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Ownership Document
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| Schema Version: X0508 |
| Document Type: 4 |
| Period of Report: 3/5/24 |
| Not Subject to Section 16: 0 |
| Issuer: |
| Issuer CIK: 1020569 |
| Issuer Name: IRON MOUNTAIN INC |
| Issuer Trading Symbol: IRM |
| Reporting Owner: |
| Reporting Owner ID: |
| | Owner CIK: 1691591 |
| | Owner Name: MARSON DEBORAH |
| Reporting Owner Address: |
| | Owner Street 1: C/O IRON MOUNTAIN INCORPORATED |
| | Owner Street 2: 85 NEW HAMPSHIRE AVENUE, SUITE 150 |
| | Owner City: PORTSMOUTH |
| | Owner State: NH |
| | Owner ZIP Code: 03801 |
| | Owner State Description: |
| Reporting Owner Relationship: |
| | Is Director? No |
| | Is Officer? Yes |
| | Is Ten Percent Owner? No |
| | Is Other? No |
| | Officer Title: EVP, General Counsel, Sec. |
| Aff 10b5 One: 1 |
| Non-Derivative Table: |
| Non-Derivative Transaction: |
| | Security Title: |
| | | Value: Common Stock, par value $.01 per share |
| | Transaction Date: |
| | | Value: 3/5/24 |
| | Transaction Coding: |
| | | Transaction Form Type: 4 |
| | | Transaction Code: S |
| | | Equity Swap Involved? No |
| | Transaction Amounts: |
| | | Transaction Shares: |
| Value: 2000 |
| | | Transaction Price Per Share: |
| Value: 78.70 |
| | | Transaction Acquired-Disposed Code: |
| Value: D |
| | Post-Transaction Amounts: |
| | | Shares Owned Following Transaction: |
| Value: 67,286 |
| | Ownership Nature: |
| | | Direct or Indirect Ownership: |
| Value: D |
| Derivative Table: |
| Footnotes: |
| Remarks: |
| Owner Signature: |
| Signature Name: /s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Deborah Marson |
| Signature Date: 3/6/24 |
