8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the SecuritiesExchange Act of 1934

Date of Report (Date of earliest event reported): January 27, 2026

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

As a result of a review of the Code of Ethics for Senior Financial Officers, effective January 27, 2026, the Board of Trustees of Eversource Energy and the Boards of Directors of The Connecticut Light and Power Company, NSTAR Electric Company and Public Service Company of New Hampshire each approved and adopted an Amended and Restated Code of Ethics for Senior Financial Officers (the “Amended and Restated Code”). The Amended and Restated Code applies to each of the registrants named in this report. The Amended and Restated Code reflects changes in how public companies describe auditor oversight and compliance programs, and other clarifying, stylistic and non-substantive revisions. It also reflects current best practice by identifying the Audit Committee as having ongoing oversight responsibility for the Amended and Restated Code. The Amended and Restated Code does not materially change the responsibilities and obligations that applied previously and did not result in any waiver, explicit or implicit, of any provision of the previous Code for any of the registrants.

The summary of the Amended and Restated Code included in this Current Report on Form 8-K is qualified in its entirety by reference to the full text of the Amended and Restated Code. The Amended and Restated Code can be found on Eversource Energy’s website at www.eversource.com under “Investor Relations – Corporate Governance – Code of Ethics for Senior Financial Officers.” The contents of Eversource Energy’s website are not incorporated by reference in this report.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized.