Private company
Who owns Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.
One company in the researched set discloses a stake in Mitsubishi UFJ Morgan Stanley Securities Co., Ltd., worth $1.29bn between them. Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. 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.
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.
- Morgan Stanley, as of 31 Dec 2025. The 40% economic and voting interest is filed and stated directly: the FY2025 10-K says the Firm and MUFG formed a Japan joint venture comprising two companies, MUMSS and Morgan Stanley MUFG Securities Co., Ltd. (MSMS): the Firm owns a 40% economic interest in the Joint Venture and MUFG owns the other 60%, and the Firm's 40% voting interest in MUMSS is accounted for under the equity method within Institutional Securities. MSMS is separately consolidated by the Firm based on its 51% voting interest and so is not treated as part of this position (majority-owned and consolidated, not a minority stake). The $1,290 million value_usd is NOT filed; it is inferred. The same FY2025 10-K's market-risk sensitivity table 'Investments Sensitivity, Including Related Carried Interest, Loss from 10% Decline' shows 'Other investments: MUMSS' at $129 million at 31 December 2025 (versus $122 million at 31 December 2024), separately broken out from an unnamed 'Other Firm investments' bucket ($493 million) that is not attributed to this or any other single investee. Assumed input: the sensitivity is described as the loss from a 10% decline in investment value, so treating it as linear implies a carrying value of $129m / 0.10 = approximately $1,290 million (roughly $1.16bn to $1.42bn if the true relationship is only approximately linear, i.e. plus or minus 10%). This is an inference from a sensitivity disclosure, not a carrying value the filing states directly, so basis is modelled and confidence is estimated even though the 40% interest itself is filed fact. 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 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. where a holder stated one, and are missing where no holder did.