HOSIN Electronics Co., LTD. has formally kicked off its Hong Kong initial public offering, targeting gross proceeds of up to HK$1.22 billion based on the maximum offer price.

Key Offering Terms • Total shares on offer: 14.72 million new H-shares, each with a par value of RMB1.00. • Pricing range: HK$72.29–82.90 per H-share; applications for the Hong Kong tranche are funded at the top end (HK$82.90) with refunds if priced lower. • Offer structure: – Hong Kong Public Offering – 1.47 million shares (10% of the deal, subject to reallocation). – International Offering – 13.25 million shares (90%, subject to reallocation, Offer Size Adjustment Option and Over-allotment Option). • Upsize mechanics: – Offer Size Adjustment Option allows up to 2.21 million additional shares (15% of base deal) to meet strong demand in the International Offering. – Over-allotment Option permits issuance of up to a further 2.21 million shares (or 2.54 million if the size adjustment is exercised in full) within 30 days post-listing. • Maximum potential issuance (base + full upsize + full over-allotment) would reach 19.47 million H-shares, lifting the company’s post-listing share capital by roughly 0.52%.

Timetable Highlights (Hong Kong Time) • Application window: 9:00 a.m. 30 Oct 2026 – 12:00 p.m. 9 Nov 2026. • Expected pricing date: by 12:00 p.m. 10 Nov 2026. • Allocation results & final price announcement: by 11:00 p.m. 11 Nov 2026. • Share certificates/CCASS deposits and refunds: on or before 11-12 Nov 2026. • First trading day on the Hong Kong Stock Exchange Main Board: 9:00 a.m. 12 Nov 2026. • Stabilisation window: up to 30 days post close of Hong Kong Public Offering (until 9 Dec 2026).

Application Mechanics • Entire Hong Kong Public Offering employs a fully electronic process. – Individual investors may apply via the HK eIPO White Form portal (www.hkeipo.hk). – CCASS participants can submit electronic applications through the HKSCC FINI system. • Minimum application: 100 H-shares (approx. HK$8,373.60 at the top price, inclusive of levies and fees). • Board lot size post-listing: 100 H-shares.

Advisers and Underwriting • China Securities (International) Corporate Finance Company Limited acts as Sole Sponsor-Overall Coordinator, Sole Global Coordinator, Joint Bookrunner and Joint Lead Manager. • Additional joint bookrunners and joint lead managers are listed in the prospectus. • A stabilising manager may conduct post-listing price-stabilisation activities within the prescribed 30-day period.

Listing Approval and Settlement Conditional approval has been sought from the Hong Kong Stock Exchange for the listing and dealings of: 1) the 14.72 million H-shares in the Global Offering; 2) any shares issued upon exercise of the Over-allotment and Offer Size Adjustment options; 3) shares issuable under the Pre-IPO Share Option Scheme; and 4) shares to be converted from unlisted stock.

Subject to fulfilment of listing conditions, the H-shares will be admitted into CCASS for clearing and settlement from the listing date.