What agreements related to the National Grid (NGG) 2036 notes are included as exhibits?

The exhibits include an underwriting agreement dated June 4, 2026 and a Third Supplemental Indenture dated June 9, 2026, along with the form of global note for the 5.405% Notes due 2036, plus associated legal opinions and consents from Linklaters LLP.

National Grid issues $750M 5.405% 2036 notes

National Grid plc has issued U.S.$750,000,000 aggregate principal amount of 5.405% Notes due 2036 and is submitting a set of related documents.

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Form Type

6-K

Rhea-AI Filing Summary

National Grid plc has issued U.S.$750,000,000 aggregate principal amount of 5.405% Notes due 2036 and is submitting a set of related documents. These materials are being filed so they can be incorporated into the company’s existing Registration Statement on Form F-3.

The filing includes the underwriting agreement, a Third Supplemental Indenture setting the terms of the new notes, the form of global note, and legal opinions and consents from Linklaters LLP covering both English and New York law. The report is signed on behalf of National Grid by the Head of Plc Governance.

Key Figures

Notes issued: U.S.$750,000,000 aggregate principal amount Coupon rate: 5.405% Maturity year: 2036 +2 more

5 metrics

Notes issued U.S.$750,000,000 aggregate principal amount 5.405% Notes due 2036

Coupon rate 5.405% Interest rate on Notes due 2036

Maturity year 2036 Maturity of 5.405% Notes

Underwriting agreement date June 4, 2026 Date of underwriting agreement for the notes

Third Supplemental Indenture date June 9, 2026 Date of supplemental indenture governing the notes

Key Terms

Registration Statement on Form F-3, Third Supplemental Indenture, Global Note, foreign private issuer, +1 more

5 terms

Registration Statement on Form F-3 regulatory

"solely for incorporation into the Registration Statement on Form F-3"

A registration statement on Form F-3 is a streamlined filing used by eligible foreign companies to register securities for sale in the U.S., often as a “shelf” that lets them offer shares quickly when market conditions are right. For investors it matters because it signals that the company can raise capital on short notice—potentially increasing liquidity but also the risk of share dilution if new stock is issued—similar to a company keeping a pre-approved credit line ready to use.

Third Supplemental Indenture financial

"Third Supplemental Indenture to the Indenture among National Grid plc"

Global Note financial

"Form of Global Note for the 5.405% Notes due 2036"

foreign private issuer regulatory

"REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

aggregate principal amount financial

"issuance by National Grid plc of U.S.$750,000,000 aggregate principal amount"

The aggregate principal amount is the total amount of money borrowed through a bond or loan that the borrower promises to repay. It’s like the original price tag on a loan or bond, showing how much money is involved in the deal. This number matters because it indicates the size of the debt and helps investors understand the scale of the borrowing.

FAQ

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What did National Grid (NGG) report in its June 2026 Form 6-K?

National Grid reported the issuance of U.S.$750,000,000 of 5.405% Notes due 2036 and filed related contracts, legal opinions, and consents so these materials can be incorporated into its existing shelf Registration Statement on Form F-3.

What are the key terms of National Grid (NGG) 5.405% Notes due 2036?

The notes have an aggregate principal amount of U.S.$750,000,000 and bear interest at 5.405% with a maturity in 2036. The detailed terms are documented in a Third Supplemental Indenture and a form of global note included as exhibits in the filing.

Why did National Grid (NGG) file these documents into its Form F-3 registration?

National Grid filed the underwriting agreement, supplemental indenture, global note form, and legal opinions so they are formally incorporated into its existing Form F-3 Registration Statement, supporting the registered status of the newly issued 5.405% Notes due 2036 in the U.S. market.

Which legal opinions support the National Grid (NGG) 5.405% Notes due 2036?

Linklaters LLP provided legal opinions on the validity of the debt securities under English law and New York law. Their related consents are also filed, ensuring the opinions can be used within National Grid’s Form F-3 Registration Statement for the 5.405% Notes due 2036.

Who signed the June 2026 National Grid (NGG) Form 6-K?

The Form 6-K was signed on behalf of National Grid plc by Beth Melges, who is identified as Head of Plc Governance. This signature confirms the company’s authorization of the filing related to the U.S.$750,000,000 5.405% Notes due 2036.

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Accepted by SEC EDGAR 06/09/2026 - 04:51 PM

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 June, 2026

Commission File Number: 001-14958

NATIONAL GRID plc

(Translation of registrant’s name into English)

1-3 Strand London WC2N 5EH, England

(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 ☒ Form 40-F ☐

EXPLANATORY NOTE

In connection with the issuance by National Grid plc of U.S.$750,000,000 aggregate principal amount of 5.405% Notes due 2036, National Grid plc is filing the following documents solely for incorporation into the Registration Statement on Form F-3 (File No. 333-281812):

Exhibit List


Exhibit No.		Description

1.1		Underwriting Agreement dated June 4, 2026.

4.1		Third Supplemental Indenture to the Indenture among National Grid plc, as Issuer, and The Bank of New York Mellon, London Branch, as Trustee and Paying Agent, dated as of June 9, 2026.

4.2		Form of Global Note for the 5.405% Notes due 2036 (included in Exhibit A of the Third Supplemental Indenture (Exhibit 4.1 to this filing)).

5.1		Opinion of Linklaters LLP, as to the validity of the debt securities being registered as to certain matters of English law.

5.2		Opinion of Linklaters LLP, as to the validity of the debt securities being registered as to certain matters of New York law.

23.1		Consent of Linklaters LLP (included in Exhibit 5.1 to this filing).

23.2		Consent of Linklaters LLP (included in Exhibit 5.2 to this filing).

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.


	National Grid plc (Registrant)

Date: June 9, 2026		By:	/s/ Beth Melges
			Name: Beth Melges
			Title: Head of Plc Governance

Source: View Original Filing on SEC EDGAR

Filing Exhibits & Attachments

4 documents