As of September 29, 2026, the three largest insider holders of RBRK are Xiv Gp Llc Greylock (TenPercentOwner, 2.49Mn shares), Kiran Kumar Choudary (Chief Financial Officer, 958.08K shares), Barry Eggers (TenPercentOwner, 879.61K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Xiv Gp Llc Greylock | TenPercentOwner | 0 | 2,486,916 | 2,486,916 | 30.6% | 01 Apr, 2025 |
| 2 | Kiran Kumar Choudary | Chief Financial Officer | 958,078 | 0 | 958,078 | 11.8% | 17 Sep, 2026 |
| 3 | Venture Partners Ix, L.P. Lightspeed | TenPercentOwner | 59,182 | 820,431 | 879,613 | 10.8% | 30 Jun, 2025 |
| 4 | Barry Eggers | TenPercentOwner | 59,182 | 820,431 | 879,613 | 10.8% | 30 Jun, 2025 |
| 5 | Brian K. Mccarthy | Pres.,Global Sales Field Ops | 772,794 | 0 | 772,794 | 9.5% | 03 Feb, 2026 |
| 6 | Ravi Mhatre | Director | 125,351 | 608,062 | 733,413 | 9.0% | 14 Jul, 2026 |
| 7 | Bipul Sinha | Chairman Of The Board And Ceo | 56,652 | 500,000 | 556,652 | 6.8% | 25 Sep, 2026 |
| 8 | Spv I, Llc Lightspeed | TenPercentOwner | 21,221 | 491,770 | 512,991 | 6.3% | 27 Mar, 2025 |
| 9 | Arvind Nithrakashyap | Chief Technology Officer | 282,857 | 0 | 282,857 | 3.5% | 17 Sep, 2026 |
| 10 | Mark D Mclaughlin | Director | 20,028 | 0 | 20,028 | 0.2% | 05 Jun, 2026 |
| 11 | John Wendell Thompson | Director | 8,362 | 7,500 | 15,862 | 0.2% | 03 Sep, 2026 |
| 12 | Rakefet Russak-Aminoach | Director | 10,304 | 0 | 10,304 | 0.1% | 28 Aug, 2026 |
| 13 | Richard Scott Herren | Director | 7,461 | 0 | 7,461 | 0.1% | 03 Jun, 2026 |
| 14 | Asheem Chandna | Director | 6,249 | 0 | 6,249 | 0.1% | 05 Jun, 2026 |
| 15 | Yvonne Wassenaar | Director | 3,709 | 0 | 3,709 | 0.0% | 03 Sep, 2026 |
| 16 | Enrique T Salem | Director | 76 | 0 | 76 | 0.0% | 16 Jan, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 24 Sep, 2026 | Bipul Sinha | Chairman Of The Board And Ceo | Acquired C | 500,000 | — | — | 500,000 | Indirect |
| 24 Sep, 2026 | Bipul Sinha | Chairman Of The Board And Ceo | Acquired C | 55,000 | — | — | 111,652 | Direct |
| 25 Sep, 2026 | Bipul Sinha | Chairman Of The Board And Ceo | Disposed G | 55,000 | $0.00 | $0 | 56,652 | Direct |
| 24 Sep, 2026 | Bipul Sinha | Chairman Of The Board And Ceo | Disposed C | 555,000 | $0.00 | $0 | 10,679,839 | Direct |
| 25 Sep, 2026 | Bipul Sinha | Chairman Of The Board And Ceo | Acquired J | 500,000 | — | — | 500,000 | Indirect |
| 15 Sep, 2026 | Arvind Nithrakashyap | Chief Technology Officer | Disposed F | 10,436 | $100.20 | $1.05Mn | 282,857 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Acquired C | 4,000 | $0.00 | $0 | 982,073 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 1,100 | $99.08 | $108.99K | 980,973 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 586 | $100.20 | $58.72K | 980,387 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 1,214 | $101.47 | $123.18K | 979,173 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 700 | $102.72 | $71.90K | 978,473 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 400 | $103.48 | $41.39K | 978,073 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed F | 13,995 | $100.20 | $1.40Mn | 964,078 | Direct |
| 17 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 200 | $102.05 | $20.41K | 963,878 | Direct |
| 17 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 200 | $103.86 | $20.77K | 963,678 | Direct |
| 17 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 300 | $105.98 | $31.79K | 963,378 | Direct |
| 17 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 2,728 | $107.42 | $293.04K | 960,650 | Direct |
| 17 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed S | 2,572 | $108.05 | $277.90K | 958,078 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Disposed M | 4,000 | $0.00 | $0 | 11,450 | Direct |
| 15 Sep, 2026 | Kiran Kumar Choudary | Chief Financial Officer | Acquired M | 4,000 | $0.00 | $0 | 4,000 | Direct |