| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Octagon Capital Advisors LP | 8.6% | $17,226,928 | 19,576,054 | Octagon Capital Advisors LP | 31 Dec 2024 | |||
| 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 30 Sep 2025, 161 institutional investors reported holding 180,099,073 shares of Gossamer Bio, Inc. - Common Stock (GOSS). This represents 78% of the company’s total 231,780,123 outstanding shares.
The largest institutional shareholders of Gossamer Bio, Inc. - Common Stock (GOSS) together control 63% 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% | 2.6% | $47,584,679 |
| Octagon Capital Advisors LP | 7.4% | 17,050,000 | -7.1% | 7% | $44,841,500 |
| BlackRock, Inc. | 6% | 13,846,054 | +14% | 0% | $36,415,120 |
| VANGUARD GROUP INC | 5.2% | 12,009,773 | +5.2% | 0% | $31,585,704 |
| ARCH Venture Management, LLC | 3.5% | 8,055,916 | 0% | 4.3% | $21,187,059 |
| SAMSARA BIOCAPITAL, LLC | 2.6% | 6,130,268 | 0% | 2.1% | $16,122,605 |
| Palo Alto Investors LP | 2.4% | 5,464,349 | -4.8% | 2.7% | $14,371,238 |
| Siren, L.L.C. | 2.2% | 5,208,968 | 0% | 0.54% | $13,699,586 |
| 683 Capital Management, LLC | 2.2% | 5,059,200 | -20% | 1.2% | $13,305,696 |
| ACADIAN ASSET MANAGEMENT LLC | 2.2% | 5,012,969 | -30% | 0.02% | $13,181,000 |
| HHLR ADVISORS, LTD. | 2.1% | 4,974,041 | 0% | 0.32% | $13,081,728 |
| SILVERARC CAPITAL MANAGEMENT, LLC | 2.1% | 4,779,082 | -7.1% | 1.8% | $12,568,986 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 4,689,531 | +3% | 0% | $12,335,807 |
| FMR LLC | 1.8% | 4,085,346 | -44% | 0% | $10,744,459 |
| STATE STREET CORP | 1.7% | 3,883,667 | +57% | 0% | $10,214,044 |
| PERCEPTIVE ADVISORS LLC | 1.6% | 3,812,797 | 0.29% | $10,027,656 | |
| MILLENNIUM MANAGEMENT LLC | 1.6% | 3,619,329 | +629% | 0.01% | $9,518,835 |
| Rock Springs Capital Management LP | 1.4% | 3,266,960 | 0% | 0.5% | $8,592,105 |
| RENAISSANCE TECHNOLOGIES LLC | 1.3% | 2,980,188 | +9.1% | 0.01% | $7,837,894 |
| BANK OF AMERICA CORP /DE/ | 1.2% | 2,881,904 | +4196% | 0% | $7,579,408 |
| UBS Group AG | 1.2% | 2,770,046 | +786% | 0% | $7,285,221 |
| Opaleye Management Inc. | 1.2% | 2,725,000 | -23% | 1% | $7,166,750 |
| TWO SIGMA INVESTMENTS, LP | 0.99% | 2,287,251 | +31% | 0.01% | $6,015,470 |
| CITADEL ADVISORS LLC | 0.99% | 2,284,216 | +198% | 0% | $6,007,488 |
| Alyeska Investment Group, L.P. | 0.82% | 1,909,087 | -57% | 0.02% | $5,020,899 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 799,497 | $2,459,500 | +$2,224,703 | $3.10 | 10 |
| 2025 Q3 | 180,099,073 | $473,650,324 | +$14,481,579 | $2.63 | 161 |
| 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 |