Security key
46284V101
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 518,752
- Total 13F value
- $57,531,213
- Share change
- -47,916
- SEC-reported price per share
- $110.95
- Number of holders
- 44
- Value change
- -$5,309,121
- Number of buys
- 22
- Number of sells
- 14
- Shares outstanding
- 297,661,125
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2026
Institutions
44
Top holders
10
IRM full security history
Ownership snapshot
Full 13F holder table
IRON MOUNTAIN INC SEC filings
IRON MOUNTAIN INC company facts
Broader feeds
Reporting periods
Holder history for CUSIP 46284V101
Recent filing periods:
Ownership snapshot
Top reported holders of IRM - IRON MOUNTAIN INC - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VANGUARD PORTFOLIO MANAGE...
Disclosed value leader
BlackRock, Inc.
Comparable rows
15/15
Latest evidence
01 Sep 2026
13F
13D/G
3/4/5
Lead comparable stake: 8.4%
13D/G row: VANGUARD PORTFOLIO MANAGEMENT LLC
Showing 1-6 of 15 holder rows.
Quick read
VANGUARD PORTFOLIO MANAGEMENT LLC leads the comparable SEC ownership view at 8.4%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VANGUARD PORTFOLIO MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 5
VANGUARD PORTFOLIO MANAGEMENT LLC
8.4%
VANGUARD CAPITAL MANAGEMENT LLC
7.4%
COHEN & STEERS, INC.
4.9%
Kent P. Dauten
0.41%
Barry A. Hytinen
0.11%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
8.4%
from 13D/G
|
$3,229,613,316
25,568,944 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Capital Management
|
7.4%
from 13D/G
|
$2,394,042,478
18,953,705 shares
|
— | 30 Jun 2026 |
| COHEN & STEERS, INC. |
13F
13D/G
Company
|
4.9%
from 13D/G
|
$1,518,214,000
12,019,735 shares
|
— | 30 Jun 2026 |
| Kent P. Dauten |
3/4/5
Director
|
0.41%
|
$123,545,786
1,209,573 shares
|
— | 07 May 2026 |
| Barry A. Hytinen |
3/4/5
EVP and CFO
|
0.11%
|
$35,383,069
326,623 shares
|
— | 01 Mar 2026 |
| Clark H. Bailey |
3/4/5
Director
|
0.09%
|
$33,317,345
254,864 shares
mixed-class rows
|
— | 01 Jul 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
44
Shares
518,752
Rows available
44
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2026 vs Q2 2026 Across Filers
Q2 2026 holders
1,172
Q3 2026 holders
44
Holder diff
-1,128
| Investor | Q2 2026 Shares | Q3 2026 Shares | Share Diff | Share Chg % | Q2 2026 value | Q3 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend