GSC — Proxy Solicitation & Information Statement 2026

May 25, 2026

Gigastorage Corporation
2026 Annual General Shareholders’ Meeting Notice
(Summary Translation)

I. * Meeting Time: 9:30 a.m. on Friday, June 26, 2026
* Meeting Venue: No. 3, Gongye 1st Rd., Hukou Township, Hsinchu County 303, Taiwan (R.O.C.)
The registration time of the annual Shareholders’ Meeting will begin at 9:00 a.m.; The registration place is the same as the meeting venue.

II. Meeting Agenda:

(I) Report Items:
1. The 2025 Business Report
2. The 2025 Audit Committee's Review Report
3. The Implementation Report of Strengthening a Business Plan
4. Remuneration to Directors Report of 2025

(II) Approval Items:
1. The Company’s 2025 Business Report and Financial Statements
2. 2025 Deficit Compensation Proposal

(III) Discussion Items
1. To facilitate the future listing (IPO) plan of the Company’s subsidiary, Whole Sun Green Power Co., Ltd., the Company may proceed with a share disposal of its holdings in Whole Sun Green Power Co., Ltd. and waive its participation in the subsidiary’s cash capital increase.
2. Proposal for the private placement of common shares by the Company.

(IV) Extraordinary Motions

III. If there are issues related to Article 172 of the Company Act in the main contents of the annual shareholder’s meeting, shareholders can find the details from the Market Observation Post System (MOPS)(https://mops.twse.com.tw). The website path is as follow: Basic information → Electronic books → Shareholders’ meetings → Reference materials for the shareholders’ meetings.

IV. In accordance with Article 165 of the Company Act, transfer of shares of the Company shall be suspended from April 28, 2026 through June 26, 2026.

V. The Company will compile and post a general list of information on calls for proxies, if any, by May 26, 2026, on the Securities & Futures Institute website (http://free.sfib.org.tw). Investors may conduct search for the information by logging on the above site. The Stock Transfer Agency Department of Taishin Securities Co., Ltd. will certify the tally of proxies.

VI. Except for the public announcements on Market Observation Post System, the Attendance Cards and the Proxies are enclosed. Shareholders, who decide to attend the meeting in person, please sign or stamp on the Attendance Card (the 3rd paper) and bring it to the meeting venue. Shareholders, who decide to attend the meeting by proxy, please sign or stamp on the Proxy and fill in the form of the name and address of the proxy by yourself, and send it to the Taishin Securities stock transfer agency department, five days before the meeting for the sake of

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sending the Attendance Card to the proxy.

VII. Shareholders can exercise their voting rights electronically during the period from May 27, to June 23, 2026. Please visit the electronic voting platform of TDCC STOCKVOTE (https://www.stockvote.com.tw) and follow the instructions. [Website: https://www.stockvote.com.tw]

VIII. Participants in the shareholders meeting are requested to bring identification documents for inspection.

IX. We would appreciate it if you could acknowledge receipt of this letter.

Sincerely,

Board of Directors,

GIGASTORAGE CORPORATION