IRON MOUNTAIN INC·4

May 11, 4:39 PM ET

Allerton Jennifer 4

4 · IRON MOUNTAIN INC · Filed May 11, 2026

Research Summary

AI-generated summary of this filing

Updated

Iron Mountain (IRM) Director Jennifer Allerton Receives RSU Award

What Happened
Jennifer Allerton, a director of Iron Mountain Inc. (IRM), was granted 1,892 restricted stock units (RSUs) on May 7, 2026 that vested in full on the grant date (transaction code A). To cover income tax withholding on the net settlement, 133 shares were withheld at $126.81 each (transaction code F) for a withholding value of $16,866. Net shares issued to Allerton after withholding: 1,759. The RSUs had no cash exercise price (acquired at $0).

Key Details

  • Transaction date: May 7, 2026; Form 4 filed May 11, 2026 (filing date is within the typical two-business-day window).
  • Grant: 1,892 RSUs granted and vested (A) at $0 acquisition cost.
  • Tax withholding: 133 shares withheld (F) at $126.81/share = $16,866; withholding was done via share surrender (not an open-market sale).
  • Net shares delivered to insider: 1,759.
  • Shares owned after transaction: not disclosed in the filing.
  • Footnotes: F1 — RSUs vest in their entirety on grant date. F2 — Withheld shares satisfy income tax withholding and do not represent a sale.

Context
RSU grants that vest immediately are a form of compensation; the withholding of a portion of shares to satisfy taxes (a net settlement) is routine and should not be read as a market sale. This transaction represents compensation for the director rather than an open-market purchase or strategic sale.

Insider Transaction Report

Form 4
Period: 2026-05-07
Transactions
  • Award

    Common Stock, par value $.01 per share

    [F1]
    2026-05-07+1,89213,433 total
  • Tax Payment

    Common Stock, par value $.01 per share

    [F2]
    2026-05-07$126.81/sh133$16,86613,300 total
Footnotes (2)
  • [F1]Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date.
  • [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 RSUs and does not represent a sale.
Signature
/s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Jennifer Allerton|2026-05-11

Documents

3 files
  • 4
    wk-form4_1778531974.xmlPrimary

    FORM 4

  • EX-24
  • GRAPHIC
    poa-allerton001.jpg

    GRAPHIC