X0609 4 2026-08-10 0001690585 Dianthus Therapeutics, Inc. /DE/ DNTH 0001688199 Read Simon false C/O DIANTHUS THERAPEUTICS, INC. 7 TIMES SQUARE, 43RD FLOOR NEW YORK NY 10036 true false false false true Common Stock 2026-08-10 4 M false 2777 18.36 A 2777 D Common Stock 2026-08-10 4 S false 70 107.11 D 2707 D Common Stock 2026-08-10 4 S false 737 108.17 D 1970 D Common Stock 2026-08-10 4 S false 831 108.95 D 1139 D Common Stock 2026-08-10 4 S false 272 109.96 D 867 D Common Stock 2026-08-10 4 S false 470 111.05 D 397 D Common Stock 2026-08-10 4 S false 397 111.77 D 0 D Stock Option (Right to Buy) 18.36 2026-08-10 4 M false 2777 0 D 2035-05-22 Common Stock 2777 22223 D The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on May 8, 2026. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $106.50 to $107.27, 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. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $107.54 to $108.53, 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. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $108.54 to $109.54, 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. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $109.55 to $110.50, 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. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $110.56 to $111.56, 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. The price reported above is a weighted average price. The shares were sold in multiple transactions at prices ranging from $111.57 to $111.80, 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. The shares of common stock underlying this stock option award vest as to one-third of the shares subject to the option on each of the first, second and third anniversaries of the date of grant, subject to the Reporting Person's continued service to the Issuer on each such vesting date. /s/ Adam Veness, as attorney-in-fact for Simon Read 2026-08-11