Company: FWRG
Filing Date: 2025-11-05
Form Type: S-3ASR
Source: 0001628280-25-049615
Chunk: 0

Company: First Watch Restaurant Group, Inc.
Filing Date: 2025-11-05
Form: S-3ASR
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on November 5, 2025</div>

#### Registration No. 333-

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM S-3

### REGISTRATION STATEMENT UNDER

#### THE SECURITIES ACT OF 1933

#### First Watch Restaurant Group, Inc.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware                        |     | 82-4271369            |
| (State or Other Jurisdiction of 
 Incorporation or Organization)  |     | -I.R.S. Employer      
 Identification Number |

#### 8725 Pendery Place, Suite 201,

#### Bradenton, FL 34201
<div align='center'>(941) 907-9800

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)</div>

#### Christopher A. Tomasso

#### President, Chief Executive Officer and Director

#### 8725 Pendery Place, Suite 201

#### Bradenton, FL 34201
<div align='center'>(941) 907-9800

(Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent For Service)</div>

<div align='center'>Copies to:</div>

| Alexander D. Lynch, Esq.   
 Ashley J. Butler, Esq.     
 Weil, Gotshal & Manges LLP 
 767 Fifth Avenue           
 New York, New York 10153   
 (212) 310-8000 (Phone)     
 (212) 310-8007 (Fax)       |     | Jay Wolszczak, Esq.                                
 Chief Legal Officer, General Counsel and Secretary 
 8725 Pendery Place, Suite 201,                     
 Bradenton, FL 34201                                
 (941) 907-9800                                     |

<div align='center'>Approximate date of commencement of proposed sale to the public:

From time to time after the effective date of this Registration Statement</div>

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. o

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only