RBRK Rule 144 Notice: 31,809 Shares Proposed Sale via Morgan Stanley

Rhea-AI Filing Summary

Rubrik, Inc. (RBRK) Form 144 notice reports a proposed sale of 31,809 common shares by an affiliate through Morgan Stanley Smith Barney, with an aggregate market value of $2,462,989.96. The shares represent a small fraction of the issuer's reported 142,085,609 outstanding shares and are scheduled for sale on 09/12/2025. The filer states the shares were acquired in a private transaction from the issuer on 03/04/2015 and that full payment was made on that date. The filing also discloses a prior sale by Greylock Management Corporation of 36,072 shares on 06/17/2025 for gross proceeds of $3,253,283.18. The signer certifies no undisclosed material adverse information.

Insights

Securities Analyst

Insider-affiliate sales disclosed; size appears immaterial to capitalization.

The Form 144 notifies the market of a proposed sale of 31,809 shares valued at about $2.46 million, alongside a recent sale of 36,072 shares that generated $3.25 million. Relative to the stated 142.1 million shares outstanding, these transactions represent de minimis ownership turnover (~0.02% each). For investors, such filings increase transparency about insider or affiliate liquidity but do not by themselves indicate material change to the company’s capitalization or operations.

Corporate Governance Expert

Routine Rule 144 disclosure; emphasizes compliance and market transparency.

The notice documents compliance with Rule 144 reporting requirements, including acquisition history and broker details. The seller affirms absence of undisclosed material information and notes the shares were acquired in 2015 from the issuer. Given the modest share counts relative to outstanding shares, this appears to be a routine liquidity event rather than a governance red flag, though repeated or larger insider dispositions could warrant closer scrutiny.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	31809	2462989.96	142085609	09/12/2025	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	03/04/2015	Private Acquisition from Issuer/Affiliate	Issuer			31809	03/04/2015	Not Applicable

* 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
GREYLOCK MANAGEMENT CORPORATION 3495 Deer Creek Road Palo Alto CA 94304	Common	06/17/2025	36072	3253283.18

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for RBRK disclose?

The Form 144 discloses a proposed sale of 31,809 common shares valued at $2,462,989.96 through Morgan Stanley Smith Barney and a prior sale of 36,072 shares on 06/17/2025 for $3,253,283.18.

When were the shares proposed for sale acquired?

The filing states the 31,809 shares were acquired in a private acquisition from the issuer on 03/04/2015 and fully paid for on that date.

How large are these sales relative to Rubrik's outstanding shares?

The filing lists 142,085,609 shares outstanding; the proposed sale of 31,809 shares is a very small percentage (~0.02%) of that total.

Who is the executing broker named in the filing?

The broker identified for the proposed sale is Morgan Stanley Smith Barney LLC, Executive Financial Services, 1 New York Plaza, New York, NY.

Does the filer represent there is undisclosed material information?

By signing the notice, the person for whose account the securities will be sold represents they do not know any material adverse information about the issuer that has not been publicly disclosed.