Cohen & Steers’s Iron Mountain IRM Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | $1.65B | Sell |
16,169,341
-2,734,375
| -14% | -$272M | 2.87% | 8 |
|
|
2025
Q4 | $1.57B | Buy |
18,903,716
+3,155,034
| +20% | +$295M | 2.83% | 10 |
|
|
2025
Q3 | $1.61B | Buy |
15,748,682
+1,980,051
| +14% | +$191M | 2.9% | 10 |
|
|
2025
Q2 | $1.41B | Buy |
13,768,631
+286,729
| +2% | +$27M | 2.59% | 12 |
|
|
2025
Q1 | $1.16B | Sell |
13,481,902
-1,425,944
| -10% | -$137M | 2.14% | 14 |
|
|
2024
Q4 | $1.57B | Sell |
14,907,846
-2,818,166
| -16% | -$331M | 2.97% | 11 |
|
|
2024
Q3 | $2.11B | Sell |
17,726,012
-5,325,004
| -23% | -$570M | 3.75% | 9 |
|
|
2024
Q2 | $2.07B | Sell |
23,051,016
-604,022
| -3% | -$48.9M | 4.33% | 8 |
|
|
2024
Q1 | $1.9B | Buy |
23,655,038
+1,179,424
| +5% | +$85.4M | 3.97% | 9 |
|
|
2023
Q4 | $1.57B | Buy |
22,475,614
+15,035,937
| +202% | +$943M | 3.18% | 11 |
|
|
2023
Q3 | $442M | Sell |
7,439,677
-286,090
| -4% | -$17.5M | 1.02% | 22 |
|
|
2023
Q2 | $439M | Buy |
7,725,767
+4,798,010
| +164% | +$263M | 0.92% | 26 |
|
|
2023
Q1 | $155M | Buy |
2,927,757
+2,927,651
| +2,761,935% | +$153M | 0.33% | 41 |
|
|
2022
Q4 | $5K | Sell |
106
-693,554
| -100% | -$35M | ﹤0.01% | 400 |
|
|
2022
Q3 | $30.5M | Buy |
693,660
+693,499
| +430,745% | +$35M | 0.07% | 75 |
|
|
2022
Q2 | $8K | Sell |
161
-4,586
| -97% | -$241K | ﹤0.01% | 398 |
|
|
2022
Q1 | $263K | Sell |
4,747
-1,597
| -25% | -$76.1K | ﹤0.01% | 318 |
|
|
2021
Q4 | $332K | Buy |
+6,344
| New | +$300K | ﹤0.01% | 305 |
|
|
2021
Q3 | – | Sell |
-14,348
| Closed | -$607K | – | 405 |
|
|
2021
Q2 | $607K | Buy |
14,348
+490
| +4% | +$20.6K | ﹤0.01% | 267 |
|
|
2021
Q1 | $513K | Sell |
13,858
-566,223
| -98% | -$18.9M | ﹤0.01% | 276 |
|
|
2020
Q4 | $17.1M | Buy |
580,081
+43,661
| +8% | +$1.21M | 0.04% | 92 |
|
|
2020
Q3 | $14.4M | Sell |
536,420
-2,769,845
| -84% | -$78.8M | 0.04% | 80 |
|
|
2020
Q2 | $86.3M | Buy |
+3,306,265
| New | +$83.5M | 0.24% | 52 |
|
|
2019
Q3 | – | Sell |
-6,518,367
| Closed | -$204M | – | 412 |
|
|
2019
Q2 | $204M | Sell |
6,518,367
-2,352,730
| -27% | -$77.1M | 0.57% | 38 |
|
|
2019
Q1 | $315M | Sell |
8,871,097
-2,099,676
| -19% | -$74.2M | 0.87% | 32 |
|
|
2018
Q4 | $356M | Buy |
10,970,773
+4,456,942
| +68% | +$146M | 1.13% | 29 |
|
|
2018
Q3 | $225M | Buy |
6,513,831
+775,629
| +14% | +$27.6M | 0.65% | 40 |
|
|
2018
Q2 | $201M | Buy |
5,738,202
+3,773,693
| +192% | +$127M | 0.58% | 49 |
|
|
2018
Q1 | $64.6M | Buy |
+1,964,509
| New | +$66.2M | 0.2% | 77 |
|
Other funds holding IRM
VPM
VCM
Cohen & Steers's IRM Position: Q1 2026 in Review
Cohen & Steers reduced its Iron Mountain (IRM) stake by 14% in Q1 2026, selling an estimated $272M and leaving 16,169,341 shares worth $1.65B. The position accounts for 2.87% of the portfolio, ranked #8.
Cohen & Steers first reported a position in IRM in Q1 2018 and has held it in 29 quarters since. The position peaked at $2.11B in Q3 2024. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.
- Cohen & Steers held 16,169,341 shares of Iron Mountain worth $1.65B as of Q1 2026.
- Cohen & Steers sold 2,734,375 Iron Mountain shares in Q1 2026, an estimated $272M.
- Iron Mountain made up 2.87% of Cohen & Steers's portfolio in Q1 2026, its #8 holding.
- Cohen & Steers first reported a position in Iron Mountain in Q1 2018 and has held it in 29 quarters since.
- Cohen & Steers's Iron Mountain position peaked at $2.11B in Q3 2024.
- 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.
Based on Cohen & Steers's 13F filing for Q1 2026, filed 15 May 2026.