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KDDI

2-21-1 Takanawa, THE LINKPILLAR 1 NORTH, Minato-ku, Tokyo, Tokyo, 108-8618, Japan

Overview

KDDI Corporation is a Japanese telecommunications operator. It was created in 2000 through a merger of DDI, KDD and IDO and now employs over 15,000 people. The company provides a broad range of services, including fixed-line phone communication, mobile phone and web services, and Internet services. It also has a ownership stake in two Japanese cable television companies, Jupiter Telecommunications (J:COM) and Japan Cablenet (JCN). KDDI's mobile phone and web arm is branded as "au". The company is the current No. 2 in Japan's mobile communications market, trailing NTT DoCoMo and ahead of SoftBank.

Total investments
69
Lead investments
15
Investments · 12mo
17
Active investors
10

Sector focus

  • Finance
  • Mobile
  • Telecommunications
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Investment portfolio

  • FLASH

    Participated · Seed · Aug 2026

    FLASH develops and operates short-drama and short-anime production and distribution services, anchored by its smartphone app "Million - ミリオン." The app was ranked No.1 among domestic short-drama apps in Japan for downloads and revenue between January and June 2026 (Sensor Tower, iOS+Android). FLASH plans to expand its exclusive original-drama lineup, strengthen production capabilities, and scale marketing to grow the app's user base. Concurrently, the company is developing video-focused AI products intended to support concepting, production, editing, and distribution optimization. FLASH is also moving into IP and publishing, with plans to release multiple comics on major e-book stores starting autumn 2026 and pursue other IP monetization such as film and merchandise. The company was founded on June 12, 2024, is headquartered in Meguro, Tokyo, and has raised a cumulative ~¥1.3 billion in seed funding following its most recent seed-extension round.

  • RevComm

    Participated · Series B · Jul 2026

    RevComm offers phone-call analysis AI MiiTel Phone, web-conference analysis AI MiiTel Meetings with transcription and talk-analysis features, and an in-person conversation analysis product MiiTel RecPod. The company was founded in July 2017 and is headquartered in Marunouchi, Chiyoda-ku, Tokyo (Marunouchi Building, 28th floor). Its reported capital is ¥935,000,000. The product portfolio focuses on visualizing telephone sales and customer responses and on providing AI-enabled transcription and talk analysis for meetings. The available articles do not disclose revenue, user counts, or other operating metrics. The company has been the subject of prior fundraising coverage referenced in the announcement.

  • Starlight Engine

    Participated · Equity · Jul 2026

    Starlight Engine was established in April 2025 as a group company of Kyoto Fusioneering and is focused on advancing fusion energy through its FAST project. FAST is a privately led, industry–academia initiative that adopts a tokamak configuration and aims to demonstrate fusion power generation in the 2030s by generating and sustaining D–T burning plasma and demonstrating integrated power generation and fuel-cycle systems. The project has completed its conceptual design and is currently moving into engineering design and construction preparations. SLE is coordinating with leading fusion researchers and a wide set of private-sector partners and universities to develop the project and domestic supply chains. The company plans to use newly raised funds to accelerate engineering and technology development, site selection, regulatory processes, supply chain development, and organizational expansion. SLE intends to grow its headcount to about 200 employees over the next two years as it advances toward fusion power demonstration and future commercial plants.

  • Coincheck Group

    Led · Equity · Jun 2026

    Coincheck Group provides digital asset trade execution, custody, staking, and asset management services and is a market leader in Japan. The company is expanding beyond its retail leadership into institutional services and digital asset infrastructure. Following the strategic investment by KDDI, Coincheck has entered a business alliance aimed at expanding the digital asset market in Japan through customer referrals, revenue sharing, and initiatives to increase mainstream adoption. The firm plans to leverage partnerships to simplify onboarding and broaden access to digital assets by combining platform expertise with large consumer distribution. The announcement did not disclose revenue, user counts, or other financial metrics.

  • Coincheck

    Led · Equity · May 2026

    Coincheck operates as a cryptocurrency exchange and digital-asset services provider under Monex Group. Its holding entity in this transaction is Coincheck Group N.V. (CCG), which remains a consolidated subsidiary of Monex. The company recently entered a business alliance with KDDI and, together with KDDI and au Financial Holdings, formed au Coincheck Digital Assets, Inc. to promote a non-custodial wallet business. As part of this strategic partnership, KDDI agreed to a $65,063,256.48 capital injection into CCG and will hold 14.9% of CCG’s outstanding ordinary shares after the transaction closes. The company’s financials, revenue, and user metrics were not disclosed in the articles.

Team

  • Takashi Shouji

    Vice President

  • Tadashi Onodera

    Chairman of the Board

  • Takashi Tanaka

    President

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  • Makoto Takahashi

    Senior Vice President

    LinkedIn