UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of: October 2025

Commission File Number: 000-27663

SIFY TECHNOLOGIES LIMITED

(Translation of registrant’s name into English)

Tidel Park, Second Floor

No. 4, Rajiv Gandhi Salai, Taramani

Chennai 600 113, India

(91) 44-2254-0770

(Address of principal executive office)

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 ¨

Sify Infinit Spaces Limited (“SISL”), a wholly owned subsidiary of Sify Technologies Limited (“Sify”), publicly filed a draft red herring prospectus on October 17, 2025 with the Securities and Exchange Board of India, BSE Limited, and the National Stock Exchange of India Limited, in connection with its proposed initial public offering (the “IPO”) of SISL’s equity shares with face value ₹10 each (“Equity Shares”).

The proposed IPO is expected to comprise a fresh issue of Equity Shares aggregating up to ₹25,000 million (₹2,500 crores) and an offering of Equity Shares aggregating up to ₹12,000 million (₹1,200 crores) by certain existing and eligible shareholders of SISL. The IPO is subject to receipt of requisite regulatory approvals, market conditions, and other applicable considerations.

This announcement does not constitute an offer to sell or the solicitation of an offer to buy any securities in the United States or any other jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. The securities referred to in this announcement have not been and will not be registered in the U.S. under the Securities Act of 1933, as amended (“Securities Act”) and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act. The securities referred to in this announcement have not been and will not be registered, listed or otherwise qualified in any other jurisdiction outside of India.

Forward Looking Statements

This announcement contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The forward-looking statements contained herein are subject to risks and uncertainties that could cause actual results to differ materially from those reflected in the forward-looking statements. Sify undertakes no duty to update any forward-looking statements.

For a discussion of the risks associated with Sify’s business, please see the discussion under the caption “Risk Factors” in the company’s Annual Report on Form 20-F for the year ended March 31, 2025, which has been filed with the United States Securities and Exchange Commission and is available by accessing the database maintained by the SEC at www.sec.gov, and Sify’s other reports filed with the SEC.

Signature

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.

Date: October 17, 2025
	For Sify Technologies Limited

	By:	/s/ M P Vijay Kumar
		Name:	M P Vijay Kumar
		Title:	Executive Director and Group Chief Financial Officer

SIFY TECHNOLOGIES LTD 6-K