Yamagata Bank

Yamagata Bank is a Japanese regional banking institution headquartered in Yamagata City, Yamagata Prefecture. Its business is centered on serving households, companies, public-sector bodies, and other organizations in Yamagata and neighboring parts of the Tohoku region, while also maintaining a presence in major Japanese cities, including Tokyo. As a regional bank, its role is closely connected to the local economy: it provides conventional deposit-taking and lending services, supports business finance, and offers customers access to investment and insurance-related products. The bank traces its institutional origins to 1878, when the 81st National Bank was established. That institution was later absorbed by Ryouu Bank in 1897. During the first half of the twentieth century, the organization expanded and changed through a series of mergers with smaller financial institutions. These consolidations formed the historical basis of the modern bank, which adopted the name Yamagata Bank in 1965. Yamagata Bank’s branch network has historically been concentrated in Yamagata Prefecture, with additional branches in other important Tohoku cities and a Tokyo branch. This footprint gives it a locally focused operating model rather than the nationwide scale associated with Japan’s largest city banks. Its positioning is therefore based on regional access, long-term customer relationships, and support for the prefecture’s households and businesses. The bank has also participated in transactions extending beyond ordinary local banking. In October 2005, it joined Saitama Resona Bank, the 82 Bank, and Hokkoku Bank in providing funds to Allegro MicroSystems, a United States subsidiary of Sanken Electric, following Sanken Electric’s acquisition of Minnesota-based semiconductor producer PolarFab. The transaction illustrates the bank’s participation in a coordinated financial investment involving other Japanese banks and an overseas industrial business, although the available reference material does not provide detailed terms or the bank’s individual financial exposure. In March 2025, fraudsters reportedly impersonated Yamagata Bank in automated voice calls directed at customers. The reported incident included a loss of ¥100 million by Yamagata Railway. This event placed the bank’s name in the context of customer-targeted financial fraud and highlights the operational and reputational risks faced by banks when criminals imitate their communications. The available material does not establish that the bank itself was accused of wrongdoing. Yamagata Bank remains an active Japanese regional bank. Publicly available reference material identifies its historical origins, geographic footprint, banking role, and selected financial or security-related events, but does not provide enough verified information here to state current revenue, assets, market capitalization, executive leadership, ownership structure, or official website details.

Yamagata Bank’s institutional history reaches back to the establishment of the 81st National Bank in 1878. The national-bank system was part of the early development of modern banking in Japan, and the 81st National Bank served as the earliest identified predecessor of the present institution. In 1897, it was absorbed by Ryouu Bank, an institution founded one year earlier. This change placed the bank within a broader process of consolidation as Japan’s financial system developed. During the first half of the twentieth century, the organization merged with a number of smaller financial institutions. These combinations gradually shaped the regional banking organization that would later operate under the Yamagata Bank name. The available historical account does not identify every predecessor or provide a complete chronology of the individual mergers, but it indicates that the modern institution was formed through sustained consolidation rather than through a single uninterrupted corporate entity. The bank adopted its present name in 1965. Since then, its identity has been tied to Yamagata Prefecture, where Yamagata City serves as its headquarters. Its branch network has principally covered Yamagata Prefecture, with additional locations in major cities elsewhere in the Tohoku region and a branch in Tokyo. This distribution reflects a regional-bank model: the institution is rooted in a defined local economy while maintaining selected access points outside its home prefecture. Yamagata Bank’s activities include traditional retail and commercial banking. Its product scope includes deposits and lending, together with investment trusts and insurance-related services. These activities allow it to serve individual customers as well as companies and other organizations. The available sources do not provide sufficient verified detail to describe its current balance sheet, digital-banking strategy, branch count, employment, or present ownership structure. In October 2005, the bank took part in a coordinated financing transaction with Saitama Resona Bank, 82 Bank, and Hokkoku Bank. The banks jointly injected funds into Allegro MicroSystems, an American subsidiary of Sanken Electric, after Sanken Electric purchased PolarFab, a Minnesota-based semiconductor producer. The transaction is notable because it connected a Japanese regional bank with an overseas semiconductor-related business through a multi-bank financing arrangement. The sources available for this dossier do not state Yamagata Bank’s individual contribution, the financing instrument, or the eventual outcome of the investment. A later event involved criminal impersonation rather than a disclosed strategic decision by the bank. In March 2025, scammers reportedly used automated voice calls while posing as Yamagata Bank and targeted the bank’s clients. Yamagata Railway was reported to have lost ¥100 million. The incident demonstrates how a regional bank’s trusted local identity can be exploited in social-engineering fraud. No evidence in the supplied material indicates that Yamagata Bank was responsible for the fraud or that regulators imposed a penalty on it. Yamagata Bank is described in the available reference material as an active regional bank. A fuller modern history would require verified company disclosures or other authoritative sources covering governance, financial performance, branch operations, ownership, and recent strategic initiatives.

• 2025

  Reported impersonation fraud

  [1]Yamagata Banken.wikipedia.org

  Scammers reportedly used automated calls impersonating Yamagata Bank, with Yamagata Railway reported as a victim of a ¥100 million loss.

• 2005

  Participation in Allegro MicroSystems financing

  [1]Yamagata Banken.wikipedia.org

  Yamagata Bank joined three other Japanese banks in injecting funds into Allegro MicroSystems after Sanken Electric acquired PolarFab.

• 1965

  Adoption of the Yamagata Bank name

  [1]Yamagata Banken.wikipedia.org

  Following decades of mergers and institutional consolidation, the organization changed its name to Yamagata Bank.

• 1897

  Absorption by Ryouu Bank

  [1]Yamagata Banken.wikipedia.org

  The 81st National Bank was absorbed by Ryouu Bank, which had been established the previous year.

• 1878

  Establishment of the 81st National Bank

  [1]Yamagata Banken.wikipedia.org

  The earliest identified predecessor of Yamagata Bank, the 81st National Bank, was founded in Japan.

A locally focused full-service regional bank serving households, businesses, and institutions in Yamagata Prefecture and surrounding Tohoku markets.

• Retail banking

  Deposits

  Yamagata Bank provides deposit-taking services as part of its conventional regional-banking operations. These services support household, business, and institutional customers, although the supplied sources do not specify the current account types, rates, eligibility rules, or digital features.

• Consumer and commercial banking

  Loans

  Lending is a core part of the bank’s role in the Yamagata economy. The bank serves borrowers through regional banking activities directed at individuals, companies, and other organizations. Available references do not provide a verified breakdown of mortgage, consumer, small-business, corporate, or public-sector loan products.

• Investment products

  Investment trusts

  Investment trusts are identified among the bank’s typical financial products. They extend the institution’s offering beyond deposits and loans by giving customers access to professionally managed investment vehicles. Specific funds, fees, distribution arrangements, and investment performance are not established by the supplied sources.

• Protection and financial planning

  Insurance products

  Insurance-related products form part of Yamagata Bank’s broader financial-services offering. The available material does not identify particular insurance partners, product classes, sales channels, or current terms, so this entry is limited to the general product category.

• 2025

  Fraudsters impersonated Yamagata Bank in automated calls

  In March 2025, scammers reportedly posed as Yamagata Bank in automated voice calls directed at customers. Yamagata Railway was reported to have lost ¥100 million. The supplied material describes criminal impersonation and does not allege misconduct by the bank itself.

  Source

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• 2005

  Joint funding for Allegro MicroSystemsOther

  Background

  Sanken Electric acquired Minnesota-based semiconductor producer PolarFab, and Allegro MicroSystems operated as Sanken Electric’s American subsidiary.

  Action taken

  Yamagata Bank joined Saitama Resona Bank, 82 Bank, and Hokkoku Bank in injecting funds into Allegro MicroSystems.

  Aftermath

  The transaction represented a coordinated financing activity involving several Japanese banks and an overseas semiconductor business. The available sources do not disclose Yamagata Bank’s individual contribution or the investment outcome.

  Source

• 1965

  Adoption of the current corporate nameStrategy

  Background

  The institution had undergone multiple mergers and changes among predecessor financial organizations during the first half of the twentieth century.

  Action taken

  The organization changed its name to Yamagata Bank.

  Aftermath

  The name became the basis of the bank’s modern regional identity. Further details about the restructuring are not provided in the available reference.

  Source

• 2005

  Yamagata Bank joined a financing transaction involving Allegro MicroSystems[1]Yamagata Banken.wikipedia.org

  Other

  Yamagata Bank joined Saitama Resona Bank, 82 Bank, and Hokkoku Bank in injecting funds into Allegro MicroSystems, a Sanken Electric subsidiary, after Sanken acquired PolarFab in the United States.

1. 1Yamagata Banken.wikipedia.org