Rubrik director lists no reportable share holdings

Rubrik, Inc. (RBRK) filed an initial statement of beneficial ownership (Form 3) for Rakefet Russak‑Aminoach, who is identified as a director of the company.

Rhea-AI Filing Summary

Rubrik, Inc. (RBRK) filed an initial statement of beneficial ownership (Form 3) for Rakefet Russak‑Aminoach, who is identified as a director of the company. The filing does not report any transactions or derivative positions and includes no holding entries for Rubrik securities at this time.

Key Figures

Buy transactions: 0 transactions Sell transactions: 0 transactions Holding entries: 0 entries +2 more

5 metrics

Buy transactions 0 transactions Initial Form 3 transaction summary for Rakefet Russak-Aminoach

Sell transactions 0 transactions Initial Form 3 transaction summary for Rakefet Russak-Aminoach

Holding entries 0 entries No reported Rubrik securities holdings on this Form 3

Derivative transactions 0 transactions No options or other derivatives reported in this filing

Net buy/sell shares 0 shares No net change in Rubrik share ownership reported on this Form 3

Key Terms

beneficial ownership, Form 3, derivative positions

3 terms

beneficial ownership regulatory

"filed an initial statement of beneficial ownership (Form 3) for"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Form 3 regulatory

"filed an initial statement of beneficial ownership (Form 3) for"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

derivative positions financial

"does not report any transactions or derivative positions and includes"

Derivative positions are contracts that derive their value from an underlying asset—such as a stock, bond, currency or commodity—and include instruments like options, futures and swaps. Think of them as bets or insurance tied to an asset’s future price: they let investors amplify returns, hedge risk or take exposure without owning the asset directly, which can meaningfully increase potential gains, losses and volatility in a portfolio.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 3 filing for RBRK disclose about Rakefet Russak-Aminoach?

It discloses that Rakefet Russak‑Aminoach is a director of Rubrik, Inc. The Form 3 reports no transactions, no holding entries, and no derivative positions in Rubrik securities as part of this initial beneficial ownership statement.

Does the RBRK Form 3 show any stock transactions by Rakefet Russak-Aminoach?

No. The Form 3 for Rubrik, Inc. shows zero reported transactions, with the transaction summary indicating 0 buy, 0 sell, and 0 acquire or dispose events, and no derivative transactions.

Are any Rubrik (RBRK) shares or options reported as held by Rakefet Russak-Aminoach?

No. The structured data show 0 holding entries and an empty derivative summary, meaning the Form 3 does not list any reportable Rubrik shares or derivative securities held by Rakefet Russak‑Aminoach in this filing.

What insider role is reported for Rakefet Russak-Aminoach at Rubrik (RBRK)?

The Form 3 identifies Rakefet Russak‑Aminoach as a director of Rubrik, Inc., with no officer title and not as a ten percent owner. This establishes her status as an insider subject to ongoing ownership reporting requirements.

Does the Rubrik (RBRK) Form 3 indicate use of a Rule 10b5-1 trading plan?

No. The Form 3 data show the Rule 10b5‑1 plan field as null, and there are no reported transactions and no footnote indications of trades made under a 10b5‑1 trading plan in this filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/28/2026 - 07:01 PM EDT Accepted by SEC EDGAR 08/28/2026 - 07:00 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Russak-Aminoach Rakefet

(Last) (First) (Middle)

C/O RUBRIK, INC.

3495 DEER CREEK ROAD

(Street)

PALO ALTO CALIFORNIA 94304

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
08/26/2026

3. Issuer Name and Ticker or Trading Symbol
Rubrik, Inc. [ RBRK ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

No securities are beneficially owned.

	/s/ Anne-Kathrin Lalendran, Attorney-in-Fact	08/28/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)