Kannan Molly D

SEC source: 0000899140-26-001072 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,695.158

Underlying: Common Stock · 50.482 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, 2026 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027, March 31, 2028, and March 31, 2029.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2026 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027, March 31, 2028, and March 31, 2029.

SEC source: 0000899140-26-001072 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,616.159

Underlying: Common Stock · 34.806 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, 2025 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027 and March 31, 2028.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027 and March 31, 2028.

SEC source: 0000899140-26-001072 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,092.702

Underlying: Common Stock · 15.779 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, 2024 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of September 17, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027.

SEC source: 0000899140-26-000750 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 24,136.4636

F1 · kind: These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026.

SEC source: 0000899140-26-000680 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,644.676

Underlying: Common Stock · 44.676 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, 2026 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027, March 31, 2028, and March 31, 2029.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2026 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027, March 31, 2028, and March 31, 2029.

SEC source: 0000899140-26-000680 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,581.353

Underlying: Common Stock · 30.803 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, 2025 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027 and March 31, 2028.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2025 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027 and March 31, 2028.

SEC source: 0000899140-26-000680 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,076.923

Underlying: Common Stock · 13.964 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.

F3 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of June 18, 2026. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2027.

SEC source: 0000899140-26-000638 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 24,636.4636

F1 · kind: These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026.

SEC source: 0000899140-26-000613 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 25,636.4636

F1 · kind: These sales were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026.

F2 · price: These shares were sold in multiple transactions at the price of $28.42. 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.

SEC source: 0000899140-26-000582 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,636.4636

F1 · price: These shares were sold in multiple transactions at prices between $26.180 and $26.235. 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: 0000899140-26-000355 · form4.xml · derivative · entry 9

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,600

Underlying: Common Stock · 6,600 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 Company.

F11 · derivative.exercise_date: On March 31, 2026, the reporting person was granted 6,600 restricted stock units, of which 2,200 will vest on the first anniversary of the grant date, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F11 · derivative.expiration_date: On March 31, 2026, the reporting person was granted 6,600 restricted stock units, of which 2,200 will vest on the first anniversary of the grant date, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

SEC source: 0000899140-26-000355 · form4.xml · derivative · entry 8

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,550.55

Underlying: Common Stock · 2,275 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F9 · derivative.exercise_date: On March 31, 2025, the reporting person was granted 6,600 restricted stock units, of which 2,200 vested on the first anniversary of the grant date. Of the remaining unvested restricted stock units, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F10 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2025. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F9 · derivative.expiration_date: On March 31, 2025, the reporting person was granted 6,600 restricted stock units, of which 2,200 vested on the first anniversary of the grant date. Of the remaining unvested restricted stock units, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F10 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2025. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

SEC source: 0000899140-26-000355 · form4.xml · derivative · entry 7

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,062.959

Underlying: Common Stock · 2,063 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F7 · derivative.exercise_date: On March 31, 2024, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date and 1,925 vested on the second anniversary of the grant date. All 1,925 of the remaining unvested restricted stock units will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F8 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2024. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F7 · derivative.expiration_date: On March 31, 2024, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date and 1,925 vested on the second anniversary of the grant date. All 1,925 of the remaining unvested restricted stock units will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F8 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2024. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

SEC source: 0000899140-26-000355 · form4.xml · derivative · entry 6

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,110 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F5 · derivative.exercise_date: On March 31, 2023, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date, 1,925 vested on the second anniversary of the grant date and 1,925 vested on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F6 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2023. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F5 · derivative.expiration_date: On March 31, 2023, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date, 1,925 vested on the second anniversary of the grant date and 1,925 vested on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F6 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2023. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

SEC source: 0000899140-26-000355 · form4.xml · nonDerivative · entry 5

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,136.4636

F12 · shares: Represents shares that have been withheld by the Company to satisfy its income tax and withholding remittance obligations in connection with the net settlement of restricted stock units.

SEC source: 0000899140-26-000355 · form4.xml · nonDerivative · entry 4

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,827.4636

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.

F2 · price: Represents shares received or that will be received in respect of performance-based restricted stock units granted on March 31, 2023. Each performance-based restricted stock unit became vested on March 31, 2026, which was the later of (i) the third anniversary of the grant date and (ii) the date the compensation committee certified the achievement of the applicable performance objectives in accordance with the underlying award agreement. The compensation committee certified the achievement of the applicable performance objectives on March 31, 2026. Vested shares will be delivered to the reporting person not later than 60 days following the vesting date.

SEC source: 0000899140-26-000355 · form4.xml · nonDerivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,964.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

SEC source: 0000899140-26-000355 · form4.xml · nonDerivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,689.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

SEC source: 0000899140-26-000355 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,626.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

SEC source: 0000899140-26-000343 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,825.55

Underlying: Common Stock · 62.959 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: 0000899140-26-000343 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,125.959

Underlying: Common Stock · 38.058 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: 0000899140-26-000343 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,109.309

Underlying: Common Stock · 19.457 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: 0000899140-25-001457 · 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: 0000899140-25-001133 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,713.948

Underlying: Common Stock · 53.758 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 September 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 September 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: 0000899140-25-001133 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,058.497

Underlying: Common Stock · 32.496 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 September 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 September 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: 0000899140-25-001133 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,074.819

Underlying: Common Stock · 16.613 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 September 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 September 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: 0001799091-25-000002 · primary_doc.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,516.4636

F1 · price: These shares were sold in multiple transactions at the price of $22.42. 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.

SEC source: 0000899140-25-000783 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,660.19

Underlying: Common Stock · 60.19 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 June 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 June 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: 0000899140-25-000783 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,026.001

Underlying: Common Stock · 36.384 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 June 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 June 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: 0000899140-25-000783 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,058.206

Underlying: Common Stock · 18.601 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 June 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 June 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: 0000899140-25-000493 · form4.xml · derivative · entry 9

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,600

Underlying: Common Stock · 6,600 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 Company.

F11 · derivative.exercise_date: On March 31, 2025, the reporting person was granted 6,600 restricted stock units, of which 2,200 will vest on the first anniversary of the grant date, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F11 · derivative.expiration_date: On March 31, 2025, the reporting person was granted 6,600 restricted stock units, of which 2,200 will vest on the first anniversary of the grant date, 2,200 will vest on the second anniversary of the grant date and 2,200 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

SEC source: 0000899140-25-000493 · form4.xml · derivative · entry 8

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,989.617

Underlying: Common Stock · 1,994 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F9 · derivative.exercise_date: On March 31, 2024, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date. Of the remaining unvested restricted stock units, 1,925 will vest on the second anniversary of the grant date and 1,925 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F10 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2024. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.exercise_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

F9 · derivative.expiration_date: On March 31, 2024, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date. Of the remaining unvested restricted stock units, 1,925 will vest on the second anniversary of the grant date and 1,925 will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F10 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2024. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.expiration_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000493 · form4.xml · derivative · entry 7

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,039.605

Underlying: Common Stock · 2,039 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F7 · derivative.exercise_date: On March 31, 2023, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date and 1,925 vested on the second anniversary of the grant date. All 1,925 of the remaining unvested restricted stock units will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F8 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2023. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.exercise_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

F7 · derivative.expiration_date: On March 31, 2023, the reporting person was granted 5,775 restricted stock units, of which 1,925 vested on the first anniversary of the grant date and 1,925 vested on the second anniversary of the grant date. All 1,925 of the remaining unvested restricted stock units will vest on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F8 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2023. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.expiration_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000493 · form4.xml · derivative · entry 6

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,785 shares

Expires not disclosed

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.

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

F4 · price: The restricted stock units reported as disposed herein were settled for shares of common stock of the Company.

F5 · derivative.exercise_date: On March 31, 2022, the reporting person was granted 4,950 restricted stock units, of which 1,650 vested on the first anniversary of the grant date, 1,650 vested on the second anniversary of the grant date and 1,650 vested on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F6 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2022. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.exercise_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

F5 · derivative.expiration_date: On March 31, 2022, the reporting person was granted 4,950 restricted stock units, of which 1,650 vested on the first anniversary of the grant date, 1,650 vested on the second anniversary of the grant date and 1,650 vested on the third anniversary of the grant date. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F6 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of underlying restricted stock units that were granted on March 31, 2022. The dividend equivalent rights accrued when and as the Company declared quarterly dividends and vested proportionately with the restricted stock unit to which they related. Vested shares will be delivered to the reporting person not later than 60 days following such vesting dates.

F13 · derivative.expiration_date: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

F14 · balance_after: The number of restricted stock units owned by the reporting person following the reported transaction has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000493 · form4.xml · nonDerivative · entry 5

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,044.4636

F12 · shares: Represents shares that have been withheld by the Company to satisfy its income tax and withholding remittance obligations in connection with the net settlement of restricted stock units.

SEC source: 0000899140-25-000493 · form4.xml · nonDerivative · entry 4

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,048.4636

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.

F2 · price: Represents shares received or that will be received in respect of performance-based restricted stock units granted on March 31, 2022. Each performance-based restricted stock unit became vested on March 31, 2025, which was the later of (i) the third anniversary of the grant date and (ii) the date the compensation committee certified the achievement of the applicable performance objectives in accordance with the underlying award agreement. The compensation committee certified the achievement of the applicable performance objectives on March 31, 2025. Vested shares will be delivered to the reporting person not later than 60 days following the vesting date.

SEC source: 0000899140-25-000493 · form4.xml · nonDerivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,998.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

F13 · price: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000493 · form4.xml · nonDerivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,004.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

F13 · price: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000493 · form4.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,965.4636

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.

F1 · price: Represents shares received upon the vesting of restricted stock units and shares received upon the vesting of dividend equivalent rights granted in connection with the quarterly dividends declared by Ryerson Holding Corporation (the "Company"). Dividend equivalent rights are subject to the same terms and conditions, including vesting, as the underlying restricted stock units.

F13 · price: The number of dividend equivalent rights settled in connection with the vesting of underlying restricted stock units has been rounded to a whole number. This reflects a change in the reporting methodology.

SEC source: 0000899140-25-000455 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,983.617

Underlying: Common Stock · 45.538 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, 2024 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

SEC source: 0000899140-25-000455 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,078.605

Underlying: Common Stock · 31.04 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, 2023 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

SEC source: 0000899140-25-000455 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,784.322

Underlying: Common Stock · 13.58 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, 2022 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2022 and outstanding as of March 20, 2025. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025.

SEC source: 0000899140-24-001380 · form4.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,938.079

Underlying: Common Stock · 55.733 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, 2024 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

SEC source: 0000899140-24-001380 · form4.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,047.565

Underlying: Common Stock · 37.989 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, 2023 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

SEC source: 0000899140-24-001380 · form4.xml · derivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,770.742

Underlying: Common Stock · 16.62 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, 2022 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025.

F3 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2022 and outstanding as of December 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025.

SEC source: 0001799091-24-000001 · primary_doc.xml · nonDerivative · entry 1

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,180.4636

F1 · price: These shares were sold in multiple transactions at the price of $26.05. 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.

SEC source: 0000950170-24-108766 · ownership.xml · derivative · entry 3

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,882.346

Underlying: Common Stock · 53.757 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.

F6 · shares: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.

F5 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of September 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

F5 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2024 and outstanding as of September 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025, March 31, 2026 and March 31, 2027.

F6 · derivative.underlying_shares: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.

F6 · balance_after: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.

SEC source: 0000950170-24-108766 · ownership.xml · derivative · entry 2

Kannan Molly D · CIK 0001799091 · CAO & Corporate Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,009.576

Underlying: Common Stock · 36.642 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.

F6 · shares: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.

F4 · derivative.exercise_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of September 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

F4 · derivative.expiration_date: The dividend equivalent rights accrued on restricted stock units that were granted on March 31, 2023 and outstanding as of September 19, 2024. These unvested restricted stock units, and the dividend equivalent rights related to such unvested restricted stock units, will vest on March 31, 2025 and March 31, 2026.

F6 · derivative.underlying_shares: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.

F6 · balance_after: The number of dividend equivalent rights reported on this Form 4 have been shown to the third decimal place. This reflects a change in the reporting methodology.