Mark L. Maurer - 14 Sep 2026 Form 4 Insider Report for StoneX Group Inc. (SNEX)

Reporting relationship: Chief Risk Officer
Issuer ticker: SNEX
Reported as of: 14 Sep 2026
Net transaction value: -$7,004,494
SEC form: 4
Accepted by SEC: 15 Sep 2026, 21:41:21 UTC
Prior SEC filing: 11 Aug 2026
Source filing: View source filing
Reporting owner signature: Mark L. Maurer

Key filing fact

Mark L. Maurer filed Form 4 for StoneX Group Inc. (SNEX) on 15 Sep 2026.

Key facts

This page summarizes Mark L. Maurer's Form 4 filing for StoneX Group Inc. (SNEX).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 15 Sep 2026, 21:41.

Change

Previous filing in this sequence was filed on 11 Aug 2026.
Current net transaction value: -$7,004,494.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001662210 Primary reporting owner

Maurer Mark Lowry

Relationship: Chief Risk Officer
Address: 230 SOUTH LASALLE, SUITE 10-500, CHICAGO
Signature: Mark L. Maurer
Signature date: 15 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SNEX transaction

Common Stock

Options Exercise

Transaction value
Shares: +69,372
Change %: +29%
Price: $8.90^*
Shares after: 306,336
Date: 14 Sep 2026
Ownership: Direct

SNEX transaction

Common Stock

Sale

Transaction value: $3,617,864
Shares: -52,564
Change %: -17%
Price: $68.83
Shares after: 253,772
Date: 14 Sep 2026
Ownership: Direct
Footnotes: F1

SNEX transaction

Common Stock

Sale

Transaction value: $3,386,629
Shares: -50,528
Change %: -20%
Price: $67.02
Shares after: 203,244
Date: 15 Sep 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SNEX transaction Derivative

Stock Options

Options Exercise

Transaction value
Shares: -69,372
Change %: -11%
Price: $0.000000^*
Shares after: 575,622
Date: 14 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 69,372
Exercise price: $8.90

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 1 footnote

Footnote F1

The price reported represents an average price. The Reporting Person will provide to the Commission, the issuer and any stockholder, upon request, full information regarding the number of shares sold at each separate price.