Private company
Who owns Storage Portfolio I LLC
One company in the researched set discloses a stake in Storage Portfolio I LLC, worth -$45m between them. Storage Portfolio I LLC is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
What this is
A private United States joint venture holding 24 self storage facilities that are branded and managed by Extra Space Storage for a fee, formed with the TIAA affiliate Teachers REA II LLC and recorded nowhere in public but the equity method table and joint venture note of Extra Space's own SEC filings.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Extra Space Storage Inc., as of 30 Jun 2026. 10-Q (period 30 Jun 2026): 24 stores, 34% equity ownership, 49% excess profit %, carrying value NEGATIVE $44,983 thousand at 30 Jun 2026 (negative $44,537 thousand at 31 Dec 2025). Stated in thousands in the filing; multiplied by 1,000 here. Negative balance is a real equity-method carrying value (distributions in excess of investment), not a market value. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Storage Portfolio I LLC where a holder stated one, and are missing where no holder did.