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 Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 10, 2026

LOGO

Illumina, Inc.

(Exact name of registrant as specified in its charter)

001-35406

(Commission File Number)

Delaware

33-0804655

(State or other jurisdiction

of incorporation)

(I.R.S. Employer

Identification No.)

5200 Illumina Way, San Diego, CA 92122

(Address of principal executive offices) (Zip code)

(858) 202-4500

(Registrant’s telephone number, including area code)

N/A

(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:

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

Common Stock, $0.01 par value

ILMN

The Nasdaq Stock Market LLC

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

Emerging growth company ☐

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 13a of the Exchange Act. ☐

Item 8.01.

Other Events.

On August 10, 2026, Illumina, Inc. (“Illumina”) entered into an Underwriting Agreement (the “Underwriting Agreement”) with J.P. Morgan Securities LLC and Citigroup Global Markets Inc., as representatives of the several underwriters named therein, for the issuance and sale by Illumina of $300,000,000 aggregate principal amount of its 4.950% notes due 2029 (the “Notes”).

The offering is expected to close on August 17, 2026, subject to customary closing conditions.

Illumina expects to use the net proceeds from the offering, together with cash on hand, to repay its 4.650% notes due September 9, 2026.

The Notes will be issued and sold pursuant to a Registration Statement on Form S-3 (Registration No. 333-281921) under the Securities Act of 1933, as amended, that Illumina filed with the Securities and Exchange Commission (the “SEC”) on September 4, 2024. Illumina is filing the Underwriting Agreement as part of this Current Report on Form 8-K for purposes of such Registration Statement. The description of the Underwriting Agreement set forth above is qualified by reference to the Underwriting Agreement filed as Exhibit 1.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 9.01.

Exhibits.


Exhibit Number		Description of Exhibit

1.1		Underwriting Agreement, dated August 10, 2026 between Illumina and J.P. Morgan Securities LLC and Citigroup Global Markets Inc., as representatives of the several underwriters named therein

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Date: August 12, 2026


ILLUMINA, INC.,

By	/s/ Ankur Dhingra
	Name:	Ankur Dhingra
	Title:	Chief Financial Officer