On Sep 24, 住友化学株式会社 submitted the Change Report to Ministry of Finance. The report shows that 住友化学株式会社 decreased their holdings in $Sumitomo Bakelite (4203.JP)$, with their joint shareholding ratio down from 21.19% to 15.47%.
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.