| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Kelly Daniel S | VP, General Counsel and Sec. | 16100 SOUTH LATHROP AVENUE, HARVEY | /s/ Daniel S. Kelly | 2025-11-19 | 0001674314 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ATKR | Common Stock | Award | $0 | +6.19K | +22.93% | $0.00 | 33.2K | Nov 17, 2025 | Direct | F1, F2 |
| transaction | ATKR | Common Stock | Tax liability | -$44.5K | -683 | -2.06% | $65.10 | 32.5K | Nov 18, 2025 | Direct | F2, F3 |
| Id | Content |
|---|---|
| F1 | Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 17, 2025, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs. |
| F2 | Includes unvested restricted stock units ("RSUs") and amounts accrued for dividend equivalent units on such RSUs. |
| F3 | Securities withheld to pay withholding taxes on vested restricted stock units ("RSUs") exempt under Rule 16b-3. |