On Sep 18, 春日 博文 and related parties submitted the Change Report to Ministry of Finance. The report shows that 春日 博文 and related parties increased their holdings in $Port (7047.JP)$, with their joint shareholding ratio up from 33.12% to 33.19%.
Source: Edinet Announcement
What is the 5% shareholding reporting system?
Shareholders with holding ratio exceeding 5% must submit a Large Shareholding Report within five business days from that day. If the holding ratio increases or decreases by 1% or more after submitting a Large Shareholding Report, the holder must submit a Change Report within five business days from that day.