Extra Space Storage Inc.
MX ˙ BMV ˙ US30225T1025
SecurityMX:EXR / Extra Space Storage Inc.
InstitutionBoston Partners
Latest Disclosed Ownership967,407 shares
Latest Disclosed Value $ 126,863,771
Boston Partners reports 3.99% decrease in ownership of EXR / Extra Space Storage Inc.

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 967,407 shares of Extra Space Storage Inc. (MX:EXR) valued at $126,863,771 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,007,591 shares of Extra Space Storage Inc.. This represents a change in shares of -3.99% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F EXTRA SPACE STORAGE COM 30225T102 967,407 -40,184 -3.99 126,864 -3.33 0.0568
2026-02-13 2025-12-31 13F EXTRA SPACE STORAGE COM 30225T102 1,007,591 -18,585 -1.81 131,234 -9.26 0.1359
2025-11-13 2025-09-30 13F EXTRA SPACE STORAGE COM 30225T102 1,026,176 20,906 2.08 144,633 -2.40 0.1485
2025-08-12 2025-06-30 13F/A-1 EXTRA SPACE STORAGE COM 30225T102 1,005,270 -234,839 -18.94 148,194 -19.51 0.1646
2025-08-07 2025-06-30 13F EXTRA SPACE STORAGE COM 30225T102 1,005,270 -234,839 148,194 0.0680
2025-05-13 2025-03-31 13F EXTRA SPACE STORAGE COM 30225T102 1,240,109 -226,707 -15.46 184,123 -16.09 0.2227
2025-02-11 2024-12-31 13F EXTRA SPACE STORAGE COM 30225T102 1,466,816 82,104 5.93 219,437 -12.04 0.2669
2024-11-12 2024-09-30 13F EXTRA SPACE STORAGE COM 30225T102 1,384,712 -1,306,952 -48.56 249,463 -40.43 0.2944
2024-08-14 2024-06-30 13F EXTRA SPACE STORAGE COM 30225T102 2,691,664 1,803,325 203.00 418,754 220.75 0.5202
2024-05-28 2024-03-31 13F/A-1 EXTRA SPACE STORAGE COM 30225T102 888,339 888,339 130,554 0.1555
2024-05-13 2024-03-31 13F EXTRA SPACE STORAGE COM 30225T102 888,339 888,339 130,554 0.1555
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.