Seiyu Kogyo

9170.TServices
Major holders (5%+) · 6
HolderStakeChangeFiled
HOSONUMA Co., Ltd.45.40%-4.59pp2026-08-28
MASAHITO HOSONUMA23.61%-2.38pp2026-08-28
NAOKO HOSONUMA8.47%-1.87pp2026-08-28
Odake Company Co., Ltd7.11%—2024-08-09
Yamazaki Gravel Inc.5.13%+0.02pp2024-05-14
Yamazaki Gravel Inc.5.13%+0.02pp2024-05-14

Each holder's own ratio from its most recent large-shareholding report.

Former and minor holders (below 5%) · 5
RIE HOSONUMA1.18%2026-08-28
Yamazen Inc.0.58%2024-03-18
Yamazaki Holdings Inc.0.53%2024-03-18
Horizon Inc.0.09%2024-03-18
Kyota Uemura0.02%2024-03-22
Ownership history · 30
FiledHolderRatioChangePurpose
2026-08-28RIE HOSONUMA2026-08-281.18%-0.12ppStable shareholder; Long-term holding
2026-08-28NAOKO HOSONUMA2026-08-288.47%-1.87ppStable shareholder; Long-term holding
2026-08-28MASAHITO HOSONUMA2026-08-2823.61%-2.38ppStable shareholder; Long-term holding
2026-08-28HOSONUMA Co., Ltd.2026-08-2845.40%-4.59ppStable shareholder; Long-term holding
2024-08-09Odake Company Co., Ltd2024-08-097.11%newPure investment
2024-06-19AmendedHOSONUMA RIE2024-06-19 · amended1.30%newStable shareholder; Long-term holding
2024-06-19AmendedHOSONUMA NAOKO2024-06-19 · amended10.34%newStable shareholder; Long-term holding
2024-06-19AmendedHOSONUMA MASAHITO2024-06-19 · amended25.99%newStable shareholder; Long-term holding
2024-06-19Amended-2024-06-19 · amended49.99%newStable shareholder; Long-term holding
2024-05-14AmendedYamazaki Gravel Inc.2024-05-14 · amended5.13%+0.02ppAsset management / investment
2024-03-22AmendedYamazaki Holdings Inc.2024-03-22 · amended—new—
2024-03-22AmendedYamazen Inc.2024-03-22 · amended—new—
2024-03-22AmendedHorizon Inc.2024-03-22 · amended—new—
2024-03-22AmendedKyota Uemura2024-03-22 · amended0.02%no change—
2024-03-22AmendedYamazaki Gravel Inc.2024-03-22 · amended5.11%new—
2024-03-18AmendedKyota Uemura2024-03-18 · amended0.02%no change—
2024-03-18AmendedHorizon Inc.2024-03-18 · amended0.09%no change—
2024-03-18AmendedYamazaki Holdings Inc.2024-03-18 · amended0.53%no change—
2024-03-18AmendedYamazen Inc.2024-03-18 · amended0.58%no change—
2024-03-18AmendedYamazaki Gravel Inc.2024-03-18 · amended3.91%no change—

Each holder in 5% reports, joint holders included. Purpose is classified from the filed text.