Edward Carr - 12 Mar 2026 Form 4 Insider Report for Dianthus Therapeutics, Inc. /DE/ (DNTH)

Role
CHIEF ACCOUNTING OFFICER
Signature
/s/ Adam Veness, as attorney-in-fact for Edward Carr
Issuer symbol
DNTH
Transactions as of
12 Mar 2026
Net transactions value
-$3,559,495
Form type
4
Filing time
13 Mar 2026, 20:30:05 UTC
Previous filing
04 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
CARR EDWARD CHIEF ACCOUNTING OFFICER C/O DIANTHUS THERAPEUTICS, INC., 7 TIMES SQUARE, 43RD FLOOR, NEW YORK /s/ Adam Veness, as attorney-in-fact for Edward Carr 13 Mar 2026 0001273351

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction DNTH Common Stock Options Exercise +16,182 $17.88* 16,182 12 Mar 2026 Direct F1
transaction DNTH Common Stock Options Exercise +17,500 +108% $22.07* 33,682 12 Mar 2026 Direct F1
transaction DNTH Common Stock Options Exercise +10,000 +30% $21.77* 43,682 12 Mar 2026 Direct F1
transaction DNTH Common Stock Sale $1,279,415 -15,852 -36% $80.71 27,830 12 Mar 2026 Direct F1, F2
transaction DNTH Common Stock Sale $1,918,264 -23,465 -84% $81.75 4,365 12 Mar 2026 Direct F1, F3
transaction DNTH Common Stock Sale $319,481 -3,865 -89% $82.66 500 12 Mar 2026 Direct F1, F4
transaction DNTH Common Stock Sale $16,676 -200 -40% $83.38 300 12 Mar 2026 Direct F1
transaction DNTH Common Stock Sale $25,659 -300 -100% $85.53 0 12 Mar 2026 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction DNTH Stock Option (Right to Buy) Options Exercise -16,182 -20% $0.000000* 63,818 12 Mar 2026 Common Stock 16,182 $17.88 Direct F1, F5
transaction DNTH Stock Option (Right to Buy) Options Exercise -17,500 -29% $0.000000* 42,500 12 Mar 2026 Common Stock 17,500 $22.07 Direct F1, F6
transaction DNTH Stock Option (Right to Buy) Options Exercise -10,000 -17% $0.000000* 50,000 12 Mar 2026 Common Stock 10,000 $21.77 Direct F1, F7
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 11, 2025.
F2 The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $80.30 to $81.28, 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.
F3 The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $81.30 to $82.27, 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.
F4 The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $82.34 to $83.23, 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.
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.
F6 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.
F7 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.