SAVITZ RYAN (EVP, CFO & CBO) sold 114.37K shares of DIANTHUS THERAPEUTICS, INC. /DE/ on the open market

Open‑market sale worth $9.49M. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 8 sales

SAVITZ RYAN

Filed: 4/1/2026ACC: 0001992324-26-000004

InsiderSAVITZ RYANCIK 1992324

→

IssuerDIANTHUS THERAPEUTICS, INC. /DE/CIK 1690585

Officer· EVP, CFO & CBO

Since Feb 2026

-114.37K

Net shares

Net seller

$9.49M

Total sold

Open market trades

0B · 8S

Total transactions

114.37K acquired · 228.73K disposed

Non-Derivative Transactions10

Common Stock

Direct

M · Option Exercise

+74.37K

Price / share

$8.44

Trade value

$627.66K

% of position

New position

3/31/2026

0.00→74.37K

Common Stock

Direct

M · Option Exercise

+40K

Price / share

$17.88

Trade value

$715.20K

% of position

53.8%

3/31/2026

74.37K→114.37K

Common Stock

Direct

S · Sale

−1.39K

Price / share

$78.33

Trade value

$108.88K

% of position

1.2%

3/31/2026

114.37K→112.98K

Common Stock

Direct

S · Sale

−21.82K

Price / share

$78.86

Trade value

$1.72M

% of position

19.3%

3/31/2026

112.98K→91.15K

Common Stock

Direct

S · Sale

−1.49K

Price / share

$80.25

Trade value

$119.17K

% of position

1.6%

3/31/2026

91.15K→89.67K

Common Stock

Direct

S · Sale

−800.00

Price / share

$81.36

Trade value

$65.09K

% of position

0.9%

3/31/2026

89.67K→88.87K

Common Stock

Direct

S · Sale

−2.37K

Price / share

$82.84

Trade value

$196K

% of position

2.7%

3/31/2026

88.87K→86.50K

Common Stock

Direct

S · Sale

−59.80K

Price / share

$83.90

Trade value

$5.02M

% of position

69.1%

3/31/2026

86.50K→26.70K

Common Stock

Direct

S · Sale

−19.47K

Price / share

$84.57

Trade value

$1.65M

% of position

72.9%

3/31/2026

26.70K→7.23K

Common Stock

Direct

S · Sale

−7.23K

Price / share

$85.54

Trade value

$618.63K

% of position

New position

3/31/2026

7.23K→0.00

Total

Net shares

+0.00

Net value

-$8.15M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/31/2026	M · Option Exercise	+74.37K	$8.44	$627.66K	New position	0.00	74.37K
Common Stock Direct	3/31/2026	M · Option Exercise	+40K	$17.88	$715.20K	53.8%	74.37K	114.37K
Common Stock Direct	3/31/2026	S · Sale	−1.39K	$78.33	$108.88K	1.2%	114.37K	112.98K
Common Stock Direct	3/31/2026	S · Sale	−21.82K	$78.86	$1.72M	19.3%	112.98K	91.15K
Common Stock Direct	3/31/2026	S · Sale	−1.49K	$80.25	$119.17K	1.6%	91.15K	89.67K
Common Stock Direct	3/31/2026	S · Sale	−800.00	$81.36	$65.09K	0.9%	89.67K	88.87K
Common Stock Direct	3/31/2026	S · Sale	−2.37K	$82.84	$196K	2.7%	88.87K	86.50K
Common Stock Direct	3/31/2026	S · Sale	−59.80K	$83.90	$5.02M	69.1%	86.50K	26.70K
Common Stock Direct	3/31/2026	S · Sale	−19.47K	$84.57	$1.65M	72.9%	26.70K	7.23K
Common Stock Direct	3/31/2026	S · Sale	−7.23K	$85.54	$618.63K	New position	7.23K	0.00
Total			+0.00		-$8.15M

Derivative Transactions2

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

74.37K shares

−74.37K

Strike price

8.44

Held after

10.40K

Exercisable

—

3/31/2026

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

40K shares

−40K

Strike price

17.88

Held after

80K

Exercisable

—

3/31/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock74.37K shares	3/31/2026	M · Option Exercise	−74.37K	8.44	—	10.40K
Stock Option (Right to Buy) Direct	Common Stock40K shares	3/31/2026	M · Option Exercise	−40K	17.88	—	80K