| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Lightspeed Venture Partners IX, L.P. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed Venture Partners IX, L.P., By: Lightspeed General Partner IX, L.P., its General Partner, By: Lightspeed Ultimate General Partner IX, Ltd., its General Partner, By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001539061 |
| Lightspeed General Partner IX, L.P. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed General Partner IX, L.P., By: Lightspeed Ultimate General Partner IX, Ltd., its General Partner, By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001913317 |
| Lightspeed Ultimate General Partner IX, Ltd. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed Ultimate General Partner IX, Ltd., By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001912676 |
| Lightspeed Venture Partners Select II, L.P. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed Venture Partners Select II, L.P., By: Lightspeed General Partner Select II, L.P., its General Partner, By: Lightspeed Ultimate General Partner Select II, Ltd., its General Partner, By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001668017 |
| Lightspeed General Partner Select II, L.P. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed General Partner Select II, L.P., By: Lightspeed Ultimate General Partner Select II, Ltd., its General Partner, By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001744936 |
| Lightspeed Ultimate General Partner Select II, Ltd. | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed Ultimate General Partner Select II, Ltd., By /s/ Ravi Mhatre, Director | 30 Jun 2025 | 0001744937 |
| Lightspeed SPV I, LLC | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed SPV I, LLC, By: LS SPV Management, LLC, its Manager, By /s/ Ravi Mhatre, Managing Member | 30 Jun 2025 | 0001703140 |
| Lightspeed SPV I-B, LLC | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed SPV I-B, LLC, By: LS SPV Management, LLC, its Manager, By /s/ Ravi Mhatre, Managing Member | 30 Jun 2025 | 0001759394 |
| Lightspeed SPV I-C, LLC | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | Lightspeed SPV I-C, LLC, By: LS SPV Management, LLC, its Manager, By /s/ Ravi Mhatre, Managing Member | 30 Jun 2025 | 0001827893 |
| LS SPV Management, LLC | 10%+ Owner | 2200 SAND HILL ROAD, MENLO PARK | LS SPV Management, LLC, By /s/ Ravi Mhatre, Managing Member | 30 Jun 2025 | 0001978139 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +4,440,000 | $0.000000 | 4,440,000 | 26 Jun 2025 | Direct | F1 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +1,031,000 | $0.000000 | 1,031,000 | 26 Jun 2025 | By Lightspeed Venture Partners Select II, L.P. | F2 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +2,004,000 | $0.000000 | 2,004,000 | 26 Jun 2025 | By Lightspeed SPV I, LLC | F3 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +1,274,000 | $0.000000 | 1,274,000 | 26 Jun 2025 | By Lightspeed SPV I-B, LLC | F4 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +892,000 | $0.000000 | 892,000 | 26 Jun 2025 | By Lightspeed SPV I-C, LLC | F5 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -4,440,000 | -100% | $0.000000 | 0 | 26 Jun 2025 | Direct | F1, F6 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +1,159,950 | $0.000000 | 1,159,950 | 26 Jun 2025 | By Lightspeed General Partner IX, L.P. | F7, F8 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -1,159,950 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed General Partner IX, L.P. | F8, F9 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -1,031,000 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed Venture Partners Select II, L.P. | F2, F10 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +218,572 | $0.000000 | 218,572 | 26 Jun 2025 | By Lightspeed General Partner Select II, L.P. | F11, F12 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -218,572 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed General Partner Select II, L.P. | F12, F13 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -2,004,000 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed SPV I, LLC | F3, F14 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -1,274,000 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed SPV I-B, LLC | F4, F15 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -892,000 | -100% | $0.000000 | 0 | 26 Jun 2025 | By Lightspeed SPV I-C, LLC | F5, F16 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +400,800 | $0.000000 | 400,800 | 26 Jun 2025 | By LS SPV Management, LLC | F17, F18 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -400,800 | -100% | $0.000000 | 0 | 26 Jun 2025 | By LS SPV Management, LLC | F18, F19 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +16,984 | $0.000000 | 16,984 | 26 Jun 2025 | By Lightspeed Management Company, L.L.C. | F20, F21, F22 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | +37,961 | +179% | $0.000000 | 59,182 | 26 Jun 2025 | Direct | F23, F24 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +166,963 | +88% | $0.000000 | 356,242 | 26 Jun 2025 | By Eggers Investments LP - Fund 2 | F20, F21, F25 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +37,961 | +179% | $0.000000 | 59,182 | 26 Jun 2025 | Direct | F23, F26 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +146,773 | +59% | $0.000000 | 396,874 | 26 Jun 2025 | By Nieh Family Investments LP - Fund 2 | F20, F27 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +20,190 | +67% | $0.000000 | 50,331 | 26 Jun 2025 | By Nieh Family Investments LP - Fund 4 | F21, F28 |
| holding | RBRK | Class A Common Stock | 649 | 26 Jun 2025 | By Nieh Family Investments LP - Fund 1 | F29 | |||||
| holding | RBRK | Class A Common Stock | 8,387 | 26 Jun 2025 | By Nieh Family Investments LP - Fund 3 | F30 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -4,440,000 | -44% | $0.000000 | 5,549,816 | 26 Jun 2025 | Class A Common Stock | 4,440,000 | Direct | F1, F31 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -1,031,000 | -44% | $0.000000 | 1,288,410 | 26 Jun 2025 | Class A Common Stock | 1,031,000 | By Lightspeed Venture Partners Select II, L.P. | F2, F31 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -2,004,000 | -44% | $0.000000 | 2,507,457 | 26 Jun 2025 | Class A Common Stock | 2,004,000 | By Lightspeed SPV I, LLC | F3, F31 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -1,274,000 | -39% | $0.000000 | 1,973,511 | 26 Jun 2025 | Class A Common Stock | 1,274,000 | By Lightspeed SPV I-B, LLC | F4, F31 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -892,000 | -39% | $0.000000 | 1,381,358 | 26 Jun 2025 | Class A Common Stock | 892,000 | By Lightspeed SPV I-C, LLC | F5, F31 | |
| holding | RBRK | Class B Common Stock | 101,659 | 26 Jun 2025 | Class A Common Stock | 101,659 | By Lightspeed Venture Partners X, L.P. | F31, F32 |
| Id | Content |
|---|---|
| F1 | Shares are held by Lightspeed Venture Partners IX, L.P. ("Lightspeed IX"). Lightspeed General Partner IX, L.P. ("LGP IX") is the general partner of Lightspeed IX. Lightspeed Ultimate General Partner IX, Ltd. ("LUGP IX") is the general partner of LGP IX. Barry Eggers, Ravi Mhatre and Peter Nieh are the directors of LUGP IX and share voting and dispositive power with respect to the shares held by Lightspeed IX. Each of LGP IX, LUGP IX and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F2 | Shares are held by Lightspeed Venture Partners Select II, L.P. ("Lightspeed Select II"). Lightspeed General Partner Select II, L.P. ("LGP Select II") is the general partner of Lightspeed Select II. Lightspeed Ultimate General Partner Select II, Ltd. ("LUGP Select II") is the general partner of LGP Select II. Barry Eggers, Ravi Mhatre and Peter Nieh are the directors of LUGP Select II and share voting and dispositive power with respect to the shares held by Lightspeed Select II. Each of LGP Select II, LUGP Select II and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F3 | Shares are held by Lightspeed SPV I, LLC ("Lightspeed SPV I"). LS SPV Management, LLC ("LS SPV") is the manager of Lightspeed SPV I. Barry Eggers, Ravi Mhatre and Peter Nieh are the managing members of LS SPV and share voting and dispositive power with respect to the shares held by Lightspeed SPV I. Each of LS SPV and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F4 | Shares are held by Lightspeed SPV I-B, LLC ("Lightspeed SPV I-B"). LS SPV is the manager of Lightspeed SPV I-B. Barry Eggers, Ravi Mhatre, and Peter Nieh are the managing members of LS SPV and share voting and dispositive power with respect to the shares held by Lightspeed SPV I-B. Each of LS SPV and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F5 | Shares are held by Lightspeed SPV I-C, LLC ("Lightspeed SPV I-C"). LS SPV is the manager of Lightspeed SPV I-C. Barry Eggers, Ravi Mhatre, and Peter Nieh are the managing members of LS SPV and share voting and dispositive power with respect to the shares held by Lightspeed SPV I-C. Each of LS SPV and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F6 | Represents an in-kind distribution by Lightspeed IX without consideration to its partners (including LGP IX). |
| F7 | Represents receipt of shares in the distribution in kind described in footnote (6). |
| F8 | Shares are held by LGP IX. LUGP IX is the general partner of LGP IX. Barry Eggers, Ravi Mhatre and Peter Nieh are the directors of LUGP IX and share voting and dispositive power with respect to the shares held by LGP IX. Each of LUGP IX and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F9 | Represents an in-kind distribution by LGP IX without consideration to its partners. |
| F10 | Represents an in-kind distribution by Lightspeed Select II without consideration to its partners (including LGP Select II). |
| F11 | Represents receipt of shares in the distribution in kind described in footnote (10). |
| F12 | Shares are held by LGP Select II. LUGP Select II is the general partner of LGP Select II. Barry Eggers, Ravi Mhatre and Peter Nieh are the directors of LUGP Select II and share voting and dispositive power with respect to the shares held by LGP Select II. Each of LUGP Select II and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F13 | Represents an in-kind distribution by LGP Select II without consideration to its partners. |
| F14 | Represents an in-kind distribution by Lightspeed SPV I without consideration to its members (including LS SPV). |
| F15 | Represents an in-kind distribution by Lightspeed SPV I-B without consideration to its members. |
| F16 | Represents an in-kind distribution by Lightspeed SPV I-C without consideration to its members. |
| F17 | Represents receipt of shares in the distribution in kind described in footnote (14). |
| F18 | Shares are held by LS SPV. Barry Eggers, Ravi Mhatre and Peter Nieh are the managing members of LS SPV and share voting and dispositive power with respect to the shares held by LS SPV. Each of Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F19 | Represents an in-kind distribution by LS SPV without consideration to its members. |
| F20 | Represents receipt of shares in the distribution in kind described in footnote (9). |
| F21 | Represents receipt of shares in the distribution in kind described in footnote (13). |
| F22 | Shares are held by Lightspeed Management Company, L.L.C. ("LMC"). Barry Eggers, Ravi Mhatre, and Peter Nieh are managing members of LMC and share voting and dispositive power with respect to the shares held by LMC. Each of Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
| F23 | Represents receipt of shares in the distribution in kind described in footnote (19). |
| F24 | Shares are held by Barry Eggers. |
| F25 | Barry Eggers serves as trustee of the general partner of Eggers Investments LP - Fund 2. |
| F26 | Shares are held by Peter Nieh. |
| F27 | Peter Nieh serves as co-trustee of the general partner of Nieh Family Investments LP - Fund 2. |
| F28 | Peter Nieh serves as co-trustee of the general partner of Nieh Family Investments LP - Fund 4. |
| F29 | Peter Nieh serves as co-trustee of the general partner of Nieh Family Investments LP - Fund 1. |
| F30 | Peter Nieh serves as co-trustee of the general partner of Nieh Family Investments LP - Fund 3. |
| F31 | Each share of Class B Common Stock 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 holder into one share of Class A Common Stock. |
| F32 | Shares are held by Lightspeed Venture Partners X, L.P. ("Lightspeed X"). Lightspeed General Partner X, L.P. ("LGP X") is the general partner of Lightspeed X. Lightspeed Ultimate General Partner X, Ltd. ("LUGP X") is the general partner of LGP X. Barry Eggers, Ravi Mhatre, and Peter Nieh are the directors of LUGP X and share voting and dispositive power with respect to the shares held by Lightspeed X. Each of LGP X, LUGP X and Messrs. Eggers and Nieh disclaims beneficial ownership of these shares except to the extent of its or his respective pecuniary interest therein. Mr. Mhatre is a director of the Issuer and files separate Section 16 reports. |
This Form 4 is the first of two Forms 4 filed relating to the same events. Combined, the two Form 4s report transactions for the following Reporting Persons: Lightspeed Venture Partners IX, L.P., Lightspeed General Partner IX, L.P., Lightspeed Ultimate General Partner IX, Ltd., Lightspeed SPV I, LLC, Lightspeed SPV I-B, LLC, Lightspeed SPV I-C, LLC, LS SPV Management, LLC, Lightspeed Venture Partners Select II, L.P., Lightspeed General Partner Select II, L.P., Lightspeed Ultimate General Partner Select II, Ltd., Barry Eggers and Peter Nieh. This Form 4 has been split into two filings because there are more than 10 reporting persons in total, and the SEC's EDGAR filing system limits a single Form 4 to a maximum of 10 reporting persons.