GOSSAMER BIO INC (GOSS)
Institutional ownership reported to the SEC as of Q2 2026, across 30 quarters.
175
Reporting holders
$64.5M
Reported value
79.8%
Of shares outstanding
0.7%
Calls
0.1%
Puts
-17
Holder change
Institutions report 390,087,898 shares against 488,846,722 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| D. E. Shaw & Co., Inc. | $6.7M | 40,959,285 | 0.00% | 5q | +10417.7%+$6.7M |
| 683 Capital Management, LLC | $6.5M | 39,198,868 | 0.32% | 12q | +684.0%+$5.6M |
| DeepCurrents Investment Group LLC | $6.0M | 37,665,073 | 0.18% | new | NEW |
| Context Capital Management, LLC | $4.8M | 28,946,459 | 0.09% | new | NEW |
| Worth Venture Partners, LLC | $4.1M | 25,017,881 | 9.29% | new | NEW |
| Kalehua Capital Management LLC | $3.7M | 22,298,726 | 1.17% | 2q | +25.9%+$755.6K |
| AQR CAPITAL MANAGEMENT LLC | $2.6M | 15,629,993 | 0.00% | 4q | +54.3%+$905.8K |
| GSA CAPITAL PARTNERS LLP | $2.5M | 14,986,947 | 0.16% | 8q | +360.5%+$1.9M |
| WOLVERINE ASSET MANAGEMENT LLC | $2.1M | 12,894,746 | 0.02% | 2q | HELD |
| RENAISSANCE TECHNOLOGIES LLC | $1.9M | 11,629,896 | 0.00% | 11q | +854.9%+$1.7M |
| Corient Private Wealth LP | $1.9M | 11,251,018 | 0.00% | 15q | +182.3%+$1.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | $1.6M | 9,416,023 | 0.00% | 2q | HELD |
| ARCH Venture Management, LLC | $1.3M | 8,055,916 | 0.12% | 12q | HELD |
| BARCLAYS PLC | $1.3M | 7,832,522 | 0.00% | 17q | +155.5%+$784.6K |
| Octagon Capital Advisors LP | $1.3M | 7,750,000 | 0.11% | 23q | HELD |
| BlackRock, Inc. | $1.3M | 7,669,943 | 0.00% | 8q | -54.4%-$1.5M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $1.2M | 7,573,388 | 0.00% | new | NEW |
| TWO SIGMA INVESTMENTS, LP | $1.2M | 7,432,001 | 0.00% | 26q | +55.5%+$436.4K |
| SAMSARA BIOCAPITAL, LLC | $1.2M | 7,222,559 | 0.10% | 12q | HELD |
| Qube Research & Technologies Ltd | $1.2M | 7,065,756 | 0.00% | 11q | +43.7%+$353.6K |
| Siren, L.L.C. | $857.4K | 5,208,968 | 0.02% | 8q | HELD |
| HHLR ADVISORS, LTD. | $818.7K | 4,974,041 | 0.10% | 30q | HELD |
| UBS Group AG | $510.5K | 3,093,785 | 0.00% | 24q | +64.2%+$199.7K |
| Squarepoint Ops LLC | $420.8K | 2,556,378 | 0.00% | 3q | -24.8%-$138.7K |
| GEODE CAPITAL MANAGEMENT, LLC | $408.7K | 2,481,605 | 0.00% | 30q | -49.8%-$404.8K |
| MILLENNIUM MANAGEMENT LLC | $395.5K | 2,402,633 | 0.00% | 27q | +1182.0%+$364.6K |
| STATE STREET CORP | $367.0K | 2,229,436 | 0.00% | 30q | -49.2%-$355.3K |
| MB Generational Wealth, LLC | $365.0K | 2,217,451 | 0.18% | 4q | +44.7%+$112.8K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $360.0K | 2,187,402 | 0.00% | 11q | +29.0%+$81.0K |
| MARSHALL WACE, LLP | $338.4K | 2,114,988 | 0.00% | new | NEW |
| Alyeska Investment Group, L.P. | $337.7K | 2,051,442 | 0.00% | 9q | HELD |
| ACADIAN ASSET MANAGEMENT LLC | $293.0K | 1,792,135 | 0.00% | 15q | -66.0%-$569.9K |
| HSBC HOLDINGS PLC | $267.4K | 1,583,118 | 0.00% | 2q | +1289.4%+$248.1K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $256.3K | 383,049 | 0.00% | 28q | +182.1%+$165.5K |
| Ensign Peak Advisors, Inc | $238.8K | 1,450,979 | 0.00% | 2q | -57.4%-$321.5K |
| VANGUARD FIDUCIARY TRUST CO | $205.5K | 1,245,392 | 0.00% | 2q | -11.3%-$26.2K |
| JPMORGAN CHASE & CO | $201.5K | 1,228,634 | 0.00% | 10q | +1225.5%+$186.3K |
| DEUTSCHE BANK AG\ | $188.1K | 1,106,441 | 0.00% | 11q | -15.3%-$33.9K |
| GOLDMAN SACHS GROUP INC | $185.7K | 1,128,451 | 0.00% | 27q | -4.4%-$8.6K |
| Hennion & Walsh Asset Management, Inc. | $180.9K | 1,098,914 | 0.01% | 3q | +32.6%+$44.5K |
| NEA Management Company, LLC | $164.6K | 1,000,000 | 0.01% | 16q | HELD |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $163.4K | 992,527 | 0.00% | 30q | -34.3%-$85.2K |
| Sixth Street Partners Management Company, L.P. | $163.4K | 992,527 | 0.00% | new | NEW |
| SIMPLEX TRADING, LLC | $154.3K | options only | 0.00% | 23q | OPTIONS |
| SMITH, MOORE & CO. | $148.1K | 900,000 | 0.01% | 16q | +91.5%+$70.8K |
| Ishara Investments LP | $135.0K | 820,000 | 0.10% | 2q | HELD |
| PANAGORA ASSET MANAGEMENT INC | $120.7K | 733,216 | 0.00% | 4q | +56.0%+$43.3K |
| MERCER GLOBAL ADVISORS INC /ADV | $98.1K | 595,726 | 0.00% | 4q | +214.7%+$66.9K |
| Mariner, LLC | $97.9K | 594,719 | 0.00% | 4q | +42.1%+$29.0K |
| IEQ CAPITAL, LLC | $97.3K | 591,254 | 0.00% | 3q | +50.2%+$32.5K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $89.8K | 544,212 | 0.00% | 2q | -74.8%-$266.8K |
| CHOREO, LLC | $88.9K | 540,111 | 0.00% | 9q | +115.9%+$47.7K |
| TUDOR INVESTMENT CORP ET AL | $78.9K | 479,581 | 0.00% | 14q | +316.2%+$60.0K |
| Virtu Financial LLC | $76.0K | 463,708 | 0.00% | 2q | +76.2%+$32.9K |
| CITADEL ADVISORS LLC | $75.9K | options only | 0.00% | 30q | OPTIONS |
| NORTHERN TRUST CORP | $75.5K | 458,498 | 0.00% | 30q | -67.5%-$156.4K |
| Invesco Ltd. | $72.8K | 442,268 | 0.00% | 6q | -4.9%-$3.7K |
| BANK OF AMERICA CORP /DE/ | $65.1K | 396,727 | 0.00% | 30q | -87.5%-$455.4K |
| Merit Financial Group, LLC | $55.8K | 339,192 | 0.00% | 4q | +119.6%+$30.4K |
| LPL Financial LLC | $54.7K | 332,534 | 0.00% | 5q | -10.5%-$6.5K |
| GROUP ONE TRADING LLC | $45.8K | 110,927 | 0.00% | 28q | +32.7%+$11.3K |
| WADDELL & ASSOCIATES, LLC | $43.1K | 261,798 | 0.00% | 2q | +287.6%+$32.0K |
| MORGAN STANLEY | $39.8K | 241,591 | 0.00% | 30q | -34.2%-$20.7K |
| PRUDENTIAL FINANCIAL INC | $37.5K | 227,550 | 0.00% | 8q | +306.9%+$28.2K |
| ADAR1 Capital Management, LLC | $35.0K | 212,531 | 0.00% | 11q | -26.1%-$12.3K |
| Creative Planning | $34.9K | 211,955 | 0.00% | 4q | +68.7%+$14.2K |
| EVENTIDE ASSET MANAGEMENT, LLC | $26.8K | 163,440 | 0.00% | new | NEW |
| Cerity Partners LLC | $26.4K | 160,399 | 0.00% | 6q | +50.6%+$8.9K |
| Sivia Capital Partners, LLC | $25.1K | 152,298 | 0.00% | 10q | +66.1%+$10.0K |
| SG Americas Securities, LLC | $24.0K | 146,737 | 0.00% | 4q | +14.1%+$3.0K |
| Tower Research Capital LLC (TRC) | $23.8K | 144,473 | 0.00% | 6q | +297.5%+$17.8K |
| HighTower Advisors, LLC | $23.8K | 144,358 | 0.00% | 4q | +120.0%+$13.0K |
| JANE STREET GROUP, LLC | $22.2K | options only | 0.00% | 7q | OPTIONS |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $22.0K | 153,902 | 0.00% | 4q | +48.8%+$7.2K |
| Schonfeld Strategic Advisors LLC | $21.9K | 132,888 | 0.00% | new | NEW |
| FMR LLC | $21.5K | 130,325 | 0.00% | 20q | +478.8%+$17.7K |
| Russell Investments Group, Ltd. | $19.9K | 121,039 | 0.00% | 4q | -16.7%-$4.0K |
| OSAIC HOLDINGS, INC. | $19.2K | 120,204 | 0.00% | 26q | +8843.8%+$19.0K |
| Integrated Wealth Concepts LLC | $18.3K | 111,054 | 0.00% | 2q | +669.9%+$15.9K |
| Arax Advisory Partners | $17.8K | 108,204 | 0.00% | new | NEW |
| BCV Asset Management Inc. | $17.5K | 106,500 | 0.00% | 2q | HELD |
| Rockefeller Capital Management L.P. | $17.4K | 105,866 | 0.00% | 4q | -1.6% |
| Balyasny Asset Management L.P. | $17.2K | 104,232 | 0.00% | 4q | -98.2%-$957.7K |
| COMMONWEALTH EQUITY SERVICES, LLC | $16.8K | 101,993 | 0.00% | 11q | -7.3%-$1.3K |
| Quarry LP | $16.5K | 100,000 | 0.00% | 2q | HELD |
| Focus Partners Wealth | $15.3K | 92,848 | 0.00% | 2q | +27.2%+$3.3K |
| RHUMBLINE ADVISERS | $14.6K | 88,599 | 0.00% | 5q | -59.1%-$21.1K |
| Cambridge Investment Research Advisors, Inc. | $14.0K | 85,600 | 0.00% | 10q | +100.0%+$7.0K |
| CAPTRUST FINANCIAL ADVISORS | $13.5K | 81,778 | 0.00% | 2q | +42.2%+$4.0K |
| Vanguard Global Advisers, LLC | $13.1K | 79,682 | 0.00% | 2q | HELD |
| BNP PARIBAS FINANCIAL MARKETS | $12.1K | 73,693 | 0.00% | 29q | -22.9%-$3.6K |
| Caprock Group, LLC | $11.5K | 70,000 | 0.00% | 3q | HELD |
| Velan Capital Investment Management LP | $11.5K | 70,000 | 0.01% | 7q | HELD |
| AlphaCore Capital LLC | $11.4K | 69,482 | 0.00% | 3q | +31.1%+$2.7K |
| Bronte Capital Management Pty Ltd. | $11.2K | 67,754 | 0.00% | new | NEW |
| TWO SIGMA SECURITIES, LLC | $9.6K | 58,064 | 0.00% | new | NEW |
| Bull Harbor Capital LLC | $8.4K | 51,235 | 0.00% | 2q | +64.2%+$3.3K |
| Beacon Pointe Advisors, LLC | $7.9K | 48,000 | 0.00% | 3q | +71.4%+$3.3K |
| Bank of New York Mellon Corp | $7.5K | 45,713 | 0.00% | 30q | -89.3%-$63.0K |
| Y-Intercept (Hong Kong) Ltd | $7.1K | 43,210 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-24 | 13D/A | D. E. Shaw & Co., L.L.C.with 3 co-filers | 6.0% |
| 2026-07-29 | 13G | Opaleye Management Inc.with 2 co-filers | 5.1% |
| 2026-07-29 | 13G/A | BlackRock, Inc. | 1.0% |
| 2026-07-24 | 13D/A | D. E. Shaw & Co., L.P.with 3 co-filers | 7.1% |
| 2026-07-01 | 13D/A | D. E. Shaw & Co., L.P.with 3 co-filers | 8.3% |
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-09-16 | 2026-09-16 | Directors or officers departed or appointed | filing |
| 2026-09-11 | 2026-09-10 | Charter or bylaws amended | filing |
| 2026-08-26 | 2026-08-24 | Charter or bylaws amended | filing |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 175 | $64.5M | 390,087,898 | 28 | 61 | 43 | 0.7% |
| Q1 2026 | 192 | $60.8M | 179,050,724 | 43 | 71 | 51 | 2.4% |
| Q4 2025 | 204 | $622.6M | 189,160,270 | 49 | 67 | 46 | 5.8% |
| Q3 2025 | 171 | $501.7M | 180,295,079 | 56 | 46 | 46 | 5.5% |
| Q2 2025 | 129 | $222.7M | 177,323,767 | 32 | 41 | 27 | 2.1% |
| Q1 2025 | 122 | $574.6M | 519,622,844 | 27 | 32 | 30 | 0.5% |
| Q4 2024 | 104 | $157.2M | 171,917,370 | 11 | 31 | 25 | 1.1% |
| Q3 2024 | 101 | $174.7M | 175,601,146 | 15 | 23 | 28 | 0.8% |
| Q2 2024 | 95 | $166.7M | 183,745,653 | 11 | 30 | 28 | 0.7% |
| Q1 2024 | 109 | $245.5M | 206,798,180 | 23 | 26 | 30 | 0.5% |
| Q4 2023 | 100 | $201.9M | 215,609,377 | 20 | 33 | 22 | 2.0% |
| Q3 2023 | 98 | $174.6M | 205,827,840 | 34 | 31 | 19 | 1.8% |
| Q2 2023 | 98 | $76.5M | 62,044,186 | 13 | 18 | 42 | 2.3% |
| Q1 2023 | 110 | $100.5M | 77,683,750 | 24 | 28 | 39 | 2.6% |
| Q4 2022 | 120 | $226.8M | 103,750,505 | 18 | 50 | 35 | 0.8% |
| Q3 2022 | 162 | $1.0B | 85,227,044 | 45 | 62 | 34 | 2.3% |
| Q2 2022 | 131 | $545.2M | 63,701,333 | 22 | 34 | 49 | 2.2% |
| Q1 2022 | 140 | $537.5M | 59,881,447 | 24 | 43 | 41 | 3.3% |
| Q4 2021 | 133 | $675.4M | 58,956,265 | 16 | 41 | 39 | 1.3% |
| Q3 2021 | 127 | $698.5M | 54,748,478 | 23 | 32 | 32 | 1.5% |
| Q2 2021 | 115 | $434.6M | 53,089,156 | 17 | 32 | 35 | 0.8% |
| Q1 2021 | 124 | $509.5M | 54,257,159 | 19 | 32 | 41 | 1.5% |
| Q4 2020 | 121 | $525.7M | 53,418,714 | 20 | 47 | 29 | 1.7% |
| Q3 2020 | 123 | $697.7M | 55,539,544 | 21 | 48 | 29 | 1.2% |
| Q2 2020 | 111 | $686.3M | 52,506,942 | 28 | 58 | 14 | 0.4% |
| Q1 2020 | 96 | $415.2M | 40,434,037 | 18 | 25 | 29 | 1.1% |
| Q4 2019 | 94 | $657.9M | 40,942,996 | 21 | 30 | 20 | 2.7% |
| Q3 2019 | 84 | $729.5M | 41,339,705 | 21 | 41 | 14 | 4.9% |
| Q2 2019 | 74 | $812.8M | 36,689,376 | 16 | 25 | 19 | 0.0% |
| Q1 2019 | 71 | $776.3M | 35,897,641 | 71 | 0 | 0 | 0.0% |