| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Octagon Capital Advisors LP | 6.5% | -23% | $46,938,418 | -$13,747,350 | 15,141,425 | -23% | Octagon Capital Advisors LP | 31 Dec 2025 |
| BlackRock, Inc. | 6.5% | +24% | $46,705,201 | +$9,084,437 | 15,065,708 | +24% | BlackRock, Inc. | 31 Dec 2025 |
| VANGUARD GROUP INC | 5% | +15% | $14,035,274 | +$1,693,271 | 11,410,792 | +14% | The Vanguard Group | 30 Jun 2025 |
| Invus Global Management, LLC | 2.8% | $5,507,814 | 6,258,880 | Invus Public Equities, L.P. | 31 Dec 2024 |
As of 31 Dec 2025, 191 institutional investors reported holding 180,653,789 shares of Gossamer Bio, Inc. - Common Stock, $0.0001 par value (GOSS). This represents 78% of the company’s total 232,945,000 outstanding shares.
The largest institutional shareholders of Gossamer Bio, Inc. - Common Stock, $0.0001 par value (GOSS) together control 64% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| NEA Management Company, LLC | 7.8% | 18,093,034 | 0% | 2.9% | $56,088,405 |
| BlackRock, Inc. | 7.3% | 17,056,878 | +23% | 0% | $52,876,322 |
| Octagon Capital Advisors LP | 6% | 13,915,371 | -18% | 5.4% | $43,137,650 |
| VANGUARD GROUP INC | 5.5% | 12,873,209 | +7.2% | 0% | $39,906,948 |
| STATE STREET CORP | 4% | 9,310,969 | +140% | 0% | $28,864,004 |
| ARCH Venture Management, LLC | 3.5% | 8,055,916 | 0% | 3.8% | $24,973,340 |
| SAMSARA BIOCAPITAL, LLC | 3.1% | 7,222,559 | +18% | 2.3% | $22,389,933 |
| Siren, L.L.C. | 2.2% | 5,208,968 | 0% | 0.48% | $16,147,801 |
| 683 Capital Management, LLC | 2.2% | 5,190,800 | +2.6% | 1.3% | $16,091,480 |
| HHLR ADVISORS, LTD. | 2.1% | 4,974,041 | 0% | 0.5% | $15,419,527 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 4,872,714 | +3.9% | 0% | $15,109,345 |
| Palo Alto Investors LP | 1.9% | 4,471,592 | -18% | 1.9% | $13,861,935 |
| ACADIAN ASSET MANAGEMENT LLC | 1.9% | 4,416,903 | -12% | 0.02% | $13,687,000 |
| FMR LLC | 1.8% | 4,237,590 | +3.7% | 0% | $13,136,529 |
| MILLENNIUM MANAGEMENT LLC | 1.5% | 3,584,288 | -0.97% | 0.01% | $11,111,293 |
| TWO SIGMA INVESTMENTS, LP | 1.5% | 3,397,110 | +49% | 0.02% | $10,531,041 |
| Rock Springs Capital Management LP | 1.4% | 3,266,960 | 0% | 0.52% | $10,127,576 |
| PERCEPTIVE ADVISORS LLC | 1.3% | 3,139,669 | -18% | 0.18% | $9,732,974 |
| Opaleye Management Inc. | 1.2% | 2,720,000 | -0.18% | 1.1% | $8,432,000 |
| TWO SIGMA ADVISERS, LP | 1.1% | 2,596,900 | +39% | 0.02% | $8,050,390 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 0.93% | 2,178,033 | +55% | 0.03% | $6,751,902 |
| SILVERARC CAPITAL MANAGEMENT, LLC | 0.92% | 2,135,722 | -55% | 0.96% | $6,620,738 |
| BANK OF AMERICA CORP /DE/ | 0.82% | 1,906,669 | -34% | 0% | $5,910,674 |
| GOLDMAN SACHS GROUP INC | 0.77% | 1,792,114 | +498% | 0% | $5,555,554 |
| UBS Group AG | 0.76% | 1,771,381 | -36% | 0% | $5,491,281 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 180,653,789 | $559,988,381 | +$5,504,913 | $3.10 | 191 |
| 2025 Q3 | 180,099,232 | $473,650,742 | +$14,481,997 | $2.63 | 162 |
| 2025 Q2 | 177,241,575 | $218,003,209 | +$9,779,866 | $1.23 | 123 |
| 2025 Q1 | 169,972,743 | $186,887,807 | -$1,268,144 | $1.10 | 118 |
| 2024 Q4 | 171,313,829 | $154,975,691 | -$4,643,111 | $0.90 | 102 |
| 2024 Q3 | 174,874,615 | $172,644,460 | -$19,949,532 | $0.99 | 99 |
| 2024 Q2 | 182,850,284 | $164,736,451 | -$20,026,799 | $0.90 | 93 |
| 2024 Q1 | 197,765,806 | $233,516,476 | -$11,193,563 | $1.18 | 105 |
| 2023 Q4 | 203,270,485 | $185,471,165 | +$4,883,709 | $0.91 | 96 |
| 2023 Q3 | 205,596,440 | $171,215,346 | +$117,834,337 | $0.83 | 93 |
| 2023 Q2 | 62,010,889 | $74,414,154 | -$19,164,753 | $1.20 | 94 |
| 2023 Q1 | 77,679,537 | $97,875,805 | -$40,109,226 | $1.26 | 107 |
| 2022 Q4 | 103,773,723 | $225,185,263 | -$165,052,760 | $2.17 | 117 |
| 2022 Q3 | 85,232,624 | $1,021,045,667 | +$262,239,455 | $11.98 | 154 |
| 2022 Q2 | 63,691,207 | $533,207,849 | +$32,485,845 | $8.37 | 126 |
| 2022 Q1 | 59,875,031 | $519,727,258 | +$5,179,881 | $8.68 | 138 |
| 2021 Q4 | 58,810,100 | $664,847,746 | +$43,218,257 | $11.31 | 129 |
| 2021 Q3 | 54,748,025 | $687,740,924 | +$24,001,097 | $12.57 | 123 |
| 2021 Q2 | 53,088,201 | $431,075,177 | -$10,198,257 | $8.12 | 109 |
| 2021 Q1 | 54,256,286 | $501,857,885 | +$8,880,956 | $9.25 | 121 |
| 2020 Q4 | 53,109,159 | $513,580,534 | -$47,148,476 | $9.67 | 119 |
| 2020 Q3 | 55,543,085 | $689,284,591 | +$37,297,727 | $12.41 | 122 |
| 2020 Q2 | 52,506,803 | $683,821,623 | +$177,437,307 | $13.00 | 108 |
| 2020 Q1 | 39,039,096 | $396,249,329 | -$15,719,655 | $10.15 | 95 |
| 2019 Q4 | 40,415,352 | $631,689,853 | -$16,734,787 | $15.63 | 86 |
| 2019 Q3 | 41,336,618 | $693,682,039 | +$153,760,437 | $16.79 | 78 |
| 2019 Q2 | 36,689,307 | $812,845,961 | +$18,784,299 | $22.18 | 74 |
| 2019 Q1 | 35,897,641 | $776,340,000 | +$776,340,189 | $21.67 | 71 |