Oct. 31, 2023

JCR Affirmed A/Stable and J-1 on SUMCO

Nov. 16, 2022

JCR Upgraded Long-term Issuer Rating on SUMCO to A/Stable; Affirmed J-1 on CP

Oct. 27, 2021

JCR Affirmed A- and J-1 on SUMCO; Revised Outlook from Stable to Positive

Nov. 24, 2020

JCR Affirmed A-/Stable and J-1 on SUMCO

Nov. 05, 2019

JCR Affirmed A-/Stable and J-1 on SUMCO

Oct. 31, 2018

JCR Affirmed A-/Stable and J-1 on SUMCO

Oct. 23, 2017

JCR Upgraded Rating on SUMCO from BBB+/Positive to A-/Stable and from J-2 to J-1

Dec. 06, 2016

JCR Affirmed BBB+/Positive and J-2 on SUMCO

Jul. 13, 2015

JCR Affirmed BBB+, J-2 Ratings on SUMCO; Revised Outlook to Positive

Apr. 02, 2015

SUMCO's Announcement of Public Offering

Jun. 20, 2014

JCR Downgraded Rating on SUMCO from A-/Negative and J-1 to BBB+/Stable and J-2

May. 13, 2013

JCR Affirmed A-/Negative Long-term Issuer Rating on SUMCO

Feb. 02, 2012

JCR Downgraded Rating on SUMCO from A/Negative to A-/Negative

Dec. 08, 2010

Revised rating on SUMCO from A+/Negative to A/Negative

Oct. 16, 2009

Assigned preliminary A+ rating to shelf reg. of SUMCO

Sep. 16, 2009

Affirmed A+ and J-1 rating on SUMCO; Revised outlook to Negative

May. 29, 2008

Upgraded rating on SUMCO to A+/Stable from A/Positive

Jun. 18, 2007

Assigned preliminary A rating to shelf registration of SUMCO

May. 29, 2007

Affirmed A on sr.debts of SUMCO and Revised outlook to Positive