amount in Row (9) Excludes Certain Shares Not Applicable
11	Percent of Class Represented by Amount in Row 9 11.5%
12	Type of Reporting Person IN

CUSIP No. 783754104

Schedule 13G

Page 10 of 16

ITEM 1.

(a)

Name of Issuer:

Ryerson Holding Corporation (the “Issuer”).

(b)

Address of Issuer’s Principal Executive Offices:

227 W. Monroe St., 27th Floor, Chicago, IL 60606

ITEM 2.

(a)

Name of Person Filing:

Each of the following is hereinafter individually referred to as a “Reporting Person” and collectively as the “Reporting Persons.” This statement is filed on behalf of:

Platinum Equity, LLC

Platinum Equity Investment Holdings, LLC

Platinum Equity Investment Holdings IC (Cayman), LLC

Platinum Equity InvestCo, L.P.

Platinum Equity Investment Holdings II, LLC

Platinum Equity Partners II, LLC

RYPS, LLC

Tom Gores

(b)

Address or Principal Business Office:

The principal business address of each of the Reporting Persons is 360 North Crescent Drive, Beverly Hills, CA 90210.

(c)

Citizenship of each Reporting Person is:

Platinum Equity InvestCo, L.P. is organized under the laws of the Cayman Islands. Tom Gores is a citizen of the United States. Each of the remaining Reporting Persons is organized under the laws of the State of Delaware.

(d)

Title of Class of Securities:

Common Stock, par value $0.01 per share (“Common Stock”).

CUSIP No. 783754104

Schedule 13G

Page 11 of 16

(e)

CUSIP Number:

783754104

ITEM 3.

                                Not applicable.

   CUSIP No. 783754104

Schedule 13G

Page 12 of 16

ITEM 4.

Ownership.

(a-c)

The ownership information presented below represents beneficial ownership of Common Stock of the Issuer as of December 31, 2023, based upon 34,171,334 shares of Common Stock outstanding as of October 26, 2023, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on October 30, 2023.

Reporting Person	Amount beneficially owned		Percent of class:			Sole power to vote or to direct the vote:		Shared power to vote or to direct the vote:		Sole power to dispose or to direct the disposition of:		Shared power to dispose or to direct the disposition of:
Platinum Equity, LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Platinum Equity Investment Holdings, LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Platinum Equity Investment Holdings IC (Cayman), LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Platinum Equity InvestCo, L.P.		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Platinum Equity Investment Holdings II, LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Platinum Equity Partners II, LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
RYPS, LLC		3,924,478		11.5	%		0		3,924,478		0		3,924,478
Tom Gores		3,924,478		11.5	%		0		3,924,478		0		3,924,478

RYPS, LLC is the record holder of the securities reported herein.

Tom Gores is the manager of Platinum Equity, LLC, which is the sole member of Platinum Equity Investment Holdings, LLC, which is the sole member of Platinum Equity Investment Holdings IC (Cayman), LLC which is the general partner of Platinum Equity InvestCo, L.P., which is the sole member of Platinum Equity Investment Holdings II, LLC, which is the senior managing member of Platinum Equity Partners II, LLC, which is the general partner of members controlling a majority of the membership interest of RYPS, LLC. By virtue of these relationships, each of these entities and Mr. Gores may be deemed to share beneficial ownership of the securities held of record by RYPS, LLC.

ITEM 5.

Ownership of Five Percent or Less of a Class.

Not applicable.

  CUSIP No. 783754104

Schedule 13G

Page 13 of 16

ITEM 6.

Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

ITEM 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not applicable.

ITEM 8.

Identification and Classification of Members of the Group.

Not applicable.

ITEM 9.

Notice of Dissolution of Group.

Not applicable.

ITEM 10.

Certification.

Not applicable.

  CUSIP No. 783754104

Schedule 13G

Page 14 of 16

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.

Date: February 12, 2024


	Platinum Equity, LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	Executive Vice President, Chief Financial Officer and Treasurer

	Platinum Equity Investment Holdings, LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	Secretary

	Platinum Equity Investment Holdings IC (Cayman), LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	President

	Platinum Equity InvestCo, L.P.

	By:	Platinum Equity Investment Holdings IC (Cayman), LLC, its general partner

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	President

	Platinum Equity Investment Holdings II, LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	Secretary

	Platinum Equity Partners II, LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	Secretary

  CUSIP No. 783754104

Schedule 13G

Page 15 of 16

	RYPS, LLC

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	President

	Tom Gores

	By:	/s/ Mary Ann Sigler
	Name:	Mary Ann Sigler
	Title:	Attorney-in-Fact

  CUSIP No. 783754104

Schedule 13G

Page 16 of 16

LIST OF EXHIBITS

Exhibit No.	Description

24	Power of Attorney (previously filed).

99	Joint Filing Agreement (previously filed).

Platinum Equity SC 13G/ARyerson Holding / PLATINUM EQUITY ownership change