In March 1953, KDDI was founded, marking the beginning of its establishment and presence in the telecommunications sector.

KDDI Corp. was founded by Kazuo Inamori on June 1, 1984 in Tokyo, Japan. The company operates in various segments including Personal Services, Value Services, Business Services, Global Services, and Others, providing telecommunications and related services.

On September 3, 1993, KDDI Corporation obtained 17.025 billion yen through its Initial Public Offering (IPO), increasing its capital to 27.853 billion yen. Subsequently, the company's shares were listed on the Second Section of the Tokyo Stock Exchange.

On May 20, 1994, KDDI Corporation implemented a 1.1 for 1 stock split for its common shares, adjusting the number of outstanding shares.

On August 2, 1994, KDDI Corporation split its common shares, reducing the face value from 50,000 yen to 5,000 yen.

On November 19, 1994, KDDI Corporation obtained 25.551 billion yen through a public offering of new shares, increasing its capital to 53.404 billion yen.

No specific event mentioned for September 1, 1995.

In December 1996, KDD established its liaison office in Hanoi, Vietnam, aiming to expand its presence and provide ICT services in the region.

On March 3, 1998, KDDI Corporation increased its capital by 19.23 billion yen by issuing new shares to Kyocera Corporation. The total capital of the company reached 72.634 billion yen after this transaction.

KDD Corporation was formed as a result of the merger between Kokusai Denshin Denwa Co., Ltd. (KDD) and Teleway Corp. in April 1999.

No specific event mentioned on September 30, 2000 related to KDDI Corporation.

On October 2, 2000, DDI CORPORATION, KDD Corporation, and IDO CORPORATION merged to create a new company known as KDDI. The new entity operated under the KDDI corporate brand.

On April 1, 2002, au by KDDI initiated the operation of 3G networks employing CDMA2000 1x technology.

On November 28, 2003, au by KDDI introduced the EV-DO Rev 0 service under the CDMA 1X WIN brand, setting a new standard in Japan's mobile communication sector with fixed-rate data plans.

By June 15, 2005, customers had downloaded 10 million full length Chaku Uta Full songs within six months of its introduction.

On January 01, 2006, KDDI Corporation merged with POWEREDCOM Inc. The merger ratio was set at 0.032 shares of POWEREDCOM Inc. for one share of KDDI Corporation.

On January 26, 2006, the first pointing local search application, Mapion Local Search – Powered by GeoVector, was introduced on the KDDI network for GPS and compass equipped handsets.

TEPCO integrated its internal optical network company into KDDI through an absorption-type corporate split. As a result, 144,569 shares, including 57,562 newly issued shares, were allotted to TEPCO.

TEPCO and KDDI underwent a corporate separation process during this period. The details of this separation were not specified in the provided information.

TU-KA, a subsidiary of KDDI and a 2G PDC cellular operator in Tokyo, Nagoya, and Osaka, known for featuring Ayumi Hamasaki in commercials, ceased operations on March 31, 2008.

The collaboration between KDDI and Naoto Fukasawa led to the establishment of the iida brand in April 2009, marking a new era for au's mobile products.

On October 21, 2011, KDDI acquired Content Delivery Network CDNetworks for $167 million, expanding its digital infrastructure capabilities.

KDDI Corporation, a telecommunications services company, was established on July 12, 2013.

By March 2014, KDDI achieved a remarkable 99% population coverage ratio for their platinum band 800MHz 4G LTE network, expanding their reach significantly.

In May 2014, KDDI introduced the au WALLET service, offering customers a new payment solution.

In July 2014, KDDI together with Sumitomo Group signed an agreement with Myanmar State owned Myanmar Post and Telecommunication (MPT) to jointly operate a mobile phone service in Myanmar for the next 10 years, marking a significant international partnership.

In August 2014, KDDI collaborated with global companies, including Google, to build a 60Tbit/s undersea data transmission cable connecting the US West Coast and Japan. The cable became operational in June 2016.

As of August 3, 2015, KDDI had reached a certain milestone or status that may have been noteworthy in its corporate journey.

On May 18, 2016, a total of 70,396,543 shares of treasury stock were cancelled.

Between May 12, 2017, and September 22, 2017, KDDI Corporation acquired 33,526,600 shares of treasury stock.

On May 17, 2017, a total of 33,280,732 shares of treasury stock were cancelled.

On February 8, 2024, KDDI Corporation had a modification in its operations or structure.

The KDDI Corporation stock closed at $14.76 on March 28, 2024, with a slight fluctuation in the market.

On April 1, 2024, the KDDI Corporation stock closed at $14.66, showing a decrease from the previous day.

The KDDI Corporation stock closed at $14.62 on April 2, 2024, with a decrease of 0.27% from the previous day's closing price.

KDDI's vision for the year 2030.