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
$10.1M Buy
98,400
+7,900
+9% +$786K ﹤0.01% 3247
2025
Q4
$7.51M Sell
90,500
-43,600
-33% -$4.08M ﹤0.01% 3657
2025
Q3
$13.7M Sell
134,100
-251,700
-65% -$24.2M ﹤0.01% 2807
2025
Q2
$39.6M Sell
385,800
-11,500
-3% -$1.08M 0.01% 1425
2025
Q1
$34.2M Buy
397,300
+283,600
+249% +$27.3M 0.01% 1472
2024
Q4
$12M Sell
113,700
-149,300
-57% -$17.5M ﹤0.01% 2755
2024
Q3
$31.3M Buy
263,000
+203,300
+341% +$21.7M 0.01% 1641
2024
Q2
$5.35M Sell
59,700
-23,200
-28% -$1.88M ﹤0.01% 3636
2024
Q1
$6.65M Sell
82,900
-111,400
-57% -$8.06M ﹤0.01% 3527
2023
Q4
$13.6M Sell
194,300
-50,500
-21% -$3.17M ﹤0.01% 2455
2023
Q3
$14.6M Sell
244,800
-7,100
-3% -$434K ﹤0.01% 2223
2023
Q2
$14.3M Buy
251,900
+7,400
+3% +$405K ﹤0.01% 2235
2023
Q1
$12.9M Sell
244,500
-8,400
-3% -$440K ﹤0.01% 2462
2022
Q4
$12.6M Buy
252,900
+73,300
+41% +$3.7M ﹤0.01% 2502
2022
Q3
$7.9M Sell
179,600
-69,800
-28% -$3.52M ﹤0.01% 3108
2022
Q2
$12.1M Buy
249,400
+183,500
+278% +$9.66M ﹤0.01% 2430
2022
Q1
$3.65M Sell
65,900
-76,600
-54% -$3.65M ﹤0.01% 4790
2021
Q4
$7.46M Buy
142,500
+800
+0.6% +$37.8K ﹤0.01% 3597
2021
Q3
$6.16M Sell
141,700
-65,300
-32% -$2.94M ﹤0.01% 3922
2021
Q2
$8.76M Sell
207,000
-126,100
-38% -$5.29M ﹤0.01% 3298
2021
Q1
$12.3M Buy
333,100
+23,600
+8% +$789K ﹤0.01% 2672
2020
Q4
$9.12M Buy
309,500
+158,600
+105% +$4.4M ﹤0.01% 2771
2020
Q3
$4.04M Buy
150,900
+27,200
+22% +$774K ﹤0.01% 3474
2020
Q2
$3.23M Sell
123,700
-19,500
-14% -$492K ﹤0.01% 3733
2020
Q1
$3.41M Sell
143,200
-89,200
-38% -$2.7M ﹤0.01% 3259
2019
Q4
$7.41M Sell
232,400
-34,800
-13% -$1.14M ﹤0.01% 2570
2019
Q3
$8.65M Sell
267,200
-49,300
-16% -$1.55M ﹤0.01% 2398
2019
Q2
$9.91M Buy
316,500
+143,400
+83% +$4.7M ﹤0.01% 2191
2019
Q1
$6.14M Buy
173,100
+62,700
+57% +$2.21M ﹤0.01% 2709
2018
Q4
$3.58M Buy
110,400
+57,800
+110% +$1.9M ﹤0.01% 3278
2018
Q3
$1.82M Sell
52,600
-22,300
-30% -$794K ﹤0.01% 4574
2018
Q2
$2.62M Buy
74,900
+18,700
+33% +$632K ﹤0.01% 3689
2018
Q1
$1.85M Sell
56,200
-28,400
-34% -$957K ﹤0.01% 3850
2017
Q4
$3.19M Buy
84,600
+77,900
+1,163% +$3.09M ﹤0.01% 3023
2017
Q3
$261K Buy
+6,700
New +$250K ﹤0.01% 6281
2017
Q2
Sell
-11,300
Closed -$403K 7762
2017
Q1
$403K Sell
11,300
-18,700
-62% -$662K ﹤0.01% 5390
2016
Q4
$974K Buy
30,000
+6,400
+27% +$213K ﹤0.01% 3886
2016
Q3
$886K Sell
23,600
-16,200
-41% -$625K ﹤0.01% 4002
2016
Q2
$1.58M Buy
39,800
+21,500
+117% +$783K ﹤0.01% 2982
2016
Q1
$621K Sell
18,300
-20,300
-53% -$583K ﹤0.01% 4100
2015
Q4
$1.04M Buy
38,600
+21,700
+128% +$636K ﹤0.01% 3510
2015
Q3
$524K Sell
16,900
-1,500
-8% -$44.8K ﹤0.01% 4750
2015
Q2
$570K Buy
18,400
+8,300
+82% +$291K ﹤0.01% 4759
2015
Q1
$368K Buy
10,100
+2,400
+31% +$92.7K ﹤0.01% 5367
2014
Q4
$298K Buy
7,700
+1,300
+20% +$47.3K ﹤0.01% 5438
2014
Q3
$209K Sell
6,400
-162,825
-96% -$5.28M ﹤0.01% 5678
2014
Q2
$5.54M Sell
169,225
-8,331
-5% -$226K 0.01% 1735
2014
Q1
$4.52M Buy
177,556
+87,750
+98% +$2.24M 0.01% 1875
2013
Q4
$2.52M Sell
89,806
-25,427
-22% -$651K ﹤0.01% 2323
2013
Q3
$2.88M Sell
115,233
-9,846
-8% -$250K ﹤0.01% 2059
2013
Q2
$3.08M Buy
+125,079
New +$4.04M 0.01% 2040

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.