(DNTH)

Reporting relationship: EVP, Head of R&D
Issuer ticker: DNTH
Reported as of: 01 Sep 2026
Net transaction value: -$2,460,690
SEC form: 4
Accepted by SEC: 03 Sep 2026, 16:30:11 UTC
Prior SEC filing: 02 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Adam Veness, as attorney-in-fact for Simrat Randhawa

Key filing fact

Simrat Randhawa filed Form 4 for Dianthus Therapeutics, Inc. /DE/ (DNTH) on 03 Sep 2026.

Key facts

This page summarizes Simrat Randhawa's Form 4 filing for Dianthus Therapeutics, Inc. /DE/ (DNTH).
9 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 03 Sep 2026, 16:30.

Change

Previous filing in this sequence was filed on 02 Jun 2026.
Current net transaction value: -$2,460,690.

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 0001992260 Primary reporting owner

Randhawa Simrat

Relationship: EVP, Head of R&D
Address: C/O DIANTHUS THERAPEUTICS, INC., 7 TIMES SQUARE, 43RD FLOOR, NEW YORK
Signature: /s/ Adam Veness, as attorney-in-fact for Simrat Randhawa
Signature date: 03 Sep 2026

Reported non-derivative transactions

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

DNTH transaction

Common Stock

Options Exercise

Transaction value
Shares: +7,500
Change %: +188%
Price: $17.88^*
Shares after: 11,500
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1

DNTH transaction

Common Stock

Options Exercise

Transaction value
Shares: +6,249
Change %: +54%
Price: $21.77^*
Shares after: 17,749
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1

DNTH transaction

Common Stock

Options Exercise

Transaction value
Shares: +9,375
Change %: +53%
Price: $22.07^*
Shares after: 27,124
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1

DNTH transaction

Common Stock

Sale

Transaction value: $273,494
Shares: -2,600
Change %: -9.6%
Price: $105.19
Shares after: 24,524
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1, F2

DNTH transaction

Common Stock

Sale

Transaction value: $766,594
Shares: -7,215
Change %: -29%
Price: $106.25
Shares after: 17,309
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1, F3

DNTH transaction

Common Stock

Sale

Transaction value: $1,420,603
Shares: -13,309
Change %: -77%
Price: $106.74
Shares after: 4,000
Date: 01 Sep 2026
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

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

DNTH transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -7,500
Change %: -12%
Price: $0.000000^*
Shares after: 56,776
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,500
Exercise price: $17.88
Footnotes: F1, F5

DNTH transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -6,249
Change %: -13%
Price: $0.000000^*
Shares after: 41,676
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,249
Exercise price: $21.77
Footnotes: F1, F6

DNTH transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -9,375
Change %: -9.7%
Price: $0.000000^*
Shares after: 87,500
Date: 01 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 9,375
Exercise price: $22.07
Footnotes: F1, F7

^* 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 7 footnotes

Footnote F1

This transaction was executed pursuant to a Rule 10b5-1 trading plan adopted on August 14, 2025.

Footnote F2

The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $104.50 to $105.46, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range.

Footnote F3

The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $105.53 to $106.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range.

Footnote F4

The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $106.53 to $107.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range.

Footnote F5

The shares of common stock underlying this stock option award vest in equal monthly installments over the four years after January 1, 2024, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

Footnote F6

The shares of common stock underlying this stock option award vest in equal monthly installments over the four years after May 1, 2024, subject to the Reporting Person's continued service to the Issuer on each such vesting date.

Footnote F7

The shares of common stock underlying this stock option award vest in equal monthly installments over the four years after January 1, 2025, subject to the Reporting Person's continued service to the Issuer on each such vesting date.