# EDGAR Filing Document

**Accession Number:** 0001695295
**File Stem:** 0001437749-26-018781
**Filing Date:** 2026-5
**Character Count:** 2303
**Document Hash:** 12d8548e5ab5af9ff59cc0df3f6fd1c4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001437749-26-018781.hdr.sgml**: 20260528

**ACCESSION NUMBER**: 0001437749-26-018781

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260528

**DATE AS OF CHANGE**: 20260528

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** HYDROFARM HOLDINGS GROUP, INC.
- **CENTRAL INDEX KEY:** 0001695295
- **STANDARD INDUSTRIAL CLASSIFICATION:** WHOLESALE-MISCELLANEOUS NONDURABLE GOODS [5190]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 814895761
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39773
- **FILM NUMBER:** 261038025

**BUSINESS ADDRESS:**
- **STREET 1:** 1510 MAIN STREET
- **CITY:** SHOEMAKERSVILLE
- **STATE:** PA
- **ZIP:** 19555
- **BUSINESS PHONE:** 707-765-9990

**MAIL ADDRESS:**
- **STREET 1:** 1510 MAIN STREET
- **CITY:** SHOEMAKERSVILLE
- **STATE:** PA
- **ZIP:** 19555

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Hydrofarm Holdings Group, Inc.
- **DATE OF NAME CHANGE:** 20180830

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Innovation Acquisition One Corp
- **DATE OF NAME CHANGE:** 20170120

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

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**SCHEDULE 14A**

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

**Securities Exchange Act of 1934**

**(Amendment No.)**

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Filed by the Registrant ☒ 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 Rule14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Under §240.14a-12

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| |
|:---|
| **Hydrofarm Holdings Group, Inc.** |
| **(Name of Registrant as Specified In Its Charter)** |
| **(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** |

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Payment of Filing Fee (Check all boxes that apply):

☒ No fee required <br> ☐ Fee paid previously with preliminary materials <br> ☐ Fee computed on table in exhibit required by Item25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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![notice02.jpg](notice02.jpg)

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![notice01.jpg](notice01.jpg)