Who owns Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.

Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. - Profile

Mitsubishi UFJ Morgan Stanley Securities Co., Ltd. (MUMSS) is a Tokyo based securities firm created in May 2010 when Mitsubishi UFJ Financial Group and Morgan Stanley combined their Japanese securities businesses under the Global Strategic Alliance the two firms began in 2008. The joint venture operates as two companies: MUMSS and Morgan Stanley MUFG Securities (MSMS). MUMSS houses the integrated investment banking operation, advising Japanese corporate clients on mergers and acquisitions and underwriting equity and debt, and runs a large domestic retail brokerage and wealth management business distributing Japanese and international products through a nationwide branch network. Under the Alliance 2.0 arrangement announced in July 2023, the Japanese research and institutional equity businesses were consolidated into MSMS.

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