# EDGAR Filing Document

**Accession Number:** 0000932540
**File Stem:** 0000932540-25-000041
**Filing Date:** 2025-11
**Character Count:** 2721
**Document Hash:** a138ff85b873bd3f1910f4f8356363ea
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000932540-25-000041.hdr.sgml**: 20251121

**ACCESSION NUMBER**: 0000932540-25-000041

**CONFORMED SUBMISSION TYPE**: X-17A-5

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250930

**FILED AS OF DATE**: 20251121

**DATE AS OF CHANGE**: 20251121

**EFFECTIVENESS DATE**: 20251121

**PERIOD START**: 20241001

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GROUP ONE TRADING LLC
- **CENTRAL INDEX KEY:** 0000932540

**ORGANIZATION NAME:**
- **EIN:** 943209378
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** X-17A-5
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 008-47762
- **FILM NUMBER:** 251507458

**BUSINESS ADDRESS:**
- **STREET 1:** 425 S FINANCIAL PLACE
- **STREET 2:** SUITE 3400
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60605
- **BUSINESS PHONE:** 312-347-8864

**MAIL ADDRESS:**
- **STREET 1:** 425 S FINANCIAL PLACE
- **STREET 2:** SUITE 3400
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60605

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GROUP ONE TRADING, L.P.
- **DATE OF NAME CHANGE:** 20241010

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GROUP ONE TRADING LLC
- **DATE OF NAME CHANGE:** 20241002

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GROUP ONE TRADING, L.P.
- **DATE OF NAME CHANGE:** 20030409

### Attached PDF Documents

**Attachment 1:** `GroupOne2025Public.pdf`

_No text found in this document._

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM X-17A-5

### ANNUAL AUDITED REPORT

### Filer Information

**Filer CIK:** 0000932540

**Filer CCC:** XXXXXXXX

**Is this a LIVE or TEST filing?:** LIVE

**Would you like a Return Copy?:** No

### Submission Information

**Report Period Begin Date:** 10-01-2024

**Report Period End Date:** 09-30-2025

**Type of Registrant:** Broker-dealer

**Any material weaknesses identified?:** No

### Registrant Identification

**Name of Broker-Dealer:** GROUP ONE TRADING LLC

**Business Address:** 425 S FINANCIAL PLACE, SUITE 3400, CHICAGO, IL, 60605

**Contact Person:** Chad Grosam

**Contact Phone:** 312-294-2345

### Independent Public Accountant Identification

**Accountant Name:** RSM US LLP

**Accountant Address:** 30 South Wacker Drive, Ste. 3300, Chicago, IL, 60606

**Accountant Type:** Certified Public Accountant

### OATH OR AFFIRMATION

I, **Chad Grosam**, swear (or affirm) that, to the best of my knowledge and belief, the accompanying financial statements and supporting schedules pertaining to the firm of **GROUP ONE TRADING LLC**, as of **09-30-2025**, are true and correct.

**Signature:** Chad Grosam

**Title:** Chief Financial Officer

**Notarized:** Yes