Vanguard Group’s Iron Mountain IRM Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2025
Q4
$3.87B Sell
46,627,483
-625,617
-1% -$58.6M 0.06% 315
2025
Q3
$4.82B Buy
47,253,100
+188,213
+0.4% +$18.1M 0.07% 268
2025
Q2
$4.83B Buy
47,064,887
+239,153
+0.5% +$22.5M 0.08% 254
2025
Q1
$4.03B Buy
46,825,734
+220,564
+0.5% +$21.3M 0.07% 270
2024
Q4
$4.9B Buy
46,605,170
+1,332
+0% +$157K 0.09% 216
2024
Q3
$5.54B Sell
46,603,838
-39,514
-0.1% -$4.23M 0.1% 178
2024
Q2
$4.18B Buy
46,643,352
+266,118
+0.6% +$21.5M 0.08% 241
2024
Q1
$3.72B Buy
46,377,234
+102,124
+0.2% +$7.39M 0.07% 276
2023
Q4
$3.24B Sell
46,275,110
-337,656
-0.7% -$21.2M 0.07% 292
2023
Q3
$2.77B Sell
46,612,766
-241,020
-0.5% -$14.7M 0.07% 299
2023
Q2
$2.66B Sell
46,853,786
-812,878
-2% -$44.5M 0.06% 330
2023
Q1
$2.52B Buy
47,666,664
+236,740
+0.5% +$12.4M 0.06% 330
2022
Q4
$2.36B Sell
47,429,924
-16,945
-0% -$855K 0.06% 338
2022
Q3
$2.09B Sell
47,446,869
-235,842
-0.5% -$11.9M 0.06% 347
2022
Q2
$2.32B Sell
47,682,711
-653,003
-1% -$34.4M 0.07% 316
2022
Q1
$2.68B Sell
48,335,714
-96,443
-0.2% -$4.59M 0.06% 325
2021
Q4
$2.53B Sell
48,432,157
-201,911
-0.4% -$9.54M 0.06% 361
2021
Q3
$2.11B Buy
48,634,068
+129,949
+0.3% +$5.85M 0.05% 402
2021
Q2
$2.05B Sell
48,504,119
-118,109
-0.2% -$4.95M 0.05% 408
2021
Q1
$1.8B Buy
48,622,228
+258,839
+0.5% +$8.65M 0.05% 422
2020
Q4
$1.43B Sell
48,363,389
-115,131
-0.2% -$3.19M 0.04% 471
2020
Q3
$1.3B Sell
48,478,520
-351,803
-0.7% -$10M 0.04% 436
2020
Q2
$1.27B Buy
48,830,323
+115,858
+0.2% +$2.93M 0.05% 417
2020
Q1
$1.16B Buy
48,714,465
+1,118,899
+2% +$33.9M 0.05% 397
2019
Q4
$1.52B Buy
47,595,566
+978,112
+2% +$32.1M 0.05% 410
2019
Q3
$1.51B Buy
46,617,454
+883,488
+2% +$27.8M 0.06% 379
2019
Q2
$1.43B Buy
45,733,966
+1,111,513
+2% +$36.4M 0.05% 394
2019
Q1
$1.58B Buy
44,622,453
+747,276
+2% +$26.4M 0.06% 343
2018
Q4
$1.42B Sell
43,875,177
-26,671
-0.1% -$875K 0.06% 336
2018
Q3
$1.52B Buy
43,901,848
+138,607
+0.3% +$4.94M 0.06% 370
2018
Q2
$1.53B Sell
43,763,241
-1,097,049
-2% -$37.1M 0.06% 349
2018
Q1
$1.47B Sell
44,860,290
-2,829,168
-6% -$95.3M 0.06% 353
2017
Q4
$1.8B Buy
47,689,458
+3,358,291
+8% +$133M 0.08% 271
2017
Q3
$1.72B Buy
44,331,167
+932,457
+2% +$34.8M 0.08% 270
2017
Q2
$1.49B Buy
43,398,710
+151,039
+0.3% +$5.28M 0.07% 303
2017
Q1
$1.54B Buy
43,247,671
+893,442
+2% +$31.6M 0.08% 284
2016
Q4
$1.38B Buy
42,354,229
+306,559
+0.7% +$10.2M 0.08% 289
2016
Q3
$1.58B Buy
42,047,670
+3,934,973
+10% +$152M 0.09% 232
2016
Q2
$1.52B Buy
38,112,697
+6,510,415
+21% +$237M 0.09% 231
2016
Q1
$1.07B Buy
31,602,282
+808,473
+3% +$23.2M 0.07% 316
2015
Q4
$832M Buy
30,793,809
+1,515,161
+5% +$44.4M 0.06% 385
2015
Q3
$908M Sell
29,278,648
-10,397
-0% -$310K 0.07% 327
2015
Q2
$908M Buy
29,289,045
+1,228,593
+4% +$43M 0.06% 361
2015
Q1
$1.02B Buy
28,060,452
+1,793,282
+7% +$69.2M 0.07% 315
2014
Q4
$1.02B Buy
26,267,170
+13,458,422
+105% +$490M 0.07% 295
2014
Q3
$418M Sell
12,808,748
-572,222
-4% -$18.6M 0.03% 577
2014
Q2
$438M Buy
13,380,970
+381,333
+3% +$10.3M 0.03% 569
2014
Q1
$331M Buy
12,999,637
+429,216
+3% +$11M 0.03% 670
2013
Q4
$353M Buy
12,570,421
+227,169
+2% +$5.82M 0.03% 601
2013
Q3
$308M Buy
12,343,252
+337,297
+3% +$8.57M 0.03% 622
2013
Q2
$295M Buy
+12,005,955
New +$387M 0.03% 597

Other funds holding IRM

Vanguard Group's IRM Position: Q4 2025 in Review

Vanguard Group reduced its Iron Mountain (IRM) stake by 1.3% in Q4 2025, selling an estimated $58.6M and leaving 46,627,483 shares worth $3.87B. The position accounts for 0.06% of the portfolio, ranked #315.

Vanguard Group first reported a position in IRM in Q2 2013 and has held it in 51 quarters since. The position peaked at $5.54B in Q3 2024. 1,006 funds tracked by Wall St. Rank hold IRM as of Q4 2025.

  • Vanguard Group held 46,627,483 shares of Iron Mountain worth $3.87B as of Q4 2025.
  • Vanguard Group sold 625,617 Iron Mountain shares in Q4 2025, an estimated $58.6M.
  • Iron Mountain made up 0.06% of Vanguard Group's portfolio in Q4 2025, its #315 holding.
  • Vanguard Group first reported a position in Iron Mountain in Q2 2013 and has held it in 51 quarters since.
  • Vanguard Group's Iron Mountain position peaked at $5.54B in Q3 2024.
  • 1,006 funds tracked by Wall St. Rank held Iron Mountain as of Q4 2025.

Based on Vanguard Group's 13F filing for Q4 2025, filed 29 Jan 2026.