Iron Mountain Inc

IRM

Exchange: NYSE
Industry: Real Estate Investment Trusts
SEC CIK: 0001020569

SEC filings (opens in a new tab)

In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 6 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B in total; no superinvestor holds it.

13F holders, Q1 2021

Institutional positions in Iron Mountain Inc as of Mar 31, 2021. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders: 630; No complete 13F data for Q4 2020
Shares held: 227.8M; No complete 13F data for Q4 2020
Total value: $8.44B; No complete 13F data for Q4 2020

Holders and value by quarter

Institutions reporting IRM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ1 2021: 630 institutions

Value heldQ1 2021: $8.44B

Institutions holding IRM and their total value by quarter
Quarter	Holders	Value
Q2 2026	1,173	$32.4B
Q1 2026	1,090	$25.9B
Q4 2025	1,011	$21.4B
Q3 2025	1,017	$25.5B
Q2 2025	1,045	$25.5B
Q1 2025	995	$21.1B
Q4 2024	1,067	$24.9B
Q3 2024	1,056	$28.8B
Q2 2024	967	$22.2B
Q1 2024	938	$19.0B
Q4 2023	891	$16.4B
Q3 2023	831	$13.7B
Q2 2023	817	$12.9B
Q1 2023	790	$12.0B
Q4 2022	782	$11.4B
Q3 2022	743	$10.0B
Q2 2022	767	$10.9B
Q1 2022	777	$12.4B
Q4 2021	754	$12.0B
Q3 2021	711	$9.94B
Q2 2021	687	$9.70B
Q1 2021	630	$8.44B

Institutions, Q1 2021

Shares, value and share of portfolio for each institution holding Iron Mountain Inc.

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.

Institutions holding IRM in Q1 2021
Institution	Shares	Value	% of portfolio	Change in shares	Action
Baird Financial Group, Inc.	53,996	$2.00M	0.01%	–	–
Measured Wealth Private Client Group, LLC	52,997	$1.96M	0.70%	–	–
MML Investors Services, LLC	52,926	$1.96M	0.02%	–	–
National Asset Management, Inc.	52,938	$1.96M	0.07%	–	–
Werlinich Asset Management, LLC	52,840	$1.96M	1.72%	–	–
Concorde Asset Management, LLC	52,657	$1.95M	1.12%	–	–
Mackay Shields LLC	52,334	$1.94M	0.01%	–	–
First Trust Advisors LP	50,603	$1.87M	0.00%	–	–
Burney Co	50,569	$1.87M	0.09%	–	–
Allianz Asset Management GmbH	49,525	$1.83M	0.00%	–	–
Amalgamated Bank	48,463	$1.79M	0.07%	–	–
Beck Capital Management, LLC	48,357	$1.79M	0.68%	–	–
Texas Permanent School Fund	48,161	$1.78M	0.02%	–	–
Northwest & Ethical Investments L.P.	47,574	$1.76M	0.06%	–	–
British Columbia Investment Management Corp	47,263	$1.75M	0.01%	–	–
Banco Bilbao Vizcaya Argentaria, S.A.	46,019	$1.70M	0.03%	–	–
Ingalls & Snyder LLC	45,968	$1.70M	0.08%	–	–
Virtus ETF Advisers LLC	45,955	$1.70M	0.72%	–	–
Searle & Co.	45,200	$1.67M	0.75%	–	–
AQR Capital Management LLC	44,666	$1.65M	0.00%	–	–
Vectors Research Management, LLC	44,250	$1.64M	0.45%	–	–
Pensionfund Sabic	44,000	$1.63M	0.38%	–	–
HNP Capital LLC	43,837	$1.62M	0.48%	–	–
Columbia Asset Management	43,594	$1.61M	0.29%	–	–
Shell Asset Management Co	43,139	$1.60M	0.03%	–	–
Bramshill Investments, LLC	42,439	$1.57M	0.10%	–	–
Hartford Investment Management Co	41,769	$1.55M	0.04%	–	–
Wealthfront Advisers LLC	41,706	$1.54M	0.01%	–	–
Eaton Vance Management	41,217	$1.52M	0.00%	–	–
Griffin Asset Management, Inc.	40,854	$1.51M	0.19%	–	–
Sculati Wealth Management, LLC	40,727	$1.51M	0.87%	–	–
Sippican Capital Advisors	40,452	$1.50M	1.38%	–	–
Tower Research Capital LLC (TRC)	40,148	$1.49M	0.02%	–	–
Gables Capital Management Inc.	40,095	$1.48M	0.82%	–	–
CoreFirst Bank & Trust	39,426	$1.46M	1.00%	–	–
Avenir Corp	39,130	$1.45M	0.13%	–	–
Schroder Investment Management Group	39,114	$1.45M	0.00%	–	–
Mathes Company, Inc.	38,950	$1.44M	0.56%	–	–
Sumitomo Mitsui DS Asset Management Company, Ltd	38,835	$1.44M	0.04%	–	–
Public Employees Retirement Association of Colorado	38,491	$1.43M	0.01%	–	–
Mercer Global Advisors Inc	38,342	$1.42M	0.01%	–	–
DekaBank Deutsche Girozentrale	38,089	$1.42M	0.00%	–	–
Fiduciary Planning LLC	37,715	$1.40M	2.11%	–	–
Mutual of America Capital Management LLC	37,327	$1.38M	0.01%	–	–
RFG Advisory, LLC	36,558	$1.35M	0.15%	–	–
DnB Asset Management AS	36,417	$1.35M	0.01%	–	–
AE Wealth Management LLC	36,144	$1.34M	0.01%	–	–
Commonwealth of Pennsylvania Public School Empls Retrmt Sys	36,072	$1.33M	0.02%	–	–
Bessemer Group Inc	35,387	$1.31M	0.00%	–	–
Alps Advisors Inc	35,152	$1.30M	0.01%	–	–
Pacitti Group Inc.	34,491	$1.28M	0.84%	–	–
Arkadios Wealth Advisors	34,353	$1.27M	0.21%	–	–
Meeder Asset Management Inc	34,260	$1.27M	0.06%	–	–
Thrivent Financial for Lutherans	33,739	$1.25M	0.00%	–	–
RB Capital Management, LLC	33,266	$1.23M	0.54%	–	–
IFM Investors Pty Ltd	33,255	$1.23M	0.03%	–	–
Ancora Advisors, LLC	33,213	$1.23M	0.03%	–	–
Donoghue Forlines LLC	33,175	$1.23M	0.24%	–	–
APG Asset Management N.V.	38,305	$1.21M	0.00%	–	–
Holderness Investments Co	32,355	$1.20M	0.43%	–	–
Banque Cantonale Vaudoise	32,284	$1.19M	0.06%	–	–
Teacher Retirement System of Texas	32,122	$1.19M	0.01%	–	–
Teamwork Financial Advisors, LLC	31,871	$1.18M	0.28%	–	–
Keeley-Teton Advisors, LLC	31,873	$1.18M	0.12%	–	–
Foster & Motley Inc	31,297	$1.16M	0.10%	–	–
Madison Asset Management, LLC	30,996	$1.15M	0.02%	–	–
Dumont & Blake Investment Advisors LLC	30,590	$1.13M	0.35%	–	–
D.A. Davidson & Co.	30,554	$1.13M	0.01%	–	–
Cerity Partners LLC	30,406	$1.13M	0.03%	–	–
NN Investment Partners Holdings N.V.	30,366	$1.12M	0.01%	–	–
DuPont Capital Management Corp	30,192	$1.12M	0.03%	–	–
Public Sector Pension Investment Board	29,942	$1.11M	0.01%	–	–
Richard P Slaughter Associates Inc	29,642	$1.10M	0.46%	–	–
Xponance, Inc.	29,602	$1.10M	0.02%	–	–
Hudson Portfolio Management LLC	29,475	$1.09M	1.05%	–	–
Franklin Resources Inc	29,247	$1.08M	0.00%	–	–
Federated Hermes, Inc.	28,912	$1.07M	0.00%	–	–
Norinchukin Bank, The	28,746	$1.06M	0.01%	–	–
Citadel Advisors LLC	28,558	$1.06M	0.00%	–	–
Fernwood Investment Management, LLC	28,562	$1.06M	0.39%	–	–
Capital Investment Advisory Services, LLC	28,362	$1.05M	0.15%	–	–
Cubic Asset Management, LLC	28,355	$1.05M	0.28%	–	–
CIBC World Markets Corp	27,499	$1.02M	0.01%	–	–
CIBC World Markets Inc.	27,398	$1.01M	0.00%	–	–
Redwood Investment Management, LLC	27,209	$1.01M	0.19%	–	–
Delphi Management Inc	26,759	$990.0K	1.05%	–	–
Horizon Kinetics Asset Management LLC	26,658	$987.0K	0.02%	–	–
Thompson Investment Management, Inc.	26,614	$985.0K	0.15%	–	–
Kinneret Advisory, LLC	25,708	$967.0K	0.12%	–	–
Eii Capital Management, Inc.	25,700	$951.0K	0.50%	–	–
CIBC Private Wealth Group, LLC	25,577	$947.0K	0.00%	–	–
KCM Investment Advisors LLC	25,440	$942.0K	0.04%	–	–
Telemus Capital, LLC	25,000	$939.0K	0.06%	–	–
Future Financial Wealth Managment LLC	25,208	$933.0K	1.07%	–	–
Candriam Luxembourg S.C.A.	32,821	$929.0K	0.01%	–	–
Wellington Management Group LLP	25,048	$927.0K	0.00%	–	–
Sumitomo Life Insurance Co	24,962	$924.0K	0.04%	–	–
Lavaca Capital LLC	24,926	$923.0K	0.53%	–	–
Monument Capital Management	24,895	$921.0K	0.37%	–	–
CIBC Asset Management Inc	24,515	$907.0K	0.00%	–	–