On Sep 4, 有限会社 大久保興産 and related parties submitted the Change Report to Ministry of Finance. The report shows that 有限会社 大久保興産 and related parties decreased their holdings in $Japan Electronic Materials (6855.JP)$, with their joint shareholding ratio down from 9.77% to 6.0%.
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.