Company: CODI-PB
Filing Date: 2025-05-08
Form Type: DEFA14A
Source: 0001345126-25-000024
Chunk: 0

Company: Compass Diversified Holdings
Filing Date: 2025-05-08
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

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

#### SCHEDULE 14A INFORMATION
| PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE |
| SECURITIES EXCHANGE ACT OF 1934                  |
| (Amendment No.   )                               |

| Filed by the registrant                    |     |                                                                                 |     | ý |
| Filed by a party other than the registrant |     |                                                                                 |     | ¨ |
| Check the appropriate box:                 |     |                                                                                 |     |   |
| ¨                                          |     | Preliminary Proxy Statement                                                     |     |   |
| ¨                                          |     | Confidential, for use of the Commission only (as permitted by Rule 14a-6(e)(2)) |     |   |
| ¨                                          |     | Definitive proxy statement                                                      |     |   |
| x                                          |     | Definitive additional materials                                                 |     |   |
| ¨                                          |     | Soliciting material pursuant to § 240.14a-11(c) of § 240.14a-12                 |     |   |

### COMPASS DIVERSIFIED HOLDINGS
<div align='center'>(Exact name of registrant as specified in its charter)</div>

### COMPASS GROUP DIVERSIFIED HOLDINGS LLC
<div align='center'>(Exact name of registrant as specified in its charter)</div>

#### N/A
<div align='center'>(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.                                                                                      |
| ¨                                                  |     | Fee paid previously with preliminary materials.                                                       |
| ¨                                                  |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i) (1) and 0-11. |

<div align='center'>301 Riverside Avenue, Second Floor

Westport, Connecticut 06880

NOTICE OF POSTPONEMENT OF 2025 ANNUAL MEETING OF STOCKHOLDERS</div>

Please be advised that on May 7, 2025 the Board of Directors elected to postpone the annual meeting of