On March 30, 2022, the JPO released its annual report, "JPO Status Report 2022," which summarizes intellectual property initiatives and domestic and international trends in 2021.
The top 10 patent and design registrations (excluding international design registration applications) in 2021 are as follows.

Registration of Patent
MITSUBISHI ELECTRIC Corporation (3,494cases), TOYOTA MOTOR CORPORATION (3,389cases), CANON INC. (3,134cases), Panasonic Intellectual Property Management Co., Ltd. (2,706cases), DENSO Corporation (1,650cases), NEC Corporation (1,608cases), Honda Motor Co., Ltd.(1,591cases), RICOH COMPANY,LTD. (1,469cases), TOSHIBA CORPORATION (1,433cases), Fujitsu Limited (1,416cases)

Registration of Design
Panasonic Intellectual Property Management Co., Ltd. (331cases), MITSUBISHI ELECTRIC Corporation (228cases),  KOKUYO Co.,Ltd. (219cases), OKAMURA CORPORATION (197cases),  LIXIL Corporation (136cases),  LEC, Inc. (136cases),  Gifu Plastic Industry Co., Ltd. (136cases),  MIRAI INDUSTRY CO., LTD. (131cases), Honda Motor Co., Ltd. (126cases), RISU PACK CO., LTD. (118cases)

 
Japan Patent Office
https://www.jpo.go.jp/resources/report/statusreport/2022/document/index/all.pdf