APossible leakOctober 1, 2026 announced

佐川急便（お荷物問い合わせ）Data breach / unauthorized access incident

Reviewed by Yutaro SasaoWritten by Leak Watch editorial teamOctober 1, 2026 published ・ October 20, 2026 updated

Occurred on: Unconfirmed
Announced on: October 1, 2026
Severity: AFinancial and HR records — information that easily translates into monetary damage.
Scale: Unknown
Main impact: There is a risk that parcel senders' and recipients' names, addresses, and phone numbers may have been exposed. スマートクラブ会員 may also have had email addresses and member IDs affected.
Information involved: Email addressUser / member IDPhone numberHome addressFull name
Cause / key point: Cause is under investigation.
Industry: Transport & travel
Listing / capital: UnlistedParent company: SGホールディングス(東証プライム 9143)
佐川急便 is a subsidiary of SGホールディングス.
Sources: 「お荷物問い合わせサービス」への不正アクセスによる個人情報流出の可能性について（第2報） 2026-10-01
Last updated: October 20, 2026

Stock price reaction to the disclosureSGホールディングス・親会社 / 東証プライム 9143

2026.09.11 〜 2026.10.22Loading…

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Written & reviewed

Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.

CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.

Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed: October 20, 2026

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction