Meaney William L 4

4 · IRON MOUNTAIN INC · Filed Mar 3, 2026

Insider Transaction Report

Form 4

Period: 2026-03-01

IRON MOUNTAIN INCIRM

Meaney William L

DirectorPresident and CEO

Transactions

Exercise/Conversion
Common Stock, par value $.01 per share
[F1]
2026-03-01+650,674→ 650,674 total
Tax Payment
Common Stock, par value $.01 per share
[F2]
2026-03-01$108.33/sh−256,040$27,736,813→ 394,634 total
Sale
Common Stock, par value $.01 per share
[F3][F4]
2026-03-02$107.16/sh−2,929$313,872→ 391,705 total
Sale
Common Stock, par value $.01 per share
[F3][F5]
2026-03-02$108.27/sh−13,778$1,491,744→ 377,927 total
Sale
Common Stock, par value $.01 per share
[F3][F6]
2026-03-02$109.07/sh−37,296$4,067,875→ 340,631 total
Sale
Common Stock, par value $.01 per share
[F3][F7]
2026-03-02$110.05/sh−41,456$4,562,233→ 299,175 total
Sale
Common Stock, par value $.01 per share
[F3][F8]
2026-03-02$110.74/sh−3,200$354,368→ 295,975 total
Exercise/Conversion
Common Stock, par value $.01 per share
[F3]
2026-03-02$37.00/sh+38,474$1,423,538→ 334,449 total
Sale
Common Stock, par value $.01 per share
[F3][F9]
2026-03-02$107.95/sh−2,076$224,104→ 332,373 total
Sale
Common Stock, par value $.01 per share
[F3][F10]
2026-03-02$108.91/sh−16,457$1,792,332→ 315,916 total
Sale
Common Stock, par value $.01 per share
[F3][F11]
2026-03-02$110.02/sh−18,117$1,993,232→ 297,799 total
Sale
Common Stock, par value $.01 per share
[F3][F12]
2026-03-02$110.64/sh−1,824$201,807→ 295,975 total
Exercise/Conversion
Performance Units
[F13][F14]
2026-03-01−650,674→ 0 total
→ Common Stock, par value $.01 per share (650,674 underlying)
Award
Employee Stock Option (Right to Buy)
[F16][F15]
2026-03-01+74,069→ 74,069 total
Exercise: $108.33→ Common Stock, par value $.01 per share (74,069 underlying)
Exercise/Conversion
Employee Stock Option (Right to Buy)
[F3][F16][F17]
2026-03-02−38,474→ 346,266 total
Exercise: $37.00Exp: 2027-02-16→ Common Stock, par value $.01 per share (38,474 underlying)

Holdings

Common Stock, par value $.01 per share
(indirect: By Trust)
82,970
Common Stock, par value $.01 per share
(indirect: By Trust)
212,680

Footnotes (17)

[F1]This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on March 1, 2023. Effective February 16, 2026, the Compensation Committee of Iron Mountain Incorporated (the "Company")'s Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.
[F10]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $108.39 to $109.36, 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 (10).
[F11]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $109.40 to $110.40, 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 (11).
[F12]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $110.40 to $110.81, 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 (12).
[F13]Each PU represents a contingent right to receive one share of Common Stock.
[F14]The PUs were initially granted to the Reporting Person on March 1, 2023. Effective as of February 16, 2026, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.
[F15]This stock option becomes exercisable in three substantially equal annual installments beginning on the first anniversary of the date of grant.
[F16]Not applicable.
[F17]This stock option, initially representing a right to purchase a total of 461,696 shares, is fully vested.
[F2]Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the PUs and does not represent a sale.
[F3]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 shares of the Company common stock ("Common Stock") were sold in multiple transactions at prices ranging from $106.65 to $107.64, 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 shares of Common Stock were sold in multiple transactions at prices ranging from $107.67 to $108.66, 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 shares of Common Stock were sold in multiple transactions at prices ranging from $108.67 to $109.66, 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]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $109.68 to $110.58, 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 (7).
[F8]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $110.70 to $110.79, 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 (8).
[F9]The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $107.35 to $108.35, 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 (9).

Signature

/s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney|2026-03-03

Documents

3 files

4
wk-form4_1772584292.xmlPrimary
FORM 4
EX-24
poa_meaney.htm
EX-24
GRAPHIC
poa_meaney001.jpg
GRAPHIC