Monex Group (マネックスグループ)

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This entry sits under securities-firms INDEX. Read it against Nomura Holdings (Nomura HD) for peer / contrast context and securities index for the broader system / regulatory boundary.

TL;DR

A holding company that bundles a major Japanese online brokerage + crypto assets (Coincheck) + a U.S. online broker (TradeStation) into a global retail-investor financial platform (TSE PRIME 8698). Founded in 1999-05-19 (the former Monex, Inc., jointly invested by Sony + Oki Matsumoto), with founder Oki Matsumoto (a former Goldman Sachs partner, now Chairman and CEO) still at the helm. Characterized by a 3 -axis structure of domestic (Monex, Inc.) / U.S. (TradeStation) / crypto assets (Coincheck), it is the polar opposite of the universal-finance model of the megabank groups: a “retail-investor-platform-focused” model. At 2024 年, NTT DOCOMO announced an investment and consolidation, and Monex, Inc. is on track to be positioned as the securities core business of ndfg (the DOCOMO-affiliated financial group) (to be disclosed at 2026 年).

1. Company overview

Legal name: Monex Group, Inc. English name: Monex Group, Inc. Securities code: TSE PRIME 8698 Established: 1999-05-19 (as the former Monex, Inc., jointly invested by Sony + Oki Matsumoto) Current holding-company structure: 2004-08 (Monex Beans Holdings → later renamed Monex Group) Head office: Minato-ku, Tokyo (Akasaka area) Representative: Oki Matsumoto (Representative Executive Officer, Chairman and CEO; founder)

Business type

A pure holding company. It holds, under its umbrella, operating companies for securities, crypto assets, U.S. online brokerage, asset management, and venture investment. Unlike the megabank FGs, it is a non-bank retail-investor platform that holds no banking business.

Major subsidiaries / equity stakes

Monex Group (holding company, listed 8698)
  ├── Monex, Inc. (100%) ── major domestic online brokerage
  ├── Coincheck (Coincheck, 100%) ── crypto-asset exchange (wholly subsidiarized at 2018-04 )
  ├── TradeStation Holdings, Inc. (U.S., 100%) ── parent company of the U.S. online broker
  │     └── TradeStation Securities, Inc. (the U.S. securities-business entity)
  ├── Monex Securities Australia (Australia)
  ├── Monex Asset Management ── asset-management subsidiary
  └── Monex Ventures ── CVC / venture investment

Key chronology (based on public information)

Year/Month	Event
1999-05-19	Monex, Inc. established (jointly invested by Sony + Oki Matsumoto; Oki Matsumoto is a former Goldman Sachs partner)
2000	Monex, Inc. listed on JASDAQ (during the early internet-brokerage boom)
2004	Business reorganization of Monex, Inc. + Beans Securities + Aussie Trade (Australia-affiliated), etc., and holding-company formation (Monex Beans HD)
2007	Changed the holding company’s trade name to Monex Group (see the public history for the surrounding timing)
2010-08	Merger of Monex Beans HD with TradeStation Holdings → subsidiarization of the U.S. online broker
2018-01	Coincheck NEM outflow incident (an outflow of approx. 580 億円-equivalent; Coincheck was an independent company at the time)
2018-04	Coincheck wholly subsidiarized (approx. 36 億円, a rescue acquisition after the NEM outflow incident)
Early 2020 年s	Coincheck’s U.S. SPAC listing plan (via a merger with Thunder Bridge Capital, later withdrawn)
2024	NTT DOCOMO announced an investment in and consolidation of Monex Group (specific terms vary by period)
2026 (planned)	Monex, Inc. to be disclosed as reorganized into the securities core business of the DOCOMO-affiliated financial group ndfg (based on public announcements)

Note: The above chronology is based on public materials (Wikipedia / IR / press releases). Specific equity ratios and integration-scheme terms vary by period, so the latest values should be checked against IR disclosure materials.

2. Business segment map

Segment	Main operator	Characteristics
Domestic online brokerage	Monex, Inc.	A major online brokerage alongside SBI / Rakuten / Matsui, in the No.4-5 tier, with strengths in handling U.S. stocks
Crypto assets	Coincheck	A major domestic crypto-asset exchange operator, rebuilt under the Monex umbrella after the 2018 NEM outflow incident
U.S. online brokerage	TradeStation Securities	For active traders / professionals, in the competitive sphere of Interactive Brokers / Robinhood
Overseas (Australia)	Monex Securities Australia	Limited regional presence
Asset management	Monex Asset Management	Investment trusts / robo-advisor lineup
Venture investment	Monex Ventures	FinTech / crypto-asset-related CVC
Telecom-affiliated financial tie-up	DOCOMO-affiliated finance (related to ndfg, to be disclosed)	Based on the 2024 年 announcement, integration with the d-economic-zone

3 -axis structure (Monex Group’s official concept)

The strategy repeatedly put forward in public materials is a “global retail-investor platform.” Specifically:

Domestic: Monex, Inc. (online-brokerage retail)
U.S.: TradeStation (for U.S. active traders)
Crypto assets: Coincheck (domestic exchange)

A design philosophy that covers different geographies and different asset classes along 3 axes and addresses every need of retail investors horizontally. In contrast to the “bank + trust + securities + overseas” universal model of the megabank groups (mufg / smfg / mizuho-fg), it narrows its segments by focusing on a retail-investor platform.

NTT DOCOMO tie-up (announced 2024 年)

At 2024 年, NTT DOCOMO publicly announced an investment in and consolidation of Monex Group. Monex, Inc. is on track to be positioned as the securities core business of the DOCOMO-affiliated financial group “NDFG” (to be disclosed at 2026 年). By this:

The possibility of integration with the d-economic-zone (d Points / d Payment / d Card, etc.)
Connection to a DOCOMO user base of over 9000 万 people
A telecom × finance fusion model (a competitive structure with the KDDI au Financial / SoftBank PayPay affiliates)

The specific integration scheme and equity ratio vary by period, so this is described only based on public materials. Speculation about management judgments or strategic intent is avoided.

Coincheck’s strategic positioning

Immediately after the 2018 NEM outflow incident (approx. 580 億円-equivalent), Monex wholly subsidiarized it for approx. 36 億円. A symbolic case at the time of a rescue acquisition of a crypto-asset exchange by a major financial group.
After subsidiarization, it rebuilt its internal-control / security / compliance structure and operates as a legitimate exchange that is a member of the JVCEA (Japan Virtual and Crypto assets Exchange Association).
The U.S. SPAC listing plan (early 2020 年s, via Thunder Bridge Capital) was ultimately withdrawn, and it remains a wholly owned Monex subsidiary today.

TradeStation’s position

Occupies a professional / active-trader niche in the U.S. online-brokerage industry.
Competes with Charles Schwab / Fidelity / Robinhood / Interactive Brokers / E*TRADE (under Morgan Stanley), etc.
As Monex Group’s U.S. earnings engine, it makes a large contribution to consolidated results.

4. Regulation / policy

Domestic supervisor: FSA / Kanto Local Finance Bureau
Securities business: Financial Instruments and Exchange Act, Type I Financial Instruments Business (Monex, Inc.)
Crypto assets: Payment Services Act, crypto-asset exchange-operator registration (Coincheck) / JVCEA membership
U.S. (TradeStation): SEC / FINRA regulation
Holding-company regulation: Financial Instruments and Exchange Act, listed-holding-company disclosure
Recent policy points:
- 2025〜 NISA expansion / inflow of younger demographics via the new NISA → intensified competition in retail securities
- 2024〜 crypto-asset taxation (the separate-taxation debate) / stablecoin regime
- 2024〜 disclosure and fairness issues regarding the consolidation scheme of the telecom × finance tie-up

ndfg · mufg · smfg · mizuho-fg · sbi-hd · paypay-fg

Sources

Wikipedia: Monex Group (https://ja.wikipedia.org/wiki/マネックスグループ, extracted 2026-05-19, public information)
Monex Group official corporate site IR section (history / securities reports)
NTT DOCOMO × Monex Group tie-up announcement press release (public portion, 2024 年)
TradeStation Holdings / Coincheck public corporate information

[!info] Verification status confidence: likely (Wikipedia + public IR + press-release cross-check 2026-05-19). Much of the NDFG-related integration scheme is in the portion to be disclosed at 2026 年, so the latest values should be checked against official announcements. This page is based only on public information and avoids speculation about undisclosed management judgments or strategic intent.