X0202 SCHEDULE 13G/A 0001228754 XXXXXXXX LIVE 4 Common Stock, par value $0.01 per share 06/30/2026 0001481582 Ryerson Holding Corporation 783754104 227 W. Monroe St., 27th Floor Chicago IL 60606 Rule 13d-1(d) Platinum Equity, LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO Platinum Equity Investment Holdings, LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO Platinum Equity Investment Holdings IC (Cayman), LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO Platinum Equity InvestCo, L.P. E9 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 PN Platinum Equity Investment Holdings II, LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO Platinum Equity Partners II, LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO RYPS, LLC DE 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 OO Tom Gores X1 0.00 1924478.00 0.00 1924478.00 1924478.00 N 3.7 IN Ryerson Holding Corporation 227 W. Monroe St., 27th Floor, Chicago, IL 60606 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 The principal business address of each of the Reporting Persons is 360 North Crescent Drive, Beverly Hills, CA 90210. 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. Y The ownership information presented below represents beneficial ownership of Common Stock of the Issuer as of the date of this filing, based upon 51,898,653 shares of Common Stock outstanding as of July 24, 2026, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on July 29, 2026. 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. See Item 11 of each of the cover pages hereto. See Item 5 of each of the cover pages hereto. See Item 6 of each of the cover pages hereto. See Item 7 of each of the cover pages hereto. See Item 8 of each of the cover pages hereto. N Y Y Y Y Y Y Exhibit No. 24 Power of Attorney (previously filed). Exhibit No. 99 Joint Filing Agreement (previously filed). Platinum Equity, LLC /s/ Mary Ann Sigler 08/14/2026 Platinum Equity Investment Holdings, LLC /s/ Mary Ann Sigler 08/14/2026 Platinum Equity Investment Holdings IC (Cayman), LLC /s/ Mary Ann Sigler 08/14/2026 Platinum Equity InvestCo, L.P. By: Platinum Equity Investment Holdings IC (Cayman), LLC, its general partner, By: /s/ Mary Ann Sigler 08/14/2026 Platinum Equity Investment Holdings II, LLC /s/ Mary Ann Sigler 08/14/2026 Platinum Equity Partners II, LLC /s/ Mary Ann Sigler 08/14/2026 RYPS, LLC /s/ Mary Ann Sigler 08/14/2026 Tom Gores /s/ Mary Ann Sigler 08/14/2026