CHOUDARY KIRAN KUMAR (Chief Financial Officer) sold 17.8% of their position (122.61K shares) of RUBRIK, INC. on the open market

Open‑market sale worth $5.91M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

CHOUDARY KIRAN KUMAR

Filed: 3/26/2026ACC: 0002020220-26-000010

InsiderCHOUDARY KIRAN KUMARCIK 2020220

→

IssuerRUBRIK, INC.CIK 1943896

Officer· Chief Financial Officer

Since Feb 2026

-122.61K

Net shares

Net seller

$5.91M

Total sold

Open market trades

0B · 1S

Total transactions

424.38K acquired · 546.99K disposed

Non-Derivative Transactions2

Class A Common Stock

Direct

C · Conversion

+212.19K

Price / share

—

Trade value

—

% of position

44.6%

3/24/2026

475.33K→687.51K

Class A Common Stock

Direct

S · Sale

−122.61K

Price / share

$48.20

Trade value

$5.91M

% of position

17.8%

3/24/2026

687.51K→564.90K

Total

Net shares

+89.58K

Net value

-$5.91M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	3/24/2026	C · Conversion	+212.19K	—	—	44.6%	475.33K	687.51K
Class A Common Stock Direct	3/24/2026	S · Sale	−122.61K	$48.20	$5.91M	17.8%	687.51K	564.90K
Total			+89.58K		-$5.91M

Derivative Transactions5

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class B Common Stock

7.19K shares

−7.19K

Strike price

Held after

0.00

Exercisable

—

3/24/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class B Common Stock

150K shares

−150K

Strike price

Held after

200K

Exercisable

—

3/24/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class B Common Stock

55K shares

−55K

Strike price

Held after

192.50K

Exercisable

—

3/24/2026

Class B Common Stock

Direct

M · Option Exercise

Converts to

Class A Common Stock

212.19K shares

+212.19K

Strike price

Held after

212.19K

Exercisable

—

3/24/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

212.19K shares

−212.19K

Strike price

Held after

0.00

Exercisable

—

3/24/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Class B Common Stock7.19K shares	3/24/2026	M · Option Exercise	−7.19K	—	0.00
Restricted Stock Units Direct	Class B Common Stock150K shares	3/24/2026	M · Option Exercise	−150K	—	200K
Restricted Stock Units Direct	Class B Common Stock55K shares	3/24/2026	M · Option Exercise	−55K	—	192.50K
Class B Common Stock Direct	Class A Common Stock212.19K shares	3/24/2026	M · Option Exercise	+212.19K	—	212.19K
Class B Common Stock Direct	Class A Common Stock212.19K shares	3/24/2026	C · Conversion	−212.19K	—	0.00