# EDGAR Filing Document

**Accession Number:** 0001488542
**File Stem:** 0001488542-26-000005
**Filing Date:** 2026-3
**Character Count:** 2576
**Document Hash:** c628b68c3852a6656677656772758714
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001488542-26-000005.hdr.sgml**: 20260302

**ACCESSION NUMBER**: 0001488542-26-000005

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

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260302

**DATE AS OF CHANGE**: 20260302

**EFFECTIVENESS DATE**: 20260302

**PERIOD START**: 20250101

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SIMPLEX TRADING, LLC
- **CENTRAL INDEX KEY:** 0001488542

**ORGANIZATION NAME:**
- **EIN:** 272031362
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** X-17A-5
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 008-68556
- **FILM NUMBER:** 26709843

**BUSINESS ADDRESS:**
- **STREET 1:** 230 S. LASALLE STREET
- **STREET 2:** SUITE 08-500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60604
- **BUSINESS PHONE:** 312-360-2466

**MAIL ADDRESS:**
- **STREET 1:** 230 S. LASALLE STREET
- **STREET 2:** SUITE 08-500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60604

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SET TRADING PARTNERS, LLC
- **DATE OF NAME CHANGE:** 20120501

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MULTIPLEX TRADING LLC
- **DATE OF NAME CHANGE:** 20100402

### Attached PDF Documents

**Attachment 1:** `2025_Simplex_Audit_PUBLIC.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:** 0001488542

**Filer CCC:** XXXXXXXX

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

**Would you like a Return Copy?:** Yes

### Submission Information

**Report Period Begin Date:** 01-01-2025

**Report Period End Date:** 12-31-2025

**Type of Registrant:** Broker-dealer

**Any material weaknesses identified?:** No

### Registrant Identification

**Name of Broker-Dealer:** SIMPLEX TRADING, LLC

**Business Address:** 230 S. LASALLE STREET, SUITE 08-500, CHICAGO, IL, 60604

**Contact Person:** Joan Rockey

**Contact Phone:** 3123602476

### Independent Public Accountant Identification

**Accountant Name:** RSM

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

**Accountant Type:** Certified Public Accountant

### OATH OR AFFIRMATION

I, **Joan Rockey**, swear (or affirm) that, to the best of my knowledge and belief, the accompanying financial statements and supporting schedules pertaining to the firm of **SIMPLEX TRADING, LLC**, as of **03-02-2026**, are true and correct.

**Signature:** Joan Rockey

**Title:** CFO/FINOP