Quantitative Research

JPX Margin Trading Weekly (Sep 4th): Kioxia, SoftBank, Advantest, Fujikura, Mitsubishi UFJ Financial

04 Sep 2026 By Ke Yan, CFA
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Abstract: We analyzed JPX margin trading positions for stocks with market cap of at least USD 100m as of September 4th, with the aggregated net margin trading position at USD28,745m. The net margin position decreased 1.2% week-on-week, slightly underperforming the TOPIX 500 which fell 1.0%, while 1,067 stocks saw margin loan positions increase and 925 saw decreases. The largest weekly decreases in net margin position were Kioxia (285A JP) at -USD1,072m (-20.5%), SoftBank (9984 JP) at -USD96m (-8.5%), and Mitsubishi UFJ Financial (8306 JP) at -USD85m (-11.3%). The largest weekly increases came from Advantest (6857 JP) at +USD89m (+132.3%), Fujikura (5803 JP) at +USD85m (+12.2%), and Mitsubishi Heavy Industries (7011 JP) at +USD85m (+17.5%). By absolute net position size, Kioxia leads at USD4,301m, followed by SoftBank at USD1,015m and Fujikura at USD747m.

SoftBank (9984 JP) Mitsubishi UFJ Financial (8306 JP) Mitsubishi Heavy Industries (7011 JP) Kioxia (285A JP) Fujikura (5803 JP) Advantest (6857 JP)

Highlighted Stocks

SoftBank, Mitsubishi UFJ Financial, Mitsubishi Heavy Industries, Kioxia, Fujikura, Advantest

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