GARCIA MARINO (CEO AND PRESIDENT) sold 71.8% of their position (166K shares) of DIANTHUS THERAPEUTICS, INC. /DE/ on the open market

Open‑market sale worth $17.95M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 7 sales

GARCIA MARINO

Filed: 8/7/2026ACC: 0001669866-26-000010

InsiderGARCIA MARINOCIK 1669866

→

IssuerDIANTHUS THERAPEUTICS, INC. /DE/CIK 1690585

DirectorOfficer· CEO AND PRESIDENT

Since Mar 2026

-166K

Net shares

Net seller

$17.95M

Total sold

Open market trades

0B · 7S

Total transactions

166K acquired · 332K disposed

Non-Derivative Transactions9

Common Stock

Direct

M · Option Exercise

+40K

Price / share

$8.44

Trade value

$337.60K

% of position

61.3%

8/7/2026

65.29K→105.29K

Common Stock

Direct

M · Option Exercise

+126K

Price / share

$8.44

Trade value

$1.06M

% of position

119.7%

8/7/2026

105.29K→231.29K

Common Stock

Direct

S · Sale

−10.38K

Price / share

$107.49

Trade value

$1.12M

% of position

4.5%

8/7/2026

231.29K→220.91K

Common Stock

Direct

S · Sale

−23.91K

Price / share

$108.05

Trade value

$2.58M

% of position

10.8%

8/7/2026

220.91K→197K

Common Stock

Direct

S · Sale

−2.37K

Price / share

$109.10

Trade value

$258.89K

% of position

1.2%

8/7/2026

197K→194.63K

Common Stock

Direct

S · Sale

−2.54K

Price / share

$110.02

Trade value

$279.01K

% of position

1.3%

8/7/2026

194.63K→192.09K

Common Stock

Direct

S · Sale

−800.00

Price / share

$110.76

Trade value

$88.61K

% of position

0.4%

8/7/2026

192.09K→191.29K

Common Stock

Direct

S · Sale

−104.09K

Price / share

$107.96

Trade value

$11.24M

% of position

54.4%

8/7/2026

191.19K→87.10K

Common Stock

Direct

S · Sale

−21.91K

Price / share

$108.72

Trade value

$2.38M

% of position

25.1%

8/7/2026

87.20K→65.29K

Total

Net shares

+0.00

Net value

-$16.54M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/7/2026	M · Option Exercise	+40K	$8.44	$337.60K	61.3%	65.29K	105.29K
Common Stock Direct	8/7/2026	M · Option Exercise	+126K	$8.44	$1.06M	119.7%	105.29K	231.29K
Common Stock Direct	8/7/2026	S · Sale	−10.38K	$107.49	$1.12M	4.5%	231.29K	220.91K
Common Stock Direct	8/7/2026	S · Sale	−23.91K	$108.05	$2.58M	10.8%	220.91K	197K
Common Stock Direct	8/7/2026	S · Sale	−2.37K	$109.10	$258.89K	1.2%	197K	194.63K
Common Stock Direct	8/7/2026	S · Sale	−2.54K	$110.02	$279.01K	1.3%	194.63K	192.09K
Common Stock Direct	8/7/2026	S · Sale	−800.00	$110.76	$88.61K	0.4%	192.09K	191.29K
Common Stock Direct	8/7/2026	S · Sale	−104.09K	$107.96	$11.24M	54.4%	191.19K	87.10K
Common Stock Direct	8/7/2026	S · Sale	−21.91K	$108.72	$2.38M	25.1%	87.20K	65.29K
Total			+0.00		-$16.54M

Derivative Transactions2

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

40K shares

−40K

Strike price

8.44

Held after

286K

Exercisable

—

8/7/2026

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

126K shares

−126K

Strike price

8.44

Held after

160K

Exercisable

—

8/7/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock40K shares	8/7/2026	M · Option Exercise	−40K	8.44	—	286K
Stock Option (Right to Buy) Direct	Common Stock126K shares	8/7/2026	M · Option Exercise	−126K	8.44	—	160K