Eric S Marmurek
CIK 1720721 · View on SEC EDGAR ↗
Insider
First SEC filing: Nov. 6, 2017 · Latest: June 17, 2026
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Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 100 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 15, 2026 | RBBN | A | 60,000 | — | — | 60,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2026 | RBBN | A | 90,000 | — | — | 90,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2026 | RBBN | A | 150,000 | — | — | 150,000 Direct | — | Acquired | (price as of 2026-08-19) |
| May 16, 2025 | RBBN | M | 31,645 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| May 16, 2025 | RBBN | F | 12,452 | $3.62 | $45,076 | 381,575 Direct | -3.16% | Disposed | -44.3% (price as of 2026-08-19) |
| May 16, 2025 | RBBN | M | 31,645 | — | — | 394,027 Direct | +8.73% | Acquired | (price as of 2026-08-19) |
| May 15, 2025 | RBBN | A | 36,392 | — | — | 36,392 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2025 | RBBN | A | 31,250 | — | — | 31,250 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2025 | RBBN | A | 46,875 | — | — | 46,875 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2025 | RBBN | A | 63,291 | — | — | 63,291 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2025 | RBBN | A | 78,125 | — | — | 78,125 Direct | — | Acquired | (price as of 2026-08-19) |
| April 18, 2025 | RBBN | M | 13,354 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| April 18, 2025 | RBBN | F | 5,254 | $3.58 | $18,809 | 362,382 Direct | -1.43% | Disposed | -43.7% (price as of 2026-08-19) |
| April 18, 2025 | RBBN | M | 13,354 | — | — | 367,636 Direct | +3.77% | Acquired | (price as of 2026-08-19) |
| April 17, 2025 | RBBN | M | 23,234 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| April 17, 2025 | RBBN | F | 9,142 | $3.53 | $32,271 | 354,282 Direct | -2.52% | Disposed | -42.9% (price as of 2026-08-19) |
| April 17, 2025 | RBBN | M | 23,234 | — | — | 363,424 Direct | +6.83% | Acquired | (price as of 2026-08-19) |
| March 15, 2025 | RBBN | M | 32,154 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2025 | RBBN | M | 16,399 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2025 | RBBN | M | 32,154 | — | — | 353,122 Direct | +10.02% | Acquired | (price as of 2026-08-19) |
| March 15, 2025 | RBBN | F | 7,321 | $3.95 | $28,918 | 320,968 Direct | -2.23% | Disposed | -49.0% (price as of 2026-08-19) |
| March 15, 2025 | RBBN | M | 16,399 | — | — | 328,289 Direct | +5.26% | Acquired | (price as of 2026-08-19) |
| Oct. 18, 2024 | RBBN | M | 13,355 | — | — | 13,354 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| Oct. 18, 2024 | RBBN | F | 5,255 | $3.56 | $18,708 | 311,890 Direct | -1.66% | Disposed | -43.4% (price as of 2026-08-19) |
| Oct. 18, 2024 | RBBN | M | 13,355 | — | — | 317,145 Direct | +4.40% | Acquired | (price as of 2026-08-19) |
| Oct. 17, 2024 | RBBN | M | 23,234 | — | — | 23,234 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| Oct. 17, 2024 | RBBN | F | 9,142 | $3.38 | $30,900 | 303,790 Direct | -2.92% | Disposed | -40.4% (price as of 2026-08-19) |
| Oct. 17, 2024 | RBBN | M | 23,234 | — | — | 312,932 Direct | +8.02% | Acquired | (price as of 2026-08-19) |
| Oct. 15, 2024 | RBBN | A | 150,000 | — | — | 150,000 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2024 | RBBN | A | 29,114 | — | — | 29,114 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2024 | RBBN | A | 43,670 | — | — | 43,670 Direct | — | Acquired | (price as of 2026-08-19) |
| May 15, 2024 | RBBN | A | 31,645 | — | — | 31,645 Direct | — | Acquired | (price as of 2026-08-19) |
| April 18, 2024 | RBBN | M | 13,354 | — | — | 26,709 Direct | -33.33% | Disposed | (price as of 2026-08-19) |
| April 18, 2024 | RBBN | F | 4,895 | $2.57 | $12,580 | 289,698 Direct | -1.66% | Disposed | -21.6% (price as of 2026-08-19) |
| April 18, 2024 | RBBN | M | 13,354 | — | — | 294,593 Direct | +4.75% | Acquired | (price as of 2026-08-19) |
| April 17, 2024 | RBBN | M | 46,469 | — | — | 46,468 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| April 17, 2024 | RBBN | F | 17,069 | $2.61 | $44,550 | 281,239 Direct | -5.72% | Disposed | -22.8% (price as of 2026-08-19) |
| April 17, 2024 | RBBN | M | 46,469 | — | — | 298,308 Direct | +18.45% | Acquired | (price as of 2026-08-19) |
| March 15, 2024 | RBBN | F | 12,932 | $3.95 | $51,081 | 340,190 Direct | -3.66% | Disposed | -49.0% (price as of 2026-08-19) |
| March 15, 2024 | RBBN | M | 1,581 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2024 | RBBN | M | 4,116 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2024 | RBBN | F | 1,554 | $2.83 | $4,398 | 251,839 Direct | -0.61% | Disposed | -28.8% (price as of 2026-08-19) |
| March 15, 2024 | RBBN | M | 1,581 | — | — | 253,393 Direct | +0.63% | Acquired | (price as of 2026-08-19) |
| March 15, 2024 | RBBN | M | 4,116 | — | — | 251,812 Direct | +1.66% | Acquired | (price as of 2026-08-19) |
| Jan. 18, 2024 | RBBN | M | 15,000 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Jan. 18, 2024 | RBBN | F | 4,447 | $2.84 | $12,629 | 247,696 Direct | -1.76% | Disposed | -29.0% (price as of 2026-08-19) |
| Jan. 18, 2024 | RBBN | M | 15,000 | — | — | 252,143 Direct | +6.33% | Acquired | (price as of 2026-08-19) |
| Oct. 18, 2023 | RBBN | M | 13,355 | — | — | 40,063 Direct | -25.00% | Disposed | (price as of 2026-08-19) |
| Oct. 18, 2023 | RBBN | F | 3,251 | $2.15 | $6,990 | 237,143 Direct | -1.35% | Disposed | -6.3% (price as of 2026-08-19) |
| Oct. 18, 2023 | RBBN | M | 13,355 | — | — | 240,394 Direct | +5.88% | Acquired | (price as of 2026-08-19) |
| Sept. 15, 2023 | RBBN | M | 4,117 | — | — | 4,117 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| Sept. 15, 2023 | RBBN | F | 1,002 | $2.83 | $2,836 | 227,039 Direct | -0.44% | Disposed | -28.8% (price as of 2026-08-19) |
| Sept. 15, 2023 | RBBN | M | 4,117 | — | — | 228,041 Direct | +1.84% | Acquired | (price as of 2026-08-19) |
| June 16, 2023 | RBBN | M | 48,231 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| June 16, 2023 | RBBN | F | 11,744 | $2.96 | $34,762 | 223,005 Direct | -5.00% | Disposed | -31.9% (price as of 2026-08-19) |
| June 16, 2023 | RBBN | M | 48,231 | — | — | 234,749 Direct | +25.86% | Acquired | (price as of 2026-08-19) |
| April 18, 2023 | RBBN | M | 26,710 | — | — | 53,418 Direct | -33.33% | Disposed | (price as of 2026-08-19) |
| April 18, 2023 | RBBN | F | 6,503 | $2.74 | $17,818 | 186,518 Direct | -3.37% | Disposed | -26.5% (price as of 2026-08-19) |
| April 18, 2023 | RBBN | M | 26,710 | — | — | 193,021 Direct | +16.06% | Acquired | (price as of 2026-08-19) |
| April 17, 2023 | RBBN | A | 37,175 | — | — | 37,175 Direct | — | Acquired | (price as of 2026-08-19) |
| April 17, 2023 | RBBN | A | 55,762 | — | — | 55,762 Direct | — | Acquired | (price as of 2026-08-19) |
| April 17, 2023 | RBBN | A | 92,937 | — | — | 92,937 Direct | — | Acquired | (price as of 2026-08-19) |
| March 16, 2023 | RBBN | M | 15,432 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 16, 2023 | RBBN | F | 3,730 | $3.54 | $13,204 | 166,311 Direct | -2.19% | Disposed | -43.1% (price as of 2026-08-19) |
| March 16, 2023 | RBBN | M | 15,432 | — | — | 170,041 Direct | +9.98% | Acquired | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 18,307 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 11,442 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 4,116 | — | — | 8,233 Direct | -33.33% | Disposed | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | F | 4,819 | $3.71 | $17,878 | 154,609 Direct | -3.02% | Disposed | -45.7% (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 18,307 | — | — | 159,428 Direct | +12.97% | Acquired | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | F | 3,392 | $3.71 | $12,584 | 141,121 Direct | -2.35% | Disposed | -45.7% (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 11,442 | — | — | 144,513 Direct | +8.60% | Acquired | (price as of 2026-08-19) |
| March 15, 2023 | RBBN | F | 1,220 | $3.71 | $4,526 | 133,071 Direct | -0.91% | Disposed | -45.7% (price as of 2026-08-19) |
| March 15, 2023 | RBBN | M | 4,116 | — | — | 134,291 Direct | +3.16% | Acquired | (price as of 2026-08-19) |
| Jan. 17, 2023 | RBBN | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-19) |
| Sept. 16, 2022 | RBBN | M | 15,432 | — | — | 133,932 Direct | +13.02% | Acquired | (price as of 2026-08-19) |
| Sept. 16, 2022 | RBBN | M | 15,432 | — | — | 15,432 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| Sept. 16, 2022 | RBBN | F | 3,757 | $2.95 | $11,083 | 130,175 Direct | -2.81% | Disposed | -31.7% (price as of 2026-08-19) |
| Sept. 15, 2022 | RBBN | M | 4,117 | — | — | 119,502 Direct | +3.57% | Acquired | (price as of 2026-08-19) |
| Sept. 15, 2022 | RBBN | F | 1,002 | $3.10 | $3,106 | 118,500 Direct | -0.84% | Disposed | -35.0% (price as of 2026-08-19) |
| Sept. 15, 2022 | RBBN | M | 4,117 | — | — | 12,349 Direct | -25.00% | Disposed | (price as of 2026-08-19) |
| June 15, 2022 | RBBN | A | 48,231 | — | — | 48,231 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2022 | RBBN | A | 32,154 | — | — | 32,154 Direct | — | Acquired | (price as of 2026-08-19) |
| June 15, 2022 | RBBN | A | 48,231 | — | — | 48,231 Direct | — | Acquired | (price as of 2026-08-19) |
| April 18, 2022 | RBBN | A | 80,128 | — | — | 80,128 Direct | — | Acquired | (price as of 2026-08-19) |
| April 15, 2022 | RBBN | M | 6,056 | $3.11 | $18,834 | 0 Direct | -100.00% | Disposed | -35.2% (price as of 2026-08-19) |
| April 15, 2022 | RBBN | F | 1,474 | $3.11 | $4,584 | 116,304 Direct | -1.25% | Disposed | -35.2% (price as of 2026-08-19) |
| April 15, 2022 | RBBN | M | 6,056 | — | — | 117,778 Direct | +5.42% | Acquired | (price as of 2026-08-19) |
| March 16, 2022 | RBBN | M | 15,432 | — | — | 30,864 Direct | -33.33% | Disposed | (price as of 2026-08-19) |
| March 16, 2022 | RBBN | F | 3,663 | $2.99 | $10,952 | 111,772 Direct | -3.17% | Disposed | -32.6% (price as of 2026-08-19) |
| March 16, 2022 | RBBN | M | 15,432 | — | — | 115,385 Direct | +15.44% | Acquired | (price as of 2026-08-19) |
| March 15, 2022 | RBBN | M | 11,047 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| March 15, 2022 | RBBN | M | 8,234 | — | — | 16,466 Direct | -33.34% | Disposed | (price as of 2026-08-19) |
| March 15, 2022 | RBBN | F | 8,386 | $2.81 | $23,565 | 99,953 Direct | -7.74% | Disposed | -28.3% (price as of 2026-08-19) |
| March 15, 2022 | RBBN | M | 11,047 | — | — | 108,339 Direct | +11.35% | Acquired | (price as of 2026-08-19) |
| March 15, 2022 | RBBN | A | 11,301 | — | — | 97,292 Direct | +13.14% | Acquired | (price as of 2026-08-19) |
| March 15, 2022 | RBBN | M | 8,234 | — | — | 85,991 Direct | +10.59% | Acquired | (price as of 2026-08-19) |
| Oct. 15, 2021 | RBBN | M | 6,056 | — | — | 6,056 Direct | -50.00% | Disposed | (price as of 2026-08-19) |
| Oct. 15, 2021 | RBBN | F | 1,474 | $6.35 | $9,360 | 77,757 Direct | -1.86% | Disposed | -68.3% (price as of 2026-08-19) |
| Oct. 15, 2021 | RBBN | M | 6,056 | — | — | 79,231 Direct | +8.28% | Acquired | (price as of 2026-08-19) |
Showing latest 100 of 103 transactions
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 15, 2026 | RBBN | PSUs | Common Stock (60,000) | — | — | 60,000 | Acquired |
| June 15, 2026 | RBBN | Performance-Based RSUs (PSUs) | Common Stock (90,000) | — | — | 90,000 | Acquired |
| June 15, 2026 | RBBN | Restructed Stock Unites (RSUs) | Common Stock (150,000) | — | — | 150,000 | Acquired |
| May 16, 2025 | RBBN | RSUs | Common Stock (31,645) | — | — | 31,645 | Disposed |
| May 15, 2025 | RBBN | PSUs | Common Stock (36,392) | — | — | 36,392 | Acquired |
| May 15, 2025 | RBBN | PSUs | Common Stock (31,250) | — | — | 31,250 | Acquired |
| May 15, 2025 | RBBN | Performance-Based RSUs (PSUs) | Common Stock (46,875) | — | — | 46,875 | Acquired |
| May 15, 2025 | RBBN | RSUs | Common Stock (63,291) | — | — | 63,291 | Acquired |
| May 15, 2025 | RBBN | Restricted Stock Units (RSUs) | Common Stock (78,125) | — | — | 78,125 | Acquired |
| April 18, 2025 | RBBN | RSUs | Common Stock (13,354) | — | — | 13,354 | Disposed |
| April 17, 2025 | RBBN | Restricted Stock Units (RSUs) | Common Stock (23,234) | — | — | 23,234 | Disposed |
| March 15, 2025 | RBBN | PSUs | Common Stock (32,154) | — | — | 32,154 | Disposed |
| March 15, 2025 | RBBN | Performance-Based Restricted Stock Units (PSUs) | Common Stock (16,399) | — | — | 16,399 | Disposed |
| Oct. 18, 2024 | RBBN | RSUs | Common Stock (13,355) | — | — | 13,355 | Disposed |
| Oct. 17, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (23,234) | — | — | 23,234 | Disposed |
| Oct. 15, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (150,000) | — | — | 150,000 | Acquired |
| May 15, 2024 | RBBN | PSUs | Common Stock (29,114) | — | — | 29,114 | Acquired |
| May 15, 2024 | RBBN | Performance-Based RSUs (PSUs) | Common Stock (43,670) | — | — | 43,670 | Acquired |
| May 15, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (31,645) | — | — | 31,645 | Acquired |
| April 18, 2024 | RBBN | RSUs | Common Stock (13,354) | — | — | 13,354 | Disposed |
| April 17, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (46,469) | — | — | 46,469 | Disposed |
| March 15, 2024 | RBBN | Performance-Based Restricted Stock Units | Common Stock (1,581) | — | — | 1,581 | Disposed |
| March 15, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (4,116) | — | — | 4,116 | Disposed |
| Jan. 18, 2024 | RBBN | Restricted Stock Units (RSUs) | Common Stock (15,000) | — | — | 15,000 | Disposed |
| Oct. 18, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (13,335) | — | — | 13,355 | Disposed |
| Sept. 15, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (4,117) | — | — | 4,117 | Disposed |
| June 16, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (48,231) | — | — | 48,231 | Disposed |
| April 18, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (26,710) | — | — | 26,710 | Disposed |
| April 17, 2023 | RBBN | PSUs | Common Stock (37,175) | — | — | 37,175 | Acquired |
| April 17, 2023 | RBBN | Performance-Based RSUs (PSUs) | Common Stock (55,762) | — | — | 55,762 | Acquired |
| April 17, 2023 | RBBN | RSUs | Common Stock (92,937) | — | — | 92,937 | Acquired |
| March 16, 2023 | RBBN | RSUs | Common Stock (15,432) | — | — | 15,432 | Disposed |
| March 15, 2023 | RBBN | PSUs | Common Stock (18,307) | — | — | 18,307 | Disposed |
| March 15, 2023 | RBBN | Performance-Based Restricted Stock Units | Common Stock (11,442) | — | — | 11,442 | Disposed |
| March 15, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (4,116) | — | — | 4,116 | Disposed |
| Jan. 17, 2023 | RBBN | Restricted Stock Units (RSUs) | Common Stock (15,000) | — | — | 15,000 | Acquired |
| Sept. 16, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (15,432) | — | — | 15,432 | Disposed |
| Sept. 15, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (4,117) | — | — | 4,117 | Disposed |
| June 15, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (48,231) | — | — | 48,231 | Acquired |
| June 15, 2022 | RBBN | PSU | Common Stock (32,154) | — | — | 32,154 | Acquired |
| June 15, 2022 | RBBN | Performance-Based Restricted Stock Unit (PSU) | Common Stock (48,231) | — | — | 48,231 | Acquired |
| April 18, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (80,128) | — | — | 80,128 | Acquired |
| April 15, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (6,056) | — | — | 6,056 | Disposed |
| March 16, 2022 | RBBN | Restricted Stock Unit (RSU) | Common Stock (15,432) | — | — | 15,432 | Disposed |
| March 15, 2022 | RBBN | Performance-based Restricted Stock Unit (PSUs) | Common Stock (11,047) | — | — | 11,047 | Disposed |
| March 15, 2022 | RBBN | Restricted Stock Units (RSU) | Common Stock (8,234) | — | — | 8,234 | Disposed |
| Oct. 15, 2021 | RBBN | Restricted Stock Units (RSU) | Common Stock (6,056) | — | — | 6,056 | Disposed |
| Sept. 16, 2021 | RBBN | Restricted Stock Units (RSU) | Common Stock (15,432) | — | — | 15,432 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Nov. 6, 2017 | RBBN | Common Stock | 2,315 | Direct |