Murray Stahl's IRM Position Overview
Murray Stahl (via Horizon Kinetics Asset Management LLC) currently holds 18,405 shares of Iron Mountain Incorporated (IRM) worth $1.88 M, representing 0.02% of the portfolio. First purchased in 2019-Q4, this long-term strategic position has been held for 26 quarters.
Based on 13F filings, Murray Stahl has maintained a strategic position in IRM, demonstrating sustained confidence in this investment. Largest addition occurred in Q3 2024, adding 10,350 shares. Largest reduction occurred in Q3 2025, reducing 13,000 shares.
Analysis based on 13F filings available since 2013 Q2
Murray Stahl's Iron Mountain Incorporated (IRM) Holding Value Over Time
Track share changes against reported price movement
Quarterly Iron Mountain Incorporated (IRM) Trades by Murray Stahl
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | -1,050 | Reduce 5.40% | 18,405 | $82.95 |
| Q3 2025 | -13,000 | Reduce 40.06% | 19,455 | $101.94 |
| Q1 2025 | -445 | Reduce 1.35% | 32,455 | $86.04 |
| Q4 2024 | -1,550 | Reduce 4.50% | 32,900 | $105.11 |
| Q3 2024 | +10,350 | Add 42.95% | 34,450 | $118.83 |
| Q2 2024 | -400 | Reduce 1.63% | 24,100 | $89.62 |
| Q1 2024 | -1,950 | Reduce 7.37% | 24,500 | $80.21 |
| Q4 2023 | -908 | Reduce 3.32% | 26,450 | $69.98 |
| Q1 2023 | -150 | Reduce 0.55% | 27,358 | $52.91 |
| Q3 2022 | -50 | Reduce 0.18% | 27,508 | $43.99 |
| Q2 2022 | -100 | Reduce 0.36% | 27,558 | $48.70 |
| Q1 2022 | +2,450 | Add 9.72% | 27,658 | $55.43 |
| Q4 2021 | +350 | Add 1.41% | 25,208 | $52.32 |
| Q3 2021 | -1,800 | Reduce 6.75% | 24,858 | $43.45 |
| Q1 2021 | +1,850 | Add 7.46% | 26,658 | $37.02 |
| Q4 2020 | +4,320 | Add 21.09% | 24,808 | $29.47 |
| Q3 2020 | +4,130 | Add 25.25% | 20,488 | $26.80 |
| Q2 2020 | -2,400 | Reduce 12.79% | 16,358 | $26.10 |
| Q1 2020 | +9,700 | Add 107.09% | 18,758 | $23.78 |
| Q4 2019 | +9,058 | New Buy | 9,058 | $31.91 |
Murray Stahl's Iron Mountain Incorporated Investment FAQs
Murray Stahl first purchased Iron Mountain Incorporated (IRM) in Q4 2019, acquiring 9,058 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Murray Stahl has held Iron Mountain Incorporated (IRM) for 26 quarters since Q4 2019.
Murray Stahl's largest addition to Iron Mountain Incorporated (IRM) was in Q3 2024, adding 34,450 shares worth $4.09 M.
According to the latest 13F filing for Q1 2026, Murray Stahl's firm, Horizon Kinetics Asset Management LLC, owns 18,405 shares of Iron Mountain Incorporated (IRM), valued at approximately $1.88 M.
As of the Q1 2026 filing, Iron Mountain Incorporated (IRM) represents approximately 0.02% of Murray Stahl's publicly disclosed stock portfolio, making it one of their key holdings.
Murray Stahl's peak holding in Iron Mountain Incorporated (IRM) was 34,450 shares, as reported at the end of Q3 2024.