YSXT 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANTTO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number: 001-42444

YSX TECH. CO., LTD

Room 102,Building 1, No. 22, Huazhou Road

HaizhuDistrict, Guangzhou, Guangdong

People’sRepublic of China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F x Form 40-F ¨

On May 8, 2026, YSX TECH. CO., LTD, a Cayman Islands company (the “Company”), received duly executed applications from two applicants for the subscription of an aggregate of 4,000,000 Class B ordinary shares at a subscription price of US$0.5 per share. The Company has received a consent form duly executed by each of the two existing holders of the Class B ordinary shares. On the same day, the board of directors of the Company resolved to approve the share issuance. On May 21, 2026, the Company completed the share issuance.

The Class B ordinary shares in the share issuance were issued in reliance on Rule 903 of Regulation S promulgated under the Securities Act of 1933, as amended, and the subscribers represented that they were not residents of the United States or “U.S. persons” as defined in Rule 902(k) of Regulation S and were not acquiring the Class B ordinary shares for the account or benefit of any U.S. person.

This Form 6-K is hereby incorporated by reference into the registration statements on Form F-3 of the Company (File No. 333-293464), as amended, to the extent not superseded by documents or reports subsequently filed or furnished by the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit 10.1

Application for shares

Date: May 8, 2026

We, Summitway Holding Limited of Sea Meadow House, P.O.Box 116, Road Town, Tortola, British Virgin Islands, apply for the allotment and issue to us of the following fully paid ordinary shares (the Shares) in the capital of the Company to the amount of US$0.5 per Share.

If this application is successful, we agree to pay the Company on demand the sum of US$1,000,000, payable as the Consideration.

Conditional upon the allotment to us of the Shares, we request and authorise the Company to enter our name in the Company's register of members as the holder of the Shares.

We confirm that we will hold the Shares on the terms of Company's articles of association. We also confirm that the address we have given will be our address recorded in the register of members and the address to which notices of meeting and other notices under the Company's articles of association are to be given.

Signed for and on behalf of

Summitway Holding Limited

2

Application for shares and consent

Date: May 8, 2026

We, Altiverse Capital Limited of Asia Leading Chambers, Road Town, Tortola VG1110, British Virgin Islands, apply for the allotment and issue to us of the following fully paid ordinary shares (the Shares) in the capital of the Company to the amount of US$0.5 per Share.

If this application is successful, we agree to pay the Company on demand the sum of US$1,000,000, payable as the Consideration.

Conditional upon the allotment to us of the Shares, we request and authorise the Company to enter our name in the Company's register of members as the holder of the Shares.

We confirm that we will hold the Shares on the terms of Company's articles of association. We also confirm that the address we have given will be our address recorded in the register of members and the address to which notices of meeting and other notices under the Company's articles of association are to be given.

Signed for and on behalf of

Altiverse Capital Limited

2