Inhibrx Biosciences (INBX)
Inhibrx Biosciences on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq.
3.4M
Short interest
settlement 2026-09-15
8.3
Days to cover
-2.1 days vs prior
47.8%
Short share of volume
2026-10-08
61
Fails to deliver
settlement 2026-08-27
Fri 13 Nov
Next earnings
estimated date
2 people
Insiders buying, 30 days
$2.0M combined, latest 2026-09-28
$5.2M
Insider flow, 90 days
14 buys, 5 sells
As of 2026-10-08.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 15 September 2026, short interest in INBX is 3,393,511 shares, up 178,281 shares over the last month. Over the last 48 readings it ranged from 524,531 shares (30 September 2025) to 3,447,032 shares (30 June 2026). The latest reading sits at the top of that range. At the reported average volume of 408K shares a day that is 8.3 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/inbx" 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 |
|---|---|---|---|---|
| 2026-09-15 | 3,393,511 | +2.9% | 408,480 | 8.31 |
| 2026-08-31 | 3,297,743 | +2.6% | 317,496 | 10.39 |
| 2026-08-14 | 3,215,230 | -3.8% | 223,490 | 14.39 |
| 2026-07-31 | 3,341,210 | -2.7% | 213,594 | 15.64 |
| 2026-07-15 | 3,433,872 | -0.4% | 379,873 | 9.04 |
| 2026-06-30 | 3,447,032 | +4.5% | 347,713 | 9.91 |
| 2026-06-15 | 3,299,693 | +3.8% | 321,930 | 10.25 |
| 2026-05-29 | 3,179,335 | +8.4% | 341,252 | 9.32 |
| 2026-05-15 | 2,932,658 | +7.3% | 654,241 | 4.48 |
| 2026-04-30 | 2,733,548 | +27.9% | 687,984 | 3.97 |
| 2026-04-15 | 2,136,978 | +0.8% | 246,794 | 8.66 |
| 2026-03-31 | 2,119,421 | +13.7% | 247,014 | 8.58 |
| 2026-03-13 | 1,864,224 | +7.9% | 179,297 | 10.40 |
| 2026-02-27 | 1,727,284 | -0.4% | 153,759 | 11.23 |
| 2026-02-13 | 1,734,575 | -0.2% | 156,185 | 11.11 |
| 2026-01-30 | 1,737,927 | +5.3% | 243,093 | 7.15 |
| 2026-01-15 | 1,650,847 | -3.6% | 167,640 | 9.85 |
| 2025-12-31 | 1,712,725 | +63.1% | 277,794 | 6.17 |
| 2025-12-15 | 1,049,942 | -20.5% | 196,978 | 5.33 |
| 2025-11-28 | 1,321,190 | +16.3% | 259,844 | 5.08 |
| 2025-11-14 | 1,136,139 | +10.7% | 346,540 | 3.28 |
| 2025-10-31 | 1,026,055 | +92.6% | 1,026,597 | 1.00 |
| 2025-10-15 | 532,661 | +1.6% | 161,268 | 3.30 |
| 2025-09-30 | 524,531 | -27.3% | 149,004 | 3.52 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 8 October 2026, the short share of INBX volume is 47.8%, down 18.8 points over the last five sessions. Over the last 30 readings it ranged from 39.6% (5 October 2026) to 84.1% (21 September 2026). The latest reading is 15.1 points below the 30-session average of 62.9%, on 67K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-08 | 32K | 67K | 47.8% | 0 |
| 2026-10-07 | 36K | 56K | 64.1% | 0 |
| 2026-10-06 | 34K | 60K | 56.9% | 30 |
| 2026-10-05 | 35K | 87K | 39.6% | 1,559 |
| 2026-10-02 | 61K | 84K | 73.4% | 0 |
| 2026-10-01 | 58K | 87K | 66.6% | 0 |
| 2026-09-30 | 66K | 85K | 77.8% | 0 |
| 2026-09-29 | 29K | 64K | 45.6% | 0 |
| 2026-09-28 | 33K | 52K | 64.3% | 0 |
| 2026-09-25 | 37K | 59K | 62.5% | 0 |
| 2026-09-24 | 45K | 91K | 49.9% | 4,240 |
| 2026-09-23 | 107K | 147K | 72.5% | 800 |
| 2026-09-22 | 85K | 105K | 80.4% | 112 |
| 2026-09-21 | 72K | 86K | 84.1% | 84 |
| 2026-09-18 | 48K | 78K | 60.9% | 0 |
| 2026-09-17 | 39K | 67K | 57.6% | 0 |
| 2026-09-16 | 62K | 116K | 53.9% | 0 |
| 2026-09-15 | 66K | 96K | 69.2% | 0 |
| 2026-09-14 | 36K | 81K | 43.7% | 0 |
| 2026-09-11 | 51K | 81K | 63.3% | 0 |
| 2026-09-10 | 86K | 131K | 65.7% | 0 |
| 2026-09-09 | 163K | 260K | 62.9% | 8,411 |
| 2026-09-08 | 456K | 622K | 73.2% | 30,995 |
| 2026-09-04 | 46K | 65K | 70.4% | 0 |
| 2026-09-03 | 35K | 51K | 67.8% | 0 |
| 2026-09-02 | 43K | 67K | 64.4% | 50 |
| 2026-09-01 | 52K | 92K | 56.8% | 0 |
| 2026-08-31 | 85K | 121K | 69.8% | 50 |
| 2026-08-28 | 75K | 101K | 74.6% | 0 |
| 2026-08-27 | 62K | 128K | 48.3% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 27 August 2026, the fails-to-deliver balance in INBX is 61 shares, up 59 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (20 August 2026) to 11,122 shares (6 March 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-27 | 61 | $125.34 | $8K |
| 2026-08-20 | 2 | $101.48 | $203 |
| 2026-08-14 | 14 | $97.01 | $1K |
| 2026-07-17 | 98 | $89.07 | $9K |
| 2026-07-09 | 1,052 | $97.10 | $102K |
| 2026-06-30 | 2,433 | $95.50 | $232K |
| 2026-06-25 | 21 | $95.14 | $2K |
| 2026-06-24 | 2,471 | $92.91 | $230K |
| 2026-06-23 | 222 | $93.30 | $21K |
| 2026-06-22 | 733 | $93.05 | $68K |
| 2026-06-18 | 135 | $94.20 | $13K |
| 2026-06-16 | 38 | $93.51 | $4K |
| 2026-06-11 | 2,360 | $89.47 | $211K |
| 2026-06-08 | 1,930 | $87.01 | $168K |
| 2026-06-02 | 59 | $99.29 | $6K |
| 2026-05-19 | 106 | $105.80 | $11K |
| 2026-05-18 | 2,495 | $108.64 | $271K |
| 2026-04-27 | 9,973 | $129.06 | $1.3M |
| 2026-04-23 | 920 | $115.09 | $106K |
| 2026-04-13 | 13 | $75.27 | $979 |
| 2026-04-10 | 20 | $75.75 | $2K |
| 2026-04-09 | 16 | $67.13 | $1K |
| 2026-04-02 | 1,214 | $67.05 | $81K |
| 2026-03-23 | 108 | $60.92 | $7K |
| 2026-03-17 | 21 | $69.26 | $1K |
| 2026-03-06 | 11,122 | $70.66 | $786K |
| 2026-03-03 | 90 | $77.49 | $7K |
| 2026-02-20 | 35 | $81.08 | $3K |
| 2026-02-09 | 92 | $83.91 | $8K |
| 2026-02-03 | 20 | $82.23 | $2K |
Insider trades
SEC Form 4, newest first, 50 of 63 shown. JSONOver the last 90 days INBX insiders reported 14 open-market buys ($5.5M) against 5 sells ($279K), so the dollar flow leans toward buying. Latest filing: Lappe Mark (Chief Executive Officer) on 2026-09-28.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-28 | Lappe Mark | Chief Executive Officer | Buy | 3K | $101.70 | $305K | 741K |
| 2026-09-28 | Lappe Mark | Chief Executive Officer | Buy | 2K | $98.88 | $148K | 738K |
| 2026-09-25 | Lappe Mark | Chief Executive Officer | Buy | 2K | $99.60 | $217K | 736K |
| 2026-09-25 | Lappe Mark | Chief Executive Officer | Buy | 3K | $98.87 | $329K | 734K |
| 2026-09-23 | Kayyem Jon Faiz | Director | Buy | 5K | $100.00 | $500K | 434K |
| 2026-09-16 | Kayyem Jon Faiz | Director | Buy | 5K | $100.00 | $500K | 429K |
| 2026-09-15 | MANHARD KIMBERLY | Director | Sell | 500 | $105.05 | $53K | 8K |
| 2026-09-14 | MANHARD KIMBERLY | Director | Sell | 500 | $110.26 | $55K | 8K |
| 2026-09-11 | MANHARD KIMBERLY | Director | Sell | 500 | $111.78 | $56K | 9K |
| 2026-09-09 | MANHARD KIMBERLY | Director | Sell | 500 | $115.80 | $58K | 9K |
| 2026-09-08 | MANHARD KIMBERLY | Director | Sell | 500 | $115.14 | $58K | 10K |
| 2026-09-08 | Kayyem Jon Faiz | Director | Buy | 5K | $113.52 | $568K | 424K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 10K | $112.28 | $1.1M | 731K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 1K | $111.88 | $136K | 721K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 500 | $108.23 | $54K | 720K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 1K | $107.12 | $118K | 719K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 7K | $100.64 | $665K | 718K |
| 2026-09-08 | Lappe Mark | Chief Executive Officer | Buy | 6K | $99.29 | $585K | 711K |
| 2026-09-08 | FORSYTH DOUGLAS | Director | Buy | 3K | $114.65 | $287K | 227K |
| 2025-10-07 | Viking Global Opportunities Parent GP LLC | TenPercentOwner | Sell | 25K | $32.25 | $808K | 103K |
| 2025-10-07 | Viking Global Opportunities Parent GP LLC | TenPercentOwner | Sell | 309K | $32.25 | $10.0M | 1.3M |
| 2025-10-07 | Viking Global Opportunities Parent GP LLC | TenPercentOwner | Sell | 16K | $32.25 | $526K | 67K |
| 2025-10-07 | VIKING GLOBAL INVESTORS LP | 10% owner | Sell | 25K | $32.25 | $808K | 103K |
| 2025-10-07 | VIKING GLOBAL INVESTORS LP | 10% owner | Sell | 16K | $32.25 | $526K | 67K |
| 2025-10-07 | VIKING GLOBAL INVESTORS LP | 10% owner | Sell | 309K | $32.25 | $10.0M | 1.3M |
| 2025-03-27 | Kayyem Jon Faiz | Director | Gift | 90K | $0.00 | $0 | 419K |
| 2024-12-16 | Kayyem Jon Faiz | Director | Gift | 250K | $0.00 | $0 | 250K |
| 2024-12-16 | Kayyem Jon Faiz | Director | Gift | 500K | $0.00 | $0 | 509K |
| 2024-12-16 | Kayyem Jon Faiz | Director | Gift | 250K | $0.00 | $0 | 250K |
| 2024-12-06 | Kayyem Jon Faiz | Director | Gift | 52K | $0.00 | $0 | 1.0M |
| 2024-11-20 | Kayyem Jon Faiz | Director | Buy | 19K | $14.19 | $266K | 70K |
| 2024-11-20 | Kayyem Jon Faiz | Director | Buy | 19K | $14.19 | $266K | 70K |
| 2024-11-19 | Kayyem Jon Faiz | Director | Buy | 35K | $14.23 | $496K | 51K |
| 2024-11-19 | Kayyem Jon Faiz | Director | Buy | 35K | $14.23 | $496K | 51K |
| 2024-10-03 | Vuori Kristiina MD | Director | Buy | 7K | $15.00 | $100K | 20K |
| 2024-09-16 | Lappe Mark | Chief Executive Officer | Buy | 13K | $17.13 | $223K | 706K |
| 2024-09-12 | Lappe Mark | Chief Executive Officer | Buy | 27K | $15.05 | $406K | 693K |
| 2024-09-11 | Vuori Kristiina MD | Director | Buy | 6K | $15.07 | $97K | 14K |
| 2024-09-10 | Lappe Mark | Chief Executive Officer | Buy | 9K | $15.19 | $129K | 666K |
| 2024-09-10 | Vuori Kristiina MD | Director | Buy | 179 | $15.00 | $3K | 7K |
| 2024-09-09 | Lappe Mark | Chief Executive Officer | Buy | 10K | $15.21 | $144K | 657K |
| 2024-09-06 | Lappe Mark | Chief Executive Officer | Buy | 26K | $15.29 | $398K | 648K |
| 2024-09-03 | Lappe Mark | Chief Executive Officer | Buy | 15K | $15.66 | $239K | 160K |
| 2024-09-03 | Lappe Mark | Chief Executive Officer | Buy | 5K | $16.31 | $77K | 165K |
| 2024-08-30 | Lappe Mark | Chief Executive Officer | Buy | 10K | $14.02 | $140K | 145K |
| 2024-08-29 | Vuori Kristiina MD | Director | Buy | 7K | $14.00 | $100K | 7K |
| 2024-08-29 | Lappe Mark | Chief Executive Officer | Buy | 10K | $14.03 | $140K | 135K |
| 2024-08-28 | MANHARD KIMBERLY | Director | Buy | 10K | $13.98 | $140K | 10K |
| 2024-08-23 | FORSYTH DOUGLAS | Director | Buy | 60K | $14.07 | $842K | 225K |
| 2024-08-22 | FORSYTH DOUGLAS | Director | Buy | 15K | $12.89 | $196K | 165K |
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. JSON5 Form 144 notices on file for INBX worth $279K at the prices reported; 5 in the last 90 days worth $279K. Latest: MANHARD KIMBERLY filed on 2026-09-15 to sell 500 shares ($53K) from 2026-09-15.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-15 | MANHARD KIMBERLYDirector | 500 | $53K | 0.003% | 2026-09-15 | Fidelity Brokerage Services LLC |
| 2026-09-14 | MANHARD KIMBERLYDirector | 500 | $55K | 0.003% | 2026-09-14 | Fidelity Brokerage Services LLC |
| 2026-09-11 | MANHARD KIMBERLYDirector | 500 | $56K | 0.003% | 2026-09-11 | Fidelity Brokerage Services LLC |
| 2026-09-09 | MANHARD KIMBERLYDirector | 500 | $58K | 0.003% | 2026-09-09 | Fidelity Brokerage Services LLC |
| 2026-09-08 | MANHARD KIMBERLYDirector | 500 | $58K | 0.003% | 2026-09-08 | Fidelity Brokerage Services LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON16 holders report 5% or more of INBX in their latest filing, all on Schedule 13G (passive). The largest reported stake is Perceptive Life Sciences Master Fund, Ltd. at 10.0% of the class (1,489,443 shares), filed 2026-08-14 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-14 | 13G | Schonfeld Strategic Advisors LLCinvestment adviser | 782K | 5.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Perceptive Life Sciences Master Fund, Ltd.corporation | 1.5M | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Perceptive Advisors LLCinvestment adviser | 1.5M | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Joseph Edelmanindividual | 1.5M | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Shabet Rose Sharonindividual | 1.4M | 9.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | VIKING GLOBAL INVESTORS LPpartnership | 1.4M | 9.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Parent GP LLCother entity | 1.4M | 9.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | HALVORSEN OLE ANDREASindividual | 1.4M | 9.3% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities GP LLCother entity | 1.3M | 8.7% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Portfolio GP LLCother entity | 1.3M | 8.4% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Illiquid Investments Sub-Master LPpartnership | 1.3M | 8.4% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Drawdown Portfolio GP LLCother entity | 80K | 0.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Drawdown GP LLCother entity | 80K | 0.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | Viking Global Opportunities Drawdown (Aggregator) LPpartnership | 80K | 0.5% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 3 | KAVRA 104 LLCother entity | 52K | 0.4% | 2026-06-30 |
| 2026-08-03 | 13G | BANK OF AMERICA CORP /DE/parent holding company | 857K | 5.9% | 2026-06-30 |
| 2026-02-17 | 13G/Ano. 1 | Ott David C.individual | 1.5M | 10.0% | 2025-12-31 |
| 2026-02-11 | 13G | Morgan Stanleyparent holding company, corporation | 1.2M | 7.9% | 2025-12-31 |
| 2026-02-11 | 13G | Morgan Stanley Capital Services LLCbroker-dealer, corporation | 918K | 6.3% | 2025-12-31 |
| 2026-01-21 | 13G | BlackRock, Inc.parent holding company | 768K | 5.3% | 2025-12-31 |
13F holders
Tracked managers holding INBX at their latest 13F. JSON6 of the 30 tracked managers held INBX at their latest 13F, $132.0M in total at quarter-end prices. Viking Global Investors is the largest at $106.5M (0.3% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Viking Global Investors | 2026-06-30 | 1.1M | $106.5M | 0.30% | -314K |
| Millennium Management | 2026-06-30 | 147K | $13.9M | 0.01% | -181K |
| Renaissance Technologies | 2026-06-30 | 62K | $5.9M | 0.01% | +12K |
| Point72 Asset Management | 2026-06-30 | 26K | $2.5M | 0.00% | new |
| D. E. Shaw & Co. | 2026-06-30 | 22K | $2.1M | 0.00% | -55K |
| AQR Capital Management | 2026-06-30 | 11K | $1.1M | 0.00% | +3K |
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.
What this page is
Inhibrx Biosciences 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 Inhibrx Biosciences (INBX), SEC CIK 2007919, listed on Nasdaq. 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 2026-09-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-08.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-27.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 2026-09-15.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 2026-08-14.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
- 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 2026-08-13.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 2026-09-28.JSON and CSV
- Company record
- EDGAR filing index for CIK 2007919Ticker, 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 INBX is sold short?
What is INBX's daily short volume?
Does INBX have fails to deliver?
Are INBX insiders buying or selling?
Have INBX insiders filed to sell?
Who owns 5% or more of INBX?
Which tracked 13F managers own INBX?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.