FibroBiologics, Inc. (FBLG)
Every FINRA and SEC series the site collects for FibroBiologics, Inc.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq.
414K
Short interest
settlement 2026-08-31
1.4
Days to cover
+192.0% vs prior
24.4%
Short share of volume
2026-09-17
427
Fails to deliver
settlement 2026-08-31
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-09-17.
Short interest
FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSONAs of 31 August 2026, short interest in FBLG is 413,742 shares, up 298,542 shares over the last month. Over the last 48 readings it ranged from 70,837 shares (15 July 2026) to 2,699,732 shares (29 November 2024). At the reported average volume of 295K shares a day that is 1.4 days to cover.
Embed this chartkeeps the attribution line it carries
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-08-31 | 413,742 | +192.0% | 294,961 | 1.40 |
| 2026-08-14 | 141,714 | +23.0% | 248,372 | 1.00 |
| 2026-07-31 | 115,200 | +62.6% | 90,907 | 1.27 |
| 2026-07-15 | 70,837 | -47.8% | 59,556 | 1.19 |
| 2026-06-30 | 135,794 | -0.9% | 260,529 | 1.00 |
| 2026-06-15 | 137,027 | +1.1% | 148,389 | 1.00 |
| 2026-05-29 | 135,591 | -42.9% | 99,753 | 1.36 |
| 2026-05-15 | 237,640 | +100.7% | 563,635 | 1.00 |
| 2026-04-30 | 118,414 | +18.4% | 184,802 | 1.00 |
| 2026-04-15 | 99,974 | -52.3% | 744,366 | 1.00 |
| 2026-03-31 | 209,586 | -76.0% | 828,169 | 1.00 |
| 2026-03-13 | 873,527 | +30.1% | 1,498,900 | 1.00 |
| 2026-02-27 | 671,279 | +6.5% | 585,321 | 1.15 |
| 2026-02-13 | 630,020 | -26.0% | 1,232,115 | 1.00 |
| 2026-01-30 | 851,743 | +128.4% | 689,374 | 1.24 |
| 2026-01-15 | 372,855 | -58.9% | 2,493,848 | 1.00 |
| 2025-12-31 | 907,076 | +14.1% | 3,536,564 | 1.00 |
| 2025-12-15 | 795,335 | -42.8% | 1,960,972 | 1.00 |
| 2025-11-28 | 1,389,641 | -1.5% | 1,833,492 | 1.00 |
| 2025-11-14 | 1,410,801 | -22.1% | 1,036,001 | 1.36 |
| 2025-10-31 | 1,811,524 | -10.8% | 983,685 | 1.84 |
| 2025-10-15 | 2,029,942 | +110.2% | 1,234,616 | 1.64 |
| 2025-09-30 | 965,853 | -0.5% | 881,562 | 1.10 |
| 2025-09-15 | 970,560 | +5.8% | 456,006 | 2.13 |
Daily short volume
FINRA Reg SHO, last 60 sessions. JSONAs of 17 September 2026, the short share of FBLG volume is 24.4%, down 39.5 points over the last five sessions. Over the last 52 readings it ranged from 6.0% (21 July 2026) to 78.5% (31 August 2026). The latest reading is 32.0 points below the 30-session average of 56.4%, on 39K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-09-17 | 10K | 39K | 24.4% | 0 |
| 2026-09-16 | 15K | 48K | 31.5% | 200 |
| 2026-09-15 | 31K | 114K | 27.4% | 0 |
| 2026-09-14 | 61K | 141K | 43.0% | 31 |
| 2026-09-11 | 25K | 61K | 40.9% | 0 |
| 2026-09-10 | 36K | 57K | 63.9% | 0 |
| 2026-09-09 | 59K | 94K | 63.6% | 21,937 |
| 2026-09-08 | 54K | 106K | 50.4% | 22,568 |
| 2026-09-04 | 66K | 99K | 66.0% | 5,041 |
| 2026-09-03 | 84K | 225K | 37.5% | 45,567 |
| 2026-09-02 | 188K | 317K | 59.4% | 8,395 |
| 2026-09-01 | 540K | 786K | 68.6% | 1,182 |
| 2026-08-31 | 196K | 250K | 78.5% | 1,000 |
| 2026-08-28 | 52K | 69K | 75.1% | 0 |
| 2026-08-27 | 50K | 79K | 62.6% | 0 |
| 2026-08-26 | 39K | 60K | 64.5% | 0 |
| 2026-08-25 | 53K | 85K | 62.4% | 0 |
| 2026-08-24 | 94K | 153K | 61.6% | 0 |
| 2026-08-21 | 255K | 346K | 73.7% | 100 |
| 2026-08-20 | 115K | 188K | 61.1% | 0 |
| 2026-08-19 | 118K | 182K | 64.5% | 20 |
| 2026-08-18 | 132K | 187K | 70.8% | 0 |
| 2026-08-17 | 43K | 67K | 64.9% | 6,471 |
| 2026-08-14 | 52K | 108K | 48.4% | 2,551 |
| 2026-08-13 | 130K | 219K | 59.7% | 25 |
| 2026-08-12 | 73K | 137K | 53.6% | 1,389 |
| 2026-08-11 | 39K | 64K | 60.6% | 1,148 |
| 2026-08-10 | 35K | 87K | 40.6% | 0 |
| 2026-08-07 | 51K | 99K | 51.6% | 5,475 |
| 2026-08-06 | 251K | 419K | 59.9% | 208 |
Fails to deliver
SEC, by settlement date. JSONAs of 31 August 2026, the fails-to-deliver balance in FBLG is 427 shares, up 27 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (10 April 2026) to 34,562 shares (29 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-31 | 427 | $1.44 | $615 |
| 2026-08-26 | 400 | $1.40 | $560 |
| 2026-08-24 | 19,845 | $1.44 | $29K |
| 2026-08-20 | 383 | $1.19 | $456 |
| 2026-08-19 | 22,249 | $1.14 | $25K |
| 2026-08-17 | 3,822 | $1.07 | $4K |
| 2026-08-14 | 2 | $1.15 | $2 |
| 2026-08-13 | 2 | $1.11 | $2 |
| 2026-08-06 | 2,012 | $0.87 | $2K |
| 2026-08-05 | 342 | $0.82 | $280 |
| 2026-08-04 | 4,324 | $0.79 | $3K |
| 2026-08-03 | 1,549 | $0.70 | $1K |
| 2026-07-31 | 338 | $0.72 | $243 |
| 2026-07-30 | 396 | $0.65 | $257 |
| 2026-07-29 | 364 | $0.64 | $233 |
| 2026-07-24 | 942 | $0.74 | $697 |
| 2026-07-23 | 2,114 | $0.74 | $2K |
| 2026-07-22 | 2,651 | $0.77 | $2K |
| 2026-07-20 | 3,178 | $0.83 | $3K |
| 2026-07-17 | 1,924 | $0.84 | $2K |
| 2026-07-14 | 5,137 | $0.86 | $4K |
| 2026-07-13 | 3,489 | $0.92 | $3K |
| 2026-07-08 | 14 | $0.84 | $12 |
| 2026-07-07 | 607 | $0.87 | $528 |
| 2026-07-02 | 772 | $0.91 | $703 |
| 2026-07-01 | 1,688 | $0.95 | $2K |
| 2026-06-30 | 360 | $0.79 | $284 |
| 2026-06-29 | 34,562 | $0.83 | $29K |
| 2026-06-24 | 290 | $0.75 | $218 |
| 2026-06-17 | 8,854 | $0.81 | $7K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for FBLG in the last 90 days. The most recent filings are listed below; grants and option exercises carry a weaker signal than voluntary trades. Latest filing: Khoja Hamid (Chief Scientific Officer) on 2026-09-15.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | Khoja Hamid | Chief Scientific Officer | Grant | 299K | $1.68 | $500K | 302K |
| 2026-03-04 | O'HEERON PETE | CHIEF EXECUTIVE OFFICER | Buy | 16K | $0.38 | $6K | 6.0M |
| 2026-03-04 | Khoja Hamid | Chief Scientific Officer | Buy | 30K | $0.38 | $11K | 61K |
| 2026-03-03 | O'HEERON PETE | CHIEF EXECUTIVE OFFICER | Buy | 18K | $0.41 | $7K | 5.9M |
| 2026-03-02 | Davis Jason | Chief Financial Officer | Buy | 70K | $0.41 | $29K | 70K |
| 2026-03-02 | O'HEERON PETE | CHIEF EXECUTIVE OFFICER | Buy | 17K | $0.35 | $6K | 5.9M |
| 2026-02-27 | GARCIA RUBEN A | General Counsel | Buy | 40K | $0.33 | $13K | 180K |
| 2025-12-11 | GARCIA RUBEN A | General Counsel | Buy | 140K | $0.34 | $48K | 140K |
| 2025-05-27 | Khoja Hamid | Chief Scientific Officer | Buy | 20K | $0.84 | $17K | 31K |
| 2024-12-09 | O'HEERON PETE | Chief Executive Officer | Gift | 100K | $0.00 | $0 | 5.9M |
| 2024-12-03 | O'HEERON PETE | Chief Executive Officer | Gift | 50K | $0.00 | $0 | 6.0M |
| 2024-08-12 | Khoja Hamid | Chief Scientific Officer | Buy | 10K | $1.90 | $19K | 11K |
| 2024-08-12 | O'HEERON PETE | Chief Executive Officer | Buy | 9K | $1.91 | $16K | 6.1M |
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 the rarer, stronger signal.
Large holders (13D and 13G)
One row per reporting person, newest filing first. JSON6 holders above 5% have filed on FBLG, 1 on Schedule 13D (active intent). The largest reported stake is Armistice Capital, LLC at 10.0% of the class (738,977 shares), filed 2026-08-14 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-09-17 | 13D | Hamid Khojaindividual | 630K | 7.5% | 2026-09-15 |
| 2026-08-14 | 13G | Armistice Capital, LLCinvestment adviser, other entity | 739K | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G | Steven Boydparent holding company, individual | 739K | 10.0% | 2026-06-30 |
| 2026-04-09 | 13G | Lind Global Fund III LPpartnership | 230K | 5.0% | 2026-04-02 |
| 2026-04-09 | 13G | Lind Global Partners III LLCcorporation | 230K | 5.0% | 2026-04-02 |
| 2026-04-09 | 13G | EASTON JEFFindividual | 230K | 5.0% | 2026-04-02 |
What this page is
FibroBiologics, Inc. 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 pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, 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 summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.
This page follows FibroBiologics, Inc. (FBLG), SEC CIK 1958777, listed on Nasdaq. The cross-market tables live on the short interest and insider transactions hubs.
Source and method
- Short interest
- FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-31.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-17.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-31.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GEDGAR read every 30 minutes; 13D within five business days of crossing 5%, 13G on the passive schedule. Latest 2026-09-17.JSON and CSV
- Insider trades
- SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-15.JSON and CSV
- Company record
- EDGAR filing index for CIK 1958777Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 30 requests a minute without a key, 120 a minute with a key from a free account.
Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 18 Sep 05:40 UTC.
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 crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short 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 FBLG is sold short?
What is FBLG's daily short volume?
Does FBLG have fails to deliver?
Are FBLG insiders buying or selling?
Who owns more than 5% of FBLG?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.