Marmurek Eric S (CIK 1720721) reported 20 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-19). Recent activity: Buy RBBN (48,328 shares), Sell RBBN (19,107 shares), Buy RBBN (25,651 shares), Sell RBBN (10,092 shares), Buy RBBN (23,146 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Buy | 48,328 | $0 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Sell | 19,107 | $51,780 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Buy | 25,651 | $0 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Sell | 10,092 | $27,349 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Buy | 23,146 | $0 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Sell | 9,107 | $23,951 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Buy | 31,646 | $0 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Sell | 12,452 | $32,749 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Buy | 26,043 | $0 |
| 2026-05-19 | Ribbon Communications Inc. (RBBN) | EVP, Chief Financial Officer | Sell | 10,247 | $26,950 |
| 2026-04-17 | Ribbon Communications Inc. (RBBN) | SVP, Deputy CFO and CAO | Buy | 37,500 | $0 |
| 2026-04-17 | Ribbon Communications Inc. (RBBN) | SVP, Deputy CFO and CAO | Sell | 14,756 | $36,595 |
| 2025-10-17 | Ribbon Communications Inc. (RBBN) | SVP, Deputy CFO and CAO | Buy | 75,000 | $0 |
| 2025-10-17 | Ribbon Communications Inc. (RBBN) | SVP, Deputy CFO and CAO | Sell | 29,512 | $112,441 |
| 2025-05-19 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Buy | 31,645 | $0 |
| 2025-05-19 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Sell | 12,452 | $45,076 |
| 2025-04-22 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Buy | 23,234 | $0 |
| 2025-04-22 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Sell | 9,142 | $32,271 |
| 2025-04-22 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Buy | 13,354 | $0 |
| 2025-04-22 | Ribbon Communications Inc. (RBBN) | SVP, CAO & Deputy CFO | Sell | 5,254 | $18,809 |
来源：SEC Form 4 申报文件 · 截至 2026-05-19