CITIC Securities Co., Ltd. on the Listing Sponsorship of STO Express Co., Ltd. for 2026 Convertible Bonds

Statement

CITIC Securities Co., Ltd. (hereinafter referred to as "CITIC Securities") accepts the sponsorship of STO Express Co., Ltd. (hereinafter referred to as "STO Express" or "the Company") for the issuance of convertible bonds aimed at unspecified investors in 2026. The sponsorship is based on the relevant laws and regulations of the People's Republic of China and the provisions of the Securities Law of the People's Republic of China, as well as the regulations of the China Securities Regulatory Commission (hereinafter referred to as "CSRC"). CITIC Securities will ensure that the sponsorship documents are accurate and complete. If any errors or omissions occur, it may lead to significant losses for investors, and CITIC Securities will bear the corresponding responsibilities.

In this sponsorship letter, except for the text indicated otherwise, references to "STO Express" shall be consistent with the "STO Express Convertible Bond Issuance Explanation" for 2026.

Table of Contents

Statement.................................................................................................................1

Table of Contents..................................................................................................2

Section 1: Basic Information on This Bond Issuance........................................3

1. Issuer Basic Information.................................................................................3

2. Application for Listing on the Shenzhen Stock Exchange............................14

3. The Issuance Process.......................................................................................23

4. Sponsorship Representatives, Coordinators, and Other Team Members.......24

Section 2: Relationship Between Sponsors and Issuers.................................25

1. Sponsors and Related Shareholders, Actual Controllers, and Important Relationships....................................................25

2. Issuers and Related Shareholders, Important Relationships with Sponsors or Related Shareholders....................................25

3. The Role of Sponsorship Representatives and Other Personnel....................25

4. The Relationship Between Sponsors and Issuers...........................................26

Section 3: Sponsorship Matters......................................................................27

Section 4: Risks Related to Issuance...............................................................28

Section 5: Other Matters Requiring Explanation...........................................29

Section 6: Recommendations from Sponsors on This Issuance....................30

Section 1: Basic Information on This Bond Issuance

1. Issuer Basic Information

(1) Issuer Overview

(2) Main Business Introduction

The company mainly focuses on express delivery services, adhering to the development goal of "building a leading express delivery brand." It aims to establish a strategic layout in the express delivery sector, focusing on "data-driven operations" and refined management, to enhance service quality and efficiency.

Key Financial Data and Business Indicators

1. Consolidated Assets and Liabilities

1. Consolidated Profit and Loss