Rambus (RMBS)
Rambus on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as semiconductors & related devices.
4.8M
Short interest
settlement 2026-09-30
1.4
Days to cover
-1.8 days vs prior
43.4%
Short share of volume
2026-10-09
6,717
Fails to deliver
settlement 2026-09-11
Mon 26 Oct
Next earnings
estimated date
-$1.6M
Insider flow, 90 days
0 buys, 3 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 RMBS is 4,784,389 shares, down 1,276,520 shares over the last month. Over the last 48 readings it ranged from 2,660,958 shares (15 October 2024) to 7,682,296 shares (15 June 2026). At the reported average volume of 3.3M shares a day that is 1.4 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/rmbs" 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 | 4,784,389 | -23.1% | 3,297,398 | 1.45 |
| 2026-09-15 | 6,222,309 | +2.7% | 1,933,703 | 3.22 |
| 2026-08-31 | 6,060,909 | +11.6% | 1,932,043 | 3.14 |
| 2026-08-14 | 5,432,091 | +32.9% | 1,917,835 | 2.83 |
| 2026-07-31 | 4,087,131 | -10.8% | 3,171,524 | 1.29 |
| 2026-07-15 | 4,581,716 | -6.1% | 2,838,332 | 1.61 |
| 2026-06-30 | 4,878,765 | -36.5% | 4,603,682 | 1.06 |
| 2026-06-15 | 7,682,296 | +6.2% | 2,780,947 | 2.76 |
| 2026-05-29 | 7,232,931 | -5.2% | 2,030,653 | 3.56 |
| 2026-05-15 | 7,632,626 | +11.0% | 2,276,353 | 3.35 |
| 2026-04-30 | 6,878,263 | +1.7% | 3,309,260 | 2.08 |
| 2026-04-15 | 6,763,258 | +12.9% | 1,976,043 | 3.42 |
| 2026-03-31 | 5,990,703 | -13.4% | 1,899,690 | 3.15 |
| 2026-03-13 | 6,914,782 | +9.4% | 2,070,534 | 3.34 |
| 2026-02-27 | 6,321,929 | -1.9% | 1,450,905 | 4.36 |
| 2026-02-13 | 6,447,760 | +35.1% | 4,312,895 | 1.49 |
| 2026-01-30 | 4,773,182 | +10.7% | 2,934,905 | 1.63 |
| 2026-01-15 | 4,310,850 | +5.6% | 1,740,510 | 2.48 |
| 2025-12-31 | 4,082,282 | +1.0% | 1,186,894 | 3.44 |
| 2025-12-15 | 4,043,238 | +11.5% | 1,263,993 | 3.20 |
| 2025-11-28 | 3,627,613 | -1.7% | 1,727,844 | 2.10 |
| 2025-11-14 | 3,691,013 | -14.4% | 1,771,608 | 2.08 |
| 2025-10-31 | 4,311,264 | -2.5% | 2,418,708 | 1.78 |
| 2025-10-15 | 4,420,382 | -3.4% | 1,997,677 | 2.21 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of RMBS volume is 43.4%, down 14.7 points over the last five sessions. Over the last 30 readings it ranged from 23.4% (31 August 2026) to 68.9% (18 September 2026). The latest reading is 9.8 points below the 30-session average of 53.1%, on 446K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 193K | 446K | 43.4% | 185 |
| 2026-10-08 | 260K | 722K | 36.0% | 655 |
| 2026-10-07 | 172K | 373K | 46.0% | 467 |
| 2026-10-06 | 317K | 551K | 57.6% | 773 |
| 2026-10-05 | 203K | 369K | 55.0% | 253 |
| 2026-10-02 | 306K | 528K | 58.0% | 231 |
| 2026-10-01 | 217K | 459K | 47.3% | 367 |
| 2026-09-30 | 793K | 1.2M | 68.3% | 1,000 |
| 2026-09-29 | 214K | 505K | 42.4% | 0 |
| 2026-09-28 | 467K | 877K | 53.3% | 651 |
| 2026-09-25 | 285K | 588K | 48.4% | 591 |
| 2026-09-24 | 374K | 657K | 56.9% | 900 |
| 2026-09-23 | 741K | 1.1M | 68.4% | 11 |
| 2026-09-22 | 999K | 1.9M | 52.5% | 50 |
| 2026-09-21 | 726K | 1.3M | 54.9% | 918 |
| 2026-09-18 | 584K | 848K | 68.9% | 18 |
| 2026-09-17 | 384K | 649K | 59.1% | 2,192 |
| 2026-09-16 | 283K | 604K | 46.9% | 8,660 |
| 2026-09-15 | 373K | 683K | 54.7% | 0 |
| 2026-09-14 | 464K | 942K | 49.3% | 0 |
| 2026-09-11 | 194K | 367K | 52.8% | 358 |
| 2026-09-10 | 324K | 509K | 63.6% | 0 |
| 2026-09-09 | 311K | 492K | 63.1% | 169 |
| 2026-09-08 | 501K | 786K | 63.8% | 16 |
| 2026-09-04 | 416K | 668K | 62.3% | 7 |
| 2026-09-03 | 351K | 649K | 54.0% | 984 |
| 2026-09-02 | 340K | 908K | 37.4% | 282 |
| 2026-09-01 | 296K | 622K | 47.5% | 109 |
| 2026-08-31 | 190K | 813K | 23.4% | 0 |
| 2026-08-28 | 523K | 901K | 58.0% | 4 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 11 September 2026, the fails-to-deliver balance in RMBS is 6,717 shares, up 5,664 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (28 May 2026) to 154,608 shares (30 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-11 | 6,717 | $85.35 | $573K |
| 2026-09-10 | 1,053 | $87.65 | $92K |
| 2026-08-28 | 1,842 | $91.11 | $168K |
| 2026-08-26 | 47 | $89.86 | $4K |
| 2026-08-25 | 35 | $87.07 | $3K |
| 2026-08-05 | 9,426 | $100.55 | $948K |
| 2026-07-28 | 5 | $96.42 | $482 |
| 2026-07-20 | 93 | $101.44 | $9K |
| 2026-06-30 | 154,608 | $123.90 | $19.2M |
| 2026-06-29 | 149,447 | $114.73 | $17.1M |
| 2026-06-23 | 904 | $140.35 | $127K |
| 2026-06-22 | 24 | $141.17 | $3K |
| 2026-06-18 | 27 | $130.10 | $4K |
| 2026-06-16 | 4,098 | $143.29 | $587K |
| 2026-06-12 | 30,810 | $144.47 | $4.5M |
| 2026-06-11 | 584 | $138.12 | $81K |
| 2026-06-10 | 6,726 | $146.84 | $988K |
| 2026-06-09 | 63,711 | $152.03 | $9.7M |
| 2026-06-04 | 13,010 | $170.66 | $2.2M |
| 2026-06-03 | 69 | $166.78 | $12K |
| 2026-06-02 | 208 | $147.48 | $31K |
| 2026-05-28 | 3 | $148.66 | $446 |
| 2026-05-27 | 9,650 | $157.23 | $1.5M |
| 2026-05-26 | 8,613 | $142.98 | $1.2M |
| 2026-05-19 | 761 | $123.76 | $94K |
| 2026-05-18 | 100 | $127.05 | $13K |
| 2026-05-15 | 462 | $130.46 | $60K |
| 2026-05-14 | 18,858 | $134.85 | $2.5M |
| 2026-05-13 | 207 | $130.28 | $27K |
| 2026-05-12 | 61,298 | $134.51 | $8.2M |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONInsiders at RMBS reported 3 open-market sells worth $1.6M in the last 90 days and no open-market buys. Latest filing: KISSNER CHARLES (Director) on 2026-10-02.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-02 | KISSNER CHARLES | Director | Sell | 5K | $111.00 | $555K | 4K |
| 2026-09-22 | KISSNER CHARLES | Director | Sell | 5K | $105.00 | $525K | 9K |
| 2026-08-07 | KISSNER CHARLES | Director | Sell | 5K | $100.92 | $505K | 14K |
| 2026-06-03 | Sayiner Necip | Director | Sell | 5K | $170.15 | $851K | 18K |
| 2026-06-02 | Higashi Emiko | Director | Sell | 5K | $158.00 | $790K | 50K |
| 2026-06-02 | Higashi Emiko | Director | Sell | 5K | $163.00 | $815K | 55K |
| 2026-06-01 | STANG ERIC B | Director | Sell | 5K | $146.00 | $730K | 19K |
| 2026-05-26 | FAN XIANZHI SEAN | EVP, COO | Sell | 100 | $152.35 | $15K | 168K |
| 2026-05-26 | FAN XIANZHI SEAN | EVP, COO | Sell | 38K | $151.69 | $5.7M | 168K |
| 2026-05-26 | Higashi Emiko | Director | Sell | 5K | $157.57 | $788K | 60K |
| 2026-05-22 | Shinn John | SVP, General Counsel | Sell | 1K | $143.63 | $144K | 21K |
| 2026-05-08 | Sayiner Necip | Director | Sell | 10K | $130.18 | $1.3M | 23K |
| 2026-05-07 | LAUB STEVEN | Director | Sell | 2K | $125.52 | $188K | 8K |
| 2026-05-01 | Gagneja Sumeet | SVP, CFO | Grant | 27K | $0.00 | $0 | 41K |
| 2026-05-01 | Gagneja Sumeet | SVP, CFO | Grant | 15K | $0.00 | $0 | 15K |
| 2026-04-24 | Rao Meera | Director | Sell | 3K | $150.30 | $447K | 20K |
| 2026-04-14 | Rao Meera | Director | Sell | 9K | $118.08 | $1.0M | 23K |
| 2026-04-03 | Allen John K | Chief Accounting Officer | Tax withholding | 1K | $92.22 | $104K | 17K |
| 2026-04-02 | Seraphin Luc | President and CEO | Sell | 165 | $88.35 | $15K | 346K |
| 2026-04-02 | Seraphin Luc | President and CEO | Sell | 3K | $87.11 | $240K | 346K |
| 2026-04-02 | Seraphin Luc | President and CEO | Sell | 3K | $86.04 | $216K | 349K |
| 2026-04-01 | Rao Meera | Director | Grant | 2K | $0.00 | $0 | 31K |
| 2026-04-01 | Sayiner Necip | Director | Grant | 2K | $0.00 | $0 | 33K |
| 2026-04-01 | STANG ERIC B | Director | Grant | 2K | $0.00 | $0 | 2K |
| 2026-04-01 | Shinn John | SVP, General Counsel | Tax withholding | 2K | $89.95 | $172K | 22K |
| 2026-04-01 | Shinn John | SVP, General Counsel | Grant | 6K | $0.00 | $0 | 24K |
| 2026-04-01 | Seraphin Luc | President and CEO | Tax withholding | 13K | $89.95 | $1.1M | 351K |
| 2026-04-01 | Seraphin Luc | President and CEO | Grant | 33K | $0.00 | $0 | 364K |
| 2026-04-01 | PENG VICTOR | Director | Grant | 2K | $0.00 | $0 | 2K |
| 2026-04-01 | LAUB STEVEN | Director | Grant | 2K | $0.00 | $0 | 9K |
| 2026-04-01 | KISSNER CHARLES | Director | Grant | 2K | $0.00 | $0 | 41K |
| 2026-04-01 | Higashi Emiko | Director | Grant | 2K | $0.00 | $0 | 65K |
| 2026-04-01 | FAN XIANZHI SEAN | EVP, COO | Tax withholding | 10K | $89.95 | $892K | 206K |
| 2026-04-01 | FAN XIANZHI SEAN | EVP, COO | Grant | 22K | $0.00 | $0 | 216K |
| 2026-04-01 | Allen John K | Chief Accounting Officer | Tax withholding | 658 | $89.95 | $59K | 18K |
| 2026-04-01 | Allen John K | Chief Accounting Officer | Tax withholding | 495 | $89.95 | $45K | 19K |
| 2026-04-01 | Allen John K | Chief Accounting Officer | Grant | 3K | $0.00 | $0 | 19K |
| 2026-03-10 | Shinn John | SVP, General Counsel | Sell | 200 | $89.55 | $18K | 18K |
| 2026-03-10 | Shinn John | SVP, General Counsel | Sell | 4K | $88.64 | $386K | 19K |
| 2026-03-03 | Shinn John | SVP, General Counsel | Sell | 700 | $94.89 | $66K | 23K |
| 2026-03-03 | Shinn John | SVP, General Counsel | Sell | 2K | $94.07 | $151K | 24K |
| 2026-03-03 | Shinn John | SVP, General Counsel | Sell | 2K | $92.77 | $209K | 25K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 1K | $101.65 | $132K | 331K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 7K | $100.20 | $660K | 332K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 9K | $99.17 | $939K | 339K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 14K | $98.22 | $1.3M | 348K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 7K | $97.38 | $704K | 362K |
| 2026-03-02 | Seraphin Luc | President and CEO | Sell | 2K | $95.83 | $161K | 369K |
| 2026-03-02 | PENG VICTOR | Director | Grant | 168 | $0.00 | $0 | 168 |
| 2026-02-23 | Lynch Desmond | SVP, CFO | Sell | 4K | $101.53 | $434K | 64K |
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.
Planned sales (Form 144)
Newest first. JSON24 Form 144 notices on file for RMBS worth $23.0M at the prices reported; 3 in the last 90 days worth $1.6M. Latest: KISSNER CHARLES filed on 2026-10-02 to sell 5,000 shares ($555K) from 2026-10-02.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-02 | KISSNER CHARLESDirector | 5K | $555K | 0.005% | 2026-10-02 | UBS Financial Services Inc. |
| 2026-09-22 | KISSNER CHARLESDirector | 5K | $525K | 0.005% | 2026-09-22 | UBS Financial Services Inc. |
| 2026-08-07 | KISSNER CHARLESDirector | 5K | $505K | 0.005% | 2026-08-07 | UBS Financial Services Inc. |
| 2026-06-03 | NECIP SAYINEROfficer | 5K | $851K | 0.005% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-02 | EMIKO HIGASHIDirector | 10K | $1.6M | 0.009% | 2026-06-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-01 | STANG FAMILY TRUSTAffiliate | 5K | $730K | 0.005% | 2026-06-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | EMIKO HIGASHIDirector | 5K | $788K | 0.005% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-26 | XIANZHI S FANOfficer | 38K | $5.8M | 0.035% | 2026-05-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-22 | JOHN SHINNOfficer | 1K | $144K | 0.001% | 2026-05-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-08 | NECIP SAYINERDirector | 10K | $1.3M | 0.009% | 2026-05-08 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-07 | STEVEN LAUBDirector | 2K | $188K | 0.001% | 2026-05-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-24 | MEERA RAODirector | 3K | $447K | 0.003% | 2026-04-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-14 | MEERA RAODirector | 9K | $1.0M | 0.008% | 2026-04-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-02 | LUC SERAPHINOfficer, Director | 5K | $470K | 0.005% | 2026-04-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-02 | DESMOND M LYNCHOfficer | 2K | $136K | 0.001% | 2026-04-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-10 | JOHN SHINNOfficer | 5K | $404K | 0.004% | 2026-03-10 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-03 | JOHN SHINNOfficer | 5K | $426K | 0.004% | 2026-03-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-02 | LUC SERAPHINOfficer, Director | 40K | $3.9M | 0.037% | 2026-03-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-23 | DESMOND M LYNCHOfficer | 4K | $434K | 0.004% | 2026-02-23 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-10 | STANG FAMILY TRUSTOfficer | 4K | $447K | 0.004% | 2025-11-10 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-11-07 | STANG FAMILY TRUSTOfficer | 5K | $512K | 0.005% | 2025-11-07 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-06 | DESMOND M LYNCHOfficer | 9K | $921K | 0.008% | 2025-10-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-10-01 | MEERA RAODirector | 653 | $67K | 0.001% | 2025-10-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-09-15 | DESMOND M LYNCHOfficer | 9K | $832K | 0.008% | 2025-09-15 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON6 holders report 5% or more of RMBS in their latest filing, all on Schedule 13G (passive). The largest reported stake is BlackRock, Inc. at 12.2% of the class (13,203,935 shares), filed 2026-07-29 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-29 | 13G/Ano. 6 | BlackRock, Inc.parent holding company | 13.2M | 12.2% | 2026-06-30 |
| 2026-06-05 | 13G | FMR LLCparent holding company | 11.3M | 10.4% | 2026-05-29 |
| 2026-06-05 | 13G | Abigail P. Johnsonindividual | 11.3M | 10.4% | 2026-05-29 |
| 2026-05-15 | 13G/Ano. 1 | T. Rowe Price Associates, Inc.investment adviser | 3.4M | 3.1% | 2026-03-31 |
| 2026-05-06 | 13G | Invesco Ltd.parent holding company, investment adviser | 6.5M | 6.0% | 2026-03-31 |
| 2026-04-30 | 13G | Vanguard Capital Managementinvestment adviser | 5.7M | 5.2% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 6.7M | 6.2% | 2026-03-31 |
| 2026-03-27 | 13G/Ano. 16 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding RMBS at their latest 13F. JSON8 of the 30 tracked managers held RMBS at their latest 13F, $513.3M in total at quarter-end prices. AQR Capital Management is the largest at $152.5M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| AQR Capital Management | 2026-06-30 | 1.2M | $152.5M | 0.05% | -39K |
| D. E. Shaw & Co. | 2026-06-30 | 740K | $98.2M | 0.05% | +727K |
| Fisher Asset Management | 2026-06-30 | 706K | $93.7M | 0.03% | -33K |
| Millennium Management | 2026-06-30 | 473K | $62.8M | 0.02% | +332K |
| Citadel Advisors | 2026-06-30 | 400K | $53.1M | 0.01% | +384K |
| Two Sigma Investments | 2026-06-30 | 223K | $29.6M | 0.02% | +146K |
| Duquesne Family Office | 2026-06-30 | 173K | $23.0M | 0.44% | new |
| Bridgewater Associates | 2026-06-30 | 4K | $514K | 0.00% | -48K |
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 FY 2025 it generated $360.0M of operating cash flow and spent $7.1M on buybacks.
- Cash
- $134.3M
- Equity
- $1.39B
- Total assets
- $1.53B
- Shares outstanding
- 108,136,967
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q1 FY 2026 | 2026-03-31 | n/a | $59.9M | n/a | 0.55 |
| Q4 FY 2025derived | 2025-12-31 | n/a | $63.8M | n/a | n/a |
| Q3 FY 2025 | 2025-09-30 | n/a | $48.4M | n/a | 0.44 |
| Q2 FY 2025 | 2025-06-30 | n/a | $57.9M | n/a | 0.53 |
| Q1 FY 2025 | 2025-03-31 | n/a | $60.3M | n/a | 0.56 |
| Q4 FY 2024derived | 2024-12-31 | n/a | $62.2M | n/a | n/a |
| Q3 FY 2024 | 2024-09-30 | n/a | $48.7M | n/a | 0.45 |
| Q2 FY 2024 | 2024-06-30 | n/a | $36.1M | n/a | 0.33 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | n/a | $230.5M | $360.0M | $26.8M | $7.1M | n/a |
| FY 2024 | 2024-12-31 | n/a | $179.8M | $230.6M | $30.7M | $113.3M | n/a |
| FY 2023 | 2023-12-31 | n/a | $333.9M | $195.8M | $23.2M | $100.5M | n/a |
| FY 2022 | 2022-12-31 | n/a | -$14.3M | $230.4M | $17.5M | $100.4M | n/a |
| FY 2021 | 2021-12-31 | n/a | $18.3M | $209.2M | $13.8M | $100.1M | 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 2026-03-31; shares outstanding as of 2026-03-31 from the cover page.
What this page is
Rambus 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 Rambus (RMBS), SEC CIK 917273, listed on Nasdaq, classified by the SEC as semiconductors & related devices. 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 2026-09-11.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-02.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-07-29.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 2026-03-31.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 2026-07-27.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 2026-10-02.JSON and CSV
- Company record
- EDGAR filing index for CIK 917273Ticker, 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 RMBS is sold short?
What is RMBS's daily short volume?
Does RMBS have fails to deliver?
Are RMBS insiders buying or selling?
Have RMBS insiders filed to sell?
Who owns 5% or more of RMBS?
What did RMBS report last quarter?
Which tracked 13F managers own RMBS?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.