Security key
46284V101
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 257,162,908
- Total 13F value
- $21,344,532,604
- Share change
- +6,496,181
- Put/Call ratio
- 56%
- SEC-reported price per share
- $82.95
- Number of holders
- 1,003
- Value change
- +$502,933,470
- Number of buys
- 393
- Number of sells
- 517
- Shares outstanding
- 297,661,125
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
1,003
Top holders
10
IRM full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q1 2026
Previous quarter: Q3 2025
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
Clark H. Bailey
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
15/15
Latest evidence
30 Sep 2025
3/4/5
13F
Lead comparable stake: 0.09%
Showing 1-6 of 15 holder rows.
Quick read
Clark H. Bailey leads the comparable SEC ownership view at 0.09%.
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 Clark H. Bailey's linked filing trail.
Comparable ownership
Top 5
Clark H. Bailey
0.09%
VANGUARD GROUP INC
16%
BlackRock, Inc.
11%
STATE STREET CORP
5.8%
COHEN & STEERS, INC.
5.3%
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 |
|---|---|---|---|---|---|
| Clark H. Bailey |
3/4/5
Director
|
0.09%
|
$33,317,345
254,864 shares
mixed-class rows
|
— | 01 Jul 2025 |
| VANGUARD GROUP INC |
13F
Company
|
16%
|
$4,816,981,013
47,253,100 shares
|
— | 30 Sep 2025 |
| BlackRock, Inc. |
13F
Company
|
11%
|
$3,232,421,986
31,709,064 shares
|
— | 30 Sep 2025 |
| STATE STREET CORP |
13F
Company
|
5.8%
|
$1,759,494,141
17,131,787 shares
|
— | 30 Sep 2025 |
| COHEN & STEERS, INC. |
13F
Company
|
5.3%
|
$1,605,263,000
15,748,682 shares
|
— | 30 Sep 2025 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
2.8%
|
$831,727,030
8,190,580 shares
|
— | 30 Sep 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 Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
1,003
Shares
257,162,908
Rows available
1,003
| 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 Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
1,008
Q4 2025 holders
1,003
Holder diff
-5
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend