iBio (IBIO)
iBio on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq.
4.2M
Short interest
settlement 2026-09-30
6.2
Days to cover
-3.8 days vs prior
65.8%
Short share of volume
2026-10-23
12,211
Fails to deliver
settlement 2026-08-28
Wed 11 Nov
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-23.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in IBIO is 4,202,419 shares, down 1,002,056 shares over the last month. Over the last 48 readings it ranged from 189,674 shares (31 December 2024) to 5,384,479 shares (15 July 2026). At the reported average volume of 682K shares a day that is 6.2 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/ibio" 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 | 4,202,419 | -14.9% | 681,565 | 6.17 |
| 2026-09-15 | 4,936,917 | -5.1% | 494,351 | 9.99 |
| 2026-08-31 | 5,204,475 | +3.5% | 895,038 | 5.81 |
| 2026-08-14 | 5,027,874 | -1.5% | 452,026 | 11.12 |
| 2026-07-31 | 5,105,713 | -5.2% | 732,757 | 6.97 |
| 2026-07-15 | 5,384,479 | +14.7% | 1,336,493 | 4.03 |
| 2026-06-30 | 4,694,085 | +25.0% | 924,957 | 5.07 |
| 2026-06-15 | 3,755,035 | -0.1% | 780,149 | 4.81 |
| 2026-05-29 | 3,760,082 | +10.3% | 781,885 | 4.81 |
| 2026-05-15 | 3,408,695 | -0.2% | 958,081 | 3.56 |
| 2026-04-30 | 3,416,605 | -6.2% | 1,043,818 | 3.27 |
| 2026-04-15 | 3,640,721 | -12.9% | 543,137 | 6.70 |
| 2026-03-31 | 4,179,062 | -0.3% | 1,221,377 | 3.42 |
| 2026-03-13 | 4,192,484 | +6.6% | 966,901 | 4.34 |
| 2026-02-27 | 3,933,560 | -6.0% | 1,058,209 | 3.72 |
| 2026-02-13 | 4,183,442 | +8.6% | 1,190,166 | 3.52 |
| 2026-01-30 | 3,853,117 | -1.1% | 1,034,389 | 3.73 |
| 2026-01-15 | 3,894,136 | +2.6% | 4,866,129 | 1.00 |
| 2025-12-31 | 3,795,021 | -2.8% | 1,510,429 | 2.51 |
| 2025-12-15 | 3,906,126 | +100.6% | 22,914,016 | 1.00 |
| 2025-11-28 | 1,947,486 | +65.9% | 1,006,427 | 1.94 |
| 2025-11-14 | 1,174,064 | -52.3% | 1,707,725 | 1.00 |
| 2025-10-31 | 2,460,602 | +496.7% | 13,073,499 | 1.00 |
| 2025-10-15 | 412,382 | -12.8% | 320,499 | 1.29 |
| 2025-09-30 | 472,896 | -47.7% | 344,112 | 1.37 |
| 2025-09-15 | 903,899 | -57.8% | 552,390 | 1.64 |
| 2025-08-29 | 2,142,846 | +89.6% | 3,553,279 | 1.00 |
| 2025-08-15 | 1,130,409 | +104.2% | 689,631 | 1.64 |
| 2025-07-31 | 553,594 | +18.2% | 427,791 | 1.29 |
| 2025-07-15 | 468,388 | -79.2% | 763,981 | 1.00 |
| 2025-06-30 | 2,250,783 | +171.8% | 10,147,293 | 1.00 |
| 2025-06-13 | 827,960 | +30.6% | 587,561 | 1.41 |
| 2025-05-30 | 633,804 | -3.5% | 338,172 | 1.87 |
| 2025-05-15 | 656,763 | -62.1% | 1,149,234 | 1.00 |
| 2025-04-30 | 1,732,094 | +87.2% | 3,298,285 | 1.00 |
| 2025-04-15 | 925,508 | -21.0% | 871,713 | 1.06 |
| 2025-03-31 | 1,172,123 | +37.8% | 451,712 | 2.59 |
| 2025-03-14 | 850,923 | -5.7% | 628,529 | 1.35 |
| 2025-02-28 | 902,498 | +98.7% | 1,198,561 | 1.00 |
| 2025-02-14 | 454,207 | +112.5% | 314,742 | 1.44 |
| 2025-01-31 | 213,769 | -11.7% | 328,390 | 1.00 |
| 2025-01-15 | 241,998 | +27.6% | 190,392 | 1.27 |
| 2024-12-31 | 189,674 | -25.8% | 75,064 | 2.53 |
| 2024-12-13 | 255,745 | +26.1% | 78,474 | 3.26 |
| 2024-11-29 | 202,764 | -12.2% | 126,516 | 1.60 |
| 2024-11-15 | 230,876 | -11.2% | 96,741 | 2.39 |
| 2024-10-31 | 260,096 | -15.5% | 112,624 | 2.31 |
| 2024-10-15 | 307,797 | +123.5% | 346,934 | 1.00 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of IBIO volume is 65.8%, down 9.0 points over the last five sessions. Over the last 30 readings it ranged from 12.8% (20 October 2026) to 74.8% (16 October 2026). The latest reading is 19.0 points above the 30-session average of 46.7%, on 278K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 183K | 278K | 65.8% | 11,745 |
| 2026-10-22 | 168K | 299K | 56.2% | 1,502 |
| 2026-10-21 | 178K | 299K | 59.4% | 0 |
| 2026-10-20 | 212K | 1.7M | 12.8% | 1,000 |
| 2026-10-19 | 133K | 214K | 61.9% | 0 |
| 2026-10-16 | 121K | 161K | 74.8% | 0 |
| 2026-10-15 | 121K | 195K | 62.1% | 1,000 |
| 2026-10-14 | 213K | 903K | 23.6% | 1,800 |
| 2026-10-13 | 147K | 787K | 18.7% | 5,399 |
| 2026-10-12 | 111K | 255K | 43.4% | 0 |
| 2026-10-09 | 272K | 964K | 28.2% | 69,684 |
| 2026-10-08 | 148K | 394K | 37.7% | 19,341 |
| 2026-10-07 | 287K | 2.1M | 13.8% | 1,545 |
| 2026-10-06 | 343K | 755K | 45.5% | 840 |
| 2026-10-05 | 197K | 692K | 28.5% | 0 |
| 2026-10-02 | 162K | 316K | 51.2% | 0 |
| 2026-10-01 | 125K | 171K | 73.4% | 100 |
| 2026-09-30 | 74K | 114K | 64.7% | 0 |
| 2026-09-29 | 76K | 140K | 54.6% | 0 |
| 2026-09-28 | 117K | 168K | 69.6% | 0 |
| 2026-09-25 | 120K | 329K | 36.5% | 0 |
| 2026-09-24 | 63K | 176K | 36.0% | 0 |
| 2026-09-23 | 95K | 172K | 55.5% | 0 |
| 2026-09-22 | 271K | 1.6M | 17.1% | 0 |
| 2026-09-21 | 135K | 198K | 68.0% | 9,676 |
| 2026-09-18 | 95K | 170K | 55.7% | 0 |
| 2026-09-17 | 281K | 1.5M | 18.2% | 300 |
| 2026-09-16 | 115K | 176K | 65.5% | 353 |
| 2026-09-15 | 100K | 198K | 50.6% | 0 |
| 2026-09-14 | 110K | 206K | 53.3% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 28 August 2026, the fails-to-deliver balance in IBIO is 12,211 shares, down 9,795 shares over the last settlement date. Over the last 30 readings it ranged from 52 shares (13 May 2026) to 220,979 shares (2 July 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-28 | 12,211 | $1.40 | $17K |
| 2026-08-27 | 22,006 | $1.43 | $31K |
| 2026-08-26 | 21,321 | $1.47 | $31K |
| 2026-08-25 | 887 | $1.42 | $1K |
| 2026-08-24 | 12,220 | $1.43 | $17K |
| 2026-08-21 | 1,086 | $1.47 | $2K |
| 2026-08-20 | 686 | $1.49 | $1K |
| 2026-08-14 | 65,178 | $1.40 | $91K |
| 2026-08-13 | 84,070 | $1.47 | $124K |
| 2026-08-12 | 1,300 | $1.47 | $2K |
| 2026-08-04 | 8,465 | $1.42 | $12K |
| 2026-07-23 | 5,671 | $1.38 | $8K |
| 2026-07-22 | 10,671 | $1.41 | $15K |
| 2026-07-16 | 10,700 | $1.43 | $15K |
| 2026-07-15 | 10,700 | $1.44 | $15K |
| 2026-07-14 | 10,700 | $1.45 | $16K |
| 2026-07-10 | 71,568 | $1.51 | $108K |
| 2026-07-09 | 135,857 | $1.52 | $207K |
| 2026-07-08 | 151,511 | $1.59 | $241K |
| 2026-07-07 | 199,694 | $1.62 | $324K |
| 2026-07-06 | 218,694 | $1.68 | $367K |
| 2026-07-02 | 220,979 | $1.75 | $387K |
| 2026-07-01 | 98,657 | $1.75 | $173K |
| 2026-06-30 | 80,229 | $1.73 | $139K |
| 2026-06-29 | 45,960 | $1.67 | $77K |
| 2026-06-26 | 2,247 | $1.59 | $4K |
| 2026-06-24 | 126 | $1.65 | $208 |
| 2026-06-09 | 300 | $1.73 | $519 |
| 2026-05-29 | 6,216 | $1.93 | $12K |
| 2026-05-13 | 52 | $1.61 | $84 |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for IBIO in the last 90 days. The most recent filings are listed below. Latest filing: Banjak Marc (Chief Legal Officer) on 2026-03-26.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-03-26 | Banjak Marc | Chief Legal Officer | Buy | 1K | $1.76 | $3K | 25K |
| 2026-03-26 | Banjak Marc | Chief Legal Officer | Buy | 13K | $1.64 | $21K | 24K |
| 2026-03-19 | Duran Felipe | Chief Financial Officer | Buy | 25K | $2.02 | $50K | 36K |
| 2026-03-19 | Brenner Martin | See Remarks | Buy | 12K | $2.02 | $25K | 31K |
| 2025-01-10 | Sender Gary | Director | Buy | 9K | $2.72 | $25K | 9K |
| 2025-01-10 | Parada Antonio Bernardino Guimaraes | Director | Buy | 184K | $2.72 | $500K | 184K |
| 2025-01-10 | Clark William D | Director | Buy | 2K | $2.72 | $5K | 2K |
| 2025-01-10 | Arkowitz David | Director | Buy | 18K | $2.72 | $50K | 18K |
| 2025-01-10 | Banjak Marc | Chief Legal Officer | Buy | 9K | $2.72 | $25K | 11K |
| 2025-01-10 | Brenner Martin | See Remarks | Buy | 9K | $2.72 | $25K | 18K |
| 2025-01-10 | Duran Felipe | Chief Financial Officer | Buy | 9K | $2.72 | $25K | 11K |
| 2023-11-01 | Brenner Martin | See Remarks | Sell | 5K | $0.27 | $1K | 183K |
| 2023-10-03 | Brenner Martin | See Remarks | Sell | 5K | $0.30 | $2K | 187K |
| 2023-10-02 | Brenner Martin | See Remarks | Sell | 4K | $0.31 | $1K | 193K |
| 2023-08-28 | Brenner Martin | See Remarks | Sell | 5K | $0.31 | $2K | 197K |
| 2023-07-27 | Brenner Martin | See Remarks | Sell | 4K | $0.51 | $2K | 202K |
| 2023-07-27 | Brenner Martin | See Remarks | Sell | 35 | $0.51 | $18 | 202K |
| 2023-07-12 | Brenner Martin | See Remarks | Sell | 47K | $0.59 | $28K | 206K |
| 2023-06-26 | Brenner Martin | See Remarks | Grant | 76K | $0.00 | $0 | 253K |
| 2023-06-22 | Brenner Martin | See Remarks | Returned to company | 76K | $0.00 | $0 | 178K |
| 2023-06-21 | Brenner Martin | See Remarks | Sell | 100 | $0.68 | $68 | 253K |
| 2023-06-21 | Brenner Martin | See Remarks | Sell | 225 | $0.69 | $155 | 254K |
| 2023-06-21 | Brenner Martin | See Remarks | Sell | 4K | $0.68 | $3K | 254K |
| 2023-05-22 | Brenner Martin | See Remarks | Sell | 24 | $0.95 | $23 | 258K |
| 2023-05-22 | Brenner Martin | See Remarks | Sell | 4K | $0.94 | $4K | 258K |
| 2023-04-24 | Brenner Martin | See Remarks | Sell | 4K | $1.20 | $5K | 262K |
| 2023-03-31 | Duran Felipe | Chief Financial Officer | Grant | 38K | $0.00 | $0 | 40K |
| 2023-03-31 | Brenner Martin | See Remarks | Grant | 50K | $0.00 | $0 | 266K |
| 2023-03-23 | Brenner Martin | See Remarks | Sell | 5K | $2.13 | $11K | 216K |
| 2023-02-21 | Brenner Martin | See Remarks | Sell | 4K | $1.77 | $7K | 221K |
| 2023-01-20 | Brenner Martin | Interim CEO and CSO | Grant | 130K | $0.00 | $0 | 225K |
| 2022-11-11 | Lutz Robert Matthew | See Remarks | Grant | 100K | $0.00 | $0 | 102K |
| 2022-11-11 | Brenner Martin | Chief Scientific Officer | Grant | 95K | $0.00 | $0 | 95K |
| 2022-03-10 | Lutz Robert Matthew | See Remarks | Sell | 25K | $0.35 | $9K | 207K |
| 2021-12-07 | Maddux Randy Joe | Chief Operating Officer | Sell | 37K | $0.68 | $25K | 272K |
| 2021-03-04 | Lutz Robert Matthew | See Remarks | Grant | 232K | $0.00 | $0 | 232K |
| 2020-12-01 | Maddux Randy Joe | Chief Operating Officer | Grant | 309K | $0.00 | $0 | 309K |
| 2020-08-11 | Portfolio Services Ltd. | TenPercentOwner | Sell | 15.9M | $2.92 | $46.3M | 8.6M |
| 2020-08-10 | Portfolio Services Ltd. | TenPercentOwner | Sell | 7.3M | $3.91 | $28.4M | 24.5M |
| 2020-08-07 | Portfolio Services Ltd. | TenPercentOwner | Sell | 1.4M | $3.83 | $5.2M | 31.8M |
| 2020-08-07 | Portfolio Services Ltd. | TenPercentOwner | Conversion | 28.9M | $0.20 | $5.8M | 33.1M |
| 2020-08-06 | Eastern Capital LTD | TenPercentOwner | Sell | 2.8M | $4.18 | $11.6M | 33.1M |
| 2020-08-05 | Eastern Capital LTD | TenPercentOwner | Sell | 900K | $4.46 | $4.0M | 35.9M |
| 2020-08-04 | Eastern Capital LTD | TenPercentOwner | Sell | 600K | $4.39 | $2.6M | 36.8M |
| 2020-06-04 | ERWIN ROBERT L | President | Sell | 28K | $1.71 | $48K | 108K |
| 2020-06-04 | ERWIN ROBERT L | President | Exercise or conversion | 28K | $0.93 | $26K | 108K |
| 2020-06-02 | ERWIN ROBERT L | President | Exercise or conversion | 96K | $0.93 | $89K | 136K |
| 2020-06-02 | ERWIN ROBERT L | President | Sell | 96K | $1.62 | $156K | 136K |
| 2020-05-27 | Mullaney James P. | Chief Financial Officer | Sell | 11K | $1.61 | $18K | 0 |
| 2020-05-27 | Mullaney James P. | Chief Financial Officer | Exercise or conversion | 11K | $0.93 | $10K | 0 |
| 2020-03-19 | Isett Thomas Francis 3rd | CEO and Executive Co-Chairman | Conversion | 100K | $0.20 | $20K | 1.3M |
| 2020-03-17 | Isett Thomas Francis 3rd | CEO and Executive Co-Chairman | Exercise (in or at the money) | 78K | $0.22 | $17K | 1.3M |
| 2020-02-20 | Isett Thomas Francis 3rd | CEO and Executive Chairman | Other transaction | 122K | price not stated in the filing | not stated | 1.3M |
| 2019-03-14 | DART KENNETH BRYAN | TenPercentOwner | Other transaction | 1 | price not stated in the filing | not stated | 1 |
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, 50 of 53 shown. JSON29 holders report 5% or more of IBIO in their latest filing, all on Schedule 13G (passive). The largest reported stake is Bihua Chen at 10.0% of the class (5,117,481 shares), filed 2026-08-14 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-10-14 | 13G | Coastlands Capital LPinvestment adviser, partnership | 6.2M | 9.7% | 2026-10-07 |
| 2026-10-14 | 13G | Coastlands Capital GP LLCother entity | 6.2M | 9.7% | 2026-10-07 |
| 2026-10-14 | 13G | Coastlands Capital LLCparent holding company, other entity | 6.2M | 9.7% | 2026-10-07 |
| 2026-10-14 | 13G | Matthew D. Perryparent holding company, individual | 6.2M | 9.7% | 2026-10-07 |
| 2026-10-14 | 13G | Coastlands Capital Partners LPpartnership | 6.2M | 9.7% | 2026-10-07 |
| 2026-08-14 | 13G/Ano. 2 | Bihua Chenparent holding company, individual | 5.1M | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 2 | Cormorant Asset Management, LPinvestment adviser, partnership | 5.1M | 10.0% | 2026-06-30 |
| 2026-08-14 | 13G | Weston Nicholsindividual | 2.8M | 5.4% | 2026-06-30 |
| 2026-08-14 | 13G | Lynx1 Capital Management LPpartnership | 2.8M | 5.4% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 1 | Vestal Point Capital, LPinvestment adviser, partnership | 4.0M | 7.9% | 2026-06-30 |
| 2026-08-14 | 13G/Ano. 1 | Ryan Wilderparent holding company, individual | 4.0M | 7.9% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 4 | Affinity Asset Advisors, LLCinvestment adviser, other entity | 5.1M | 10.0% | 2026-06-30 |
| 2026-08-13 | 13G/Ano. 4 | Michael Choindividual, parent holding company | 5.1M | 10.0% | 2026-06-30 |
| 2026-05-15 | 13G/Ano. 2 | Logos Global Master Fund LPpartnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 2 | Arsani Williamparent holding company, individual | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 2 | Logos GP LLCparent holding company, other entity | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 2 | Logos Global Management GP LLCparent holding company, other entity | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 2 | Logos Global Management LPinvestment adviser, partnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | EcoR1 Capital, LLCinvestment adviser, other entity | 1.6M | 4.6% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Oleg Nodelmanparent holding company, individual | 1.6M | 4.6% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | EcoR1 Capital Fund Qualified, L.P.partnership | 1.5M | 4.3% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Steven A. Cohenindividual | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Point72 Capital Advisors, Inc.corporation | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G/Ano. 1 | Point72 Asset Management, L.P.partnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-15 | 13G | Sirenia Capital Management LPinvestment adviser, partnership | 11.6M | 9.9% | 2026-03-31 |
| 2026-05-15 | 13G | Alex Silversteinparent holding company, individual | 11.6M | 9.9% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLSP, L.P.partnership | 2.0M | 5.7% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLSP, L.L.C.other entity | 2.0M | 5.7% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | Frazier Life Sciences Public Fund, L.P.partnership | 2.0M | 5.7% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLS XI, L.L.C.other entity | 0 | 0.0% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLS XI, L.P.partnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | Frazier Life Sciences XI, L.P.partnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLS XII, L.L.C.other entity | 0 | 0.0% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | FHMLS XII, L.P.partnership | 0 | 0.0% | 2026-03-31 |
| 2026-05-12 | 13G/Ano. 1 | Frazier Life Sciences XII, L.P.partnership | 0 | 0.0% | 2026-03-31 |
| 2026-02-17 | 13G/Ano. 4 | Daniel Schneebergerparent holding company, individual | 1.4M | 4.4% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 4 | ADAR1 Capital Management, LLCinvestment adviser, other entity | 1.4M | 4.4% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 4 | ADAR1 Capital Management GP, LLCother entity | 1.3M | 4.3% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 4 | ADAR1 Partners, LPpartnership | 1.3M | 4.3% | 2025-12-31 |
| 2026-02-17 | 13G/Ano. 1 | William Arsaniparent holding company, individual | 1.5M | 4.6% | 2025-12-31 |
| 2026-01-22 | 13G | Israel A. Englanderindividual | 1.2M | 5.2% | 2026-01-15 |
| 2026-01-22 | 13G | Millennium Group Management LLCother entity | 1.2M | 5.2% | 2026-01-15 |
| 2026-01-22 | 13G | Millennium Management LLCother entity | 1.2M | 5.2% | 2026-01-15 |
| 2026-01-22 | 13G | Integrated Core Strategies (US) LLCother entity | 1.2M | 5.2% | 2026-01-15 |
| 2025-12-03 | 13G/Ano. 1 | Affinity Healthcare Fund, LPpartnership | 2.2M | 10.0% | 2025-08-19 |
| 2025-11-14 | 13G/Ano. 1 | Ikarian Capital, LLCinvestment adviser | 1.2M | 5.0% | 2025-09-30 |
| 2025-11-14 | 13G/Ano. 1 | Neil Shahrestaniindividual, parent holding company | 1.2M | 5.0% | 2025-09-30 |
| 2025-11-14 | 13G | Devesh Gandhiindividual | 2.2M | 10.0% | 2025-09-30 |
| 2025-11-14 | 13G | SilverArc Capital Management, LLCinvestment adviser | 2.2M | 10.0% | 2025-09-30 |
| 2025-11-14 | 13G | SilverArc Capital Alpha Fund II, L.P.partnership | 1.6M | 7.2% | 2025-09-30 |
13F holders
Tracked managers holding IBIO at their latest 13F. JSON4 of the 30 tracked managers held IBIO at their latest 13F, $6.4M in total at quarter-end prices. Millennium Management is the largest at $2.9M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 1 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 1.7M | $2.9M | 0.00% | +102K |
| Citadel Advisors | 2026-06-30 | 1.4M | $2.4M | 0.00% | +428K |
| Two Sigma Investments | 2026-06-30 | 401K | $701K | 0.00% | -8K |
| Renaissance Technologies | 2026-06-30 | 203K | $355K | 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.
What this page is
iBio 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 iBio (IBIO), SEC CIK 1420720, 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 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-23.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-28.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 2026-10-14.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 2026-08-28.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 2026-03-26.JSON and CSV
- Company record
- EDGAR filing index for CIK 1420720Ticker, 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 IBIO is sold short?
4,202,419 shares were held short at the 2026-09-30 settlement, 6.2 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 IBIO's daily short volume?
On 2026-10-23, 182,904 of the 278,157 IBIO shares reported to FINRA were sold short, 65.8% of the day's reported volume. Short volume is a flow for one day, not a position.
Does IBIO have fails to deliver?
The SEC's latest file shows 12,211 IBIO shares failed to deliver at settlement 2026-08-28. Fails are reported per settlement date and published twice a month with a lag.
Are IBIO insiders buying or selling?
No open-market insider trades were reported for IBIO in the last 90 days. The most recent filings are listed below. Latest filing: Banjak Marc (Chief Legal Officer) on 2026-03-26.
Who owns 5% or more of IBIO?
29 holders report 5% or more of IBIO in their latest filing, all on Schedule 13G (passive). The largest reported stake is Bihua Chen at 10.0% of the class (5,117,481 shares), filed 2026-08-14 for an event on 2026-06-30.
Which tracked 13F managers own IBIO?
4 of the 30 tracked 13F managers held IBIO shares at their latest filing, $6.4M in all. The largest: Izzy Englander's Millennium Management (1.7M shares, $2.9M), Ken Griffin's Citadel Advisors (1.4M shares, $2.4M), Two Sigma Investments (401K shares, $701K), Renaissance Technologies (203K shares, $355K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.