Citadel Advisors’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
$21.1M Buy
206,200
+28,300
+16% +$2.82M ﹤0.01% 2278
2025
Q4
$14.8M Buy
177,900
+42,900
+32% +$4.02M ﹤0.01% 2724
2025
Q3
$13.8M Sell
135,000
-31,500
-19% -$3.03M ﹤0.01% 2797
2025
Q2
$17.1M Sell
166,500
-278,200
-63% -$26.2M ﹤0.01% 2334
2025
Q1
$38.3M Buy
444,700
+242,400
+120% +$23.4M 0.01% 1380
2024
Q4
$21.3M Sell
202,300
-202,500
-50% -$23.8M ﹤0.01% 2099
2024
Q3
$48.1M Buy
404,800
+55,600
+16% +$5.95M 0.01% 1247
2024
Q2
$31.3M Buy
349,200
+111,200
+47% +$9M 0.01% 1569
2024
Q1
$19.1M Buy
238,000
+6,100
+3% +$442K ﹤0.01% 2115
2023
Q4
$16.2M Sell
231,900
-61,600
-21% -$3.86M ﹤0.01% 2246
2023
Q3
$17.4M Buy
293,500
+6,300
+2% +$385K ﹤0.01% 2008
2023
Q2
$16.3M Sell
287,200
-68,200
-19% -$3.73M ﹤0.01% 2093
2023
Q1
$18.8M Sell
355,400
-9,600
-3% -$503K ﹤0.01% 1984
2022
Q4
$18.2M Buy
365,000
+36,900
+11% +$1.86M ﹤0.01% 2067
2022
Q3
$14.4M Buy
328,100
+11,200
+4% +$566K ﹤0.01% 2265
2022
Q2
$15.4M Buy
316,900
+14,200
+5% +$747K ﹤0.01% 2130
2022
Q1
$16.8M Buy
302,700
+96,200
+47% +$4.58M ﹤0.01% 2206
2021
Q4
$10.8M Buy
206,500
+17,300
+9% +$818K ﹤0.01% 2946
2021
Q3
$8.22M Sell
189,200
-98,000
-34% -$4.41M ﹤0.01% 3413
2021
Q2
$12.2M Sell
287,200
-113,200
-28% -$4.75M ﹤0.01% 2783
2021
Q1
$14.8M Sell
400,400
-278,900
-41% -$9.32M ﹤0.01% 2383
2020
Q4
$20M Sell
679,300
-43,800
-6% -$1.22M 0.01% 1805
2020
Q3
$19.4M Sell
723,100
-130,900
-15% -$3.72M 0.01% 1607
2020
Q2
$22.3M Buy
854,000
+397,300
+87% +$10M 0.01% 1421
2020
Q1
$10.9M Sell
456,700
-62,500
-12% -$1.89M ﹤0.01% 1766
2019
Q4
$16.5M Sell
519,200
-413,700
-44% -$13.6M 0.01% 1667
2019
Q3
$30.2M Buy
932,900
+482,400
+107% +$15.2M 0.01% 1119
2019
Q2
$14.1M Buy
450,500
+41,200
+10% +$1.35M 0.01% 1764
2019
Q1
$14.5M Buy
409,300
+249,500
+156% +$8.81M 0.01% 1639
2018
Q4
$5.18M Buy
159,800
+34,200
+27% +$1.12M ﹤0.01% 2731
2018
Q3
$4.34M Buy
125,600
+18,400
+17% +$655K ﹤0.01% 3178
2018
Q2
$3.75M Buy
107,200
+50,500
+89% +$1.71M ﹤0.01% 3160
2018
Q1
$1.86M Buy
56,700
+28,000
+98% +$944K ﹤0.01% 3839
2017
Q4
$1.08M Sell
28,700
-2,900
-9% -$115K ﹤0.01% 4550
2017
Q3
$1.23M Sell
31,600
-10,500
-25% -$392K ﹤0.01% 4022
2017
Q2
$1.45M Buy
42,100
+23,500
+126% +$822K ﹤0.01% 3582
2017
Q1
$663K Sell
18,600
-1,100
-6% -$38.9K ﹤0.01% 4589
2016
Q4
$640K Sell
19,700
-14,100
-42% -$469K ﹤0.01% 4525
2016
Q3
$1.27M Buy
33,800
+4,400
+15% +$170K ﹤0.01% 3522
2016
Q2
$1.17M Sell
29,400
-12,000
-29% -$437K ﹤0.01% 3380
2016
Q1
$1.4M Buy
41,400
+4,200
+11% +$121K ﹤0.01% 3067
2015
Q4
$1M Buy
37,200
+800
+2% +$23.5K ﹤0.01% 3557
2015
Q3
$1.13M Buy
36,400
+16,800
+86% +$501K ﹤0.01% 3650
2015
Q2
$608K Buy
19,600
+4,900
+33% +$172K ﹤0.01% 4676
2015
Q1
$536K Sell
14,700
-45,300
-76% -$1.75M ﹤0.01% 4791
2014
Q4
$2.32M Buy
60,000
+58,900
+5,355% +$2.14M ﹤0.01% 2739
2014
Q3
$36K Sell
1,100
-128,632
-99% -$4.17M ﹤0.01% 7107
2014
Q2
$4.25M Buy
129,732
+4,977
+4% +$135K ﹤0.01% 1985
2014
Q1
$3.18M Buy
124,755
+46,526
+59% +$1.19M ﹤0.01% 2173
2013
Q4
$2.19M Sell
78,229
-103,331
-57% -$2.65M ﹤0.01% 2458
2013
Q3
$4.53M Buy
181,560
+118,371
+187% +$3.01M 0.01% 1651
2013
Q2
$1.55M Buy
+63,189
New +$2.04M ﹤0.01% 2725

Other funds holding IRM

Citadel Advisors's IRM Position: Q1 2026 in Review

Citadel Advisors reduced its Iron Mountain (IRM) stake by 67% in Q1 2026, selling an estimated $74.1M and leaving 374,954 shares worth $38.3M. The position accounts for 0.01% of the portfolio, ranked #1605.

Citadel Advisors first reported a position in IRM in Q2 2013 and has held it in 47 quarters since. The position peaked at $139M in Q4 2023. 1,084 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Citadel Advisors held 374,954 shares of Iron Mountain worth $38.3M as of Q1 2026.
  • Citadel Advisors sold 744,417 Iron Mountain shares in Q1 2026, an estimated $74.1M.
  • Iron Mountain made up 0.01% of Citadel Advisors's portfolio in Q1 2026, its #1605 holding.
  • Citadel Advisors first reported a position in Iron Mountain in Q2 2013 and has held it in 47 quarters since.
  • Citadel Advisors's Iron Mountain position peaked at $139M in Q4 2023.
  • 1,084 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.