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$ Value

$0

Shares

40,625

Price

$0

Filed

Sep 18

Insider

Name

Nithrakashyap Arvind

Title

Chief Technology Officer

CIK

0002019143

Roles

Director Officer

Transaction Details

Transaction Date

2025-09-16

Code

M

Table

Derivative

Ownership

Direct

Equity Swap

No

Shares After

10,371,570

Footnotes

This sale reported on this Form 4 was effected pursuant to the Issuer's policy requiring sell-to-cover to satisfy certain tax obligations of the Reporting Person incurred with the vesting and settlement of certain Restricted Stock Units (RSUs). | Each RSU represents a contingent right to receive one share of Class B Common Stock. | The shares of Class B Common Stock are to be acquired upon the vesting of an RSU award previously granted to the Reporting Person. The RSUs shall vest as follows: 1/16 of the shares subject to the RSU vest in sixteen equal quarterly installments measured from January 27, 2022 and the Issuer's achievement of a specified average price per share prior to the earlier of (i) the five year anniversary of the effectiveness of the registration statement on Form S-1 filed by the Issuer in connection with the Issuer's initial public offering and (ii) the expiration of the RSU award, subject to the Reporting Person continuing to have a Service Relationship (as defined in the Issuer's Amended and Restated 2014 Stock Option and Grant Plan) as a full time employee of the Issuer on each such date. | Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock is also convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. | The shares are held of record by Arvind Nithrakashyap, as Trustee of the Nithrakashyap/Chatterjee Revocable Trust, for which the Reporting Person serves as trustee and shares voting and dispositive power with his spouse.

Filing Info

Accession No.

0002019143-25-000006

Form Type

4

Issuer CIK

0001943896

Nithrakashyap Arvind's History

Date Ticker Type Value
2026-04-14 RBRK A $0
2026-03-24 RBRK C $0
2026-03-24 RBRK $1.4M
2026-03-24 RBRK M $0
2026-03-24 RBRK M $0
2026-03-24 RBRK C $0
2026-01-15 RBRK $327K
2026-01-14 RBRK $73K
2025-12-23 RBRK C $0
2025-12-23 RBRK G $0

Other Insiders at RBRK (90d)

Insider Bought Sold Last
MCLAUGHLIN MARK D $502K 2026-03-30
THOMPSON JOHN WENDELL $2.1M 2026-04-01
Nithrakashyap Arvind
Chief Technology Officer
$1.4M 2026-04-14
McCarthy Brian K.
Pres.,Global Sales & Field Ops
2026-01-31
Choudary Kiran Kumar
Chief Financial Officer
$8.0M 2026-04-14