Ribbon Communications (RBBN)
Ribbon Communications on one page: short interest, daily short volume, fails to deliver, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-computer integrated systems design.
5.0M
Short interest
settlement 2026-09-30
4.0
Days to cover
-3.1 days vs prior
44.3%
Short share of volume
2026-10-09
1,536
Fails to deliver
settlement 2026-08-26
Wed 21 Oct
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in RBBN is 5,012,672 shares, up 288,156 shares over the last month. Over the last 48 readings it ranged from 1,284,702 shares (31 October 2024) to 5,133,163 shares (15 September 2026). The latest reading sits at the top of that range. At the reported average volume of 1.2M shares a day that is 4.0 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/rbbn" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 5,012,672 | -2.4% | 1,246,023 | 4.02 |
| 2026-09-15 | 5,133,163 | +8.7% | 726,220 | 7.07 |
| 2026-08-31 | 4,724,516 | +6.8% | 667,363 | 7.08 |
| 2026-08-14 | 4,423,423 | +9.7% | 597,829 | 7.40 |
| 2026-07-31 | 4,034,032 | -3.1% | 832,505 | 4.85 |
| 2026-07-15 | 4,161,563 | +14.0% | 824,219 | 5.05 |
| 2026-06-30 | 3,649,863 | -4.7% | 860,379 | 4.24 |
| 2026-06-15 | 3,828,201 | -1.8% | 797,894 | 4.80 |
| 2026-05-29 | 3,896,613 | +9.9% | 1,522,933 | 2.56 |
| 2026-05-15 | 3,544,743 | +3.5% | 681,225 | 5.20 |
| 2026-04-30 | 3,424,570 | +7.3% | 1,148,450 | 2.98 |
| 2026-04-15 | 3,192,230 | +1.3% | 1,041,697 | 3.06 |
| 2026-03-31 | 3,151,966 | +4.9% | 533,975 | 5.90 |
| 2026-03-13 | 3,004,557 | -10.8% | 764,315 | 3.93 |
| 2026-02-27 | 3,369,224 | -9.1% | 1,066,013 | 3.16 |
| 2026-02-13 | 3,707,139 | +6.1% | 1,551,483 | 2.39 |
| 2026-01-30 | 3,494,153 | +3.4% | 435,291 | 8.03 |
| 2026-01-15 | 3,377,824 | +0.8% | 601,187 | 5.62 |
| 2025-12-31 | 3,352,510 | +4.2% | 578,907 | 5.79 |
| 2025-12-15 | 3,218,179 | +2.6% | 704,374 | 4.57 |
| 2025-11-28 | 3,136,135 | -3.7% | 747,420 | 4.20 |
| 2025-11-14 | 3,255,200 | +3.8% | 670,619 | 4.85 |
| 2025-10-31 | 3,135,484 | +2.5% | 988,421 | 3.17 |
| 2025-10-15 | 3,059,236 | -6.8% | 595,217 | 5.14 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of RBBN volume is 44.3%, up 17.7 points over the last five sessions. Over the last 30 readings it ranged from 26.6% (2 October 2026) to 85.8% (10 September 2026). The latest reading is 11.0 points below the 30-session average of 55.3%, on 192K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 85K | 192K | 44.3% | 100 |
| 2026-10-08 | 187K | 333K | 56.2% | 109 |
| 2026-10-07 | 158K | 439K | 35.9% | 388 |
| 2026-10-06 | 136K | 369K | 36.8% | 250 |
| 2026-10-05 | 653K | 871K | 75.0% | 803 |
| 2026-10-02 | 238K | 894K | 26.6% | 0 |
| 2026-10-01 | 356K | 834K | 42.7% | 1,691 |
| 2026-09-30 | 200K | 424K | 47.2% | 0 |
| 2026-09-29 | 138K | 235K | 58.8% | 0 |
| 2026-09-28 | 278K | 468K | 59.5% | 168 |
| 2026-09-25 | 158K | 364K | 43.4% | 53,997 |
| 2026-09-24 | 203K | 311K | 65.3% | 1,000 |
| 2026-09-23 | 559K | 869K | 64.3% | 290 |
| 2026-09-22 | 45K | 127K | 35.4% | 46 |
| 2026-09-21 | 188K | 348K | 54.0% | 54 |
| 2026-09-18 | 312K | 427K | 73.0% | 1 |
| 2026-09-17 | 195K | 424K | 46.1% | 27,948 |
| 2026-09-16 | 641K | 1.7M | 37.5% | 142,064 |
| 2026-09-15 | 604K | 890K | 67.8% | 125,258 |
| 2026-09-14 | 76K | 158K | 48.2% | 0 |
| 2026-09-11 | 54K | 187K | 28.7% | 400 |
| 2026-09-10 | 288K | 336K | 85.8% | 685 |
| 2026-09-09 | 234K | 338K | 69.3% | 140 |
| 2026-09-08 | 110K | 207K | 52.9% | 0 |
| 2026-09-04 | 329K | 405K | 81.3% | 700 |
| 2026-09-03 | 247K | 375K | 65.9% | 2,866 |
| 2026-09-02 | 186K | 290K | 64.3% | 1,298 |
| 2026-09-01 | 248K | 314K | 78.8% | 37 |
| 2026-08-31 | 119K | 210K | 56.8% | 218 |
| 2026-08-28 | 125K | 221K | 56.7% | 22 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 26 August 2026, the fails-to-deliver balance in RBBN is 1,536 shares, up 1,520 shares over the last settlement date. Over the last 30 readings it ranged from 5 shares (12 June 2026) to 49,952 shares (8 May 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-26 | 1,536 | $2.06 | $3K |
| 2026-08-19 | 16 | $2.04 | $33 |
| 2026-08-06 | 2,769 | $2.15 | $6K |
| 2026-08-05 | 23 | $2.17 | $50 |
| 2026-07-23 | 1,531 | $2.16 | $3K |
| 2026-07-21 | 2,158 | $2.11 | $5K |
| 2026-07-20 | 6 | $2.20 | $13 |
| 2026-07-02 | 84 | $2.35 | $197 |
| 2026-06-30 | 7,431 | $2.22 | $16K |
| 2026-06-26 | 17 | $2.25 | $38 |
| 2026-06-12 | 5 | $2.70 | $14 |
| 2026-06-09 | 61 | $2.88 | $176 |
| 2026-05-11 | 9,200 | $2.78 | $26K |
| 2026-05-08 | 49,952 | $2.69 | $134K |
| 2026-04-28 | 3,698 | $2.66 | $10K |
| 2026-04-27 | 345 | $2.78 | $959 |
| 2026-04-14 | 3,666 | $2.38 | $9K |
| 2026-04-13 | 3,563 | $2.47 | $9K |
| 2026-04-10 | 777 | $2.25 | $2K |
| 2026-04-06 | 46,579 | $2.18 | $102K |
| 2026-03-31 | 1,609 | $2.08 | $3K |
| 2026-03-25 | 8,329 | $2.19 | $18K |
| 2026-03-23 | 30 | $2.11 | $63 |
| 2026-03-04 | 16,627 | $2.33 | $39K |
| 2026-03-03 | 4,900 | $2.43 | $12K |
| 2026-02-24 | 13 | $2.06 | $27 |
| 2026-02-20 | 50 | $2.03 | $102 |
| 2026-02-19 | 208 | $2.02 | $420 |
| 2026-02-17 | 4,000 | $2.09 | $8K |
| 2026-02-12 | 13 | $1.97 | $26 |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONNo open-market insider trades were reported for RBBN in the last 90 days. The most recent filings are listed below. Latest filing: SHANI SHAUL (Director) on 2026-07-15.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-07-15 | SHANI SHAUL | Director | Grant | 12K | price not stated in the filing | not stated | 238K |
| 2026-07-15 | GRAYSON BRUNS H | Director | Grant | 14K | price not stated in the filing | not stated | 840K |
| 2026-06-16 | EWING R STEWART JR | Director | Option exercise | 43K | price not stated in the filing | not stated | 240K |
| 2026-06-16 | GRAYSON BRUNS H | Director | Option exercise | 43K | price not stated in the filing | not stated | 826K |
| 2026-06-16 | INFANTE BEATRIZ V | Director | Option exercise | 43K | price not stated in the filing | not stated | 386K |
| 2026-06-16 | SHANI SHAUL | Director | Option exercise | 43K | price not stated in the filing | not stated | 226K |
| 2026-06-16 | Mair Scott | Director | Option exercise | 68K | price not stated in the filing | not stated | 208K |
| 2026-06-16 | Tamone Tanya | Director | Option exercise | 43K | price not stated in the filing | not stated | 223K |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Option exercise | 174K | price not stated in the filing | not stated | 1.8M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 68K | $2.63 | $180K | 1.7M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Option exercise | 237K | price not stated in the filing | not stated | 2.0M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 93K | $2.63 | $246K | 1.9M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Option exercise | 125K | price not stated in the filing | not stated | 2.0M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 49K | $2.63 | $129K | 2.0M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Option exercise | 1.6M | price not stated in the filing | not stated | 3.5M |
| 2026-05-15 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 615K | $2.63 | $1.6M | 2.9M |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Tax withholding | 12K | $2.63 | $33K | 528K |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Option exercise | 23K | price not stated in the filing | not stated | 518K |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Option exercise | 26K | price not stated in the filing | not stated | 554K |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Tax withholding | 9K | $2.63 | $24K | 508K |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Option exercise | 32K | price not stated in the filing | not stated | 540K |
| 2026-05-15 | Marmurek Eric S | EVP, Chief Financial Officer | Tax withholding | 10K | $2.63 | $27K | 544K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 45K | $2.63 | $117K | 599K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 83K | price not stated in the filing | not stated | 644K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 53K | price not stated in the filing | not stated | 589K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 39K | price not stated in the filing | not stated | 557K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 21K | $2.63 | $54K | 536K |
| 2026-05-15 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 28K | $2.63 | $74K | 561K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Option exercise | 33K | price not stated in the filing | not stated | 442K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Tax withholding | 15K | $2.63 | $39K | 427K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Option exercise | 45K | price not stated in the filing | not stated | 472K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Tax withholding | 20K | $2.63 | $53K | 452K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Tax withholding | 24K | $2.63 | $64K | 482K |
| 2026-05-15 | Macken Patrick W | EVP, Chief Legal Officer | Option exercise | 54K | price not stated in the filing | not stated | 506K |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Option exercise | 57K | price not stated in the filing | not stated | 1.6M |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Option exercise | 34K | price not stated in the filing | not stated | 1.6M |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 14K | $2.71 | $37K | 1.5M |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 22K | $2.71 | $61K | 1.6M |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Option exercise | 107K | price not stated in the filing | not stated | 1.7M |
| 2026-04-17 | McClelland Bruce William | Chief Executive Officer | Tax withholding | 42K | $2.71 | $115K | 1.6M |
| 2026-04-17 | Marmurek Eric S | EVP, Chief Financial Officer | Tax withholding | 19K | $2.71 | $52K | 479K |
| 2026-04-17 | Marmurek Eric S | EVP, Chief Financial Officer | Option exercise | 26K | price not stated in the filing | not stated | 505K |
| 2026-04-17 | Marmurek Eric S | EVP, Chief Financial Officer | Tax withholding | 10K | $2.71 | $27K | 495K |
| 2026-04-17 | Marmurek Eric S | EVP, Chief Financial Officer | Option exercise | 48K | price not stated in the filing | not stated | 498K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 14K | $2.71 | $37K | 461K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 43K | $2.71 | $117K | 518K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 81K | price not stated in the filing | not stated | 561K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Tax withholding | 23K | $2.71 | $62K | 481K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 43K | price not stated in the filing | not stated | 504K |
| 2026-04-17 | Bucci Sam | EVP, Chief Operating Officer | Option exercise | 26K | price not stated in the filing | not stated | 475K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
13F holders
Tracked managers holding RBBN at their latest 13F. JSON5 of the 30 tracked managers held RBBN at their latest 13F, $12.3M in total at quarter-end prices. D. E. Shaw & Co. is the largest at $4.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 0 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2026-06-30 | 1.8M | $4.2M | 0.00% | +252K |
| AQR Capital Management | 2026-06-30 | 1.4M | $3.3M | 0.00% | +152K |
| Citadel Advisors | 2026-06-30 | 1.2M | $2.9M | 0.00% | +666K |
| Millennium Management | 2026-06-30 | 698K | $1.6M | 0.00% | +207K |
| Two Sigma Investments | 2026-06-30 | 102K | $239K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Ribbon Communications reported revenue of $192.3M, down 12.8% from the same quarter a year earlier, and net loss of $26.9M (-0.15 diluted EPS). In FY 2025 it generated $51.4M of operating cash flow and spent $9.0M on buybacks. As of 2026-06-30, cash was $43.5M against $337.8M of debt.
- Cash
- $43.5M
- Debt
- $337.8M
- Equity
- $392.6M
- Total assets
- $1.14B
- Shares outstanding
- 178,823,352
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $192.3M | -$26.9M | -14.0% | -0.15 |
| Q1 FY 2026 | 2026-03-31 | $162.6M | -$34.5M | -21.2% | -0.20 |
| Q4 FY 2025derived | 2025-12-31 | $227.3M | $89.1M | 39.2% | n/a |
| Q3 FY 2025 | 2025-09-30 | $215.4M | -$12.1M | -5.6% | -0.07 |
| Q2 FY 2025 | 2025-06-30 | $220.6M | -$11.1M | -5.0% | -0.06 |
| Q1 FY 2025 | 2025-03-31 | $181.3M | -$26.2M | -14.5% | -0.15 |
| Q4 FY 2024derived | 2024-12-31 | $251.4M | $6.4M | 2.5% | n/a |
| Q3 FY 2024 | 2024-09-30 | $210.2M | -$13.4M | -6.4% | -0.08 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $844.6M | $39.6M | $51.4M | $25.3M | $9.0M | n/a |
| FY 2024 | 2024-12-31 | $833.9M | -$54.2M | $50.2M | $22.4M | n/a | n/a |
| FY 2023 | 2023-12-31 | $826.3M | -$66.2M | $17.1M | $9.4M | n/a | n/a |
| FY 2022 | 2022-12-31 | $819.8M | -$98.1M | -$26.4M | $10.3M | n/a | n/a |
| FY 2021 | 2021-12-31 | $845.0M | -$177.2M | $19.2M | $17.1M | $0 | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-28 from the cover page.
What this page is
Ribbon Communications in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Ribbon Communications (RBBN), SEC CIK 1708055, listed on Nasdaq, classified by the SEC as services-computer integrated systems design. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-26.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-28.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-07-15.JSON and CSV
- Company record
- EDGAR filing index for CIK 1708055Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of RBBN is sold short?
What is RBBN's daily short volume?
Does RBBN have fails to deliver?
Are RBBN insiders buying or selling?
What did RBBN report last quarter?
Which tracked 13F managers own RBBN?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.