岡三証券グループ (Okasan Securities Group)

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This entry sits under securities-firms INDEX. Read it against Tokai Tokyo Fh for peer / contrast context and securities index for the broader system / regulatory boundary.

TL;DR

A mid-sized independent securities holding company (TSE PRIME 8609). 1923 年 Seiichi Kato founded it in Nagoya as Okasan Shoten → incorporated in 1944 → became a holding company in 2009-04 . It holds an independent mid-sized position ranking behind the 5 major securities firms (ndfg Nomura / Daiwa / SMBC Nikko / Mizuho Securities / MUMSS). It pursues a hybrid strategy combining a strong face-to-face retail base in the Chukyo economic zone (originating in Nagoya / Mie) with online securities (Okasan Online). Its main competitors are the fellow Chukyo-based Tokai Tokyo FH and the online-based monex-group / Matsui Securities. ^•

1. Company profile

Legal name: 株式会社岡三証券グループ ^• English name: Okasan Securities Group Inc. Securities code: TSE PRIME 8609 ^• Established: 1923 (former Okasan Shoten, founded by Seiichi Kato / Nagoya City) ^• Incorporated: 1944 (Okasan Securities incorporated as a company) ^• Became a holding company: 2009-04-01 (intermediate holding company → full holding company structure) ^• Business type: Financial instruments business (Type I Financial Instruments Business Operator) holding company Founder: Seiichi Kato

Main subsidiaries (based on public information)

Okasan Securities Group (holding company, listed 8609)
  ├── Okasan Securities (domestic face-to-face retail securities, 100%) ── core subsidiary
  ├── Okasan Online (formerly Okasan Online Securities, online securities, 100%)
  ├── Okasan Asset Management (investment trust management, 100%)
  ├── Okasan International (overseas securities business, 100%)
  └── Okasan Niigata Securities (regional affiliate, Niigata base)

Merger history / predecessors

• 1923: Seiichi Kato founded Okasan Shoten in Nagoya City ^•
• 1944: Okasan Securities incorporated as a company ^•
• The 1 corner of the former three major Chubu securities firms (a mid-sized securities firm of the Chukyo economic zone)
• Expanded nationwide during the postwar high-growth period, extending its bases from Chukyo → Kanto and Kansai

Key chronology (excerpt) ^•

2. Business segment map

Mid-sized independent positioning

• Industry ranking: a mid-sized independent securities firm ranking behind the 5 major securities firms (ndfg Nomura HD / Daiwa Securities G / SMBC Nikko / Mizuho Securities / Mitsubishi UFJ Morgan Stanley Securities) ^•
• “An independent firm not belonging to a megabank group” is its axis of differentiation from other mid-sized securities firms ranking behind the majors

Face-to-face × online hybrid strategy

• Okasan Securities (face-to-face): consulting for high-net-worth individuals, the senior segment, and small and mid-sized enterprises in the Chukyo region
• Okasan Online (online): low-cost trading for the younger segment and self-directed investors
• Coexistence of the 2 brand to cover customer segments as a full-line securities firm
• Fintech tie-ups: linkage of peripheral services such as “Okasan SBI Bank” and “Okasan kabu.com” ^•

Main competitors

• Matsui Securities (online securities pioneer)
• monex-group Monex Group (online securities / global)
• SBI HD group securities (the largest online firm)

4. Regulation / policy

• Supervisor: Financial Services Agency (FSA)

• Business regulation: Financial Instruments and Exchange Act (Type I Financial Instruments Business Operator)

• Listing: TSE PRIME 8609

• Recent policy topics:

  • New NISA expansion (2024~): a tailwind for face-to-face retail securities; Okasan Securities also strengthens its advisory business
  • Online securities fee-free trend: review of Okasan Online’s fee structure
  • Financial instruments intermediary system: expansion of tie-ups with regional banks and regional shinkin banks

Related

• ndfg · mufg · smfg · mizuho-fg · monex-group

Sources

• Wikipedia: 岡三証券グループ (https://ja.wikipedia.org/wiki/岡三証券グループ, extracted 2026-05-19)
• Wikipedia: 岡三証券 (https://ja.wikipedia.org/wiki/岡三証券, extracted 2026-05-19)
• Okasan Securities Group official IR (based on securities reports, published 2025-06 )

[!info] Verification status confidence: likely (cross-checked against v1.0 public information 2026-05-19). Founding 1923 / becoming a holding company 2009-04 / subsidiary composition are public information via Wikipedia. Specific figures for financials and market ranking are subject to point-in-time variation; for the latest values, refer to the Okasan IR Quarterly.