(TRANSLATION FOR REFERENCE ONLY) September 14, 2021

To Our Shareholders:

Corporate Name: PROTO CORPORATION

Representative: Kenji Kamiya, President

Securities Code: 4298 (TSE and NSE 1st Section)

Contact: Takehito Suzuki, Executive Officer

Tel: +81-52-934-2000

Notice of application for selection of Prime Market listing

On July 9, 2021, PROTO CORPORATION ("PROTO", the "Company") received the results of a preliminary assessment by the Tokyo Stock Exchange, Inc. (TSE) of PROTO's compatibility with continued listing criteria for the TSE's new market segments. The assessment confirmed that PROTO meets the continued listing criteria for the Prime Market.

At a meeting on September 14, 2021, the Board of Directors approved a resolution to select a Prime Market listing, based on the results of the assessment.

PROTO now plans to submit its new market segment selection application in accordance with the TSE's schedule.

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Proto Corporation published this content on 14 September 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 14 September 2021 06:11:02 UTC.