| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Waltz William E Jr. | President and CEO, Director | 16100 SOUTH LATHROP AVENUE, HARVEY | /s/ Daniel S. Kelly, Attorney-in-Fact for William E. Waltz, Jr. | 2025-11-19 | 0001674332 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | ATKR | Common Stock | Award | $0 | +40.8K | +41.06% | $0.00 | 140K | Nov 17, 2025 | Direct | F1, F2 |
| transaction | ATKR | Common Stock | Tax liability | -$315K | -4.83K | -3.44% | $65.10 | 135K | Nov 18, 2025 | Direct | F2, F3 |
| holding | ATKR | Common Stock | 23.8K | Nov 17, 2025 | By Trust | F4 |
| 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. |
| F4 | Securities held directly by a trust for which the reporting person's spouse is the beneficiary. The reporting person disclaims beneficial ownership of these securities, except to the extent of his pecuniary interest therein, and this report shall not be deemed to be an admission that the reporting person is, for purposes of Section 16 or any other purpose, the beneficial owner of such securities. |