William Blair & Company’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
Q2 | $28.3M | Sell |
224,376
-873
| -0.4% | -$107K | 0.07% | 206 |
|
|
2026
Q1 | $23M | Sell |
225,249
-13,036
| -5% | -$1.3M | 0.07% | 227 |
|
|
2025
Q4 | $19.8M | Sell |
238,285
-80,125
| -25% | -$7.5M | 0.05% | 237 |
|
|
2025
Q3 | $32.5M | Buy |
318,410
+4,280
| +1% | +$412K | 0.09% | 175 |
|
|
2025
Q2 | $32.2M | Sell |
314,130
-16,408
| -5% | -$1.55M | 0.09% | 175 |
|
|
2025
Q1 | $28.4M | Sell |
330,538
-3,984
| -1% | -$384K | 0.09% | 181 |
|
|
2024
Q4 | $35.2M | Buy |
334,522
+578
| +0.2% | +$67.9K | 0.1% | 171 |
|
|
2024
Q3 | $39.7M | Sell |
333,944
-14,202
| -4% | -$1.52M | 0.12% | 150 |
|
|
2024
Q2 | $31.2M | Sell |
348,146
-1,265
| -0.4% | -$102K | 0.1% | 160 |
|
|
2024
Q1 | $28M | Buy |
349,411
+10,326
| +3% | +$747K | 0.09% | 176 |
|
|
2023
Q4 | $23.7M | Sell |
339,085
-14,742
| -4% | -$925K | 0.08% | 188 |
|
|
2023
Q3 | $21M | Buy |
353,827
+1,176
| +0.3% | +$71.9K | 0.08% | 191 |
|
|
2023
Q2 | $20M | Sell |
352,651
-5,820
| -2% | -$319K | 0.07% | 204 |
|
|
2023
Q1 | $19M | Sell |
358,471
-3,090
| -0.9% | -$162K | 0.08% | 210 |
|
|
2022
Q4 | $18M | Buy |
361,561
+4,716
| +1% | +$238K | 0.08% | 207 |
|
|
2022
Q3 | $15.7M | Buy |
356,845
+82,162
| +30% | +$4.15M | 0.07% | 212 |
|
|
2022
Q2 | $13.4M | Sell |
274,683
-3,580
| -1% | -$188K | 0.06% | 247 |
|
|
2022
Q1 | $15.4M | Buy |
278,263
+7,865
| +3% | +$375K | 0.05% | 258 |
|
|
2021
Q4 | $14.2M | Buy |
270,398
+6,190
| +2% | +$293K | 0.04% | 283 |
|
|
2021
Q3 | $11.5M | Buy |
264,208
+8,989
| +4% | +$405K | 0.04% | 305 |
|
|
2021
Q2 | $10.8M | Sell |
255,219
-14,831
| -5% | -$622K | 0.04% | 312 |
|
|
2021
Q1 | $9.99M | Sell |
270,050
-62,431
| -19% | -$2.09M | 0.04% | 315 |
|
|
2020
Q4 | $9.8M | Buy |
332,481
+13,225
| +4% | +$367K | 0.04% | 309 |
|
|
2020
Q3 | $8.55M | Buy |
319,256
+43,370
| +16% | +$1.23M | 0.04% | 299 |
|
|
2020
Q2 | $7.2M | Sell |
275,886
-102,986
| -27% | -$2.6M | 0.03% | 312 |
|
|
2020
Q1 | $9.02M | Buy |
378,872
+6,525
| +2% | +$197K | 0.06% | 243 |
|
|
2019
Q4 | $11.9M | Sell |
372,347
-41,110
| -10% | -$1.35M | 0.06% | 244 |
|
|
2019
Q3 | $13.4M | Sell |
413,457
-2,644
| -0.6% | -$83K | 0.08% | 225 |
|
|
2019
Q2 | $13M | Sell |
416,101
-6,800
| -2% | -$223K | 0.07% | 224 |
|
|
2019
Q1 | $15M | Buy |
422,901
+33,118
| +8% | +$1.17M | 0.09% | 202 |
|
|
2018
Q4 | $12.6M | Buy |
389,783
+1,072
| +0.3% | +$35.2K | 0.09% | 205 |
|
|
2018
Q3 | $13.4M | Buy |
388,711
+14,668
| +4% | +$523K | 0.08% | 215 |
|
|
2018
Q2 | $13.1M | Sell |
374,043
-196,468
| -34% | -$6.64M | 0.09% | 208 |
|
|
2018
Q1 | $18.7M | Sell |
570,511
-293,856
| -34% | -$9.9M | 0.13% | 158 |
|
|
2017
Q4 | $32.6M | Buy |
864,367
+99,730
| +13% | +$3.96M | 0.22% | 113 |
|
|
2017
Q3 | $29.7M | Buy |
764,637
+6,158
| +0.8% | +$230K | 0.22% | 113 |
|
|
2017
Q2 | $26.1M | Buy |
758,479
+24,387
| +3% | +$853K | 0.2% | 126 |
|
|
2017
Q1 | $26.6M | Sell |
734,092
-10,545
| -1% | -$373K | 0.21% | 122 |
|
|
2016
Q4 | $24.2M | Sell |
744,637
-88,127
| -11% | -$2.93M | 0.22% | 118 |
|
|
2016
Q3 | $31.3M | Sell |
832,764
-63,026
| -7% | -$2.43M | 0.28% | 95 |
|
|
2016
Q2 | $35.7M | Sell |
895,790
-58,800
| -6% | -$2.14M | 0.33% | 84 |
|
|
2016
Q1 | $32.4M | Sell |
954,590
-68
| -0% | -$1.95K | 0.3% | 93 |
|
|
2015
Q4 | $25.8M | Buy |
954,658
+64,755
| +7% | +$1.9M | 0.24% | 112 |
|
|
2015
Q3 | $27.6M | Sell |
889,903
-33,835
| -4% | -$1.01M | 0.24% | 109 |
|
|
2015
Q2 | $28.6M | Buy |
923,738
+57,550
| +7% | +$2.02M | 0.04% | 479 |
|
|
2015
Q1 | $31.6M | Buy |
866,188
+24,132
| +3% | +$932K | 0.05% | 441 |
|
|
2014
Q4 | $32.6M | Buy |
842,056
+101,909
| +14% | +$3.71M | 0.05% | 443 |
|
|
2014
Q3 | $24.2M | Buy |
740,147
+185,462
| +33% | +$6.01M | 0.04% | 505 |
|
|
2014
Q2 | $18.2M | Sell |
554,685
-15,814
| -3% | -$429K | 0.03% | 601 |
|
|
2014
Q1 | $14.5M | Sell |
570,499
-21,555
| -4% | -$551K | 0.02% | 689 |
|
|
2013
Q4 | $16.6M | Buy |
592,054
+16,032
| +3% | +$411K | 0.03% | 602 |
|
|
2013
Q3 | $14.4M | Buy |
576,022
+24,450
| +4% | +$621K | 0.03% | 615 |
|
|
2013
Q2 | $13.6M | Buy |
+551,572
| New | +$17.8M | 0.03% | 597 |
|
Other funds holding IRM
William Blair & Company's IRM Position: Q2 2026 in Review
William Blair & Company reduced its Iron Mountain (IRM) stake by 0.39% in Q2 2026, selling an estimated $107K and leaving 224,376 shares worth $28.3M. The position accounts for 0.07% of the portfolio, ranked #206.
William Blair & Company first reported a position in IRM in Q2 2013 and has held it in 53 quarters since. The position peaked at $39.7M in Q3 2024. 1,171 funds tracked by Wall St. Rank hold IRM as of Q2 2026.
- William Blair & Company held 224,376 shares of Iron Mountain worth $28.3M as of Q2 2026.
- William Blair & Company sold 873 Iron Mountain shares in Q2 2026, an estimated $107K.
- Iron Mountain made up 0.07% of William Blair & Company's portfolio in Q2 2026, its #206 holding.
- William Blair & Company first reported a position in Iron Mountain in Q2 2013 and has held it in 53 quarters since.
- William Blair & Company's Iron Mountain position peaked at $39.7M in Q3 2024.
- 1,171 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.
Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.