On Jun 28, 本多 敏行 submitted the Change Report to Ministry of Finance. The report shows that 本多 敏行 increased their holdings in $JMACS Japan (5817.JP)$, with their joint shareholding ratio up from 6.96% to 8.62%.
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.