Iron Mountain shares owned by Thompson, Siegel, & Walmsley
Quarter-by-quarter ownership of Iron Mountain (IRM) shares owned by Thompson, Siegel, & Walmsley
from 13F filings
Historical chart of Thompson, Siegel, & Walmsley investment in Iron Mountain
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Quarterly reported holdings in Iron Mountain by Thompson, Siegel, & Walmsley
| Quarter filed | Position value | Share count | Share price at filing |
|---|---|---|---|
| 2025-09-30 | $8.8M | 86k | 101.94 |
| 2025-06-30 | $6.8M | 66k | 102.57 |
| 2020-03-31 | $0 | 1 | 0.00 |
| 2019-12-31 | $0 | 1 | 0.00 |
| 2019-09-30 | $13k | 401 | 32.42 |
| 2019-06-30 | $13k | 404 | 32.18 |
| 2019-03-31 | $53k | 1.5k | 35.62 |
| 2018-12-31 | $46M | 2.0M | 23.26 |
| 2018-09-30 | $57M | 1.9M | 30.30 |
| 2018-06-30 | $54M | 1.8M | 30.30 |
| 2018-03-31 | $59M | 1.5M | 40.00 |
| 2017-12-31 | $53M | 847k | 62.50 |
| 2017-09-30 | $59M | 950k | 62.50 |
| 2017-06-30 | $25M | 714k | 34.36 |
| 2017-03-31 | $21M | 577k | 35.67 |
| 2016-12-31 | $24M | 729k | 32.48 |
| 2016-09-30 | $26M | 687k | 37.53 |
| 2016-06-30 | $24M | 595k | 39.83 |
| 2016-03-31 | $26M | 756k | 33.91 |
| 2015-12-31 | $21M | 760k | 27.01 |
| 2015-09-30 | $20M | 632k | 31.02 |
| 2015-06-30 | $19M | 608k | 31.00 |
| 2015-03-31 | $27M | 748k | 36.48 |
More positions owned by Thompson, Siegel, & Walmsley
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