Moleculin Biotech (MBRX)
Moleculin Biotech on one page: short interest, daily short volume, fails to deliver, large holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.
126K
Short interest
settlement 2026-10-15
1.0
Days to cover
unchanged vs prior
34.9%
Short share of volume
2026-11-02
1,130
Fails to deliver
settlement 2026-10-13
Tue 10 Nov
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in MBRX is 126,324 shares, down 161,284 shares over the last month. Over the last 48 readings it ranged from 20,655 shares (29 November 2024) to 8,714,591 shares (31 October 2025). The latest reading sits at the bottom of that range. At the reported average volume of 354K shares a day that is 1.0 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/mbrx" 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 |
|---|---|---|---|---|
| 2026-10-15 | 126,324 | -38.3% | 354,271 | 1.00 |
| 2026-09-30 | 204,583 | -28.9% | 1,712,392 | 1.00 |
| 2026-09-15 | 287,608 | +61.5% | 652,899 | 1.00 |
| 2026-08-31 | 178,126 | -43.7% | 691,114 | 1.00 |
| 2026-08-14 | 316,392 | -79.9% | 2,216,181 | 1.00 |
| 2026-07-31 | 1,577,365 | +49.6% | 1,913,836 | 1.00 |
| 2026-07-15 | 1,054,620 | -25.4% | 246,906 | 4.27 |
| 2026-06-30 | 1,413,550 | +22.4% | 1,882,377 | 1.00 |
| 2026-06-15 | 1,154,952 | +39.3% | 228,152 | 5.06 |
| 2026-05-29 | 828,958 | +57.1% | 263,322 | 3.15 |
| 2026-05-15 | 527,786 | +57.9% | 249,100 | 2.12 |
| 2026-04-30 | 334,361 | +141.0% | 129,869 | 2.57 |
| 2026-04-15 | 138,763 | +21.8% | 83,076 | 1.67 |
| 2026-03-31 | 113,910 | +4.0% | 104,010 | 1.10 |
| 2026-03-13 | 109,555 | -42.7% | 152,358 | 1.00 |
| 2026-02-27 | 191,156 | -56.7% | 435,180 | 1.00 |
| 2026-02-13 | 441,371 | +2.9% | 69,223 | 6.38 |
| 2026-01-30 | 429,080 | +19.8% | 116,283 | 3.69 |
| 2026-01-15 | 358,088 | +108.8% | 156,481 | 2.29 |
| 2025-12-31 | 171,538 | -2.5% | 648,859 | 1.00 |
| 2025-12-15 | 175,916 | -95.3% | 444,086 | 1.00 |
| 2025-11-28 | 3,784,612 | -28.4% | 2,577,417 | 1.47 |
| 2025-11-14 | 5,289,424 | -39.3% | 4,122,334 | 1.28 |
| 2025-10-31 | 8,714,591 | +122.4% | 5,620,372 | 1.55 |
| 2025-10-15 | 3,918,043 | +38.8% | 2,221,795 | 1.76 |
| 2025-09-30 | 2,822,788 | +20.2% | 2,948,495 | 1.00 |
| 2025-09-15 | 2,347,632 | -15.1% | 2,893,046 | 1.00 |
| 2025-08-29 | 2,764,990 | -16.1% | 6,578,030 | 1.00 |
| 2025-08-15 | 3,297,491 | -18.8% | 1,171,542 | 2.81 |
| 2025-07-31 | 4,062,686 | -22.3% | 4,707,337 | 1.00 |
| 2025-07-15 | 5,230,256 | +51.9% | 15,719,130 | 1.00 |
| 2025-06-30 | 3,443,171 | +78.0% | 8,944,650 | 1.00 |
| 2025-06-13 | 1,933,860 | +220.7% | 1,670,752 | 1.16 |
| 2025-05-30 | 602,992 | -38.6% | 197,222 | 3.06 |
| 2025-05-15 | 981,942 | +35.4% | 452,488 | 2.17 |
| 2025-04-30 | 725,045 | +55.9% | 359,424 | 2.02 |
| 2025-04-15 | 465,162 | -18.7% | 287,588 | 1.62 |
| 2025-03-31 | 572,100 | +23.4% | 699,735 | 1.00 |
| 2025-03-14 | 463,550 | -57.1% | 849,625 | 1.00 |
| 2025-02-28 | 1,081,543 | -50.8% | 8,828,575 | 1.00 |
| 2025-02-14 | 2,196,108 | +1167.5% | 24,861,310 | 1.00 |
| 2025-01-31 | 173,263 | +2.0% | 28,758 | 6.02 |
| 2025-01-15 | 169,866 | +106.8% | 46,749 | 3.63 |
| 2024-12-31 | 82,126 | +139.2% | 78,670 | 1.04 |
| 2024-12-13 | 34,328 | +66.2% | 52,610 | 1.00 |
| 2024-11-29 | 20,655 | -61.8% | 39,098 | 1.00 |
| 2024-11-15 | 54,134 | -55.8% | 82,964 | 1.00 |
| 2024-10-31 | 122,380 | -28.6% | 20,343 | 6.02 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of MBRX volume is 34.9%, up 1.4 points over the last five sessions. Over the last 30 readings it ranged from 26.1% (8 October 2026) to 68.2% (27 October 2026). The latest reading is 12.6 points below the 30-session average of 47.5%, on 6K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 2K | 6K | 34.9% | 0 |
| 2026-10-30 | 8K | 17K | 46.0% | 0 |
| 2026-10-29 | 12K | 19K | 62.9% | 1,291 |
| 2026-10-28 | 28K | 51K | 54.9% | 683 |
| 2026-10-27 | 63K | 93K | 68.2% | 0 |
| 2026-10-26 | 3K | 9K | 33.5% | 0 |
| 2026-10-23 | 6K | 9K | 67.9% | 2,133 |
| 2026-10-22 | 19K | 40K | 48.1% | 2,456 |
| 2026-10-21 | 10K | 20K | 50.2% | 0 |
| 2026-10-20 | 63K | 101K | 62.3% | 12,360 |
| 2026-10-19 | 154K | 483K | 31.9% | 37,570 |
| 2026-10-16 | 177K | 679K | 26.1% | 21,515 |
| 2026-10-15 | 52K | 182K | 28.7% | 261 |
| 2026-10-14 | 45K | 113K | 40.0% | 0 |
| 2026-10-13 | 78K | 123K | 63.3% | 0 |
| 2026-10-12 | 71K | 110K | 64.5% | 0 |
| 2026-10-09 | 122K | 199K | 61.5% | 0 |
| 2026-10-08 | 44K | 170K | 26.1% | 0 |
| 2026-10-07 | 79K | 208K | 38.1% | 5,010 |
| 2026-10-06 | 243K | 441K | 55.2% | 0 |
| 2026-10-05 | 93K | 232K | 40.1% | 10 |
| 2026-10-02 | 89K | 282K | 31.5% | 0 |
| 2026-10-01 | 122K | 203K | 60.1% | 0 |
| 2026-09-30 | 226K | 411K | 54.9% | 0 |
| 2026-09-29 | 446K | 1.2M | 38.0% | 38,552 |
| 2026-09-28 | 113K | 351K | 32.3% | 20,672 |
| 2026-09-25 | 853K | 1.7M | 50.8% | 1,266 |
| 2026-09-24 | 168K | 298K | 56.4% | 22,673 |
| 2026-09-23 | 282K | 671K | 42.1% | 6,435 |
| 2026-09-22 | 2.0M | 3.7M | 54.0% | 247,054 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 13 October 2026, the fails-to-deliver balance in MBRX is 1,130 shares, down 11,504 shares over the last settlement date. Over the last 30 readings it ranged from 10 shares (10 September 2026) to 234,280 shares (31 July 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-13 | 1,130 | $0.41 | $463 |
| 2026-10-02 | 12,634 | $0.50 | $6K |
| 2026-09-24 | 5,132 | $0.53 | $3K |
| 2026-09-23 | 49,019 | $0.57 | $28K |
| 2026-09-17 | 40 | $0.74 | $30 |
| 2026-09-10 | 10 | $0.77 | $8 |
| 2026-09-08 | 86 | $0.71 | $61 |
| 2026-09-04 | 83 | $0.68 | $56 |
| 2026-09-03 | 646 | $0.69 | $446 |
| 2026-09-02 | 663 | $0.65 | $431 |
| 2026-09-01 | 319 | $0.64 | $204 |
| 2026-08-31 | 513 | $0.65 | $333 |
| 2026-08-28 | 571 | $0.69 | $394 |
| 2026-08-26 | 44,846 | $0.61 | $27K |
| 2026-08-18 | 104,982 | $0.61 | $64K |
| 2026-08-17 | 5,000 | $0.61 | $3K |
| 2026-08-12 | 452 | $0.45 | $203 |
| 2026-08-11 | 18,453 | $0.43 | $8K |
| 2026-08-06 | 9,069 | $0.39 | $4K |
| 2026-08-04 | 1,192 | $0.43 | $513 |
| 2026-08-03 | 120,305 | $0.40 | $48K |
| 2026-07-31 | 234,280 | $1.02 | $239K |
| 2026-07-30 | 172,268 | $1.36 | $234K |
| 2026-07-28 | 741 | $2.19 | $2K |
| 2026-07-27 | 2,735 | $2.12 | $6K |
| 2026-07-24 | 618 | $2.08 | $1K |
| 2026-07-22 | 884 | $2.15 | $2K |
| 2026-07-21 | 1,730 | $2.14 | $4K |
| 2026-07-20 | 1,027 | $2.10 | $2K |
| 2026-07-17 | 3,825 | $2.17 | $8K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for MBRX in the last 90 days. The most recent filings are listed below. Latest filing: Foster Jonathan P. (Chief Financial Officer) on 2026-10-15.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-15 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 30K | $0.37 | $11K | 405K |
| 2026-10-15 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 130K | price not stated in the filing | not stated | 436K |
| 2026-10-15 | KLEMP WALTER V | CEO and President | Tax withholding | 49K | $0.37 | $18K | 723K |
| 2026-10-15 | KLEMP WALTER V | CEO and President | Exercise or conversion | 208K | price not stated in the filing | not stated | 772K |
| 2026-08-03 | PICKER DONALD H | Chief Science Officer | Buy | 173K | $0.75 | $130K | 174K |
| 2026-08-03 | KLEMP WALTER V | CEO and President | Buy | 533K | $0.75 | $400K | 564K |
| 2026-08-03 | Foster Jonathan P. | Chief Financial Officer | Buy | 293K | $0.75 | $220K | 306K |
| 2026-06-22 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 41 | $3.12 | $128 | 12K |
| 2026-06-22 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 174 | price not stated in the filing | not stated | 12K |
| 2026-06-22 | KLEMP WALTER V | CEO and President | Tax withholding | 88 | $3.12 | $275 | 31K |
| 2026-06-22 | KLEMP WALTER V | CEO and President | Exercise or conversion | 360 | price not stated in the filing | not stated | 31K |
| 2026-06-22 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 71 | price not stated in the filing | not stated | 774 |
| 2026-06-22 | PICKER DONALD H | Chief Science Officer | Tax withholding | 21 | $3.12 | $66 | 753 |
| 2026-06-20 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 31 | $2.88 | $89 | 12K |
| 2026-06-20 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 109 | price not stated in the filing | not stated | 12K |
| 2026-06-20 | KLEMP WALTER V | CEO and President | Exercise or conversion | 150 | price not stated in the filing | not stated | 31K |
| 2026-06-20 | KLEMP WALTER V | CEO and President | Tax withholding | 37 | $2.88 | $107 | 31K |
| 2026-06-20 | PICKER DONALD H | Chief Science Officer | Tax withholding | 13 | $2.88 | $37 | 703 |
| 2026-06-20 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 44 | price not stated in the filing | not stated | 716 |
| 2025-11-04 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 5K | $0.50 | $3K | 303K |
| 2025-11-04 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 21K | price not stated in the filing | not stated | 308K |
| 2025-11-04 | KLEMP WALTER V | CEO and President | Tax withholding | 7K | $0.50 | $4K | 765K |
| 2025-11-04 | KLEMP WALTER V | CEO and President | Exercise or conversion | 29K | price not stated in the filing | not stated | 772K |
| 2025-11-04 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 9K | price not stated in the filing | not stated | 19K |
| 2025-11-04 | PICKER DONALD H | Chief Science Officer | Tax withholding | 2K | $0.50 | $1K | 17K |
| 2025-06-23 | KLEMP WALTER V | CEO and President | Buy | 676K | $0.37 | $250K | 744K |
| 2025-06-23 | Foster Jonathan P. | Chief Financial Officer | Buy | 270K | $0.37 | $100K | 288K |
| 2025-06-22 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 2K | price not stated in the filing | not stated | 11K |
| 2025-06-22 | PICKER DONALD H | Chief Science Officer | Tax withholding | 430 | $0.27 | $116 | 10K |
| 2025-06-22 | KLEMP WALTER V | CEO and President | Exercise or conversion | 9K | price not stated in the filing | not stated | 70K |
| 2025-06-22 | KLEMP WALTER V | CEO and President | Tax withholding | 2K | $0.27 | $591 | 68K |
| 2025-06-22 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 4K | price not stated in the filing | not stated | 18K |
| 2025-06-22 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 1K | $0.27 | $285 | 17K |
| 2025-06-20 | PICKER DONALD H | Chief Science Officer | Tax withholding | 263 | $0.27 | $71 | 9K |
| 2025-06-20 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 1K | price not stated in the filing | not stated | 9K |
| 2025-06-20 | KLEMP WALTER V | CEO and President | Tax withholding | 914 | $0.27 | $247 | 61K |
| 2025-06-20 | KLEMP WALTER V | CEO and President | Exercise or conversion | 4K | price not stated in the filing | not stated | 62K |
| 2025-06-20 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 661 | $0.27 | $178 | 14K |
| 2025-06-20 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 3K | price not stated in the filing | not stated | 15K |
| 2025-06-16 | KLEMP WALTER V | CEO and President | Tax withholding | 406 | $0.69 | $280 | 58K |
| 2025-06-16 | KLEMP WALTER V | CEO and President | Exercise or conversion | 2K | price not stated in the filing | not stated | 59K |
| 2025-06-16 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 833 | price not stated in the filing | not stated | 12K |
| 2025-06-16 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 203 | $0.69 | $140 | 12K |
| 2024-07-02 | KLEMP WALTER V | CEO and President | Exercise or conversion | 982 | price not stated in the filing | not stated | 57K |
| 2024-07-02 | KLEMP WALTER V | CEO and President | Tax withholding | 240 | $3.57 | $857 | 57K |
| 2024-06-22 | KLEMP WALTER V | CEO and President | Exercise or conversion | 9K | price not stated in the filing | not stated | 58K |
| 2024-06-22 | KLEMP WALTER V | CEO and President | Tax withholding | 2K | $3.74 | $8K | 56K |
| 2024-06-22 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 4K | price not stated in the filing | not stated | 12K |
| 2024-06-22 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 1K | $3.74 | $4K | 11K |
| 2024-06-22 | PICKER DONALD H | Chief Science Officer | Tax withholding | 524 | $3.74 | $2K | 8K |
| 2024-06-22 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 2K | price not stated in the filing | not stated | 9K |
| 2024-06-20 | KLEMP WALTER V | CEO and President | Tax withholding | 914 | $3.78 | $3K | 49K |
| 2024-06-20 | KLEMP WALTER V | CEO and President | Exercise or conversion | 4K | price not stated in the filing | not stated | 50K |
| 2024-06-20 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 636 | $3.78 | $2K | 8K |
| 2024-06-20 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 3K | price not stated in the filing | not stated | 9K |
| 2024-06-20 | PICKER DONALD H | Chief Science Officer | Tax withholding | 320 | $3.78 | $1K | 7K |
| 2024-06-20 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 1K | price not stated in the filing | not stated | 7K |
| 2024-06-16 | KLEMP WALTER V | CEO and President | Tax withholding | 406 | $4.14 | $2K | 47K |
| 2024-06-16 | KLEMP WALTER V | CEO and President | Exercise or conversion | 2K | price not stated in the filing | not stated | 47K |
| 2024-06-16 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 196 | $4.14 | $811 | 6K |
| 2024-06-16 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 834 | price not stated in the filing | not stated | 6K |
| 2023-12-26 | KLEMP WALTER V | CEO and President | Buy | 188K | $0.69 | $130K | 681K |
| 2023-12-26 | George Robert E. | Director | Buy | 14K | $0.69 | $10K | 15K |
| 2023-12-26 | Foster Jonathan P. | Chief Financial Officer | Buy | 29K | $0.69 | $20K | 81K |
| 2023-07-11 | KLEMP WALTER V | CEO and President | Exercise or conversion | 13K | price not stated in the filing | not stated | 496K |
| 2023-07-11 | KLEMP WALTER V | CEO and President | Tax withholding | 3K | $0.59 | $2K | 492K |
| 2023-07-02 | KLEMP WALTER V | CEO and President | Tax withholding | 4K | $0.58 | $2K | 482K |
| 2023-07-02 | KLEMP WALTER V | CEO and President | Exercise or conversion | 15K | price not stated in the filing | not stated | 486K |
| 2023-06-20 | KLEMP WALTER V | CEO and President | Tax withholding | 14K | $0.57 | $8K | 471K |
| 2023-06-20 | KLEMP WALTER V | CEO and President | Exercise or conversion | 56K | price not stated in the filing | not stated | 485K |
| 2023-06-20 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 10K | $0.57 | $6K | 52K |
| 2023-06-20 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 41K | price not stated in the filing | not stated | 61K |
| 2023-06-20 | PICKER DONALD H | Chief Science Officer | Exercise or conversion | 16K | price not stated in the filing | not stated | 94K |
| 2023-06-20 | PICKER DONALD H | Chief Science Officer | Tax withholding | 4K | $0.57 | $2K | 90K |
| 2023-06-16 | KLEMP WALTER V | CEO and President | Tax withholding | 6K | $0.57 | $3K | 429K |
| 2023-06-16 | KLEMP WALTER V | CEO and President | Exercise or conversion | 25K | price not stated in the filing | not stated | 435K |
| 2023-06-16 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 3K | $0.57 | $2K | 21K |
| 2023-06-16 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 13K | price not stated in the filing | not stated | 24K |
| 2022-11-25 | KLEMP WALTER V | CEO and President | Buy | 45K | $1.28 | $58K | 410K |
| 2022-11-21 | KLEMP WALTER V | CEO and President | Buy | 23K | $1.15 | $26K | 365K |
| 2022-11-17 | KLEMP WALTER V | CEO and President | Buy | 25K | $1.02 | $25K | 342K |
| 2022-11-16 | KLEMP WALTER V | CEO and President | Buy | 85K | $0.97 | $83K | 318K |
| 2022-07-11 | KLEMP WALTER V | CEO and President | Exercise or conversion | 13K | price not stated in the filing | not stated | 236K |
| 2022-07-11 | KLEMP WALTER V | CEO and President | Exercise or conversion | 13K | price not stated in the filing | not stated | 236K |
| 2022-07-11 | KLEMP WALTER V | CEO and President | Tax withholding | 3K | $1.68 | $5K | 232K |
| 2022-07-02 | KLEMP WALTER V | CEO and President | Exercise or conversion | 15K | price not stated in the filing | not stated | 226K |
| 2022-07-02 | KLEMP WALTER V | CEO and President | Exercise or conversion | 15K | price not stated in the filing | not stated | 226K |
| 2022-07-02 | KLEMP WALTER V | CEO and President | Tax withholding | 4K | $1.47 | $5K | 222K |
| 2022-06-16 | Foster Jonathan P. | Chief Financial Officer | Exercise or conversion | 13K | price not stated in the filing | not stated | 14K |
| 2022-06-16 | Foster Jonathan P. | Chief Financial Officer | Tax withholding | 3K | $1.33 | $4K | 11K |
| 2022-06-16 | KLEMP WALTER V | CEO and President | Exercise or conversion | 25K | price not stated in the filing | not stated | 217K |
| 2022-06-16 | KLEMP WALTER V | CEO and President | Tax withholding | 6K | $1.33 | $8K | 211K |
| 2021-07-11 | KLEMP WALTER V | CEO and President | Tax withholding | 3K | $3.56 | $11K | 192K |
| 2021-07-11 | KLEMP WALTER V | CEO and President | Exercise or conversion | 13K | price not stated in the filing | not stated | 196K |
| 2021-07-02 | KLEMP WALTER V | CEO and President | Tax withholding | 4K | $3.56 | $13K | 182K |
| 2021-07-02 | KLEMP WALTER V | CEO and President | Exercise or conversion | 15K | price not stated in the filing | not stated | 186K |
| 2020-07-13 | KLEMP WALTER V | CEO and President | Tax withholding | 19K | $0.86 | $17K | 1.0M |
| 2020-07-13 | KLEMP WALTER V | CEO and President | Exercise or conversion | 79K | price not stated in the filing | not stated | 1.0M |
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.
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON4 holders report 5% or more of MBRX in their latest filing, 2 on Schedule 13D (active intent). The largest reported stake is KLEMP WALTER V at 9.9% of the class (2,070,761 shares), filed 2026-08-25 for an event on 2026-08-19.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-25 | 13D | Foster Jonathan P.individual | 1.3M | 6.3% | 2026-08-19 |
| 2026-08-25 | 13D | KLEMP WALTER Vindividual | 2.1M | 9.9% | 2026-08-19 |
| 2026-08-25 | 13D | AnnaMed, Inc.corporation | 636 | 0.1% | 2026-08-19 |
| 2026-08-10 | 13G | Heights Capital Management, Inc.corporation | 1.9M | 9.9% | 2026-07-31 |
| 2026-08-10 | 13G | CVI Investments, Inc.corporation | 1.9M | 9.9% | 2026-07-31 |
| 2026-08-06 | 13G | Mitchell P. Kopinparent holding company, individual | 974K | 5.0% | 2026-07-31 |
| 2026-08-06 | 13G | Daniel B. Asherparent holding company, individual | 974K | 5.0% | 2026-07-31 |
| 2026-08-06 | 13G | Intracoastal Capital LLCother entity | 974K | 5.0% | 2026-07-31 |
What this page is
Moleculin Biotech 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 Moleculin Biotech (MBRX), SEC CIK 1659617, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. 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 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-13.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 2026-08-25.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 2026-08-14.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 2026-10-15.JSON and CSV
- Company record
- EDGAR filing index for CIK 1659617Ticker, 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 MBRX is sold short?
126,324 shares were held short at the 2026-10-15 settlement, 1.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is MBRX's daily short volume?
On 2026-11-02, 2,004 of the 5,744 MBRX shares reported to FINRA were sold short, 34.9% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MBRX have fails to deliver?
The SEC's latest file shows 1,130 MBRX shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.
Are MBRX insiders buying or selling?
No open-market insider trades were reported for MBRX in the last 90 days. The most recent filings are listed below. Latest filing: Foster Jonathan P. (Chief Financial Officer) on 2026-10-15.
Who owns 5% or more of MBRX?
4 holders report 5% or more of MBRX in their latest filing, 2 on Schedule 13D (active intent). The largest reported stake is KLEMP WALTER V at 9.9% of the class (2,070,761 shares), filed 2026-08-25 for an event on 2026-08-19.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.