Form 8-K

8-K — CALIX, INC

Accession: 0001406666-26-000016

Filed: 2026-04-21

Period: 2026-04-21

CIK: 0001406666

SIC: 4899 (COMMUNICATION SERVICES, NEC)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — calx-20260421.htm (Primary)

EX-99.1 (a991april2026pressrepurcha.htm)

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8-K

8-K (Primary)

Filename: calx-20260421.htm · Sequence: 1

calx-20260421

0001406666FALSE00014066662024-05-092024-05-09

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): April 21, 2026

CALIX, INC.

(Exact name of Registrant as specified in its charter)

Delaware 001-34674 68-0438710

(State or other jurisdiction

of incorporation) (Commission

File No.) (I.R.S. Employer

Identification No.)

3155 Olsen Drive, Suite 450, San Jose, California

95117

(Address of principal executive offices) (Zip Code)

(408) 514-3000

(Registrant’s telephone number, including area code)

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:

☐ 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 Name of Each Exchange on Which Registered

Common Stock, par value $0.025 per share

CALX New York Stock Exchange

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 13(a) of the Exchange Act). o

Item 8.01 Other Events.

The Company maintains a repurchase program for its common stock. As of March 28, 2026, the remaining authorized balance under the program was $63.4 million. On April 21, 2026, the Board amended the stock repurchase program to authorize the repurchase of up to an additional $100 million of its common stock, bringing the total authorization under the program up to $525 million.

Under the repurchase program, repurchases can be made from time to time using a variety of methods, which may include open market purchases, privately negotiated transactions or otherwise, all in accordance with the rules of the SEC and other applicable legal requirements. The specific timing, price and size of the purchases will depend on prevailing stock prices, general economic and market conditions, and other considerations consistent with the Company’s capital allocation strategy. The repurchase program does not obligate the Company to acquire a particular amount of common stock, and the repurchase program may be suspended or discontinued at any time at the Company’s discretion.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1

Press Release dated April 21, 2026, announcing increase in stock repurchase authorization.

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: April 21, 2026 Calix, Inc.

By: /s/ Doug McNitt

Doug McNitt

EVP, General Counsel

EX-99.1

Filename: a991april2026pressrepurcha.htm · Sequence: 2

Document

Exhibit 99.1

Calix Increases Stock Repurchase Authorization by An Additional $100 Million

SAN JOSE, CA—April 21, 2026—Calix, Inc. (NYSE: CALX) today announced that its board of directors increased the authorization to repurchase the Company’s common stock by an additional $100 million under the existing stock repurchase program. The additional authorization announced today will be added to the remaining common stock repurchase authorization which totaled $63.4 million at the end of the first quarter of 2026.

Under the repurchase program, repurchases can be made from time to time using a variety of methods, which may include open market purchases, privately negotiated transactions or otherwise, all in accordance with the rules of the Securities and Exchange Commission and other applicable legal requirements. The specific timing, price and size of the purchases will depend on prevailing stock prices, general economic and market conditions, and other considerations consistent with the Company’s capital allocation strategy. The stock repurchase program does not obligate Calix to purchase any dollar amount or number of shares of common stock and the program may be suspended or discontinued at any time.

About Calix

Calix, Inc. (NYSE: CALX) is an AI platform company that enables service providers to transform their operations and accelerate delivery of differentiated experiences—so they can compete and win in the markets and communities they serve.

Through the AI-native Calix One platform, service providers can securely and privately activate agentic-AI alongside their human teams to acquire new subscribers, grow existing subscriber revenue, and build loyalty across residential, business, municipal, and MDU markets. More than 1,200 customers of all sizes leverage the Calix One platform, which has evolved over 15 years at an investment of more than $2 billion.

Calix innovation cycles are underpinned by a strong financial balance sheet and a people first culture that routinely earns broad industry recognition—winning 81 culture and innovation awards since 2025 alone, as well as Fortune’s 100 Best Companies to Work For® in 2026.

Forward-Looking Statements

This press release contains forward-looking statements that are based upon management’s current expectations and are inherently uncertain. Forward-looking statements relate to, but are not limited to, Calix’s stock repurchase program, are based upon information available to us as of the date of this release, and we assume no obligation to revise or update any such forward-looking statement to reflect any event or circumstance after the date of this release, except as required by law. Actual results and the timing of events could differ materially from current expectations based on risks and uncertainties affecting Calix’s business. The reader is cautioned not to rely on the forward-looking statements contained in this press release. Additional information on potential factors that could affect Calix’s results and other risks and uncertainties are detailed in its quarterly reports on Form 10-Q and Annual Report on Form 10-K filed with the SEC and available at www.sec.gov.

Category: Financial

Investor Inquiries:

Nancy Fazioli

VP, Investor Relations

InvestorRelations@calix.com

(669) 308 3901

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