RYZ

SEC source: 0000899140-26-000342 · form4.xml · derivative · entry 2

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,931.179

Underlying: Common Stock · 239.189 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-26-000342 · form4.xml · derivative · entry 1

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,257.021

Underlying: Common Stock · 122.283 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-26-000340 · form4.xml · derivative · entry 3

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,651.098

Underlying: Common Stock · 125.918 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-26-000340 · form4.xml · derivative · entry 2

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,250.881

Underlying: Common Stock · 76.106 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-26-000340 · form4.xml · derivative · entry 1

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,218.615

Underlying: Common Stock · 38.913 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of March 19, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-26-000310 · form4.xml · derivative · entry 4

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,000 shares

Expires 2031-03-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000899140-26-000310 · form4.xml · derivative · entry 3

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Common Stock · 3,750 shares

Expires 2031-03-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000899140-26-000310 · form4.xml · nonDerivative · entry 2

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 601,978.4833

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000899140-26-000310 · form4.xml · nonDerivative · entry 1

Lehner Edward J. · CIK 0001614103 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 596,978.4833

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0000899140-26-000208 · form4.xml · nonDerivative · entry 1

SIEGAL MICHAEL D · CIK 0000940858 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,825,226

F1 · price: The Reporting Person received 1,825,226 shares of the Issuer's common stock in exchange for 1,067,072 shares of common stock, without par value, of Olympic Steel, Inc. ("Olympic Steel") in connection with the merger between Olympic Steel and the Issuer (the "Merger") pursuant to the terms of the Agreement and Plan of Merger, dated as of October 28, 2025 (the "Merger Agreement"), by and among the Issuer, Olympic Steel and Crimson MS Corp. In accordance with the Merger Agreement, each share of Olympic Steel's common stock was cancelled and converted into the right to receive 1.7105 shares of the Issuer's common stock, with cash paid in lieu of fractional shares.

SEC source: 0000899140-26-000210 · form4.xml · nonDerivative · entry 1

Scott Peter Jennings · CIK 0002067615 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,603

F1 · price: The Reporting Person received 8,603 shares of the Issuer's common stock in exchange for 5,030 shares of common stock, without par value, of Olympic Steel, Inc. ("Olympic Steel") in connection with the merger between Olympic Steel and the Issuer (the "Merger") pursuant to the terms of the Agreement and Plan of Merger, dated as of October 28, 2025 (the "Merger Agreement"), by and among the Issuer, Olympic Steel and Crimson MS Corp. In accordance with the Merger Agreement, each share of Olympic Steel's common stock was cancelled and converted into the right to receive 1.7105 shares of the Issuer's common stock, with cash paid in lieu of fractional shares.

SEC source: 0000899140-26-000206 · form4.xml · derivative · entry 6

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,254

Underlying: Common Stock · 94,254 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F11 · derivative.exercise_date: The Reporting Person received a one-time sign-on restricted stock unit award in connection with the Merger, which will vest on the third anniversary of the closing date of the Merger. Vested shares will be delivered to the reporting person upon vesting.

F11 · derivative.expiration_date: The Reporting Person received a one-time sign-on restricted stock unit award in connection with the Merger, which will vest on the third anniversary of the closing date of the Merger. Vested shares will be delivered to the reporting person upon vesting.

SEC source: 0000899140-26-000206 · form4.xml · derivative · entry 5

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,263

Underlying: Common Stock · 10,263 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F10 · price: The Reporting Person received 10,263 restricted stock units of the Issuer in exchange for restricted stock units with respect to 6,000 shares of Olympic Steel's common stock.

F9 · derivative.exercise_date: The restricted stock units will vest on December 31, 2027. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

F9 · derivative.expiration_date: The restricted stock units will vest on December 31, 2027. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

SEC source: 0000899140-26-000206 · form4.xml · derivative · entry 4

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,257

Underlying: Common Stock · 10,257 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F8 · price: The Reporting Person received 10,257 restricted stock units of the Issuer in exchange for restricted stock units with respect 5,997 shares of Olympic Steel's common stock.

F7 · derivative.exercise_date: The restricted stock units will vest on December 31, 2026. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

F7 · derivative.expiration_date: The restricted stock units will vest on December 31, 2026. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

SEC source: 0000899140-26-000206 · form4.xml · derivative · entry 3

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,844

Underlying: Common Stock · 26,844 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F6 · price: The Reporting Person received 26,844 restricted stock units of the Issuer in exchange for restricted stock units with respect to 15,694 shares of Olympic Steel's common stock.

F3 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F3 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000206 · form4.xml · derivative · entry 2

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,085

Underlying: Common Stock · 18,085 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F5 · price: The Reporting Person received 18,085 restricted stock units of the Issuer in exchange for restricted stock units with respect to 10,573 shares of Olympic Steel's common stock.

F3 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F3 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000206 · form4.xml · nonDerivative · entry 1

Greiff Andrew S · CIK 0001682850 · EVP

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,975

F1 · price: The Reporting Person received 33,975 shares of the Issuer's common stock in exchange for 19,863 shares of common stock, without par value, of Olympic Steel, Inc. ("Olympic Steel") in connection with the merger between Olympic Steel and the Issuer (the "Merger") pursuant to the terms of the Agreement and Plan of Merger, dated as of October 28, 2025 (the "Merger Agreement"), by and among the Issuer, Olympic Steel and Crimson MS Corp. In accordance with the Merger Agreement, each share of Olympic Steel's common stock was cancelled and converted into the right to receive 1.7105 shares (the "Exchange Ratio") of the Issuer's common stock, with cash paid in lieu of fractional shares.

SEC source: 0000899140-26-000209 · form4.xml · derivative · entry 4

Stovsky Richard P · CIK 0001747237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,784

Underlying: Common Stock · 2,784 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F5 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F8 · price: The Reporting Person received 2,784 restricted stock units of the Issuer in exchange for restricted stock units with respect to 1,628 shares of Olympic Steel's common stock.

F4 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F4 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000209 · form4.xml · derivative · entry 3

Stovsky Richard P · CIK 0001747237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,435

Underlying: Common Stock · 4,435 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F5 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F7 · price: The Reporting Person received 4,435 restricted stock units of the Issuer in exchange for restricted stock units with respect to 2,593 shares of Olympic Steel's common stock.

F4 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F4 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000209 · form4.xml · derivative · entry 2

Stovsky Richard P · CIK 0001747237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,873

Underlying: Common Stock · 5,873 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F5 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F6 · price: The Reporting Person received 5,873 restricted stock units of the Issuer in exchange for restricted stock units with respect to 3,434 shares of Olympic Steel's common stock.

F4 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F4 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000209 · form4.xml · nonDerivative · entry 1

Stovsky Richard P · CIK 0001747237 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,499

F1 · price: The Reporting Person received 12,488 shares of the Issuer's common stock in exchange for 7,301 shares of common stock, without par value, of Olympic Steel, Inc. ("Olympic Steel") in connection with the merger between Olympic Steel and the Issuer (the "Merger") pursuant to the terms of the Agreement and Plan of Merger, dated as of October 28, 2025 (the "Merger Agreement"), by and among the Issuer, Olympic Steel and Crimson MS Corp. In accordance with the Merger Agreement, each share of Olympic Steel's common stock was cancelled and converted into the right to receive 1.7105 shares (the "Exchange Ratio") of the Issuer's common stock, with cash paid in lieu of fractional shares.

F2 · price: The Reporting Person received 5,011 shares of the Issuer's common stock in exchange for restricted stock awards with respect to 2,930 shares of Olympic Steel's common stock, in connection with the Merger pursuant to the terms of the Merger Agreement. Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock awards vested and converted into shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock award prior to the effective time of the Merger by (ii) the Exchange Ratio.

SEC source: 0000899140-26-000207 · form4.xml · derivative · entry 6

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,496

Underlying: Common Stock · 150,496 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F11 · derivative.exercise_date: The Reporting Person received a one-time sign-on restricted stock unit award in connection with the Merger, which will vest on the third anniversary of the closing date of the Merger. Vested shares will be delivered to the reporting person upon vesting.

F11 · derivative.expiration_date: The Reporting Person received a one-time sign-on restricted stock unit award in connection with the Merger, which will vest on the third anniversary of the closing date of the Merger. Vested shares will be delivered to the reporting person upon vesting.

SEC source: 0000899140-26-000207 · form4.xml · derivative · entry 5

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,815

Underlying: Common Stock · 18,815 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F10 · price: The Reporting Person received 18,815 restricted stock units of the Issuer in exchange for restricted stock units with respect to 11,000 shares of Olympic Steel's common stock.

F9 · derivative.exercise_date: The restricted stock units will vest on December 31, 2027. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

F9 · derivative.expiration_date: The restricted stock units will vest on December 31, 2027. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

SEC source: 0000899140-26-000207 · form4.xml · derivative · entry 4

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,104

Underlying: Common Stock · 14,104 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F8 · price: The Reporting Person received 14,104 restricted stock units of the Issuer in exchange for restricted stock units with respect to 8,246 shares of Olympic Steel's common stock.

F7 · derivative.exercise_date: The restricted stock units will vest on December 31, 2026. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

F7 · derivative.expiration_date: The restricted stock units will vest on December 31, 2026. Vested shares will be delivered to the reporting person within 90 days following the vesting date.

SEC source: 0000899140-26-000207 · form4.xml · derivative · entry 3

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 88,101

Underlying: Common Stock · 88,101 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F6 · price: The Reporting Person received 88,101 restricted stock units of the Issuer in exchange for restricted stock units with respect to 51,506 shares of Olympic Steel's common stock.

F3 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F3 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000207 · form4.xml · derivative · entry 2

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,005

Underlying: Common Stock · 33,005 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

F4 · price: Pursuant to the Merger Agreement, at the effective time, the reporting person's Olympic Steel restricted stock units were assumed and converted into restricted stock units with respect to a number of shares of the Issuer's common stock (rounded down to the nearest whole share) determined by multiplying (i) the number of shares of Olympic Steel common stock subject to the Olympic Steel restricted stock unit immediately prior to the effective time of the Merger by (ii) the Exchange Ratio. The converted restricted stock units will otherwise be subject to the same terms and conditions as were applicable to the Olympic Steel restricted stock units prior to the effective time of the Merger.

F5 · price: The Reporting Person received 33,005 restricted stock units of the Issuer in exchange for restricted stock units with respect to 19,296 shares of Olympic Steel's common stock.

F3 · derivative.exercise_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

F3 · derivative.expiration_date: The restricted stock units have fully vested. Vested shares will be delivered to the reporting person upon separation of service.

SEC source: 0000899140-26-000207 · form4.xml · nonDerivative · entry 1

MARABITO RICHARD T · CIK 0001255662 · Director · President & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 125,292

F1 · price: The Reporting Person received 125,292 shares of the Issuer's common stock in exchange for 73,249 shares of common stock, without par value, of Olympic Steel, Inc. ("Olympic Steel") in connection with the merger between Olympic Steel and the Issuer (the "Merger") pursuant to the terms of the Agreement and Plan of Merger, dated as of October 28, 2025 (the "Merger Agreement"), by and among the Issuer, Olympic Steel and Crimson MS Corp. In accordance with the Merger Agreement, each share of Olympic Steel's common stock was cancelled and converted into the right to receive 1.7105 shares (the "Exchange Ratio") of the Issuer's common stock, with cash paid in lieu of fractional shares.

SEC source: 0000899140-26-000098 · form4.xml · nonDerivative · entry 1

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,284.3365

F1 · kind: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 30, 2025.

SEC source: 0000899140-26-000067 · form4.xml · nonDerivative · entry 2

Lehner Edward J. · CIK 0001614103 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 593,228.4833

F1 · kind: The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 28, 2025.

F3 · price: These shares were sold in multiple transactions at an average price of $30.06 per share. The reporting person undertakes to provide Ryerson Holding Corporation, any security holder of Ryerson Holding Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price factored into the average price set forth in this footnote.

SEC source: 0000899140-26-000067 · form4.xml · nonDerivative · entry 1

Lehner Edward J. · CIK 0001614103 · Director · President & CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 652,229.4833

F1 · kind: The sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 28, 2025.

F2 · price: These shares were sold in multiple transactions at prices between $30.000 and $30.035. The reporting person undertakes to provide Ryerson Holding Corporation, any security holder of Ryerson Holding Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0000899140-26-000024 · form4.xml · nonDerivative · entry 1

Leggio Karen Marie · CIK 0002021777 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,883

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date.

SEC source: 0000899140-26-000022 · form4.xml · nonDerivative · entry 1

Crawford Bruce T · CIK 0001869223 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,063

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date.

SEC source: 0000899140-26-000025 · form4.xml · nonDerivative · entry 1

Kumbier Michelle · CIK 0001640036 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,756

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date.

SEC source: 0000899140-26-000023 · form4.xml · nonDerivative · entry 1

Larson Stephen P. · CIK 0001624556 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,531

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date

SEC source: 0000899140-26-000021 · form4.xml · nonDerivative · entry 1

CARRUTHERS COURT D · CIK 0001422164 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,687

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date.

SEC source: 0000899140-26-000020 · form4.xml · nonDerivative · entry 1

CALHOUN KIRK K · CIK 0001203721 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,187

F1 · shares: Reflects compensation in the form of equity received pursuant to Ryerson's Director Compensation Program. The award vested in full on the grant date.

SEC source: 0000899140-25-001457 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,762.591

Underlying: Common Stock · 48.643 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-25-001457 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,087.901

Underlying: Common Stock · 29.404 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-25-001457 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,089.852

Underlying: Common Stock · 15.033 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-25-001456 · form4.xml · derivative · entry 3

Silver Mark S. · CIK 0001627959 · EVP, GC & Chief HR Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,143.886

Underlying: Common Stock · 72.964 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-25-001456 · form4.xml · derivative · entry 2

Silver Mark S. · CIK 0001627959 · EVP, GC & Chief HR Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,839.417

Underlying: Common Stock · 42.003 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-25-001456 · form4.xml · derivative · entry 1

Silver Mark S. · CIK 0001627959 · EVP, GC & Chief HR Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,985.357

Underlying: Common Stock · 21.474 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-25-001455 · form4.xml · derivative · entry 3

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,525.18

Underlying: Common Stock · 97.285 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-25-001455 · form4.xml · derivative · entry 2

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,174.775

Underlying: Common Stock · 58.801 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-25-001455 · form4.xml · derivative · entry 1

Claussen James J · CIK 0001841035 · Executive Vice President & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,179.702

Underlying: Common Stock · 30.065 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-25-001454 · form4.xml · derivative · entry 3

Lehner Edward J. · CIK 0001614103 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,194.244

Underlying: Common Stock · 267.534 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-25-001454 · form4.xml · derivative · entry 2

Lehner Edward J. · CIK 0001614103 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,691.99

Underlying: Common Stock · 184.8 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

SEC source: 0000899140-25-001454 · form4.xml · derivative · entry 1

Lehner Edward J. · CIK 0001614103 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,134.738

Underlying: Common Stock · 94.477 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026.

SEC source: 0000899140-25-001453 · form4.xml · derivative · entry 3

Sundarrajan Alagu · CIK 0001848292 · Chief Information Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,762.591

Underlying: Common Stock · 48.643 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026, March 31, 2027 and March 31, 2028.

SEC source: 0000899140-25-001453 · form4.xml · derivative · entry 2

Sundarrajan Alagu · CIK 0001848292 · Chief Information Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,087.901

Underlying: Common Stock · 29.404 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Ryerson Holding Corporation (the "Company").

F2 · shares: Represents dividend equivalent rights that accrued on the underlying award of restricted stock units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted stock units to which they relate.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 18, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2026 and March 31, 2027.