Japan Stock of the Day | Kabutaro & Friends

On August 20, 2026, the most talked-about Japanese stock online was TIER IV <593A>.
Background: On August 20, the company announced a collaboration with Renesas Electronics <6723> to build an open, AI-native computing platform for software-defined vehicles (SDVs). Combining TIER IV's software technology and its open-source autonomous driving software Autoware with Renesas' next-generation automotive system-on-chip R-Car, the partnership aims to deliver a highly scalable solution supporting up to Level 4 autonomous driving, in which a vehicle operates fully autonomously under specified conditions. The announcement drew a surge of buy orders in the afternoon session, rapidly expanding the stock's gains. Shares hit the daily upper price limit of 1,033 yen at 2:21 p.m. and closed there, up 150 yen (+17.0%), ranking among the top gainers on the Tokyo Stock Exchange Growth Market. The stock opened at 890 yen and hit an intraday low of 885 yen at 9:01 a.m., making the afternoon surge especially pronounced. Market capitalization stands at 65.62 billion yen. The company, an autonomous driving startup founded out of Nagoya University, only listed on the Growth Market on July 22 and had hit a year-to-date low of 871 yen on August 7.