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Notice of Proposed Sale · 144

Iron Mountain Inc.

IRMNYSEEQUITYCurrent

Notice of Proposed Sale

Filed Oct 1, 2026Accepted Oct 1, 2026, 10:44 AM EDTFiling CIK 1566391Accession 0001959173-26-007170
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Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
IRON MOUNTAIN INC
Issuer CIK
0001020569
SEC file number
001-13045
Phone
617-535-4781
Person for whose account securities are to be sold
Meaney William L
Relationships to issuer
Officer · Director
Street
85 NEW HAMPSHIRE AVENUE, SUITE 150
Street (continued)
PEASE INTERNATIONAL TRADEPORT
City
PORTSMOUTH
State / country code
NH
Postal code
03801

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common38,4744,259,841.28297,702,81210/01/2026NYSEFidelity Brokerage Services LLC

Broker / market maker — proposed row 1, entry 1

Name
Fidelity Brokerage Services LLC
Street
900 Salem Street
City
Smithfield
State / country code
RI
Postal code
02917

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common10/01/2026Stock Option ExerciseIssuer38,474N10/01/2026Cash

Sales reported in the preceding three months

Sales reported in the preceding three months · 3 reported rows
SellerSecuritySale dateAmount soldGross proceeds
William L. MeaneyCommon07/01/202638,4744,725,826.83
William L. MeaneyCommon08/07/202638,4744,681,000.77
William L. MeaneyCommon09/01/202638,4744,389,017.74

Seller — prior-sale row 1, entry 1

Name
William L. Meaney
Street
85 New Hampshire Avenue, Suite 150
City
Portsmouth
State / country code
NH
Postal code
03801

Seller — prior-sale row 2, entry 1

Name
William L. Meaney
Street
85 New Hampshire Avenue
Street (continued)
Suite 150
City
Portsmouth
State / country code
NH
Postal code
03801

Seller — prior-sale row 3, entry 1

Name
William L. Meaney
Street
85 New Hampshire Avenue
Street (continued)
Suite 150
City
Portsmouth
State / country code
NH
Postal code
03801

Prior-sale reporting

Nothing to report for the preceding three months
N

Notice signature

Notice date
10/01/2026
Signed
/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William L. Meaney
Plan adoption dates
03/13/2025

Company context

Current securities

Recent company filings

  1. 4 filingSep 2, 2026
  2. 4 filingSep 2, 2026
  3. 144 filingSep 1, 2026
  4. 144 filingSep 1, 2026
  5. 144 filingSep 1, 2026

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