| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Mhatre Ravi | Director | 2200 SAND HILL ROAD, MENLO PARK | /s/ Ravi Mhatre | 15 Dec 2025 | 0001366050 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +1,387,454 | $0.000000 | 1,387,454 | 11 Dec 2025 | By Lightspeed Venture Partners IX, L.P. | F1 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +322,103 | $0.000000 | 322,103 | 11 Dec 2025 | By Lightspeed Venture Partners Select II, L.P. | F2 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +626,864 | $0.000000 | 626,864 | 11 Dec 2025 | By Lightspeed SPV I, LLC | F3 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +493,378 | $0.000000 | 493,378 | 11 Dec 2025 | By Lightspeed SPV I-B, LLC | F4 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +345,340 | $0.000000 | 345,340 | 11 Dec 2025 | By Lightspeed SPV I-C, LLC | F5 | |
| transaction | RBRK | Class A Common Stock | Conversion of derivative security | $0 | +101,659 | $0.000000 | 101,659 | 11 Dec 2025 | By Lightspeed Venture Partners X, L.P. | F6 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -1,387,454 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed Venture Partners IX, L.P. | F1, F7 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +362,473 | $0.000000 | 362,473 | 11 Dec 2025 | By Lightspeed General Partner IX, L.P. | F8, F9 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -362,473 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed General Partner IX, L.P. | F9, F10 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -322,103 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed Venture Partners Select II, L.P. | F2, F11 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +68,285 | $0.000000 | 68,285 | 11 Dec 2025 | By Lightspeed General Partner Select II, L.P. | F12, F13 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -68,285 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed General Partner Select II, L.P. | F13, F14 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -626,864 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed SPV I, LLC | F3, F15 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -493,378 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed SPV I-B, LLC | F4, F16 |
| transaction | RBRK | Class A Common Stock | Other | $0 | -345,340 | -100% | $0.000000 | 0 | 11 Dec 2025 | By Lightspeed SPV I-C, LLC | F5, F17 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +125,373 | $0.000000 | 125,373 | 11 Dec 2025 | By LS SPV Management, LLC | F18, F19 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | -125,373 | -100% | $0.000000 | 0 | 11 Dec 2025 | By LS SPV Management, LLC | F19, F20 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +5,307 | $0.000000 | 5,307 | 11 Dec 2025 | By Lightspeed Management Company, L.L.C. | F21, F22, F23 | |
| transaction | RBRK | Class A Common Stock | Other | $0 | +15,832 | +19% | $0.000000 | 97,674 | 11 Dec 2025 | Direct | F24 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +45,865 | +12% | $0.000000 | 442,739 | 11 Dec 2025 | By Mhatre Investments LP - Fund 2 | F21, F25 |
| transaction | RBRK | Class A Common Stock | Other | $0 | +8,410 | +11% | $0.000000 | 83,909 | 11 Dec 2025 | By Mhatre Investments LP - Fund 3 | F22, F26 |
| transaction | RBRK | Class A Common Stock | Sale | $7,975,729 | -97,658 | -96% | $81.67 | 4,001 | 12 Dec 2025 | By Lightspeed Venture Partners X, L.P. | F6, F27 |
| transaction | RBRK | Class A Common Stock | Sale | $342,086 | -4,001 | -100% | $85.50 | 0 | 12 Dec 2025 | By Lightspeed Venture Partners X, L.P. | F6, F28 |
| holding | RBRK | Class A Common Stock | 649 | 11 Dec 2025 | By Trust | F29 |
| 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 | -1,387,454 | -25% | $0.000000 | 4,162,362 | 11 Dec 2025 | Class A Common Stock | 1,387,454 | By Lightspeed Venture Partners IX, L.P. | F1, F30 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -322,103 | -25% | $0.000000 | 966,307 | 11 Dec 2025 | Class A Common Stock | 322,103 | By Lightspeed Venture Partners Select II, L.P. | F2, F30 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -626,864 | -25% | $0.000000 | 1,880,593 | 11 Dec 2025 | Class A Common Stock | 626,864 | By Lightspeed SPV I, LLC | F3, F30 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -493,378 | -25% | $0.000000 | 1,480,133 | 11 Dec 2025 | Class A Common Stock | 493,378 | By Lightspeed SPV I-B, LLC | F4, F30 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -345,340 | -25% | $0.000000 | 1,036,018 | 11 Dec 2025 | Class A Common Stock | 345,340 | By Lightspeed SPV I-C, LLC | F5, F30 | |
| transaction | RBRK | Class B Common Stock | Conversion of derivative security | $0 | -101,659 | -100% | $0.000000 | 0 | 11 Dec 2025 | Class A Common Stock | 101,659 | By Lightspeed Venture Partners X, L.P. | F6, F30 |
| 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. The Reporting Person is a director of LUGP IX and shares voting and dispositive power with respect to the shares held by Lightspeed IX. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| 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. The Reporting Person is a director of LUGP Select II and shares voting and dispositive power with respect to the shares held by Lightspeed Select II. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| 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. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F4 | Shares are held by Lightspeed SPV I-B, LLC ("Lightspeed SPV I-B"). LS SPV is the manager of Lightspeed SPV I-B. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I-B. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F5 | Shares are held by Lightspeed SPV I-C, LLC ("Lightspeed SPV I-C"). LS SPV is the manager of Lightspeed SPV I-C. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by Lightspeed SPV I-C. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F6 | 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. The Reporting Person is a director of LUGP X and shares voting and dispositive power with respect to the shares held by Lightspeed X. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F7 | Represents an in-kind distribution by Lightspeed IX without consideration to its partners (including LGP IX). |
| F8 | Represents receipt of shares in the distribution in kind described in footnote (7). |
| F9 | Shares are held by LGP IX. LUGP IX is the general partner of LGP IX. The Reporting Person is a director of LUGP IX and shares voting and dispositive power with respect to the shares held by LGP IX. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F10 | Represents an in-kind distribution by LGP IX without consideration to its partners. |
| F11 | Represents an in-kind distribution by Lightspeed Select II without consideration to its partners (including LGP Select II). |
| F12 | Represents receipt of shares in the distribution in kind described in footnote (11). |
| F13 | Shares are held by LGP Select II. LUGP Select II is the general partner of LGP Select II. The Reporting Person is a director of LUGP Select II and shares voting and dispositive power with respect to the shares held by LGP Select II. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F14 | Represents an in-kind distribution by LGP Select II without consideration to its partners. |
| F15 | Represents an in-kind distribution by Lightspeed SPV I without consideration to its members. |
| F16 | Represents an in-kind distribution by Lightspeed SPV I-B without consideration to its members. |
| F17 | Represents an in-kind distribution by Lightspeed SPV I-C without consideration to its members. |
| F18 | Represents receipt of shares in the distribution in kind described in footnote (15). |
| F19 | Shares are held by LS SPV. The Reporting Person is a managing member of LS SPV and shares voting and dispositive power with respect to the shares held by LS SPV. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F20 | Represents an in-kind distribution by LS SPV without consideration to its members. |
| F21 | Represents receipt of shares in the distribution in kind described in footnote (10). |
| F22 | Represents receipt of shares in the distribution in kind described in footnote (14). |
| F23 | Shares are held by Lightspeed Management Company, L.L.C. ("LMC"). The Reporting Person is a managing member of LMC and shares voting and dispositive power with respect to the shares held by LMC. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. |
| F24 | Represents receipt of shares in the distribution in kind described in footnote (20). |
| F25 | The Reporting Person serves as trustee of the general partner of Mhatre Investments LP - Fund 2. |
| F26 | The Reporting Person serves as trustee of the general partner of Mhatre Investments LP - Fund 3. |
| F27 | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.275 to $82.19 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| F28 | The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.04 to $85.99 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. |
| F29 | The Reporting Person is the trustee of the Mhatre 2011 Irrevocable Children's Trust. |
| F30 | 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. |