Naoki Kuroda Cuts Stake in Kaizen Platform (4170) to 2.9% | Large Shareholding Report

A large shareholding report (EDINET filing) reveals that Naoki Kuroda reduced his stake in Kaizen Platform (4170) to 2.9%. The company provides a DX support platform offering UI/UX improvement services for websites called "KAIZEN UX" and advertising and video production services through "KAIZEN AD." Kuroda's 2.9% stake represents a major shareholder position in the listed company. The shareholding ratio decreased by 3.64 percentage points from the previous filing, reflecting an ongoing adjustment of his investment position.

Staged Reduction from 5% to 2.9% Over Approximately One Year

Kuroda has filed large shareholding reports for Kaizen Platform on twelve occasions, including this latest submission. His initial filing on August 12, 2025 showed a 5% stake, which he has gradually reduced through multiple sales over the past year. This current filing dated August 28, 2026 reflects a 2.1 percentage point decline from the earliest disclosure. At the stock price of ¥151 on that date, the sale generated ¥190 million for Kuroda. Rather than a single transaction, this represents a phase in his ongoing position adjustment strategy.

Shareholding Position Among Major Investors

Kaizen Platform has several investors subject to large shareholding disclosure requirements. SBI Securities holds 11.07% as the largest shareholder, significantly exceeding Kuroda's 2.9%. Rakuten Securities holds 2.98%, placing Kuroda's stake at nearly an equivalent level. While Kuroda maintains a position within the upper tier of the company's shareholder base, today's sale could result in a reshuffling of the shareholding hierarchy among major investors.

Elevated Valuation Metrics and Position Adjustment Strategy

As of August 28, 2026, Kaizen Platform trades at an exceptionally high PER of 132.0 times. The PBR stands at 1.32 times, indicating substantial premium pricing relative to book value. The stock's position within the 52-week range at 92% (where 0% is the low and 100% is the high) demonstrates the share price now trades near the upper end of its annual trading band. Kuroda's ongoing stake reduction at this elevated valuation level may reflect divergent investment perspectives on the company's future prospects.

*Speculation: As market demand for DX support services remains robust and stock valuations remain stretched, Kuroda may be executing a reduction strategy to realize gains or realign risk exposure relative to his original investment objectives.