| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Font Juan | SVP, Pres. & CEO, CoreSite | 116 HUNTINGTON AVENUE, BOSTON | /s/ Marina A. Breed, as attorney-in-fact | 01 Aug 2025 | 0001733553 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | AMT | Common Stock | Sale | $149,998 | -720 | -3% | $208.33 | 23,425 | 31 Jul 2025 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Includes 41 shares acquired under the issuer's employee stock purchase plan in May 2025. |