As of May 04, 2026, the three largest insider holders of RBBN are Chase Co Jpmorgan (TenPercentOwner, 52.04Mn shares), Investments Ltd. Swarth (TenPercentOwner, 27.44Mn shares), Investments Ltd. Swarth (TenPercentOwner, 27.44Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Chase Co Jpmorgan | - | 0 | 52,036,572 | 11 Apr, 2025 |
| Investments Ltd. Swarth | - | 27,435,739 | 0 | 18 Aug, 2022 |
| Investments Ltd. Swarth | - | 27,435,739 | 0 | 18 Aug, 2022 |
| Bruce William Mcclelland | President Ceo | 1,516,164 | 0 | 13 Feb, 2026 |
| Bruns H Grayson | - | 783,347 | 0 | 17 Apr, 2026 |
| Miguel A Lopez | Evp, Cfo | 456,797 | 0 | 21 Oct, 2024 |
| Eric S Marmurek | Svp, Deputy Cfo And Cao | 449,807 | 0 | 17 Apr, 2026 |
| Sam Bucci | Evp Coo | 448,811 | 0 | 17 Oct, 2025 |
| Patrick W Macken | Evp, Clo Secretary | 343,546 | 0 | 17 Oct, 2025 |
| Beatriz V Infante | - | 343,224 | 0 | 08 Sep, 2025 |
| Steven M Bruny | Evp Sales, Americas Region | 297,359 | 0 | 19 Sep, 2022 |
| Anthony Scarfo | Evp Gm, Cloud Edge Bu | 252,431 | 0 | 19 Sep, 2022 |
| Anthony Scarfo | Evp Gm, Cloud Edge Bu | 252,431 | 0 | 19 Sep, 2022 |
| R Stewart Jr Ewing | - | 197,391 | 0 | 18 Jun, 2025 |
| Shaul Shani | - | 183,466 | 0 | 17 Apr, 2026 |
| Tanya Tamone | - | 180,800 | 0 | 18 Jun, 2025 |
| Tanya Tamone | - | 180,800 | 0 | 18 Jun, 2025 |
| Shaul Shani | - | 170,495 | 0 | 20 Jan, 2026 |
| Scott Mair | - | 140,638 | 0 | 18 Jun, 2025 |
| John Raymond Townsend | Evp, Chief Financial Officer | 93,309 | 0 | 17 Apr, 2026 |
| Krish A Prabhu | - | 58,477 | 0 | 27 May, 2022 |
| Beer Mariano De | - | 56,331 | 0 | 16 Jun, 2023 |
| Beer Mariano De | - | 56,331 | 0 | 16 Jun, 2023 |
| Stephen J. Mccaffery | Evp, Sales Emea And Apac | 50,025 | 0 | 19 Sep, 2022 |
| Investments Ltd. Swarth | - | 5,000 | 0 | 03 Apr, 2023 |
| Investments Ltd. Swarth | - | 5,000 | 0 | 03 Apr, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 15 Apr, 2026 | John Raymond Townsend | Common Stock | A | 25,641 | - | 103,398 | D | M |
| 15 Apr, 2026 | Bruns H Grayson | Common Stock | A | 15,919 | - | 783,347 | D | A |
| 15 Apr, 2026 | Eric S Marmurek | Common Stock | A | 37,500 | - | 464,563 | D | M |
| 15 Apr, 2026 | Shaul Shani | Common Stock | A | 12,971 | - | 183,466 | D | A |
| 15 Apr, 2026 | Eric S Marmurek | Common Stock | D | 14,756 | $2.48 | 449,807 | D | F |
| 15 Apr, 2026 | John Raymond Townsend | Common Stock | D | 10,089 | $2.48 | 93,309 | D | F |
| 15 Apr, 2026 | John Raymond Townsend | Restricted Stock Units (RSUs) | D | 25,641 | $0.00 | 76,923 | D | M |
| 15 Apr, 2026 | Eric S Marmurek | Restricted Stock Units (RSUs) | D | 37,500 | $0.00 | 37,500 | D | M |
| 10 Feb, 2026 | Bruce William Mcclelland | Common Stock | A | 12,000 | $2.06 | 1,491,164 | D | P |
| 11 Feb, 2026 | Bruce William Mcclelland | Common Stock | A | 12,500 | $1.99 | 1,503,664 | D | P |
| 13 Feb, 2026 | Bruce William Mcclelland | Common Stock | A | 12,500 | $1.98 | 1,516,164 | D | P |
| 15 Jan, 2026 | Bruns H Grayson | Common Stock | A | 11,718 | - | 767,428 | D | A |
| 15 Jan, 2026 | Shaul Shani | Common Stock | A | 9,548 | - | 170,495 | D | A |
| 15 Jan, 2026 | Shaul Shani | Common Stock | A | 9,548 | - | 170,495 | D | A |
| 15 Dec, 2025 | Eric S Marmurek | Restricted Stock Units (RSUs) | D | 169,721 | $0.00 | 169,721 | D | A |
| 31 Oct, 2025 | Stephen J. Mccaffery | Restricted Stock Units (RSUs) | A | 432,027 | $0.00 | 432,027 | D | A |
| 31 Oct, 2025 | Stephen J. Mccaffery | RSUs | A | 108,006 | $0.00 | 108,006 | D | A |
| 31 Oct, 2025 | Stephen J. Mccaffery | Performance-Based RSUs (PSUs) | A | 64,804 | $0.00 | 64,804 | D | A |
| 31 Oct, 2025 | Stephen J. Mccaffery | PSUs | A | 43,202 | $0.00 | 43,202 | D | A |
| 15 Oct, 2025 | Shaul Shani | Common Stock | A | 7,236 | - | 160,947 | D | A |