RBRK holder plans sale of 33,000 shares via options

A shareholder of RBRK has filed to sell 33,000 shares of common stock, to be acquired through an exercise of stock options and sold for cash, with Morgan Stanley Smith Barney LLC Executive Financial Services as the broker on the NYSE.

Rhea-AI Filing Summary

A shareholder of RBRK has filed to sell 33,000 shares of common stock, to be acquired through an exercise of stock options and sold for cash, with Morgan Stanley Smith Barney LLC Executive Financial Services as the broker on the NYSE. The proposed sale date is August 3, 2026, with an aggregate market value of $2,387,880.00 for the shares to be sold.

The filing also lists prior Rule 10b5-1 plan sales during the past three months by John W. Thompson and the John and Sandra Thompson Trust, including multiple transactions of 2,500 and 11,000 shares of common stock on June 1, 2026 and July 1, 2026, with reported proceeds for each transaction.

Key Figures

Shares to be sold: 33,000 shares Aggregate market value: $2,387,880.00 Planned sale date: 08/03/2026 +4 more

7 metrics

Shares to be sold 33,000 shares Common stock proposed for sale following option exercise

Aggregate market value $2,387,880.00 Market value of 33,000 shares to be sold

Planned sale date 08/03/2026 Date for option exercise and proposed sale on NYSE

10b5-1 sale amount (Trust, 07/01/2026) 2,500 shares; $206,873.00 John and Sandra Thompson Trust 10b5-1 sale of common stock

10b5-1 sale amount (Thompson, 07/01/2026) 11,000 shares; $909,146.70 John W. Thompson 10b5-1 sale of common stock

10b5-1 sale amount (Trust, 06/01/2026) 2,500 shares; $211,274.50 John and Sandra Thompson Trust 10b5-1 sale of common stock

10b5-1 sale amount (Thompson, 06/01/2026) 11,000 shares; $930,026.90 John W. Thompson 10b5-1 sale of common stock

Key Terms

10b5-1, Exercise of Stock Options, Rule 144, aggregate market value

4 terms

10b5-1 regulatory

"10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST 3495 DEER CREEK ROAD"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 08/03/2026 | Exercise of Stock Options | Issuer"

Rule 144 regulatory

"144: Securities To Be Sold Common | 08/03/2026 | Exercise"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC ... | 33000 | 2387880.00"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What stock sale is being planned for RBRK under this Form 144?

A shareholder plans to sell 33,000 shares of RBRK common stock, to be acquired via an exercise of stock options and sold for cash, with an aggregate market value of $2,387,880.00 as of the filing.

When is the planned sale date for the 33,000 RBRK shares?

The planned sale date for the 33,000 RBRK shares is August 3, 2026. This date appears both as the option exercise date and the proposed sale date for the common stock on the NYSE.

Which broker is handling the planned RBRK stock sale?

The planned sale of 33,000 RBRK common shares will be handled by Morgan Stanley Smith Barney LLC Executive Financial Services, based at 1 New York Plaza, 8th Floor, New York, NY 10004, with trading reported on the NYSE.

What recent 10b5-1 sales related to RBRK are disclosed?

The filing discloses Rule 10b5-1 sales of RBRK common stock by John W. Thompson and the John and Sandra Thompson Trust on June 1, 2026 and July 1, 2026, including transactions of 2,500 and 11,000 shares with specified dollar proceeds.

How many RBRK shares did John W. Thompson sell under 10b5-1 plans?

John W. Thompson reported 10b5-1 sales of 11,000 RBRK common shares on June 1, 2026 for $930,026.90 and another 11,000 shares on July 1, 2026 for $909,146.70.

What 10b5-1 sales were made by the John and Sandra Thompson Trust in RBRK?

The John and Sandra Thompson Trust reported 10b5-1 sales of 2,500 RBRK shares on June 1, 2026 for $211,274.50 and another 2,500 shares on July 1, 2026 for $206,873.00.

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

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Available on EDGAR 08/03/2026 - 04:46 PM Accepted by SEC EDGAR 08/03/2026 - 04:46 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001207433
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	RUBRIK INC
SEC File Number	001-42028
Address of Issuer	3495 DEER CREEK ROAD Palo Alto CALIFORNIA 94304
Phone	8444782745
Name of Person for Whose Account the Securities are To Be Sold	JOHN THOMPSON
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	33000	2387880.00	160956763	08/03/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/03/2026	Exercise of Stock Options	Issuer			33000	08/03/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	07/01/2026	2500	206873.00
10b5-1 Sales for JOHN W THOMPSON 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	07/01/2026	11000	909146.70
10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	06/01/2026	2500	211274.50
10b5-1 Sales for JOHN W THOMPSON 3495 DEER CREEK ROAD Palo Alto CA 94304	Common	06/01/2026	11000	930026.90

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	08/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	10/06/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ John Thompson
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)