NITHRAKASHYAP ARVIND (Chief Technology Officer) sold 7.7% of their position (28.97K shares) of RUBRIK, INC. on the open market

Open‑market sale worth $1.40M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

NITHRAKASHYAP ARVIND

Filed: 3/26/2026ACC: 0002019143-26-000007

InsiderNITHRAKASHYAP ARVINDCIK 2019143

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IssuerRUBRIK, INC.CIK 1943896

DirectorOfficer10% Owner· Chief Technology Officer

Since Apr 2024

-28.97K

Net shares

Net seller

$1.40M

Total sold

Open market trades

0B · 1S

Total transactions

81.25K acquired · 110.22K disposed

Non-Derivative Transactions2

Class A Common Stock

Direct

C · Conversion

+40.63K

Price / share

—

Trade value

—

% of position

12.1%

3/24/2026

337.01K→377.63K

Class A Common Stock

Direct

S · Sale

−28.97K

Price / share

$48.20

Trade value

$1.40M

% of position

7.7%

3/24/2026

377.63K→348.67K

Total

Net shares

+11.66K

Net value

-$1.40M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	3/24/2026	C · Conversion	+40.63K	—	—	12.1%	337.01K	377.63K
Class A Common Stock Direct	3/24/2026	S · Sale	−28.97K	$48.20	$1.40M	7.7%	377.63K	348.67K
Total			+11.66K		-$1.40M

Derivative Transactions3

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Class B Common Stock

40.63K shares

−40.63K

Strike price

Held after

0.00

Exercisable

—

3/24/2026

Class B Common Stock

Direct

M · Option Exercise

Converts to

Class A Common Stock

40.63K shares

+40.63K

Strike price

Held after

10.27M

Exercisable

—

3/24/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

40.63K shares

−40.63K

Strike price

Held after

10.23M

Exercisable

—

3/24/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Unit Direct	Class B Common Stock40.63K shares	3/24/2026	M · Option Exercise	−40.63K	—	0.00
Class B Common Stock Direct	Class A Common Stock40.63K shares	3/24/2026	M · Option Exercise	+40.63K	—	10.27M
Class B Common Stock Direct	Class A Common Stock40.63K shares	3/24/2026	C · Conversion	−40.63K	—	10.23M

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Class B Common Stock

Indirect

Underlying security

Class A Common Stock

Underlying shares

200K

Shares owned

200K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

200K

Owned

200K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Indirect	Class A Common Stock		—	—	200K	200K
Total					200K	200K