Extra Space Storage Inc.
US ˙ NYSE ˙ US30225T1025

SecurityEXR / Extra Space Storage Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership5,043 shares
Latest Disclosed Value $ 661,279
Assetmark, Inc reports 21.08% increase in ownership of EXR / Extra Space Storage Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 5,043 shares of Extra Space Storage Inc. (US:EXR) valued at $661,289 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 4,165 shares of Extra Space Storage Inc.. This represents a change in shares of 21.08% during the quarter. The current value of the position is $721,351 USD.

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)
2026-05-06 2026-03-31 13F EXTRA SPACE STORAGE COM 30225T102 5,043 878 21.08 661 21.96 0.0013
2026-01-23 2025-12-31 13F EXTRA SPACE STORAGE COM 30225T102 4,165 -365 -8.06 542 -15.05 0.0011
2025-11-06 2025-09-30 13F EXTRA SPACE STORAGE COM 30225T102 4,530 -2,782 -38.05 638 -40.82 0.0014
2025-08-04 2025-06-30 13F EXTRA SPACE STORAGE COM 30225T102 7,312 537 7.93 1,078 7.26 0.0025
2025-05-06 2025-03-31 13F EXTRA SPACE STORAGE COM 30225T102 6,775 447 7.06 1,006 6.24 0.0028
2025-02-06 2024-12-31 13F EXTRA SPACE STORAGE COM 30225T102 6,328 -85 -1.33 947 -18.10 0.0026
2024-11-01 2024-09-30 13F EXTRA SPACE STORAGE COM 30225T102 6,413 277 4.51 1,156 21.20 0.0033
2024-08-13 2024-06-30 13F EXTRA SPACE STORAGE COM 30225T102 6,136 -404,668 -98.51 954 -98.42 0.0029
2024-05-07 2024-03-31 13F EXTRA SPACE STORAGE COM 30225T102 410,804 247,929 152.22 60,388 131.26 0.1963
2024-02-09 2023-12-31 13F EXTRA SPACE STORAGE COM 30225T102 162,875 19,322 13.46 26,114 49.62 0.0944
2023-10-27 2023-09-30 13F EXTRA SPACE STORAGE COM 30225T102 143,553 -16,905 -10.54 17,453 -26.93 0.0698
2023-08-11 2023-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 160,458 -5,593 -3.37 23,884 -11.72 0.0937
2023-05-05 2023-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 166,051 -28,675 -14.73 27,055 -5.60 0.1118
2023-02-10 2022-12-31 13F EXTRA SPACE STORAGE COM 30225T102 194,726 -11,623 -5.63 28,660 -19.58 0.1242
2022-11-01 2022-09-30 13F EXTRA SPACE STORAGE COM 30225T102 206,349 1,588 0.78 35,638 2.31 0.1666
2022-08-03 2022-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 204,761 3,263 1.62 34,834 -15.92 0.1562
2022-05-13 2022-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 201,498 196,751 4,144.74 41,428 3,750.19 0.1734
2022-02-14 2021-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 4,747 303 6.82 1,076 44.04 0.0044
2021-11-12 2021-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 4,444 379 9.32 747 12.16 0.0033
2021-08-16 2021-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 4,065 309 8.23 666 33.73 0.0031
2021-05-14 2021-03-31 13F EXTRA SPACE STORAGE COM 30225T102 3,756 186 5.21 498 20.29 0.0026
2021-02-10 2020-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 3,570 171 5.03 414 13.74 0.0023
2020-11-13 2020-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 3,399 -69 -1.99 364 13.75 0.0023
2020-08-11 2020-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 3,468 41 1.20 320 -2.44 0.0023
2020-05-12 2020-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 3,427 322 10.37 328 0.00 0.0028
2020-02-11 2019-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 3,105 1,034 49.93 328 35.54 0.0025
2019-11-13 2019-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 2,071 328 18.82 242 30.81 0.0020
2019-08-14 2019-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,743 150 9.42 185 14.20 0.0015
2019-05-14 2019-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,593 161 11.24 162 24.62 0.0015
2019-02-13 2018-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,432 -70 -4.66 130 0.00 0.0013
2018-11-13 2018-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,502 268 21.72 130 5.69 0.0012
2018-08-01 2018-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,234 1,218 7,612.50 123 12,200.00 0.0012
2018-05-16 2018-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 16 -45 -73.77 1 -80.00 0.0000
2018-02-13 2017-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 61 30 96.77 5 150.00 0.0001
2017-11-08 2017-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 31 15 93.75 2 100.00 0.0000
2017-08-14 2017-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 16 -10 -38.46 1 -50.00 0.0000
2017-09-15 2017-03-31 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 26 0 0.00 2 0.00 0.0000
2017-05-08 2017-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 26 0 2
2017-09-15 2016-12-31 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 26 -1,147 -97.78 2 -97.85 0.0000
2017-02-14 2016-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 26 -1,147 2
2017-09-14 2016-09-30 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 1,173 -107,204 -98.92 93 -99.07 0.0014
2016-11-04 2016-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 1,173 -107,204 93
2017-09-14 2016-06-30 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 108,377 -1,451 -1.32 10,029 -2.30 0.1686
2016-08-08 2016-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 108,377 -1,451 10,029
2017-09-14 2016-03-31 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 109,828 2,525 2.35 10,265 8.45 0.1792
2016-05-13 2016-03-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 109,828 2,525 10,265
2017-09-14 2015-12-31 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 107,303 12,519 13.21 9,465 29.41 0.1754
2016-02-12 2015-12-31 13F EXTRA SPACE STORAGE INC COM COM 30225T102 107,303 12,519 9,465
2016-01-05 2015-09-30 13F/A-1 EXTRA SPACE STORAGE INC COM COM 30225T102 94,784 79,797 532.44 7,314 647.85 0.1526
2015-11-10 2015-09-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 94,784 7,314
2015-08-13 2015-06-30 13F EXTRA SPACE STORAGE INC COM COM 30225T102 14,987 14,987 978 0.0204
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.