Company: CALX
Filing Date: 2025-03-27
Form Type: DEF 14A
Source: 0001406666-25-000011
Chunk: 0

Company: CALIX, INC
Filing Date: 2025-03-27
Form: DEF 14A
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>__________________________</div>

#### SCHEDULE 14A
<div align='center'>(RULE 14A-101)</div>

### INFORMATION REQUIRED IN PROXY STATEMENT

#### SCHEDULE 14A INFORMATION

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
<div align='center'>(Amendment No. __)

__________________________</div>

| Filed by the Registrant |     | x |     | Filed by a Party other than the Registrant |     | o |

Check the appropriate box:

| o |     | Preliminary Proxy Statement                                                     |
| o |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| x |     | Definitive Proxy Statement                                                      |
| o |     | Definitive Additional Materials                                                 |
| o |     | Soliciting Material under §240.14a-12                                           |

#### CALIX, INC.
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

| x |     | No fee required.                                                                                    |
| o |     | Fee paid previously with preliminary materials.                                                     |
| o |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

#### CALIX, INC.

#### 2777 Orchard Parkway

#### San Jose, California 95134

### NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

#### TO BE HELD ON MAY 8, 2025
To the Stockholders of Calix, Inc.:

The Annual Meeting of Stockholders (“Annual Meeting”) of Calix, Inc. (“Calix”), will be held virtually, via live webcast at www.virtualshareholdermeeting.com/CALX2025 , on Thursday, May 8, 2025 at 10:45 a.m. Pacific Daylight Time. The Annual Meeting will be held for the following purposes:

1. To elect three directors to the Calix Board of Directors (“Board”);

2. To approve the Fourth Amended and Restated 2019 Equity