Filer Snapshot

SIMPLEX TRADING, LLC SEC EDGAR Filings

SEC filings, ownership reports, and insider transactions for CIK 0001488542.

Entity Type

Company

Total Filings

72

Latest Filing

02 Mar 2026

Industry

n/a

Save this filer page for the next filing cycle

Keep this page in your research queue, then return to compare new filings with prior context.

Save and revisit

Save this filer page

Create a free account to keep this page in your watchlists and return after a new SEC filing changes the record here.

Create free account to save and revisit this page

Best next steps

Start with the latest filings table, then open the strongest context page for this filer.

  • Use the filings table to verify the newest submission, form type, and report period.
  • Open the deeper context page only when this filer actually has insider or ownership signal.
Go to latest filings table Browse SEC filer directory
Source: SEC filing X-17A-5

X-17A-5 filed on 02 Mar 2026 for CIK 0001488542.

View Source Filing
Business address
230 S. Lasalle Street, Suite 08 500, Chicago, IL, 60604
Top securities (13F)
AAPL, NVDA, AVGO, NFLX, SPY, WDC, TSLA, SOXL, NVO, SOFI, SOXX, META, INTC, CI, PFE, MSFT, PLTR, BABA, ASTS, and UNH
State of incorporation
DE
Fiscal year end
31 December
Former names
SET TRADING PARTNERS, LLC (to 28 Feb 2014), MULTIPLEX TRADING LLC (to 29 Feb 2012)

Quick Takeaways

  • SIMPLEX TRADING, LLC is an SEC filer tracked under CIK 0001488542.
  • 72 filings are listed on this profile.
  • Common form coverage includes X-17A-5, 13F-HR, FOCUSN and more.

What Changed

  • Latest filing: X-17A-5 filed on 02 Mar 2026.
  • Report period: 31 Dec 2025.

Why This Matters

  • You can quote filing dates and form types directly from the SEC record on this page.
  • Use this profile before deeper ownership or insider analysis to confirm filing history context.

Source Evidence

Source: SEC filing X-17A-5

X-17A-5 filed on 02 Mar 2026 for CIK 0001488542.

View Source Filing

Return Loop

Why revisit this filer page

A newly filed X-17A-5 can change the filing history, ownership context, or next research path for SIMPLEX TRADING, LLC.

Latest source-backed update
X-17A-5 filed 02 Mar 2026
Why come back
Revisit after a new SEC filing appears to compare the updated record with prior filings.
  • Latest filing on record: X-17A-5 filed 02 Mar 2026.
  • Save this filer if you want a stable place to return after the next filing cycle.
  • Open the latest filing table or ownership context to verify what changed.

Filer freshness comes from SEC EDGAR submission history and related source-backed ownership or portfolio filings when available.

Jump to save and follow actions Open latest filings table

Latest update

What changed recently for SIMPLEX TRADING, LLC

New filing available

Latest 13F period: Q4 2025. Open the source-backed page to inspect the fresh filing or facts context.

Update date

11 Feb 2026

Page type

Filer profile

Latest period

Q4 2025

Institutional portfolio context was refreshed from a 13F filing filed on 11 Feb 2026.

Open filer profile Browse recent public updates

Benchmark Context

Benchmark context for this company

SIMPLEX TRADING, LLC has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.

Why this is notable

Latest 13F period: Q4 2025. That gives you a fresh baseline before you compare this company with peers.

  • Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
  • Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

Open company facts Browse metric rankings

Filer Overview

SIMPLEX TRADING, LLC has filed 72 SEC EDGAR filings since 01 Mar 2011. Common forms include X-17A-5, 13F-HR, FOCUSN, 13F-HR/A.

Latest 13F filings

Latest Filings

Recent SEC filings for SIMPLEX TRADING, LLC with direct links to document and filing folders.

Form type Document Filing Description Filing date Reporting date File number(s)
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 02 Mar 2026 31 Dec 2025 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 11 Feb 2026 31 Dec 2025 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 12 Nov 2025 30 Sep 2025 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 05 Aug 2025 30 Jun 2025 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 12 May 2025 31 Mar 2025 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 03 Mar 2025 31 Dec 2024 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 11 Feb 2025 31 Dec 2024 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 08 Nov 2024 30 Sep 2024 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 25 Jul 2024 30 Jun 2024 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 25 Apr 2024 31 Mar 2024 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 04 Mar 2024 31 Dec 2023 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 04 Mar 2024 31 Dec 2023 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 02 Feb 2024 31 Dec 2023 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 01 Nov 2023 30 Sep 2023 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 04 Aug 2023 30 Jun 2023 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 11 Jul 2023 31 Dec 2022 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 27 Apr 2023 31 Mar 2023 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 02 Feb 2023 31 Dec 2022 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 04 Nov 2022 30 Sep 2022 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 03 Aug 2022 30 Jun 2022 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 02 May 2022 31 Mar 2022 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 04 Mar 2022 31 Dec 2021 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 04 Mar 2022 31 Dec 2021 008-68556
13F-HR/A Open 13F-HR/A document View SEC filing for 13F-HR/A 23 Feb 2022 31 Dec 2021 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 04 Feb 2022 31 Dec 2021 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 28 Oct 2021 30 Sep 2021 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 12 Aug 2021 30 Jun 2021 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 10 May 2021 31 Dec 2020 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 26 Apr 2021 31 Mar 2021 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 01 Mar 2021 31 Dec 2020 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 02 Feb 2021 31 Dec 2020 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Oct 2020 30 Sep 2020 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 13 Jul 2020 30 Jun 2020 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 29 Apr 2020 31 Mar 2020 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 02 Mar 2020 31 Dec 2019 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 02 Mar 2020 31 Dec 2019 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 05 Feb 2020 31 Dec 2019 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 15 Oct 2019 30 Sep 2019 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 26 Jul 2019 30 Jun 2019 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 18 Apr 2019 31 Mar 2019 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 01 Mar 2019 31 Dec 2018 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 01 Mar 2019 31 Dec 2018 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 16 Jan 2019 31 Dec 2018 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 23 Oct 2018 30 Sep 2018 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 30 Jul 2018 30 Jun 2018 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 26 Apr 2018 31 Mar 2018 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 01 Mar 2018 31 Dec 2017 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 10 Jan 2018 31 Dec 2017 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 25 Oct 2017 30 Sep 2017 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 12 Jul 2017 30 Jun 2017 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 21 Apr 2017 31 Mar 2017 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 28 Feb 2017 31 Dec 2016 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 11 Jan 2017 31 Dec 2016 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 07 Oct 2016 30 Sep 2016 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 18 Jul 2016 30 Jun 2016 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 14 Apr 2016 31 Mar 2016 028-16834
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 24 Feb 2016 31 Dec 2015 008-68556
13F-HR Open 13F-HR document View SEC filing for 13F-HR 20 Jan 2016 31 Dec 2015 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 08 Oct 2015 30 Sep 2015 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 08 Jul 2015 30 Jun 2015 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 21 Apr 2015 31 Mar 2015 028-16834
13F-HR Open 13F-HR document View SEC filing for 13F-HR 04 Mar 2015 31 Dec 2014 028-16834
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 26 Feb 2015 31 Dec 2014 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 26 Feb 2015 31 Dec 2014 008-68556
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 28 Feb 2014 31 Dec 2013 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 28 Feb 2014 31 Dec 2013 008-68556
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 01 Mar 2013 31 Dec 2012 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 01 Mar 2013 31 Dec 2012 008-68556
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 29 Feb 2012 31 Dec 2011 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 29 Feb 2012 31 Dec 2011 008-68556
FOCUSN Open FOCUSN document View SEC filing for FOCUSN AUTO-GENERATED PAPER DOCUMENT 01 Mar 2011 31 Dec 2010 008-68556
X-17A-5 Open X-17A-5 document View SEC filing for X-17A-5 AUTO-GENERATED PAPER DOCUMENT 01 Mar 2011 31 Dec 2010 008-68556

About this filer

SIMPLEX TRADING, LLC files with the SEC under CIK 0001488542. This page aggregates EDGAR filings and related ownership activity.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.