Iron Mountain Ownership | Who Owns Iron Mountain?

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Iron Mountain Ownership Summary

Iron Mountain is owned by 64.77% institutional investors, 0.98% insiders, and 34.25% retail investors. Vanguard group is the largest institutional shareholder, holding 15.87% of IRM shares. Vanguard Real Estate Index Investor is the top mutual fund, with 3.82% of its assets in Iron Mountain shares.

IRM Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Iron Mountain	64.77%	0.98%	34.25%
Sector	Real Estate Stocks	55.70%	8.24%	36.06%
Industry	Specialty REIT Stocks	63.59%	3.41%	33.00%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	46.61M	15.87%	$4.90B
Blackrock funding, inc. /de	32.07M	10.92%	$3.37B
Blackrock	27.89M	9.53%	$2.50B
State street	17.52M	5.98%	$1.58B
Cohen & steers	14.91M	5.08%	$1.57B
Geode capital management	7.91M	2.69%	$832.88M
Wealthfront advisers	6.86M	2.34%	$1.34B
Dimensional fund advisors lp	4.22M	1.44%	$443.48M
Capital world investors	3.82M	1.30%	$401.25M
Morgan stanley	3.66M	1.25%	$327.60M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Foresight capital management advisors	87.30K	5.36%	$9.18M
Vert asset management	129.27K	4.65%	$13.59M
Waterfront capital partners	237.85K	4.59%	$25.00M
Wealthfront advisers	6.86M	4.06%	$1.34B
Marble harbor investment counsel	346.57K	4.02%	$36.43M
Aew capital management l p	678.89K	3.45%	$71.36M
Werlinich asset management	51.69K	3.12%	$5.36M
Ar asset management	130.60K	3.11%	$13.73M
Adelante capital management	445.90K	3.09%	$46.87M
American trust investment advisors	70.40K	3.06%	$6.31M

Top Buyers

Holder	Shares	% Assets	Change
Wealthfront advisers	6.86M	4.06%	6.80M
Blackrock	27.89M	0.06%	4.78M
State street	17.52M	0.07%	3.70M
Norges bank	3.31M	0.05%	3.31M
Td asset management	1.95M	0.18%	1.09M

Top Sellers

Holder	Shares	% Assets	Change
Cohen & steers	14.91M	2.97%	-2.82M
Ubs asset management americas	426.22K	0.01%	-2.74M
Citadel advisors	-	-	-1.27M
Canada pension plan investment board	217.27K	0.02%	-851.84K
Wellington management group llp	1.55M	0.03%	-845.92K

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	3.31M	0.05%	3.31M	$348.25M
Raymond james financial	525.84K	0.02%	525.84K	$55.27M
Exoduspoint capital management, lp	186.50K	0.13%	186.50K	$19.60M
Qube research	136.33K	0.02%	136.33K	$14.33M
Caption management	136.20K	0.19%	136.20K	$12.21M

Sold Out

Holder	Change
Kozak & associates	-1.00
Financial gravity asset management	-1.00
Quest partners	-1.00
Mendota financial group	-1.00
Westend advisors	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2024	781	-27.82%	190,161,466	-20.39%	64	0.98%	327	-31.30%	315	-24.82%
Sep 30, 2024	1,072	8.83%	238,410,694	-3.76%	81	1.14%	475	9.20%	411	11.08%
Jun 30, 2024	970	1.04%	247,508,042	5.77%	84	1.32%	428	-1.15%	368	10.84%
Mar 31, 2024	960	5.61%	234,000,259	0.32%	79	1.25%	433	5.35%	332	-4.05%
Dec 31, 2023	909	7.57%	233,249,428	3.16%	79	1.33%	411	9.60%	346	11.61%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Real Estate Index Investor	11.22M	3.82%	-134.38K
Vanguard US Total Market Shares ETF	9.29M	3.16%	12.82K
Vanguard Total Stock Mkt Idx Inv	9.25M	3.15%	31.58K
Vanguard Institutional 500 Index Trust	8.14M	2.77%	54.73K
Vanguard Mid Cap Index Institutional	6.34M	2.16%	27.31K
Fidelity 500 Index	3.68M	1.25%	16.37K
iShares Core S&P 500 ETF	3.58M	1.22%	10.38K
SPDR® S&P 500 ETF	3.56M	1.21%	-144.37K
SPDR® S&P 500® ETF Trust	3.56M	1.21%	-18.68K
SPDR® S&P 500® ETF	3.52M	1.20%	-59.17K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Apr 01, 2025	Meaney William L	President and CEO	Sell	$2.06M
Apr 01, 2025	Meaney William L	President and CEO	Sell	$9.54K
Apr 01, 2025	Meaney William L	President and CEO	Sell	$894.03K
Apr 01, 2025	Meaney William L	President and CEO	Sell	$2.99M
Mar 04, 2025	Meaney William L	President and CEO	Sell	$8.85M

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	4
2025 Q1	-	21
2024 Q4	-	7
2024 Q3	-	13
2024 Q2	-	18

IRM Ownership FAQ

Who Owns Iron Mountain?

Iron Mountain shareholders are primarily institutional investors at 64.77%, followed by 0.98% insiders and 34.25% retail investors. The average institutional ownership in Iron Mountain's industry, Specialty REIT Stocks , is 63.59%, which Iron Mountain exceeds.

Who owns the most shares of Iron Mountain?

Iron Mountain’s largest shareholders are Vanguard group (46.61M shares, 15.87%), Blackrock funding, inc. /de (32.07M shares, 10.92%), and Blackrock (27.89M shares, 9.53%). Together, they hold 36.33% of Iron Mountain’s total shares outstanding.

Does Blackrock own Iron Mountain?

Yes, BlackRock owns 9.53% of Iron Mountain, totaling 27.89M shares as of Jun 2024. This represents 0.06% of BlackRock's total assets, with a market value of 2.5B$. In the last quarter, BlackRock increased its holdings by 4.78M shares, a 20.70% change.

Who is Iron Mountain’s biggest shareholder by percentage of total assets invested?

Foresight capital management advisors is Iron Mountain’s biggest shareholder by percentage of total assets invested, with 5.36% of its assets in 87.3K Iron Mountain shares, valued at 9.18M$.

Who is the top mutual fund holder of Iron Mountain shares?

Vanguard Real Estate Index Investor is the top mutual fund holder of Iron Mountain shares, with 3.82% of its total shares outstanding invested in 11.22M Iron Mountain shares.

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