NITHRAKASHYAP ARVIND (Chief Technology Officer) sold 12.4% of their position (38.46K shares) of RUBRIK, INC. on the open market

Open‑market sale worth $4.78M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 14 sales

NITHRAKASHYAP ARVIND

Filed: 10/7/2026ACC: 0002019143-26-000023

InsiderNITHRAKASHYAP ARVINDCIK 2019143

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IssuerRUBRIK, INC.CIK 1943896

DirectorOfficer10% Owner· Chief Technology Officer

Since Apr 2024

-38.46K

Net shares

Net seller

$4.78M

Total sold

Open market trades

0B · 14S

Total transactions

28.14K acquired · 66.60K disposed

Non-Derivative Transactions17

Class A Common Stock

Direct

C · Conversion

+2.50K

Price / share

—

Trade value

—

% of position

0.9%

10/5/2026

282.86K→285.36K

Class A Common Stock

Direct

S · Sale

−495.00

Price / share

$118.92

Trade value

$58.87K

% of position

0.2%

10/5/2026

285.36K→284.86K

Class A Common Stock

Direct

S · Sale

−110.00

Price / share

$120.26

Trade value

$13.23K

% of position

0.0%

10/5/2026

284.86K→284.75K

Class A Common Stock

Direct

S · Sale

−901.00

Price / share

$121.20

Trade value

$109.20K

% of position

0.3%

10/5/2026

284.75K→283.85K

Class A Common Stock

Direct

S · Sale

−2.80K

Price / share

$121.95

Trade value

$341.58K

% of position

1.0%

10/5/2026

283.85K→281.05K

Class A Common Stock

Direct

S · Sale

−5.60K

Price / share

$122.99

Trade value

$688.74K

% of position

2.0%

10/5/2026

281.05K→275.45K

Class A Common Stock

Direct

S · Sale

−2.91K

Price / share

$123.80

Trade value

$360.63K

% of position

1.1%

10/5/2026

275.45K→272.54K

Class A Common Stock

Direct

C · Conversion

+12.82K

Price / share

—

Trade value

—

% of position

4.7%

10/6/2026

272.54K→285.36K

Class A Common Stock

Direct

S · Sale

−582.00

Price / share

$125.35

Trade value

$72.95K

% of position

0.2%

10/6/2026

285.36K→284.78K

Class A Common Stock

Direct

S · Sale

−11.10K

Price / share

$126.14

Trade value

$1.40M

% of position

3.9%

10/6/2026

284.78K→273.68K

Class A Common Stock

Direct

S · Sale

−1.07K

Price / share

$126.87

Trade value

$135.62K

% of position

0.4%

10/6/2026

273.68K→272.61K

Class A Common Stock

Direct

S · Sale

−68.00

Price / share

$127.70

Trade value

$8.68K

% of position

0.0%

10/6/2026

272.61K→272.54K

Class A Common Stock

Direct

C · Conversion

+12.82K

Price / share

—

Trade value

—

% of position

4.7%

10/7/2026

272.54K→285.36K

Class A Common Stock

Direct

S · Sale

−1.48K

Price / share

$123.32

Trade value

$182.27K

% of position

0.5%

10/7/2026

285.36K→283.88K

Class A Common Stock

Direct

S · Sale

−8.27K

Price / share

$124.05

Trade value

$1.03M

% of position

2.9%

10/7/2026

283.88K→275.61K

Class A Common Stock

Direct

S · Sale

−3.06K

Price / share

$124.79

Trade value

$381.23K

% of position

1.1%

10/7/2026

275.61K→272.55K

Class A Common Stock

Direct

S · Sale

−13.00

Price / share

$125.57

Trade value

$1.63K

% of position

0.0%

10/7/2026

272.55K→272.54K

Total

Net shares

−10.32K

Net value

-$4.78M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	10/5/2026	C · Conversion	+2.50K	—	—	0.9%	282.86K	285.36K
Class A Common Stock Direct	10/5/2026	S · Sale	−495.00	$118.92	$58.87K	0.2%	285.36K	284.86K
Class A Common Stock Direct	10/5/2026	S · Sale	−110.00	$120.26	$13.23K	0.0%	284.86K	284.75K
Class A Common Stock Direct	10/5/2026	S · Sale	−901.00	$121.20	$109.20K	0.3%	284.75K	283.85K
Class A Common Stock Direct	10/5/2026	S · Sale	−2.80K	$121.95	$341.58K	1.0%	283.85K	281.05K
Class A Common Stock Direct	10/5/2026	S · Sale	−5.60K	$122.99	$688.74K	2.0%	281.05K	275.45K
Class A Common Stock Direct	10/5/2026	S · Sale	−2.91K	$123.80	$360.63K	1.1%	275.45K	272.54K
Class A Common Stock Direct	10/6/2026	C · Conversion	+12.82K	—	—	4.7%	272.54K	285.36K
Class A Common Stock Direct	10/6/2026	S · Sale	−582.00	$125.35	$72.95K	0.2%	285.36K	284.78K
Class A Common Stock Direct	10/6/2026	S · Sale	−11.10K	$126.14	$1.40M	3.9%	284.78K	273.68K
Class A Common Stock Direct	10/6/2026	S · Sale	−1.07K	$126.87	$135.62K	0.4%	273.68K	272.61K
Class A Common Stock Direct	10/6/2026	S · Sale	−68.00	$127.70	$8.68K	0.0%	272.61K	272.54K
Class A Common Stock Direct	10/7/2026	C · Conversion	+12.82K	—	—	4.7%	272.54K	285.36K
Class A Common Stock Direct	10/7/2026	S · Sale	−1.48K	$123.32	$182.27K	0.5%	285.36K	283.88K
Class A Common Stock Direct	10/7/2026	S · Sale	−8.27K	$124.05	$1.03M	2.9%	283.88K	275.61K
Class A Common Stock Direct	10/7/2026	S · Sale	−3.06K	$124.79	$381.23K	1.1%	275.61K	272.55K
Class A Common Stock Direct	10/7/2026	S · Sale	−13.00	$125.57	$1.63K	0.0%	272.55K	272.54K
Total			−10.32K		-$4.78M

Derivative Transactions3

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

2.50K shares

−2.50K

Strike price

Held after

10.03M

Exercisable

—

10/5/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

12.82K shares

−12.82K

Strike price

Held after

10.01M

Exercisable

—

10/6/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

12.82K shares

−12.82K

Strike price

Held after

10M

Exercisable

—

10/7/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Class B Common Stock Direct	Class A Common Stock2.50K shares	10/5/2026	C · Conversion	−2.50K	—	10.03M
Class B Common Stock Direct	Class A Common Stock12.82K shares	10/6/2026	C · Conversion	−12.82K	—	10.01M
Class B Common Stock Direct	Class A Common Stock12.82K shares	10/7/2026	C · Conversion	−12.82K	—	10M

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