=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-06-01
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
--- Reporting Owner ---
Name: Meaney William L
CIK: 0001566391
Role: Director, Officer (President and CEO)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: M (Exercise of derivative)
Shares: +38,474 | Price: $37.00
Total Value: $1,423,538.00
Shares Owned After: 38,474 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[Transaction #2]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -10,156 | Price: $126.20
Total Value: $1,281,687.20
Shares Owned After: 28,318 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F2] The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $125.49 to $126.48, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).
[Transaction #3]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -10,457 | Price: $127.00
Total Value: $1,328,039.00
Shares Owned After: 17,861 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F3] The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $126.50 to $127.48, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (3).
[Transaction #4]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -7,523 | Price: $127.90
Total Value: $962,191.70
Shares Owned After: 10,338 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F4] The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $127.50 to $128.48, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (4).
[Transaction #5]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -9,247 | Price: $129.14
Total Value: $1,194,157.58
Shares Owned After: 1,091 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F5] The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $128.55 to $129.54, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (5).
[Transaction #6]
Security: Common Stock, par value $.01 per share
Date: 2026-06-01 | Code: S (Open market sale)
Shares: -1,091 | Price: $129.66
Total Value: $141,459.06
Shares Owned After: 0 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F6] The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $129.55 to $129.78, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (6).
--- Derivative Transactions ---
[Transaction #1]
Security: Employee Stock Option (Right to Buy)
Date: 2026-06-01 | Code: M (Exercise of derivative)
Shares: -38,474
Exercisable: N/A | Expires: 2027-02-16
Shares Owned After: 230,844 | Ownership: D (Direct)
Footnotes:
[F1] The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
[F8] Not applicable.
[F7] This stock option, initially representing a right to purchase a total of 461,696 shares, is fully vested.
--- Holdings ---
[Holding #1]
Security: Common Stock, par value $.01 per share
Ownership: I (Indirect)
[Holding #2]
Security: Common Stock, par value $.01 per share
Ownership: I (Indirect)
--- Footnotes (Complete Index) ---
F1: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
F2: The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $125.49 to $126.48, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).
F3: The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $126.50 to $127.48, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (3).
F4: The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $127.50 to $128.48, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (4).
F5: The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $128.55 to $129.54, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (5).
F6: The price reported in Column 4 is a weighted average price. These Common Stock were sold in multiple transactions at prices ranging from $129.55 to $129.78, inclusive. The Reporting Person
undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (6).
F7: This stock option, initially representing a right to purchase a total of 461,696 shares, is fully vested.
F8: Not applicable.
--- Signature ---
/s/ /s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney (2026-06-02)
